TaSi2 Oxidation Protective Coating for SiC Coated Carbon/Carbon Composites

In order to improve the oxidation protective property of carbon/carbon composites at high temperature, TaSi2 coating was prepared on the surface of SiC coated carbon/carbon composites by pack cementation technique. The crystal structure and morphology of the as-obtained coating was analyzed by XRD and SEM with EDS. The isothermal oxidation test was carried out in air at 1773 K. The results show that the as-prepared coating is composed of SiC, Si and TaSi2. The multilayer coating is about 200 μm in thickness, and there are no cracks in it. The results of EDS indicate that TaSi2 can effectively fill the holes of SiC coating. There is no visible interface between the TaSi2 outer coating and the SiC inner coating. The isothermal oxidation curve of the TaSi2/SiC coated carbon/carbon composites reveals that the coating can effectively protect carbon/carbon composites for 233 h at 1773 K.