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Influence of alumina on the passive oxidation at low oxygen pressure of hot-pressed α-SiC

2008; Elsevier BV; Volume: 60; Issue: 7 Linguagem: Inglês

10.1016/j.scriptamat.2008.11.013

1872-8456

Ludovic Charpentier, Alexandre Maı̂tre, Marianne Balat‐Pichelin, Sylvie Foucaud, F. Audubert,

Advanced materials and composites

The influence of an alumina content (2 wt.%) on the oxidation behavior of hot-pressed α-SiC is studied. Sintering of α-SiC powder with alumina rests on the formation of a liquid phase corresponding to the eutectic composition in the SiO2–Al2O3 system. The oxidation kinetics of pure α-SiC at 1470 K under helium with an oxygen partial pressure of 0.1 Pa is linear, although silica is produced. The formation of Al-rich crystallized phase could be responsible for the slower oxidation kinetics of alumina-doped SiC.