Improvement of oxidation resistance of carbon fibers by coating SiC

SiC-coated carbon fibers (CFs) were prepared by spark plasma sintering, and their phase compositions and microstructures were identified by x-ray diffraction and characterized by field-emission scanning electron microscope, respectively. The oxidation behaviors of the SiC-coated CFs was examined through thermo gravimetric analysis and compared with that of pristine CFs. The effects of Si content in the SiC coatings on the surfaces of the CFs were also investigated. SiC coating with 25 wt% Si contributing to the reaction was thicker than that with 10 wt% Si but had weaker oxidation-resistant properties. When coated with SiC, the CFs exhibited considerable improvement in their oxidation resistance, and the temperature for its oxidation increased nearly by 140 °C.

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