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Oxidation and degradation of amorphous SiAlN coating via forming Si-Si bond

Gao, Z and Kulczyk-Malecka, J and Zhang, Z and Liu, H and Zhang, X and Chen, Y and Hill, P and Kelly, P and Xiao, P (2021) Oxidation and degradation of amorphous SiAlN coating via forming Si-Si bond. Corrosion Science, 183. ISSN 0010-938X

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Restricted to Repository staff only until 10 February 2022.
Available under License Creative Commons Attribution Non-commercial No Derivatives.

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Abstract

The oxidation and degradation of amorphous SiAlN coatings consisting of Si N and AlN phases, with 750 nm or 300 nm Mo interlayers on Zr alloy in steam environment at 1000 °C were investigated. After 1 h exposure, no detectable oxide scale formed on SiAlN/Mo (750 nm) coatings whereas SiAlN/Mo (300 nm) formed oxide scale. The downward diffusion of Si followed by relatively faster downward diffusion of N generated excessive Si and lean N, forming Si-Si bond in outermost surface of SiAlN, thereby resulting in oxidation. The degradation mechanism of amorphous nitrides was determined by elemental composition instead of reported amorphous or crystalline status. 3 4

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