期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 13, 页码 6160-6170出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.06.055
关键词
Slurry impregnation; C; C-HfB2 -SiC; Mechanical property; Ablation resistance
资金
- National Basic Research Program of China [ZB 4142 20201]
An improved high-solid-loading slurry impregnation process was developed to efficiently introduce HfB2 particles into a low-density C/C preform, followed by precursor infiltration and pyrolysis process for densification to obtain a C/C-HfB2-SiC composite. Microstructure characterization showed uniform distribution of HfB2 particles and good densification of the composite material, resulting in improved bending strength and non-brittle fracture behavior.
An improved high-solid-loading slurry impregnation process was developed to introduce HfB2 particles into a low-density C/C preform efficiently, and precursor infiltration and pyrolysis process was used for densification to obtain a C/C-HfB2-SiC composite. The microstructure characterization revealed that HfB2 particles uniformly filled the pores in the C/C preform, and SiC well densified the interstices between HfB2 particles and the small pores in the carbon fiber bundles. After being tested, the C/C-HfB2-SiC composite had a density of 4.07 g/cm3 and a bending strength of 344.8 MPa, and exhibited a non-brittle fracture behavior. After ablation with oxyacetylene flame at 2500 for 120 s, the mass ablation rate and linear ablation rate of the C/C-HfB2-SiC composite were 0.5 mg/s and 0.415 mu m/s, respectively. The good ablation performance is attributed to the hindering effect of the HfO2 scale on oxygen diffusion at high temperature.
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