B<sub>4</sub>C颗粒对C/C-SiC复合材料微观结构与力学性能的影响

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Abstract B₄C particles modified C/C-SiC composites were prepared by slurry infiltration combined with precursor infiltration and pyrolysis. The effect of the addition of B₄C particles on the mechanical properties of C/C-SiC composites was investigated. The results show that,the flexural strength and fracture toughness of B₄C particles modified C/C-SiC composites are 250.41 MPa and 13.56 MPa·m^1/2, respectively. Compared with C/C-SiC composites, the flexural strength decreases by 45.5%, the toughness increases by 46.0%. The B₄C particles can promote the sintering of SiC matrix. However, the bending strength of the composites decrease due to the formation of a large number of closed pores and weak interfaces of the matrix. The main reason for the improvement of the fracture toughness of the C/C-SiC composites modified by B₄C particles is that the weak interface between B₄C particles and SiC matrix make the cracks deflect effectively in the SiC matrix, increase the propagation path of the cracks in the matrix, and improve the fracture toughness of the composites.

Key words： C/C-SiC composites B₄C modification slurry infiltration precursor infiltration and pyrolysis mechanical property

Received: 04 September 2019 Published: 19 June 2020

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	TANG Zhenxiao
	PENG Ke
	XIANG Qiuling
	YI Jun
	YI Maozhong

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TANG Zhenxiao,PENG Ke,XIANG Qiuling, et al. Effect of B₄C particles on microstructure and mechanical properties of C/C-SiC composites[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(6): 542-548.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I6/542

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