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采用液相浸渍结合反应熔渗法制备了Cf/HfC复合材料。研究了浸渍效果、抗氧化烧蚀微粒分布形貌、熔渗效果与熔渗组织,并考核了C_f/HfC复合材料的抗氧化烧蚀性能和力学性能。结果表明:经5次浸渍-碳化循环和1次高温处理工艺制备了含13wt%抗氧化烧蚀微粒的ZrB_2+HfO_2+TaSi_2改性C/C预制体,其密度和开孔率分别为1.41g/cm~3和24.84%,微粒主要分布在纤维束之间的基体碳中,且分布均匀。改性C/C预制体经过Hf35Zr10Si5Ta合金反应熔渗制备的C_f/HfC复合材料密度和开孔率分别为2.98g/cm~3和12.95%,其线烧蚀率为0.017 1mm/s,弯曲强度为173.76 MPa,断裂方式为假塑性断裂。
Cf / HfC composites were prepared by liquid immersion combined with reactive infiltration method. The effect of impregnation, distribution of anti-oxidation ablated particles, infiltration infiltration and infiltration microstructure were studied. The anti-oxidation ablation and mechanical properties of C_f / HfC composites were also investigated. The results show that the density and open porosity of ZrB_2 + HfO_2 + TaSi_2 modified C / C preform with 13wt% anti-oxidation ablation particles prepared by 5 impregnation-carbonization cycles and 1 high temperature treatment process were 1.41g / cm ~ 3 and 24.84%, the particles are mainly distributed in the carbon matrix between the fiber bundles, and the distribution is uniform. The density and open porosity of C_f / HfC composites prepared by infiltration of Hf35Zr10Si5Ta alloy were 2.98g / cm ~ 3 and 12.95%, respectively, and the ablation rate of the modified C / C preform was 0.017 1mm / s. The flexural strength 173.76 MPa, the fracture mode is pseudoplastic failure.