High‐temperature oxidation resistance of Si‐coated C/SiC composites

Abstract

Abstract In this paper, Si coatings were sprayed onto C/SiC composite substrates by atmospheric plasma spraying (APS). The high‐temperature oxidation behavior of the substrate and coating at temperatures of 1100 and 1300 °C was also studied. The C/SiC ceramic matrix composite will be damaged seriously and even failed due to the oxidation of carbon fibers in matrix. The Si coating effectively improved the oxidation resistance of the C/SiC substrate in the high‐temperature oxidation test. The effect of the thickness of the Si coatings on the oxidation resistance was investigated. The 150‐μm coating is proved to enable the substrate to have the lowest oxidation weight loss and the best oxidation resistance after static oxidation for 5 h.