Preparation and Oxidation Properties of Carbon/Carbon Composites with the Antioxidant SiC/NiCS Coating

Abstract:

In the paper, the SiC/NiCS coating on carbon/carbon composites was designed and prepared, and its oxidation properties was investigated. The SiC transition layer is prepared by embedding method while the NiCS coating by brushing slurry. Oxidation resistance of various coatings and the same coating sintered by different ways are analyzed through the isothermal oxidation experiment. The strength retention of the samples after oxidation is tested through the three-point bending experiment. The surface and cross section morphology of the coating before and after oxidation are observed by SEM, and crystalline phases of the coating are analyzed by XRD. According to the results, the coating have excellent short-time oxidation resistance, and the weightless rate with oxidation time presents linear increasing trend basically. With the increase of temperature, the weight-loss rate increases. The more serious oxidation is, the lower bending strength retention rate is. The integrity and density of the barrier layer and the across-running cracks of the silicon carbide transition layer are the main factors influencing the oxidation resistance of the sample.

• Periodical: Key Engineering Materials (Volume 727)
• Pages: 881-888
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.727.881
• Online since: January 2017
• Authors: Yi Li, Fan Hao Zeng*, Ji An Liu, Zhi Huan Zou, Yi Gu
• Keywords: Carbon/Carbon Composites, Design Of Antioxidant Coating, Isothermal Oxidation Experiment, Scanning Electron Microscope, X-Ray Diffraction

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