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High-temperature oxidation of Ti3Al0.7Si0.3C2 compound at 900 and 1000 °C in air

✍ Scribed by D. B. Lee; T. D. Nguyen

Publisher
John Wiley and Sons
Year
2008
Tongue
German
Weight
274 KB
Volume
59
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

The compound, Ti~3~Al~0.7~Si~0.3~C~2~, was synthesized by hot pressing a powder mixture of TiC~X~ (x = 0.6), Al and Si. Its oxidation at 900 and 1000 °C in air for up to 50 h resulted in the formation of rutile‐TiO~2~, α‐Al~2~O~3~ and amorphous SiO~2~. The oxide scales formed consisted of triple layers, viz, an outer TiO~2~ layer containing Al~2~O~3~ particles, an intermediate Al~2~O~3~ layer, and an inner mixed layer that was rich in TiO~2~, but deficient in Al~2~O~3~ and SiO~2~. During oxidation, Ti diffused outwards to form the outer TiO~2~ layer, and oxygen was transported inwards to form the inner mixed layer. At the same time, carbon was liberated from Ti~3~Al~0.7~Si~0.3~C~2~. Ti~3~Al~0.7~Si~0.3~C~2~ oxidized slower than the TiO~2~‐forming kinetics, but faster than the (α‐Al~2~O~3~ or SiO~2~)‐forming kinetics.

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