Organization
Faculty of Chemistry, Materials and Bioengineering Professor
Title
Professor
Contact information
External link
TAKENAKA,Toshihide
Degree
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工学博士 ( 1986.9 )
Research Areas
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Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Manufacturing and production engineering
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Nanotechnology/Materials / Metallic material properties
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Nanotechnology/Materials / Metals production and resources production
Education
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Kyoto University Graduate School, Division of Engineering
1986
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Kyoto University Faculty of Engineering
- 1981
Country： Japan
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Kyoto University Graduate School, Division of Engineering
1986
Country： Japan
Professional Memberships
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軽金属学会
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溶融塩委員会
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資源素材学会
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電気化学会
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日本鉄鋼協会
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日本金属学会
Committee Memberships
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監事
Papers
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The influence of introduced strains on the exfoliation corrosion behavior of Mg-14mass%Li-1mass%Al alloy
Hayato Ikoma, Taiki Morishige, Toshihide Takenaka
Materials Science Forum 1016 587 - 591 2021
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Effect of Cation Species in the Electrolyte on the Oxidized Film on the Anodizing of Mg–Li–Al Alloys
Yuka Ichigi, Taiki Morishige, Toshihide Takenaka
Minerals, Metals and Materials Series 179 - 187 2021
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Extra-hardening of SPD-processed Al-Mg alloy with minimum grain sizes
Taiki Morishige, Yuto Suzuki, Toshihide Takenaka
Materials Science Forum 1016 952 - 956 2021
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Oxide Films Formed on MoSi2 Anode in Molten MgCl2–NaCl–CaCl2 and Molten LiCl–KCl
Takamasa Miyoshi, Taiki Morishige, Toshihide Takenaka
Minerals, Metals and Materials Series 19 - 25 2021
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Effects of MgCl2 and NaCl on Si-Thermic Reduction of MgO in Recycle of Mg-air Battery
Atsushi Hayashida, Toshihide Takenaka, Taiki Morishige
Minerals, Metals and Materials Series 267 - 273 2021
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Effect of Pre-sintering in Silicothermic Reduction of MgO and Reduction Using Ca2SiO4 Instead of CaO
Takeru Saimura, Taiki Morishige, Toshihide Takenaka
Minerals, Metals and Materials Series 13 - 17 2021
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Effect of Microstructure on Corrosion Behavior of Cold-Rolled Mg–Li–Al Alloy
Taiki Morishige, Hayato Ikoma, Toshihide Takenaka
Minerals, Metals and Materials Series 189 - 193 2021
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Anodic behavior of MoSi2 in molten MgCl2-NaCl-CaCl2 containing oxide ions
Takamasa Miyoshi, Taiki Morishige, Toshihide Takenaka
ECS Transactions 98 ( 10 ) 253 - 260 2020
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Al electrodeposition in molten CaCl2 with various calcium aluminates
Yuta Iwai, Taiki Morishige, Toshihide Takenaka
ECS Transactions 98 ( 10 ) 333 - 340 2020
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Dependence of reduction behavior of Ti in molten CaCl2 on various calcium titanate
Haruka Okada, Kakeru Shimokawa, Taiki Morishige, Toshihide Takenaka
Materials Transactions 59 ( 4 ) 690 - 693 2018
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Electrodeposition of Si in molten CaCl2 above 1300K
Toshihide Takenaka, Ryoya Shimokawa, Haruka Okada, Taiki Morishige
ECS Transactions 86(14), pp.29-35 2018
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Influence of molar ratio of CaO to TiO2 on Ti electrodeposition in molten CaCl2
Haruka Okada, Maito Murata, Taiki Morishige, Toshihide Takenaka
ECS Transactions 86(14), pp.117-122 2018
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Unique Metal Fog Generation in LiCl-KCl Melt
Toshihide Takenaka, Shogo Akimura, Taiki Morishige
Electrochemistry 86(4), pp.179-183 2018
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Relationship between microstructure and exfoliation corrosion in mg-14mass%li-3mass%al cold-rolled alloy
Yuki Sekiguchi, Taiki Morishige, Takayuki Goto, Eiji Nakamura, Toshihide Takenaka
Materials Science Forum 941 1743 - 1747 2018
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Effect of voltage on mg-li-al alloy anodic oxide film
Naoya Miyakita, Natsuki Tanigaki, Taiki Morishige, Toshihide Takenaka
Materials Science Forum 941 1194 - 1197 2018
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The relationship between mg content and extra-hardening in ultrafine grained al-mg alloy by spd
Yuto Suzuki, Yuichi Shiono, Taiki Morishige, Toshihide Takenaka
Materials Science Forum 941 1173 - 1177 2018
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The effect of vibration condition for magnesium dry gravity sorting by vibrating particulate bed
Shingo Itoh, Keigo Tsujita, Taiki Morishige, Toshihide Takenaka
Materials Science Forum 941 1535 - 1539 2018
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Effect of Zn existence on Mg corrosion due to Cu
Hiroaki Ishimaru, Taiki Morishige, Toshihide Takenaka
ECS Transactions 75(26), pp.1-5 2017
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Dissolution of Calcium Titanate in Calcium Chloride Melt and Its Application to Titanium Electrolysis
Toshihide Takenaka, Kakeru Shimokawa, Kazuyoshi Nishikawa, Haruka Okada, Taiki Morishige
MATERIALS TRANSACTIONS 58 ( 3 ) 350 - 354 2017
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マグネシウム材料の乾式リサイクル法に関する基礎的研究
竹中俊英, 森重大樹
溶融塩および高温化学 59, pp.114-123 2016
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Effect of Al Composition on the Corrosion Resistance of Mg-14 mass% Li System Alloy
Taiki Morishige, Yutaro Obata, Takayuki Goto, Tomoki Fukagawa, Eiji Nakamura, Toshihide Takenaka
MATERIALS TRANSACTIONS 57 ( 10 ) 1853 - 1856 2016
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Influence of cathode potential on Ti electrodeposition in molten fluoride
Kazuyoshi Nishikawa, Sawada Humiya, Taiki Morishige, Toshihide Takenaka
MOLTEN SALTS AND IONIC LIQUIDS 20 75 ( 15 ) 199 - 206 2016
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Availability evaluation of SiC anode in chloride molten salt electrolysis
Yoshihiro Takahashi, Toshihide Takenaka
MOLTEN SALTS AND IONIC LIQUIDS 20 75 ( 15 ) 207 - 214 2016
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Effect of electrode shape on lithium metal fog in LiCl-KCl
