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Abstract

The oxidation behaviour of porous nitride bonded silicon carbide (NBSC) ceramics at 1000 and 1200°C in air and wet air (20% water vapour by volume) was investigated. A rapid linear oxidation rate occurred during initial exposure (1-3 h) to air and water vapour and this was found to be followed by either parabolic or asymptotic scale growth. Water vapour influences the oxidation of NBSC: compared to oxidation in air, in wet air a higher weight gain is observed resulting from enhanced permeation of H₂O molecules through the scale, and devitrification of amorphous silica is also enhanced.

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Oxidation of nitride bonded silicon carbide in wet air atmosphere

Abstract

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