Si-Al-Ir Oxidation Resistant Coating for Carbon/Carbon Composites by Slurry Dipping
Min Huang, Kezhi Li, Hejun Li
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Abstract
A Si-Al-Ir oxidation resistant coating was prepared for SiC coated carbon/carbon composites by slurry dipping. The phase composition, microstructure and oxidation resistance of the as-prepared Si-Al-Ir coating were studied by XRD (X-ray diraction), SEM (scanning electron microscopy), and isothermal oxidation test at 1773 K in air, respectively. The surface of the as-prepared Si-Al-Ir coating was dense and the thickness was approximately 100 m. Its anti-oxidation property was superior to that of the inner SiC coating. The weight loss of SiC/Si- Al-Ir coated carbon/carbon composites was less than 5 wt. pct after oxidation at 1773 K in air for 79 h. The local oxidation defects in the coating may result in the failure of the SiC/Si-Al-Ir coating.
keywords:Carbon/carbon composites; Coatings; Oxidation; Si-Al-Ir
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