HfB<sub>2</sub>-ZrB<sub>2</sub>-SiC改性C/C复合材料的制备及性能

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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∙m^1/2 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.

Key words： C/C-HfB₂-ZrB₂-SiC composites slurry microstructure mechanical property ablation resistance

Received: 01 November 2019 Published: 19 June 2020

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	XIANG Qiuling
	TANG Zhenxiao
	PENG Ke
	YI Maozhong

Cite this article:

XIANG Qiuling,TANG Zhenxiao,PENG Ke, et al. Preparation and properties of HfB₂-ZrB₂-SiC modified C/C composites[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(2): 118-124.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I2/118

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