Shogo Akimura, Taiki Morishige, Toshihide Takenaka
MOLTEN SALTS AND IONIC LIQUIDS 20 75 ( 15 ) 233 - 237 2016
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Magnesium Sorting by Vibrating Particulate Bed from Mixed Metal Scrap
Taiki Morishige, Keigo Tsujita, Soshiro Murasa, Toshihide Takenaka
MATERIALS TRANSACTIONS 56 ( 10 ) 146 - 148 2015.10
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Removal of Impurity Fe from Mg-3 mass% Al Alloy Melt by CO2 Injection
Taiki Morishige, Kazuchika Kurino, Toshihide Takenaka
MATERIALS TRANSACTIONS 56 ( 3 ) 454 - 456 2015
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Mg-Li合金の腐食挙動と防食法
竹中俊英, 森重大樹
めっき技術 28巻5号,15-20頁 2015
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マグネシウムリサイクルへの種々の乾式分離法の適用
竹中俊英, 森重大樹
環境資源工学 62, pp.123-127 2015
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Effect of Impurity Fe Concentration on the Corrosion Behavior of Mg-14 mass%Li-1 mass%Al Alloy
Taiki Morishige, Kumiko Ueno, Masahiro Okano, Takayuki Goto, Eiji Nakamura, Toshihide Takenaka
MATERIALS TRANSACTIONS 55 ( 9 ) 1506 - 1509 2014.9
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Ryoko Yoshida, Toru Maruyama, Hiroyuki Abe, Ryozo Matsubayashi, Masakazu Teramura, Takeshi Kobayashi, Toshihide Takenaka
Journal of Japan Foundry Engineering Society 86巻, 1号, 26-30頁 ( 1 ) 26 - 30 2014.1
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Electrochemical Behavior of Ti in Molten Fluoride-Oxide System
Y. Yamanaka, T. Morishige, T. Takenaka
MOLTEN SALTS AND IONIC LIQUIDS 19 64 ( 4 ) 275 - 283 2014
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Exfoliation Corrosion Behavior of Cold-Rolled Mg-14 mass% Li-1 mass% Al Alloy in NaCl Solution
Taiki Morishige, Hirokazu Doi, Takayuki Goto, Eiji Nakamura, Toshihide Takenaka
MATERIALS TRANSACTIONS 54 ( 9 ) 1863 - 1866 2013
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Fe elimination from Mg by carbide formation
Toshihide Takenaka, Ryunosuke Morikawa, Taiki Morishige
Materials Science and Technology Conference and Exhibition 2013, MS and T 2013 3 1550 - 1554 2013
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Ryoko Yoshida, Toru Maruyama, Hiroyuki Abe, Ryozo Matsubayashi, Masakazu Teramura, Takeshi Kobayashi, Toshihide Takenaka
Journal of Japan Foundry Engineering Society 84巻, 7号, 383-388頁 ( 7 ) 383 - 388 2012.7
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Electrodeposition of Ti in Molten Salt at High Temperature
Toshihide Takenaka, Hidetaka Matsuo, Masahiro Kawakami
TI-2011: PROCEEDINGS OF THE 12TH WORLD CONFERENCE ON TITANIUM, VOL I vol.1, pp.75-78 75 - 78 2012
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Anodic Reactions on Some Materials in LiCl-KCl Melt
T. Takenaka, M. Umehara, D. Araki, T. Morishige
MOLTEN SALTS AND IONIC LIQUIDS 18 50 ( 11 ) 127 - 134 2012
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Removal of Impurities in Steel by DC-ESR Operation Reviewed
Toshihide Takenaka, Masatoshi IIZUKA
J. Rare Earth vol.29(sp), pp.51-54 2011.12
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高温溶融塩化物中での電極反応 ～電気化学挙動と実現象～
竹中俊英
溶融塩および高温化学 vol.54(1), pp.5-11 2011
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Direct Production of Ti-Fe Alloy in Liquid by Electrowinning in Molten Slag
Toshihide Takenaka, Hidetaka Matsuo, Masahiro Kawakami
ISIJ INTERNATIONAL 51 ( 11 ) 1762 - 1765 2011
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Evaluation of joint interface of friction stir welding between dissimilar metals using HTS-SQUID gradiometer
Y. Mashiko, Y. Hatsukade, T. Yasui, H. Takenaka, Y. Todaka, M. Fukumoto, S. Tanaka
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 470 ( 20 ) 1524 - 1528 2010.11
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High Temperature Electrolysis of Ti and Its Alloys with a DC-ESR Unit
Toshihide Takenaka, Hidetaka Matsuo, Mitsuru Sugawara, Masahiro Kawakami
COST-AFFORDABLE TITANIUM III 436 85 - 91 2010
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Anodic Dissolution and Chemical Reduction of Noble Metals in LiCl-KCl Melt
Toshihide Takenaka, Keisuke Iwasa, Yoshifumi Hashigaya, Masanobu Izaki
ELECTROCHEMISTRY 77 ( 8 ) 633 - 635 2009.8
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チタン、チタン合金の直接電解製造～液体金属の電析は可能か？～
竹中俊英, 川上正博
溶融塩および高温化学 52巻3号,109-116頁 2009
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Influence of conversion coating conditions with rare earth elements on corrosion resistance of Mg alloys
Nobuo Uesaka, Yuichi Shikai, Toshihide Takenaka
ECS Transactions 16 ( 43 ) 39 - 46 2009
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Direct electrodeposition of Ti and Ti alloys in high temperature melt
Toshihide Takenaka, Hidetaka Matsuo, Mitsuru Sugawara, Akihiro Matsuyama, Masahiro Kawakami
pp.721-730 2009
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Desiliconization and Decarburization of Molten Pig Iron by Injection of Weakly Oxidizing Gas Reviewed
Toshihide Takenaka, Tatsuya Aihara, Masahiro Kawakami, Tomohiro Kojima
TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN 94 ( 11 ) 483 - 490 2008.11
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Improvement of corrosion resistance of magnesium alloys by surface film with rare earth element
Toshihide Takenaka, Yuji Narazaki, Nobuo Uesaka, Masahiro Kawakami
MATERIALS TRANSACTIONS 49 ( 5 ) 1071 - 1076 2008.5
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弱酸化成ガス吹き込みによる溶鉄の脱珪と脱炭 Reviewed
竹中俊英, 粟飯原達也, 川上正博, 小嶋智宏
鉄と鋼 94巻11号,23-30頁 2008
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Influence of some factors upon electrodeposition of liquid Li and Mg
Toshihide Takenaka, Kouji Shigeta, Hiroshi Masuhama, Kazushi Kubota
ECS Transactions 16 ( 49 ) 441 - 448 2008
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Influence of bath composition on Ti electrolysis in CaF2-CaO- TiO2 melt
Toshihide Takenaka, Mitsuru Sugawara, Hidetaka Matsuo, Akihiro Matsuyama, Masahiro Kawakami
ECS Transactions 16 ( 49 ) 221 - 228 2008
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Improvement of corrosion resistance of magnesium metal by rare earth elements
Toshihide Takenaka, Takami Ono, Yuji Narazaki, Yusuke Naka, Masahiro Kawakami
ELECTROCHIMICA ACTA 53 ( 1 ) 117 - 121 2007.11
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Anodic behaviors of noble metals in eutectic LiCl-KCl melt
Toshihide Takenaka, Masahiro Kawakami
ECS Transactions 3 ( 35 ) 385 - 393 2007
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Effect of Al2O3 content on tile electro-winning of Ti in DC-ESR operation
M. Kawakami, T. Takenaka, T. Kawabata, A. Matsuyama, S. Yokoyama
INNOVATIONS IN TITANIUM TECHNOLOGY pp.145-153 137 - + 2007
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Extraction of titanium in a liquid state from molten slag with a DC-ESR unit Reviewed
Akihiro Matsuyama, Takuya Kawabata, Mitsuru Sugawara, Toshihide Takenaka, Masahiro Kawakami
pp.177-180, 2007
