(Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xian 710072,China)
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Abstract:
To improve the property of anti oxidation and anti ablation of carbon/carbon (C/C) composites at high temperature, Ta 2O 5 TaC inner layer and SiC outer layer were prepared on the surface of C/C composites by pack cementation and chemical vapor deposition, respectively. Micro structure of asprepared coating was analyzed by XRD and SEM. The coated specimens were tested in static air atmosphere at 1 500 ℃and oxyacetylene ablation to research their properties of anti oxidation and antiablation. The results show that Ta2O 5 TaC/SiC multilayer coating could prevent C/C matrix from oxidation in static air atmosphere at 1 500 ℃ over 100h. The linear and mass ablative rates of coated specimens could be reduced by 47 07% and 29 20% respectively after an oxyacetylene ablation test for 60 s, indicating that Ta2O5TaC/SiC multilayer coating could effectively improve the anti ablation property of C/C composites.