温压固化结合CVI增密制备石墨基复合材料的微观结构与性能

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Abstract Using natural flake graphite powder, mesophase pitch powder and short carbon fiber as raw materials, graphite-based composites are prepared by the method of warm-pressure curing combined with chemical vapor infiltration (chemical vapor infiltration, CVI). The influence of CVI deposited pyrolytic carbon (PyC) on the microstructure and properties of graphite-based composites was studied through X-ray diffraction analysis, scanning electron microscopy and polarized light microscopy, as well as mechanical performance and thermal conductivity testing. The results show that the bending strength of the composites after CVI densification is improved compared with the graphite-based composites doped with short carbon fibers. By introducing PyC into the composite material through CVI, the bending strength of the graphite-based composites increases from 22.5 MPa to 55.9 MPa. Besides, the average grain size of the material and the degree of graphitization increase, which thereby improves the thermal conductivity of the material from 213.24 W/(m·K) to 242.80 W/(m·K).

Key words： graphite matrix composite chemical vapor infiltration microstructure mechanical properties thermal conductivity

Received: 13 January 2021 Published: 21 July 2021

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	ZHANG Yang
	LI Guodong
	HAN Qianwu
	JIANG Yi
	WANG Yang

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ZHANG Yang,LI Guodong,HAN Qianwu, et al. Microstructure and properties of graphite-based composites prepared by warm-pressure curing combined with CVI densification[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(3): 211-218.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I3/211

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