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Titanium Coating on Steel by Disproportionation Reaction in Molten Salt Reviewed
Toshihide Takenaka, Masataka Muro, Masahiro Kawakami
pp.1683-1686 2007
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Development of New Titanium Production Process Reviewed
Masanori Yamaguchi, Yuichi Ono, Susumu Kosemura, Wataru Kagohashi, Toshihide Takenaka
pp.143-146 2007
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Coating of titanium alloy by using disproportionation reaction in molten chloride Reviewed
Masataka Muro, Shunsuke Miyazawa, Toshihide Takenaka, Masahiro Kawakami
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals 70 ( 2 ) 126 - 129 2006.2
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溶融塩化物中での不均化反応を用いたチタン合金コーティング Reviewed
室昌孝, 宮澤俊輔, 竹中俊英, 川上正博
日本金属学会誌 第70巻2号,126-129頁 2006
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Characterization of thermal annealing effects on the evolution of coke carbon structure using Raman spectroscopy and X-ray diffraction
Masahiro Kawakami, Haruki Kanba, Kazunori Sato, Toshihide Takenaka, Sushil Gupta, R. Chandratilleke, Veena Sahajwalla
ISIJ INTERNATIONAL 46 ( 8 ) 1165 - 1170 2006
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An attempt at direct ingot making of titanium by the electro-winning from molten slag with DC-ESR unit
M. Kawakami, T. Takenaka, M. Orisaka, T. Kawabata, A. Matsuyama, S. Yokoyama
SOHN INTERNATIONAL SYMPOSIUM ADVANCED PROCESSING OF METALS AND MATERIALS, VOL 7 vol.7, pp.373-381 373 - + 2006
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Catalytic effect of some inorganic materials on the gasification reaction of graphite and coke
M. Kawakami, T. Iwabuchi, Y. Takashima, H. Kanba, T. Takenaka, S. Yokoyama
SOHN INTERNATIONAL SYMPOSIUM ADVANCED PROCESSING OF METALS AND MATERIALS, VOL 2 vol.2, pp.155-162 155 - + 2006
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Effect of rare earth metals on corrosion resistance of MG metal
Toshihide Takenaka, Takami Ono, Yuji Narazaki, Masahiro Kawakami
SOHN INTERNATIONAL SYMPOSIUM ADVANCED PROCESSING OF METALS AND MATERIALS, VOL 7 vol.7, pp.509-516 509 - + 2006
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Electrochemical reduction of Ti ion in various molten salt systems
T Takenaka, M Kawakami
JOURNAL OF RARE EARTHS 23 21 - 25 2005.10
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Direct electrodeposition of Mg containing La in molten salt and its corrosion property
T Takenaka, Y Naka, N Narukawa, T Noichi, M Kawakami
ELECTROCHEMISTRY 73 ( 8 ) 706 - 709 2005.8
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Electro Winning of Titanium from Molten Salt with ESR Unit Reviewed
Masahiro Kawakami, Masayuki Orisaka, Takuya Noichi, Tatsuya Hashimoto, Toshihide Takenaka
pp.135-138 2005
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Structure analysis of coke, wood charcoal and bamboo charcoal by Raman spectroscopy and their reaction rate with CO2
M Kawakami, T Karato, T Takenaka
ISIJ INTERNATIONAL 45 ( 7 ) 1027 - 1034 2005
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Separation of Elements in Stainless Steel by Chemical and Electrochemical Methods Reviewed
Toshihide Takenaka, Masahiro Kawakami
vol.18(1), pp.39-47 2005
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Mechanism of simultaneous decarburization and nitrogen removal by blasting iron ore powder on to molten steel surface Reviewed
Masahiro Kawakami, Masuo Inouye, Jeong Sik Kim, Toshihide Takenaka, Seiji Yokoyama
Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan 90 ( 6 ) 414 - 421 2004
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Possibility of several steelmaking reactions by the injection of H 2 into molten steel Reviewed
Masahiro Kawakami, Takahiko Maeda, Toshihide Takenaka, Seiji Yokoyama
Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan 90 ( 6 ) 422 - 428 2004
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Micro pore structure and reaction rate of coke, wood charcoal and graphite with CO2
M Kawakami, H Taga, T Takenaka, S Yokoyama
ISIJ INTERNATIONAL 44 ( 12 ) 2018 - 2022 2004
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Dependence of titanium deposition upon its ionic state in molten salt
T Takenaka, M Kawakami, N Suda
DESIGNING, PROCESSING AND PROPERTIES OF ADVANCED ENGINEERING MATERIALS, PTS 1 AND 2 449-4 453 - 456 2004
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Direct Electrodeposition of Mg Including La in Molten Salt Reviewed
Toshihide Takenaka, Yusuke Naka, Nobuo Narukawa, Masahiro Kawakami
pp.679-785 2004
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Direct Electrowinning of Titanium: Combination of Electrolysis and Melting of Titanium Metal by DC ESR Apparatus Reviewed
Toshihide Takenaka, Masahiro Kawakami
vol.I, pp.221-228 2004
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Reaction Kinetics of Coke and Some Carbonaceous Materials with CO 2 and Coke Strength after Reaction
Masahiro Kawakami, Yukitaka Mizutani, Takayuki Ohyabu, Kengo Murayama, Tosihide Takenaka, Seiji Yokoyama
Steel Research International 75 ( 2 ) 93 - 98 2004
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Electrorefining of magnesium in molten salt and its application for recycling
T Takenaka, S Isazawa, M Mishina, Y Kamo, M Kawakami
MATERIALS TRANSACTIONS 44 ( 4 ) 546 - 551 2003.4
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Reaction rate of coke and other carbonaceous materials with CO2 Reviewed
Masahiro Kawakami, Takayuki Ohyabu, Yukitaka Mizutani, Toshihide Takenaka, Seiji Yokoyama
Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan 89 ( 5 ) 581 - 586 2003
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Reaction kinetics of some carbonaceous materials with oxidizing gas
M Kawakami, Y Mizutani, T Iwabuchi, T Takenaka, S Yokoyama
HIGH TEMPERATURE MATERIALS AND PROCESSES 22 ( 3-4 ) 171 - 178 2003
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Electrorefining of Mg in molten salt
T Takenaka, S Isazawa, Y Kamo, M Mishina, M Kawakami
MAGNESIUM ALLOYS 2003, PTS 1 AND 2 419-4 653 - 657 2003
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Preparation of Mg alloys by using molten salt
T Takenaka, Y Naka, T Noichi, M Kawakami
MAGNESIUM ALLOYS 2003, PTS 1 AND 2 419-4 677 - 681 2003
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Separation of elements in stainless steel by electrorefining process
T Takenaka, M Kawakami, M Kawaguchi
METALLURGICAL AND MATERIALS PROCESSING: PRINCIPLES AND TECHNOLOGIES vol.3, pp.409-415 409 - 415 2003
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Reaction kinetics of some carbonaceous materials with carbon dioxide
M Kawakami, T Ohyabu, T Takenaka, S Yokoyama
METALLURGICAL AND MATERIALS PROCESSING: PRINCIPLES AND TECHNOLOGIES, VOL 1 vol. I, pp.75-83 75 - 83 2003
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コークスおよび各種炭材のCO2によるガス化反応速度 Reviewed
川上正博, 大藪貴之, 水谷行隆, 竹中俊英, 横山誠二
