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Evaluating the Durability of SiC-Coated Carbon Composites Under Thermal Shock Conditions

Lee Ji Eun, Bae Soo Bin, Cho Nam Choon, Lee Hyung Ik, Meng Zicheng, Lee Kee Sung

Archives of Metallurgy and Materials

2021

Vol. 66, iss. 3

777--782

Oxidation and indentation properties of silicon carbide-coated carbon composites were investigated to analyze its durability under atmospheric thermal shock conditions. The silicon carbide-coated samples were prepared either with chemical vapor deposition or chemical vapor reaction/chemical vapor deposition hybrid coating. The remnant weight of uncoated and coated samples was investigated after each thermal shock cycle. The surface and cross-section of coated samples were then analyzed to confirm morphological changes of the coating layers. The spherical indentation test for uncoated and coated samples were also performed. As a result, silicon carbide coating improved the oxidation resistance, elastic modulus, and hardness of carbon composites. Hybrid coating drastically enhanced the durability of samples at high temperature in atmospheric conditions.

Development of Superior Thermal Protective Coating on Carbon Composites

Bae Soo Bin, Lee Ji Eun, Paik Jong Gyu, Cho Nam Choon, Lee Hyung Ik

Archives of Metallurgy and Materials

2020

Vol. 65, iss. 4

1371--1375

A superior SiC based thermal protection coating process for carbon composite, which can be especially effective in a hot oxidizing atmosphere, was established in this study. A multi-coating process based on a combination of Chemical Vapor Reaction (CVR) and Chemical Vapor Deposition (CVD) was developed. Various protective coating layers on carbon composite were tested in hot oxidizing surroundings and the test results verified that the thermal ablation rate could be dramatically reduced down to 3.8% when the protective multi-coating was applied. The thermal protection mechanism of the coating layers was also investigated.