High-Temperature Oxidation of Ti3Al0.7Si0.3C2 Carbide at 1100 and 1200°C in Air

Dong Bok Lee

doi:10.4028/www.scientific.net/AMM.775.176

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 775High-Temperature Oxidation of Ti3Al0.7Si0.3C2...

High-Temperature Oxidation of Ti₃Al_0.7Si_0.3C₂ Carbide at 1100 and 1200°C in Air

Abstract:

The oxidation of Ti₃Al_0.7Si_0.3C₂ carbide at 1100 and 1200°C in air for up to 50 h resulted in the formation of rutile-TiO₂, α-Al₂O₃ and SiO₂. Depending on the location of the carbide, either thin, dense, single layered oxide scales or thick, porous, bi-layered oxide scales formed. The single layered scales consisted primarily of protective Al₂O₃. The bi-layered scale consisted primarily of an outer (TiO₂+Al₂O₃)-mixed oxides, and an inner TiO₂-rich, (Al₂O₃+SiO₂)-containing oxides. Since the testing temperatures were high, the oxidation rates varied much depending on the location of the carbide.