鉄と鋼 89巻5号,85-90頁 2003
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Electrode reactions in dc electroslag remelting of steel rod
M Kawakami, T Takenaka, M Ishikawa
IRONMAKING & STEELMAKING 29 ( 4 ) 287 - 292 2002.8
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Electrorefining of magnesium in chloride melts
T Takenaka, S Isazawa, Y Naka, M Kawakami
MOLTEN SALTS XIII 2002 ( 19 ) 779 - 788 2002
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Recycling of Electric Arc Furnace Dust and Smelting Reduction of Chromite Ore with The aid of Powder Injection Technique to Molten Iron
Masahiro Kawakami, Seiji Yokoyama, Toshihide Takenaka
pp.155-168 2002
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Dissolution and deposition of impurities in Mg electrolysis
T Takenaka, T Fujita, S Isazawa, M Kawakami
MATERIALS TRANSACTIONS 42 ( 7 ) 1249 - 1253 2001.7
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コークスのCO2との反応速度と反応後の強度変化
川上正博, 村山賢悟, 柴田将寛, 竹中俊英, 横山誠二
溶融塩および高温化学 44巻1号,38-51頁 2001
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Electroplating of Al-Ti and Ti in room temperature melt
T Takenaka, M Kawakami
INTERNATIONAL JOURNAL OF MATERIALS & PRODUCT TECHNOLOGY SPM I(2), pp.500-505 500 - 505 2001
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Strength and Morphology Change of Coke after Reaction with CO2
Masahiro Kawakami, Kenji Murayama, Toshihide Takenaka, Seiji Yokoyama
pp.33-42 2001
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Purification of magnesium using molten salt
T Takenaka, T Fujita, R Uchida, M Kawakami
PROCEEDINGS OF THE 6TH INTERNATIONAL SYMPOSIUM ON MOLTEN SALT CHEMISTRY AND TECHNOLOGY pp.318-321 318 - 321 2001
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Simultaneous Decarburization and Nitrogen Removal of Molten Steel by Blasting of Ito Ore Powder on the Free Surface
Masahiro Kawakami, Seiji Yokoyama, Toshihide Takenaka, Masuo Inoue, J S. Kim
vol. 2, pp.555-563 2001
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コークスのCO2との反応速度と反応後の強度の評価 Reviewed
川上正博, 村山賢悟, 柴田将寛, 竹中俊英, 戸田裕之
鉄と鋼 87巻5号、252-258頁 2001
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Electrode reactions of borides of refractory metals in fluoroborate melt
T Takenaka, K Nagao, M Kawakami
MOLTEN SALTS XII, PROCEEDINGS 99 ( 41 ) 636 - 644 2000
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Electrochemical behavior of impurity elements in magnesium electrolysis
T Takenaka, T Fujita, M Kawakami
MAGNESIUM ALLOYS 2000 350-3 291 - 296 2000
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Electrowinning of titanium in fluoride melt by using hydrogen gas oxidation as anodic reaction
T Takenaka, N Murakami, T Matsui, M Kawakami
SECOND INTERNATIONAL CONFERENCE ON PROCESSING MATERIALS FOR PROPERTIES pp.803-806 803 - 806 2000
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Reaction rate of coke with CO2 and degradation of coke after reaction
M Kawakami, K Murayama, T Takenaka, S Yokoyama
SECOND INTERNATIONAL CONFERENCE ON PROCESSING MATERIALS FOR PROPERTIES pp.547-552 547 - 552 2000
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Electrode Reactions in DC-ESR Process of Steel Rod
Masahiro Kawakami, Toshihide Takenaka, Masahiro Ishikawa
\slags\pdf\380.pdf 2000
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チタン溶融塩電解採取法への新しい試み
竹中俊英, 川上正博
溶融塩および高温化学 43巻2号,149-159頁 2000
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Direct electrowinning of liquid titanium metal by using Direct Current Electro Slag Remelting Apparatus
T Takenaka, M Ishikawa, M Kawakami
MOLTEN SALTS XII, PROCEEDINGS 99 ( 41 ) 578 - 584 2000
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The new concept for electrowinning process of liquid titanium metal in molten salt
T Takenaka, T Suzuki, M Ishikawa, E Fukasawa, M Kawakami
ELECTROCHEMISTRY 67 ( 6 ) 661 - 668 1999.6
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Characterization of relieved non-metallic inclusions in stainless steel by image processing of micrographs
M Kawakami, T Nishimura, T Takenaka, S Yokoyama
ISIJ INTERNATIONAL 39 ( 2 ) 164 - 170 1999
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Electrode Behavior of Hydrogen in Alkali Halide Melts Reviewed
Toshihide Takenaka, Yukiyohi Mitani, Masahiro Kawakami
vol.5-6, pp.275-278 1998
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Nb3Cl8を添加したLiCl−KCl共晶溶融塩浴を用いたニオブの電解精製 Reviewed
周康根, 竹中俊英, 佐藤修彰, 徳田昌則
電気化学および工業物理化学 65巻,134-137頁 1997
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The Possibility of ElectroWinning of Liquid Titanium Using ESR Apparatus
Masahiro Kawakami, Masaki Ooishi, Toshihide Takenaka, Takayuki Suzuki
pp.477-482 1997
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LiCl−KCl共晶塩－塩化ニオブ（NbCl5及びNb3Cl8）系溶融塩の導電率測定 Reviewed
周康根, 竹中俊英, 佐藤修彰, 徳田昌則
電気化学および工業物理化学 65巻,242-244頁 1997
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Electrorefining of niobium in LiCl-KCl eutectic melt with Nb3Cl8
Kanggen Zhou, Toshihide Takenaka, Nobuaki Sato, Masanori Tokuda
Denki Kagaku 65 ( 2 ) 134 - 137 1997
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Electroplating of TiB2 in NaF-NaBF4 eutectic melt with titanium fluoride
T Yamamoto, T Takenaka, M Kawakami
MATERIALS TRANSACTIONS JIM 37 ( 3 ) 363 - 366 1996.3
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Tiフッ化物を添加した NaF−NaBF4 共晶溶融塩中でのTiB2電析反応 Reviewed
山本貴史, 竹中俊英, 川上正博
電気化学および工業物理化学 64巻,132-137頁 1996
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高力アルミニウム合金の剥離腐食の定量評価法 Reviewed
山本成規, 竹中俊英, 川上正博
日本金属学会誌 60巻12号,1187-1191頁 1996
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Quantitative estimation method of exfoliation corrosion of high strength aluminum alloys Reviewed
Shigenori Yamamoto, Masahiro Kawakami, Toshihide Takenaka
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals 60 ( 12 ) 1187 - 1191 1996
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Chloride pyrometallurgy of uranium ore, (II)
Tomihiro Taki, Shigetoshi Komoto, Keiichiro Otomura, Toshihide Takenaka, Nobuaki Sato, Takeo Fujino
Journal of Nuclear Science and Technology 33 ( 4 ) 327 - 332 1996
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Effect of Additives on Ti Electrorefining in Molten Chloride Reviewed
Toshihide Takenaka, Akihisa Sugimoto, Yukiyoshi Mitani, Masahiro Kawakami
pp.171-178 1996
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Chloride pyrometallurgy of uranium ore, (I) chlorination of phosphate ore using solid or gas chlorinating agent and carbon Reviewed
Tomihiro Taki, Shigetoshi Komoto, Keiichiro Otomura, Toshihide Takenaka, Nobuaki Sato, Takeo Fujino
Journal of Nuclear Science and Technology 32 ( 9 ) 880 - 888 1995
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水素ガス流通下における炭化カルシウムからの水素化カルシウムの製造 Reviewed
藤重昌生, 田部井康一, 井野一, 竹中俊英, 川上正博
日本金属学会誌 58巻3号, 284-290頁 1994
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ELECTROPLATING OF TI AND TI COMPOUND IN MOLTEN-SALTS
T TAKENAKA, T YAMAMOTO, M KAWAKAMI
