A new process for preparing Ti-Al alloys from low-valance titanium chlorides slurry by direct electrochemical reduction

Zhu Fuxing; Ma Zhanshan; Deng Bin; Mu Tianzhu; Qiu Kehui

doi:10.7513/j.issn.1004-7638.2024.01.002

Volume 45 Issue 1

Feb. 2024

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Zhu Fuxing, Ma Zhanshan, Deng Bin, Mu Tianzhu, Qiu Kehui. A new process for preparing Ti-Al alloys from low-valance titanium chlorides slurry by direct electrochemical reduction[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(1): 4-11. doi: 10.7513/j.issn.1004-7638.2024.01.002

Citation:

Zhu Fuxing, Ma Zhanshan, Deng Bin, Mu Tianzhu, Qiu Kehui. A new process for preparing Ti-Al alloys from low-valance titanium chlorides slurry by direct electrochemical reduction[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(1): 4-11. doi: 10.7513/j.issn.1004-7638.2024.01.002

Citation:

Zhu Fuxing, Ma Zhanshan, Deng Bin, Mu Tianzhu, Qiu Kehui. A new process for preparing Ti-Al alloys from low-valance titanium chlorides slurry by direct electrochemical reduction[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(1): 4-11. doi: 10.7513/j.issn.1004-7638.2024.01.002

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A new process for preparing Ti-Al alloys from low-valance titanium chlorides slurry by direct electrochemical reduction

doi: 10.7513/j.issn.1004-7638.2024.01.002

Zhu Fuxing^{1, 2
,},
Ma Zhanshan^{1, 3},
Deng Bin¹,
Mu Tianzhu¹,
Qiu Kehui^{2
,
,}

1.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China
2.
College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, Sichuan, China
3.
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China

Received Date: 2023-08-07
Publish Date: 2024-02-01

Abstract

Abstract

Owing to the lack of systematic research on electrochemical behaviors and unclear high-temperature oxidation resistance characteristics of Ti-Al alloys prepared from low-valence titanium chlorides slurry by the electrochemical reduction in molten salt, the electrochemical workstation and differential thermal gravimetric analyzer were used to study the electrochemical behavior of LTC slurry in the molten salt system and the high-temperature oxidation resistance characteristics of alloy products. The results show that LTC slurry can be directly electrochemically reduced to Ti-Al alloys, following a step-by-step reduction process: Ti³⁺→Ti²⁺, Al³⁺→Al, Ti³⁺/Al³⁺→Ti-Al alloys, and Ti²⁺→Ti. As the concentration of Ti³⁺ ions in molten salts increases, the composition of Ti-Al alloys changes as follows: Al/Al₃Ti→Al₃Ti₂/Al₅Ti₂→AlTi/Al_0.64Ti_0.36→Al_0.64Ti_0.36/AlTi₃→AlTi₃→AlTi₃/Ti→Ti. The variation law of product morphology is as follows: coarse dendrite→fine dendrite→fine spherical structure→coarse spherical aggregate→fine spherical aggregate→fine spherical porous structure→porous structure. With the increase of aluminum content and product density in Ti-Al alloys, the high-temperature oxidation resistance gradually enhances. After high-temperature melting, Al_0.64Ti_0.36/AlTi₃ alloy shows α₂ and γ phase structures with a higher Al content, and its high-temperature oxidation resistance is superior to commercial Ti48Al2Cr2Nb. The high-temperature oxidation process of Ti-Al alloys is as follows: Ti-Al alloys→titanium aluminate→rutile/alumina, and the formed oxide layer can effectively prevent further oxidation.
- Ti-Al alloys,
- low-valance titanium chlorides slurry,
- electrochemical reduction,
- high temperature oxidation resistance

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References(21)

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