Electrochemical extraction of Ti5Si3 silicide from multicomponent Ti/Si-containing metal oxide compounds in molten salt

Xingli Zou; Xionggang Lu; Zhongfu Zhou; Wei Xiao; Qingdong Zhong; Chonghe Li; Weizhong Ding

doi:10.1039/C3TA15039A

Electrochemical extraction of Ti₅Si₃ silicide from multicomponent Ti/Si-containing metal oxide compounds in molten salt

Xingli Zou,*^a Xionggang Lu,*^a Zhongfu Zhou,^abc Wei Xiao,^a Qingdong Zhong,^a Chonghe Li^a and Weizhong Ding^a

* Corresponding authors

^a Department of Materials Science and Engineering, Shanghai University, Shanghai 200072, P. R. China
E-mail: xlzou@shu.edu.cn, luxg@shu.edu.cn
Fax: +86-21-56335768
Tel: +86-21-56335768

^b Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK

^c Institute of Mathematics and Physics, Aberystwyth University, Aberystwyth SY23 3BZ, UK

Abstract

Ti₅Si₃ silicide has been extracted directly from complex multicomponent Ti/Si-containing metal oxide compounds by electro-deoxidation in molten calcium chloride using an inert solid oxide oxygen-ion-conducting membrane (SOM) based anode. Studies on the microstructure evolution and electrochemical extraction mechanism show that the formation of Ti₅Si₃ and the removal of impurity elements happened simultaneously during the electro-deoxidation process. It is found that the electro-deoxidation generated Ti₅Si₃ micro-particles typically possess a smooth surface, which could contribute to create a continuous anti-oxidation surface layer with excellent high-temperature oxidation resistance property. Consideration is also given to the parameters of electrolysis and the electrochemical characteristics including chemical and/or electrochemical reactions during the electro-deoxidation process, and then a relevant kinetic model is proposed.

Article information

https://doi.org/10.1039/C3TA15039A

Article type

Paper

Submitted

05 Dec 2013

Accepted

23 Feb 2014

First published

24 Feb 2014

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J. Mater. Chem. A, 2014,2, 7421-7430

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Electrochemical extraction of Ti₅Si₃ silicide from multicomponent Ti/Si-containing metal oxide compounds in molten salt

X. Zou, X. Lu, Z. Zhou, W. Xiao, Q. Zhong, C. Li and W. Ding, J. Mater. Chem. A, 2014, 2, 7421 DOI: 10.1039/C3TA15039A

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Journal of Materials Chemistry A

Electrochemical extraction of Ti₅Si₃ silicide from multicomponent Ti/Si-containing metal oxide compounds in molten salt

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Electrochemical extraction of Ti₅Si₃ silicide from multicomponent Ti/Si-containing metal oxide compounds in molten salt

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