FIRST INTERNATIONAL CONFERENCE ON PROCESSING MATERIALS FOR PROPERTIES pp.425-428 425 - 428 1993
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Electroplating of Al-Ti in AlCl3-BPC Melt at Room Temperature Reviewed
Toshihide Takenaka, Akihiro Hoshikawa, Masahiro Kawakami
pp.184-192 1993
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THERMODYNAMIC PROPERTIES AND PHASE-EQUILIBRIA OF THE POTASSIUM INDIUM SYSTEM BY ELECTROMOTIVE-FORCE MEASUREMENTS
T TAKENAKA, A PETRIC, ML SABOUNGI
JOURNAL OF PHYSICS-CONDENSED MATTER 3 ( 11 ) 1603 - 1612 1991.3
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溶融LiCl−KCl共晶塩中のニオブの電気化学的挙動 Reviewed
周康根, 竹中俊英, 佐藤修彰, 南條道夫
電気化学及び工業物理化学 59巻11号,981-989頁 1991
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LiCl−KCl−NbCl5三元系の状態図 Reviewed
周康根, 竹中俊英, 佐藤修彰, 南條道夫
資源と素材 107巻4号,227-230頁 1991
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溶融塩化リチウム－塩化カリウム中でのデューテライドイオンの電極反応 Reviewed
竹中俊英, 伊藤靖彦
電気化学及び工業物理化学 59巻9号,796-797頁 1991
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溶融塩化リチウム－塩化カリウム中でのハイドライドイオンの電極反応 Reviewed
竹中俊英, 伊藤靖彦
電気化学及び工業物理化学 59巻9号,759-765頁 1991
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硝酸マンガン六水和物融液中での電極反応 Reviewed
竹中俊英, 藤井秀司, 南條道夫
東北大学選鉱製錬研究所彙報 46巻2号,87-95頁 1990
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タンタルコンデンサスクラップの塩化処理 Reviewed
佐藤修彰, 竹中俊英, 韋悦周, 南條道夫
東北大学選鉱製錬研究所彙報 46巻2号,96-104頁 1990
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Taコンデンサスクラップからの脱Mn浸出反応 Reviewed
韋悦周, 佐藤修彰, 竹中俊英, 南條道夫
資源と素材 105巻2号, 181-187頁 1989
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RELATION BETWEEN POTENTIALS OF LI,K/LI+,K+ DYNAMIC REFERENCE ELECTRODE AND HF/H2 GAS ELECTRODE IN A MOLTEN LIF-KF SYSTEM
K EMA, Y ITO, T TAKENAKA, J OISHI
ELECTROCHIMICA ACTA 32 ( 10 ) 1537 - 1540 1987.10
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BEHAVIOR OF HF/H2 ELECTRODE IN A MOLTEN LIF-KF SYSTEM
K EMA, Y ITO, T TAKENAKA, J OISHI
JOURNAL OF THE ELECTROCHEMICAL SOCIETY 134 ( 8B ) C515 - C515 1987.8
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溶融アルカリハライド中での金電極の電気化学挙動 Reviewed
竹中俊英, 伊藤靖彦, 大石純
電気化学及び工業物理化学 53巻7号, 476-480頁 1985
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溶融フッ化物－水系の電気化学挙動 Reviewed
竹中俊英, 伊藤靖彦, 石川孝康, 大石純
電気化学及び工業物理化学 52巻11号, 758-762頁 1984
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THE ANODIC BEHAVIOR OF OXIDE ION AT GLASSY-CARBON ELECTRODE IN LIF-KF EUTECTIC MELT
Y ITO, T TAKENAKA, K EMA, J OISHI
DENKI KAGAKU 51 ( 11 ) 864 - 868 1983
Books
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電気化学便覧・第6版（電気化学会編）6.3.1溶融塩の電気化学プロセスへの応用，12.4.4溶融塩電解
竹中俊英, 上田幹人
丸善 2013.1
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チタンの新しい製造法をめざして
竹中俊英
チタン 2012
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レアメタル便覧（足立吟也監修）, 15.3 レアメタル化合物の融点と沸点
Toshihide Takenaka
丸善 2011
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新製錬法の動向～2008年末～
竹中俊英
チタン 2009
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最近の研究：Mg 材料の耐食性向上をめざした最近の研究 Reviewed
竹中俊英
マテリア 2007
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溶融塩電解によるニオブの精製技術 Reviewed
周康根, 竹中俊英, 南條道夫
東北大学選鉱製錬研究所彙報 1988
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金属核燃料の乾式再処理 Reviewed
竹中俊英, 南條道夫
東北大学選鉱製錬研究所彙報 1987
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都市鉱山の魔法のエネルギー源～核燃料のリサイクル～
竹中俊英
Boundary 1987
MISC
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<Original Paper>Separation of Zirconium from Caldasite via Chlorides
Nobuaki SATO, Kunio HIRASAWA, Toshihide TAKENAKA, Michio NANJO
Bulletin of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University 47 ( 1 ) 31 - 40 1991.12
Presentations
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マグネシウムの製錬・リサイクルの研究動向
竹中俊英
（日本マグネシウム協会平成25年度第4回技術講演会） 2014.1
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新しいチタン金属製造法をめざした動き
竹中俊英
（腐食防食学会関西支部特別講演会） 2014.1
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Fe Elimination From Mg By Carbide Formation
Toshihide Takenaka, Ryunosuke Morikawa, Taiki Morishige
Proceedings of Materials Science & Technology 2013 2013.10
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Composition of the metal fog in the Li electrowinning in LiCl-KCl eutectic melt
Soshiro Murasa, Toshiki Hata, Ryosuke Takayanagi, Taiki Morishige, Toshihide Takenaka
(8th International Symposium in Science and Technology) 2013.8
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Our Recent Researches on Mg recycling
Toshihide Takenaka, Asato Shimomura, Ryunosuke Morikawa, Taiki Morishige
(11th Japan/Korea International Symposium on Resource Recycling and Materials Science) 2013.6
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The inspection of the iron removal method from the magnesium dissolution by carbon addition
Ryunosuke Morikawa, Taiki Morishige, Taiki Morishige
(11th Japan/Korea International Symposium on Resource Recycling and Materials Science) 2013.6
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マグネシウム合金の腐食特性について
竹中俊英
産総研コンソーシアム名古屋工業技術協会 平成２４年度特別講演会「自動車関連技術講演会」 2013.1
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Diffusion of Cu to Ti in Magnesium Melt for Purification Process
Taiki Morishige, Yuki Konishi, Asato Shimomura, Toshihide Takenaka
Proceedings of The 8th Pacific Rim International Congress on Advanced Materials and Processing 2013
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Exfoliation Corrosion Behavior of cold-rolled Mg-Li-Al alloy sheet
Taiki Morishige, Takayuki Goto, Eiji Nakamura, Toshihide Takenaka
Proceedings of International Conference on Processing and Manufacturing of Advanced Materials (THERMEC' 2013) 2013
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Conditions for Electrowinning of Liquid Ti Metal
Toshihide Takenaka, Taiki Morishige
4th Asian Conf. on Molten Salt Chem. and Tech. 2012.9
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Anodic Behavior of Ti Electrode in Eutectic LiCl-KCl Melt
Daichi Araki, Taiki Morishige, Toshihide Takenaka
4th Asian Conf. on Molten Salt Chem. and Tech. 2012.9
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Anodic Reaction on Carbon Materials in LiCl-KCl Melt
Masaki Umehara, Taiki Morishige, Toshihide Takenaka
4th Asian Conf. on Molten Salt Chem. and Tech. 2012.9
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Condition of Metal Fog Formation in LiCl-KCl Melt and Its Prevention by Li2O Addition
Ryosuke Takayanagi, Taiki Morishige, Toshihide Takenaka
4th Asian Conf. on Molten Salt Chem. and Tech. 2012.9
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Removals of Fe in Mg melt by graphite and Ca addition
Yuki Konishi, Taiki Morishige, Toshihide Takenaka
7th International Symposium in Science and Technology 2012.8
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Evaluation for metal based anode in LiCl-KCl molten salt electrolysis
Taiki Morishige, Daichi Araki, Masaki Umehara, Toshihide Takenaka
7th International Symposium in Science and Technology 2012.8
