A direct electrochemical route from oxides to Ti-Si intermetallics

Xingli Zou, Xionggang Lu*, Chonghe Li, Zhongfu Zhou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

74 Citations (SciVal)

Abstract

The titanium silicide intermetallics have been directly prepared from the mixture of titanium oxide (TiO2) and silicon oxide (SiO2) powder by using the solid-oxygen-ion-conducting membrane (SOM) electrolysis process. The electrochemical process was carried out in a molten flux CaCl2 at 950 degrees C with a potential of 3.5-4.0 V. The effects of the stoichiometry of the initial mixture on the electrolysis characteristics and the final product compositions were investigated. It has been found that the molar ratio of TiO2:SiO2 dominates the composition of final products. A single-phase suicide Ti5Si3 intermetallic was obtained when the TiO2:SiO2 molar ratio is 5:3; the TiSi was identified as the dominant phase with a minor amount of TiSi2 at TiO2:SiO2 molar ratio 1:1; three silicide phases, Ti5Si4, Ti5Si3 and TiSi, were found coexisting in the final product produced from TiO2-SiO2 mixture of molar ratio 5:4; the product of electrolysis consisted of the compound Ti5Si3 and the pure metal Ti as TiO2:SiO2 molar ratio equals to 3:1; and two silicide phases, TiSi and TiSi2, are formed as TiO2:SiO2 molar ratio equals to 1:2. The preliminary experimental results suggest that the electro-deoxidization process is fast and the current efficiency reached 75%. (C) 2010 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)5173-5179
Number of pages7
JournalElectrochimica Acta
Volume55
Issue number18
Early online date24 Apr 2010
DOIs
Publication statusPublished - 15 Jul 2010

Keywords

  • TECHNOLOGY
  • COMBUSTION SYNTHESIS
  • COMPOSITES
  • Ti-Si intermetallics
  • DEOXIDATION
  • MOLTEN CALCIUM-CHLORIDE
  • SILICIDES
  • SOM
  • Electrochemical reduction
  • MEMBRANE
  • ALLOYS
  • REDUCTION
  • Ti5Si3
  • TITANIUM-DIOXIDE
  • Oxides

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