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采用碳纤维针刺预制体,用前驱体浸渍裂解(PIP)法分别制备了C/C-SiC和C/C-SiC-ZrC陶瓷基复合材料,并对材料的微观结构、力学和烧蚀性能进行了分析对比。结果表明:利用该方法可制备出陶瓷相填充充分且分布均匀的复合材料。C/C-SiC-ZrC的面内弯曲强度、厚度方向的压缩强度、层间剪切强度均低于对应的C/C-SiC的。2 200℃、600s氧化烧蚀后,C/C-SiC-ZrC的抗烧蚀性能显著优于C/C-SiC,其线烧蚀率下降43.8%,质量烧蚀率下降25%。在超高温阶段,C/C-SiC-ZrC复合材料基体的ZrC氧化生成的ZrO2溶于SiC氧化生成的SiO2中,形成黏稠的二元玻璃态混合物,有效阻止了氧化性气氛进入基体内部。
C / C-SiC and C / C-SiC-ZrC ceramic matrix composites were prepared by precursor impregnation and pyrolysis (PIP) method. The microstructure, mechanical properties and ablation properties of the composites were investigated. Analysis and comparison. The results show that this method can be used to prepare a fully filled and uniformly distributed ceramic composite. The in-plane bending strength, the compressive strength in the thickness direction, and the interlaminar shear strength of the C / C-SiC-ZrC are lower than those of the corresponding C / C-SiC. The ablation resistance of C / C-SiC-ZrC was significantly better than that of C / C-SiC after 2 200 ℃, 600s oxidation ablation. The ablation rate decreased 43.8% and the mass ablation rate decreased 25%. In the ultra-high temperature stage, the ZrO2 produced by the ZrC oxidation of the matrix of C / C-SiC-ZrC composites dissolves in the SiO2 formed by SiC oxidation to form a viscous binary glassy mixture that effectively prevents the oxidizing atmosphere from entering the matrix.