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Investigation of corrosion behavior in cold-rolled Mg-14wt.%Li-1wt.%Al alloy in NaCl solution
Hirokazu Doi, Taiki Morishige, Takayuki Goto, Eiji Nakamura, Toshihide Takenaka
7th International Symposium in Science and Technology 2012.8
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マグネシウム金属からの不純物除去～マグネシウム材料の実用的リサイクル法の検討～
竹中俊英
大阪ベイエリア金属系新素材コンソーシアム第１回セミナー 2011.12
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溶融塩中での電極反応のその場観察技術
竹中俊英
第42回溶融塩化学講習会 2011.12
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チタンの新しい製造法をめざして
竹中俊英
日本チタン協会平成23年度表彰式・記念講演会 2011.11
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高温溶融塩化物中での電極反応～電気化学挙動と実現象～
竹中俊英
第104回黒鉛化合物研究会 2011.10
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Electrochemical Behavior of Ti in Molten TiO2-CaO-CaF2-MgF2
Toshihide Takenaka, Taiki Morishige, Hidetaka Matsuo, Masahiro Kawakami
2011.9
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Corrosion Behavior of Cold-Rolled Mg-14 wt. %Li-1 wt. %Al Alloy in NaCl Solution
Hirokazu Doi, Taiki Morishige, Toshihide Takenaka, Takayuki Goto, Eiji Nakamura
2011.9
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Explanation of Anodic Behaviors in LiCl-KCl Melt by Electrochemical Response and in Situ Observation
Masaki Umehara, Taiki Morishige, Toshihide Takenaka
2011.9
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マグネシウム, チタンの溶融塩電解と炭素劣化
竹中俊英
炭素材料学会先端科学技術講習会2011 2011.6
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Cathodic Phenomena in Li Electrolysis in LiCl-KCl Melt
Toshihide Takenaka, Taiki Morishige, Masaki Umehara
2011.6
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溶融塩電解プロセスのin-situ計測
竹中俊英
第59回マテリアルズ・テーラリング研究会 2011.4
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Molten salt electrolysis of liquid metals -in-situ observation linked with electrochemical measurements-
Toshihide Takenaka
2011.3
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Tiの連続的な製造を目指して～JTS法の上工程の概要～
竹中俊英
日本鉄鋼協会チタンフォーラム第1回研究発表会 2010.12
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Ti新製錬法に関する最近の研究
竹中俊英
材料化学研究会平成22年度第２回講演会・見学会 2010.11
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高温イオン融体（溶融塩）中での電極反応～電気化学応答と実現象の関連～
竹中俊英
界面現象研究センター第12回研究講演会 2010.11
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チタン素材製造の刷新をめざして
竹中俊英
平成22年度合同研究部門別発表会 2010.11
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マグネシウムの精錬（リサイクル関係）の現状報告
竹中俊英
超塑性加工ものづくり研究会第57回勉強会 2010.7
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チタン・チタン合金の直接電解製造の試み
竹中俊英, 松尾英崇, 川上正博
第2回機能性チタン合金研究会講演会 2009.11
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ﾘｻｲｸﾙを考慮したﾏｸﾞﾈｼｳﾑの材料・ﾌﾟﾛｾｽ開発
竹中俊英
循環ビジネス創出会議 2009.11
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環境負荷を考慮したマグネシウム材料の表面処理法
竹中俊英
東海iNET新技術説明会 2009.10
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Corrosion Analysis of Magnesium Alloys with High Corrosion-Resistance
Ilhamdi, T. Takenaka, M. Izaki, J. Sasano
2009.9
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Preparation of 1.45-eV-Bandgap CuO Thin-films by Solution Electrochemical Reaction
K. Toyoda, J. Sasano, T. Takenaka, M. Izaki, M. Inoue
2008.10
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Characterization of Cu Oxide Layers Prepared by Chemical Bath Deposition (CBD)
Y. Yamane, J. Sasano, T. Takenaka, M. Izaki
2008.10
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マグネシウム材料の耐食性向上をめざした最近の研究
竹中俊英
平成２０年度第２回素材専門委員会 2008.9
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チタンの新製錬法 ～高温電解や気相還元～
竹中俊英
日本金属学会2008年秋季大会 2008.9
-
チタン新製錬法
竹中俊英
チタン合金の研究・開発最前線 2008.8
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Ti金属素材製造の現状と動向
竹中俊英
第１回チタン元素戦略研究会 2008.3
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Ti素材製造の現状とDC-ESR装置を用いた研究事例
竹中俊英, 川上正博
「体心立方系チタン合金の新しい展開」研究会 2007.3
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Resent researches on Ti processing in molten salt
Toshihide TAKENAKA
2006.3
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Reaction Rate and Structure Analysis of Some Carbonaceous Materials
Masahiro Kawakami, Tosihide Takenaka
2006
-
Coating of Ti and Ti Alloys by Disproportionation Reaction in Molten Salt
Toshihide Takenaka, Shunsuke Miyazawa, Masataka Muro, Masahiro Kawakami
2005
-
Difference in electrochemical reduction of Ti ion in various molten salt systems
Toshihide Takenaka, Masahiro Kawakami
2005
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Coating of Ti alloys by Disproportionation reaction in molten salt
Masataka Muro, Shunsuke Miyazawa, Toshihide Takenaka, Masahiro Kawakami
2005
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Dependence of DC ESR operation upon TiO2 concentration in molten fluoride oxide mixture
Takuya Hashimoto, Takuya Noichi, Masayuki Orisaka, Takahiro Kawabata, Hiroaki Tanigawa, Toshihide Takenaka, Masahiro Kawakami
2005
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Reaction Rate of Various Carbonaceous Materials with CO2 and Structure Evaluation of Them
Masahiro Kawakami, Takahiro Karato, Hiromitu Taga, Toshihide Takenaka, Seiji Yokoyama
2003
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Reaction Rate of Several Carbonaceous Materials with CO2
Masahiro Kawakami, Takayuki Ohyabu, Yukitaka Mizutani, Toshihide Takenaka, Seiji Yokoyama
2003
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Electrorefining of Mg in molten salt
ToshihideTakenaka, Satoshi Isazawa, Yusuke Naka, Masahiro Kawakami
2001
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Behavior of Impurities in Mg Metal in Molten Salt Treatment
ToshihideTakenaka, Satoshi Isazawa, Yusuke Naka
2000
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Behavior of Electrodeposition of Al-Ti Alloy in the Room Temperature Molten Salt
Kazuo Yoneda, Toshihide Takenaka, Masahiro Kawakami
1996
-
Electrode Reaction of Niobium in Molten Chlorides
Kang-gen Zhou, Toshihide Takenaka, Michio Nanjo
1988
Awards
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平成30年度（第22回）功績賞
2019.6 一般社団法人日本マグネシウム協会
-
平成23年度技術賞
2011.11 社団法人日本チタン協会
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2011年度溶融塩賞
2011.1 電気化学会溶融塩委員会
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日本鉄鋼協会学術記念賞（西山記念賞）
2005.3 日本鉄鋼協会
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第13回永井学術賞
1998.3 永井科学技術財団
Research Projects
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Innovative process for efficient Si production by molten salt electrolysis at ultrahigh temperature
Grant number：23K04463 2023.4 - 2026.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）
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Innovative production process of Ti and Si by electrolysis in molten CaCl2 at high temperature
Grant number：18H01763 2018.4 - 2022.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Takenaka Toshihide
Grant amount：\17160000 （ Direct Cost: \13200000 、 Indirect Cost：\3960000 ）
Electrolytic production of Ti metal and Si metal in molten CaCl2 with their oxides was investigated in this study.
