An oxidation and ablation protective WSi2-HfB2-SiC coating for SiC coated C/C composites at 1973 K and above

• DOI: 10.1016/j.corsci.2020.108964
• Publication Date: 2020-09-07T23:34:16Z
• Authors: Peipei Wang; Hejun Li; Ruimei Yuan; Wei Xie; Yulei Zhang
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract WSi2-HfB2-SiC outer coatings were prepared by in-situ sintering reaction methods. The effect of WSi2 content on the oxidation resistance of HfB2-SiC coating was investigated. The results show that the WSi2-HfB2-SiC coating with 25 wt.% WSi2 (W2) has the best oxidation resistance and can protect C/C substrate for 100 h at 1973 K in air environment. After ablation for 90 s, the linear ablation rate and mass ablation rate of W2 are −3.89 × 10−7 m/s and 6.78 × 10-5 g/s, respectively, showing excellent ablation resistance. The good oxidation and ablation resistance of W2 is attributed to the formation of flowing multiphase glass with inlay.