采用液相浸渍结合反应熔渗法制备了Cf/H fC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Cf/H fC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ZrB2+HfO2+TaSi2改性 C/C预制体,其密度和开孔率分别为1.41 g/cm3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Cf/HfC复合材料密度和开孔率分别为2.98 g/cm3和12.95%,其线烧蚀率为0.0171 mm/s,弯曲强度为173.76 MPa,断裂方式为假塑性断裂。
The Cf/HfC composite was prepared by liquid impregnation combined reactive melt infiltration tech-nique.The impregnation efficiency,anti-oxidant and anti-ablation particles distribution morphology,infiltration effi-ciency and infiltration organization were studied,the antioxidant ablation property and mechanical properties of Cf/HfC composites were also assessed.Results show that the modified C/C preform which contains 13wt% ZrB2+HfO2+TaSi2 particles was obtained after five cycles of impregnation-carbonization and one high-temperature treat-ment process,the density and open porosity of which are 1.41 g/cm3 and 24.84%,respectively.Particles are main-ly distributed in matrix carbon between fiber bundles,and the distribution is uniform.The Cf/HfC composites whose density and open porosity are 2.98 g/cm3 and 12.95%,was prepared after Hf35Zr10Si5Ta alloy reactively melt infiltrated modified C/C perform.The linear ablation rate is 0.017 1 mm/s,the flexural strength is 173.76 MPa,and the fracture mechanism is pseudo-ductile fracture.
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