多孔碳纤维增强陶瓷基复合材料抗氧化烧蚀涂层的制备及性能研究

To improve the oxidation oblation resistance of porous carbon fiber reinforced ceramic matrix composite, double-layer structure ceramic coating was designed, and the ZrB₂-SiC-glass internal coating was prepared by a slurry sintering method, while the ZrB₂-MoSi₂-glass coating was prepared by atmospheric plasma spraying in the outer layer. The phase structure and morphology of the coating were examined by XRD and SEM, and the coating was ablated by oxygen-acetylene flame, It is shown that the sealing effects is better when the glass content of the inner coating is 30% and dense inner coating can be obtained by sintering at 1300 ℃ for 2 h. Outer coating having good adhesion with the inner coating was prepared by using optimized plasma spraying. The anti-erosion performance of the coating is good when surface temperature is below 1500 ℃. Ablation oxidation forms a dense layer with SiO₂ as the filling phase, ZrO₂, ZrSiO₄ as the supporting phase, and the pores are sealed which effectively protect the substrate material.