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Research on Microstructure and Oxidation Resistance of SiC/Al-Si Coating for Carbon-carbon Composites

Guodong Sun

Abstract

Al-Si alloy coating was prepared on the surface of SiC coated carbon-carbon composites by slurry method.Microstructure and oxidation resistance of as-prepared SiC/Al-Si multi-layer coating were studied by XRD,SEM,and isothermal oxidation test under 1500℃ in air respectively.The results showed that Al3.21Si0.47 and a few Al2O3 were the main phase of Al-Si outer coating.The thickness of SiC/Al-Si multi-layer coating was about 120μm and without penetrable cracks.The oxidation resistance of SiC/Al-Si multi-layer coating was obviously better than that of single SiC coating.The mass loss of SiC/Al-Si multi-layer coated carbon-carbon composites was less than 5%(mass fraction) after oxidation for 17h.

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Key concepts: Materials science, Microstructure, Coating, Composite material, Reinforced carbon–carbon, Layer (electronics), Carbon fibers, Slurry