Combustion Synthesis of (Ti,V)₂AlC Solid Solutions

Abstract:

(Ti,V)₂AlC solid solutions with Al₂O₃ addition were produced by solid state combustion involving aluminothermic reduction in the mode of self-propagating high-temperature synthesis (SHS). Starting materials included Ti/V₂O₅/Al/Al₄C₃ and TiO₂/V₂O₅/Al/Al₄C₃ powder mixtures. Attempts were made to obtain (Ti_1-xV_x)₂AlC with a broad substitution percentage. Combustion exothermicity was increased by increasing V₂O₅ for the yield of a higher proportion of V at the substitution site, which not only increased the combustion temperature and reaction front velocity, but also facilitated the evolution of (Ti,V)₂AlC. The Ti-containing samples showed higher reaction exothermicity and better product formation than those adopting TiO₂. As a result, (Ti_1-xV_x)₂AlC with x from 0.2 to 0.8 was produced from the samples composed of the Ti/V₂O₅/Al/Al₄C₃ mixture. The (Ti,V)₂AlC/Al₂O₃ composites synthesized in this study exhibited a laminated microstructure with closely-stacked (Ti,V)₂AlC slabs of about 0.30.8 μm.

• Periodical: Advanced Materials Research (Volume 909)
• Pages: 19-23
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.909.19
• Online since: March 2014
• Authors: Chun Liang Yeh*, Wen Jung Yang
• Keywords: Aluminothermic Reduction, Combustion Synthesis, Solid Solution, Ternary Carbides

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