TiO2 dissolved in molten CaCl2 with CaO, and Ti metal electrodeposited. The molar ratio of CaO to TiO2 strongly affected the Ti metal deposition. Ti metal was obtained only in the bath where CaO:TiO2 = 3:2., but the obtained Ti was a little even under this condition. It was suggested that the so-called shuttle reaction hindered the Ti deposition.Calcium silicate dissolved in molten CaCl2, and Si metal was obtained. The influence of the molar ratio of CaO to SiO2 on the Si deposition was seen, but Si metal electrodeposited effectively under the suitable condition. -
Progressive research on innert anode for Li and Mg electrolysis in molten chloride
Grant number：26289282 2014.4 - 2017.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Takenaka Toshihide
Grant amount：\16250000 （ Direct Cost: \12500000 、 Indirect Cost：\3750000 ）
Innovative material of inert anode for Li and Mg electrolysis in molten chloride containing oxide ions of impurity-level was studied. The anodic dissolution of carbon/graphite was hardly prevented, and nickel ferrite was dissolved by immersion. A TiO2 layer was not formed on Mo-Ti or Mo-Ti-Ru alloy, and their dissolution was rarely inhibited. The anodic behaviors of SiC strongly depended on the existence of oxide ions in melt, and a SiO2 layer was formed on its surface by electrolysis. The formed SiO2 seemed stable even under Cl2 gas generation, and its anodic dissolution was considerably lessened. The anodic behavior of MoSi2 resembled that of SiC. These results indicate that SiC and MoSi2 are potential as inert anode material in molten chloride containing oxide ions. The formation of a homogeneous and coherent SiO2 layer with better electric conductivity should be studied to apply them as a practical inert anode.
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Fundamental Study on the Establishment of Innovative System on Hydrogen Storage and Transportation using Lithium Hydride.
Grant number：21246113 2009 - 2011
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
SATO Yuzuru, TAKEDA Osamu, TAKENAKA Toshihide, YAMAGUCHI Katsunori, UEDA Mikito
Grant amount：\48880000 （ Direct Cost: \37600000 、 Indirect Cost：\11280000 ）
Hydrogen energy is widely developed recently from the viewpoint of efficient energy utilization and the environmental conservation such as a fuel cell technology. However, efficient methods for the storage and transportation are not yet established due the lower density and extremely low boiling temperature of hydrogen. Therefore, authors made an offer new method for the storage and transportation using lithium hydride, LiH at room temperature. Metallic lithium is let to react with hydrogen to form lithium hydride and is transported to the place on demand. The hydrogen is generated by reacting of LiH with water vapor. Then, LiOH is generated as a by-product of the reaction and must be returned to produce metallic lithium for establishing the whole cycle of hydrogen utilization using LiH. In this study, lithium production from LiOH through the molten salt electrolysis was successfully developed, and the mechanism of the reaction of metallic lithium with hydro- gen was made clear.
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Novel Process of Practical Impurity Removal from Magnesium Scrap
Grant number：21560770 2009 - 2011
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
TAKENAKA Toshihide, MORISHIGE Taiki
Grant amount：\4810000 （ Direct Cost: \3700000 、 Indirect Cost：\1110000 ）
Aiming at the development of the practical recycle process of Mg materials, the removal of Fe and Cu, which seriously deteriorate the properties of Mg materials and are easily contaminated in recycle process, has been investigated. Fe which has a stronger affinity with carbon than Mg was eliminated by simply adding a carbon source and additives in Mg melt. It was also found that Cu could be absorbed to Ti metal immersed in Mg melt.
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Improvement of corrosion resistance of Mg by rare earth elements〜Development of low nvironmental-burden material and investigation into mechanism
Grant number：18560714 2006 - 2007
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
TAKENAKA Toshihide, KAWAKAMI Masahiro
Grant amount：\3780000 （ Direct Cost: \3300000 、 Indirect Cost：\480000 ）
Surface oxide film containing rare earth elements(REs)was formed on Mg materials by chemical conversion and anodization to improve their corrosion resistance. Analysis of the film was carried out and the corrosion resistance against salt water was examined. Co-deposition of REs with magnesium metal in molten salt electrolysis was also studied in this study, and the influence of REs on the electrolysis efficiency was discussed.
The corrosion resistance of common magnesium alloys, such as AZ31, AZ61, AZ91 and AM60, was particularly improved by chemical conversion coating in solution containing both magnesium nitrate and RE nitrates, and the suitable coating condition for each alloy was clarified. The results from XRD, EPMA and XPS analyses indicated that the surface film consisted of complex oxides of magnesium and RE, and that the improvement of the corrosion resistance was affected by the distribution of the elements in the film.
Oxide film was formed on Mg alloy by anodization in solution containing RE nitrate. The corrosion resistance was bettered consequently, but particular results by the treatment with both magnesium and REs was hardly seen.
Magnesium metal containing REs was directly electrodeposited in a molten MgCl_2-NaCl-CaCl_2 bath with RECl_3.The morphology of the deposit strongly depended on the co-deposition of RE, and the electrochemical responses were remarkably changed. These results suggested a possibility that the electrolysis efficiency of magnesium deposition was improved by the co-deposition of REs -
Direct Ingot Making of Titanium by Electro-winning from Molten Salt, Using Metal Pool of Titanium
Grant number：15206084 2003 - 2005
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
KAWAKAMI Masahiro, TAKENAKA Toshihide
Grant amount：\48100000 （ Direct Cost: \37000000 、 Indirect Cost：\11100000 ）
The purpose of the present research project is to develop the direct ingot making process of titanium by electro-winning of titanium, where the metal pool of titanium is used as the cathode. By using ESR unit, the thermo-analysis of process, electrode reaction mechanism and contamination mechanism were examined.
At first, the electrical conductivity of CaO-CaF_2-TiO_2 slag was measured. The effect of TiO_2 addition was so small that the electronic conduction could be neglected. Thus, the addition of TiO_2 to the slag was possible at relatively large amount.
By operating ESR unit with steel rod, the relation between shape of metal pool and current-voltage condition was clarified. In the case of ESR, the metal pool could not be obtained at far higher temperature than the melting point of pure titanium. It was seen that the melting point of titanium rose by the absorption of oxygen. Thus, the atmosphere of the whole apparatus, especially, cathode part, must be innert.
In the single cell operation with CaO-CaF_2-TiO_2 slag, the maximum cathodic current efficiency was 12%, and the anodic current efficiency was far less than 100%. The reasons must be 1) formation of metal fog of Ca and its re-oxidation at the anode, 2) formation of Ti^<2+> by the reaction of Ti with Ti^<4+> and its re-oxidation at the anode, and 3) formation of Ti^<2+> by the insufficient amount of Ca and its re-oxidation at the anode. Thus, it is important to control the electrodes distance properly and to control the TiO_2 content properly.
On the contrary, by the addition of Al_2O_3 to the slag, c.a. 70 g of electro-deposit and c.a. 60% of cathodic current efficiency were obtained. The reasons must be that the temperature of molten slag should be kept higher temperature by the addition, and that the Al deposit should act as the reductant of Ti^<4+> in the slag. This process is good for producing Ti-Al alloy, but not good for producing pure Ti, because the electro-deposit contained much Al.
On the base on the above results, the new apparatus was designed. It consists of twin cell, one of which is anode cell and the other, cathode cell, connected with molten salt bridge. By this apparatus, the distance between cathode and anode can be kept long, resulting in the larger current efficiency and better quality of electro-deposit. The apparatus was successfully operated. Thus, the proposed process is very promising. The above results are published in 6 papers. -
New Coating & Metallizing Process of Refractory Metals & Compound in Molten Salt Bath
Grant number：15360401 2003 - 2005
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
TAKENAKA Toshihide, KAWAKAMI Masahiro
Grant amount：\13700000 （ Direct Cost: \13700000 ）
Coating and metallizing of refractory metal or its compound by using a disproportionation reaction in molten salt has been studied. Titanium coating in NaCl-KCl equi-molar melt with Ti chloride or fluoride at 1000-1200K was mainly examined in this study. The results are summarized as follows ;
1) The effects of some factors on the disproportionation reaction were clarified theoretically and experimentally. Titanium can be deposited by temperature change owing to the shift in the equilibrium. Titanium alloy coating should also be expected in the case that the substrate can form Ti alloy. Addition of fluoride in the bath may improve the rate of Ti deposition.
