Abstract：C/C-HfB2-ZrB2-SiC composites with a density of 3.37 g/cm3 were prepared by high-solid-loading slurry impregnation and densified by polycarbosilane precursor infiltration and pyrolysis process, and the high-solid-loading slurry consist of HfB2 and ZrB2 ceramic powders with a volume fraction of 1:1. The microstructure, mechanical properties and ablation resistance of the composites were investigated. The results show that HfB2 and ZrB2 ceramic particles introduced by slurry impregnation method are mainly distributed in short cut fiber web layer and needle-punched area of C/C composites. SiC obtained by polycarbosilane precursor infiltration and pyrolysis process mainly distributes between ceramic particles and fiber bundles. HfB2, ZrB2 and SiC are uniformly filled in the materials. The bending strength and fracture toughnes of the C/C-HfB2-ZrB2-SiC composites are 382.6 MPa and 11.2 MPa∙m1/2 respectively, showing obvious pseudoplastic fracture characteristics. In the process of ablation, the formation of HfO2-ZrO2 mixed layer preventes oxygen from entering into the composites, which improves the ablation resistance of the material. C/C-HfB2-ZrB2-SiC composites exhibit good ablation resistance at 2 500 ℃. The linear and mass ablation rates after ablation for 120 s are 0.71 μm/s and 0.53 mg/s.
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2020, Vol. 25 