2) Titanium metal deposited on alumina substrate by the simple immersion for hours, while Ti compound was seen on quartz glass substrate. These deposits seemed particle-like, and a dense coating layer wasn't obtained. The temperature gradient in the bath seemed effective in the improvement in the deposition rate.
3) Dense and coherent Ti alloy layers up to 100μm were formed on Fe, Ni and carbon steel. The layer consisted of some layers with different composition, and almost the same Ti alloy layer was obtained in the bath with TiCl_8 and K_2TiF_6. The change in the formation rate indicated that the diffusion of the elements in the formed layer controlled the formation rate of the layer. Corrosion resistance of steel against saline was remarkably improved by our Ti alloy coating. A dense and coherent Ti metal layer of a few μm was obtained on stainless steel, and Cr seemed to influenced the peculiar behavior of stainless steel. Deposition in LiCl-KCl eutectic melt at lower temperature was also tried in this study, but enough Ti deposit wasn't obtained.
4) MoO_2 was deposited on metal substrates in the melt with K_2MoO_4, while no deposit was obtained on ceramic. -
Electrorefining and Recycling of Magnesium
Grant number：11225208 1999 - 2002
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas
TAKENAKA Toshihide, KAWAKAMI Masahiro
Grant amount：\23000000 （ Direct Cost: \23000000 ）
The application of electrorefining process for the purification of Mg and for the recycling of Mg scrap has been studied in MgC12-NaCl-CaC12 and MgC12-NaCl-KCl molten salts. The electrochemical behaviors of Mg and impurity elements, such as Fe and Ni, were measured by voltammetry, and the necessary conditions of the electrorefining of Mg were deduced. The electrorefining of Mg was carried out on the basis of the result by the electrochemical measurement. By the process, impurity elements were removed from Mg metal effectively, and the suitable electrolysis condition was revealed. Because Mg alloys were purified by the electrorefining, this process can be applied for the recycling of Mg and its alloys. It was also shown that the more efficient electrolysis can be actualized by the so-caalled three-layer electrolysis where MgCu alloy was used as anode.
Co-e1ectrodeposition of alloying elements, such as rare earth metal, with Mg has been also studied in the same molten salt system including rare earth metal chlorides. Rare earth metals were electrodeposited with Mg metal, and their contents can be controlled by the electrolysis conditions, such as the concentration of their chloride in the salts. The Mg metal including the same amount of rare earth metals as those by electrolysis showed good corrosion-resistivity. It is concluded that the co-electrodeposition of rare earth metals with Mg can be available for the production of Mg alloy. -
New Concept for Electrplysis of Rare Metals-application of hydrogen gas oxidation as anodic reaction=
Grant number：10650730 1998 - 2000
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
TAKENAKA Toshihide, KAWAKAMI Masahiro
Grant amount：\3500000 （ Direct Cost: \3500000 ）
Electrolysis of rare metal has been studied by using H_2 gas oxidation as anodic reaction. Ti was chosen as a target material because of its wider market. Two other methods were also tried, namely electrowinning of Ti from a fluoride-chloride melt and direct electrolysis of a Ti ingot at high temperature.
The results are summaized as follows ;
(1) Ti metal was electrowon in a LiF-NaF-KF melt with K_2TIF_6. Partial electrochemical reduction of Ti ions was not necessary so that the process was simplified in comparison to that in a chloride melt. The electrochemical oxidation of H_2 gas at a carbon gas electrode could be used as an anodic reaction for the process. Stable electrolysis was performed, and the cell voltage kept very low as about 2V.However, the morphology of the deposited Ti was usually powdery. Rinsing of the salt with water was not easy.
(2) Ti metal was electrowon in a NaCl-KCI-NaF-KF melt with K_2TIF_6. The anode potential could be controlled to lower value under the suitable condition, and stable electrolysis was conducted. Partial electrochemical reduction of Ti ions was not necessary. and a gas electrode was disused. Therefore, the process could be simplified in comparison to not only that in a chloride melt and also that in a fluoride melt by using H_2 gas oxidation as anodic reaction. The NaCl-KCl-NaF-KF salt was removed from the Ti deposit with water more easily than the LiF-NaF-KF salt.
(3) High DC-current was applied through a CaF_2-CaO mixture containing TiO_2 in an electro-slag remelting apparatus. The mixture was melted by Joule heat. and Ti metal was obtained at the cathode on the bottom of the cell. It is concluded that this process is promising in principal, and that a sufficient heat must be supplied to actualize the process. -
Physicochemical Research on Molten Salt Electrolysis of Ti and Ti-Al
Grant number：06452340 1994 - 1996
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
KAWAKAMI Masahiro, TAKENAKA Toshihide
Grant amount：\7800000 （ Direct Cost: \7800000 ）
The physicochemical research on molten salt electrolysis of Ti and Ti-Al has been carried out. The results is summarized as follows ;
1.Electrowinning of Ti in molten chloride
Three electrode reactions have been studied in detail, and the valuable results for the development of more efficient electrowinning process were obtained.
(1) Electrodeposition of Ti
The dependence of the morphology and purity of Ti deposit and the cathodic current efficiency upon the electrolysis condition was investigated, and the proper condition was specified. Moreover, the effect of fluoride addition in chloride melt on the electrodeposition of Ti was studied.
(2) Electro-oxidation of H_2 gas
It was shown that H_2 gas could be oxidized anodically on carbon electrode, and that the electricity of the electrowinning of Ti could be reduced by the use of H_2 oxidation. The dependence of oxidation rate on the electrolysis condition was investigated, and the behavior of reaction product was studied.
(3) Partial reduction of TiCl_4
The electrochemical partial reduction of TiCl_4 was studied in detail, because it was an effective process for the supply of Ti ion in chloride melt. The effect of the electrolysis condition on reduction rate and reaction product was studied.
2.Electroplating of TiB_2
The electrode reaction of Ti ion in molten fluoroborate was studied in detail, and it was shown that TiB_2 could be deposited under a suitable condition. The dependence of TiB_2 deposition on electrolysis condition was investigated, and the condition where the good electroplationg layr of TiB_2 was obtained was specified.
Devising educational methods
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2009年度までは、国立大学法人豊橋技術科学大学に在職して、情報処理、電磁気学、応用熱力学、腐食工学、電気化学などに関する授業、および学生実験を、学部・大学院で担当した。一部の授業では、プレゼンテーションソフトなどを多用し、電磁気学の授業についてはWEB教材化して、外部発信した。また、社会人教育として、人材育成事業にも参画して授業を行った。 2010年度からは、学校法人関西大学に在職して、反応速度論、応用熱力学、環境工学、金属生産工学、技術英語などに関する授業、および学生実験を、学部・大学院で担当している。可能な限りミニッツペーパーなどを用いることによって、学生の意見を聞き、授業内容の改善を進めている段階である。また、授業内で簡単な課題を与えて解かせるなど、学生の授業参加も考慮した授業を試みている。
Teaching materials
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関西大学での教育に用いた主な教科書等は以下の通りである。なお、参考書は適宜紹介している。 反応速度論：「アトキンス・物理化学」、東京化学同人 応用熱力学：「金属物理化学」、日本金属学会 環境工学：（資料を作成して配布） 材料プロセス工学：（資料を作成して配布） 金属生産工学特論：「大学教材・鉄鋼材料（プロセス編）」JFE21世紀財団 技術英語：（資料を作成して配布） 学生実験：（コース独自の教科書）
Teaching method presentations
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Special notes on other educational activities
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特になし