基于定向多孔SiC的浸渍-裂解法制备SiC陶瓷材料的结构与性能

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Abstract The porous SiC scaffolds were prepared by freeze casting, and then the porous scaffolds were impregnated and cracked by liquid polycarbosilane (LPVCS) to prepared SiC ceramics. The effects of the number of immersion cracking cycles on the density, porosity, microstructure and bending strength of SiC flexural were studied. The results show that, the porous SiC scaffolds formed by freeze casting are oriented porous dendrites. The density, porosity and flexural strength of the scaffolds are 0.45 g/cm³, 87.7% and 8.53 MPa, respectively. The density, porosity and flexural strength of SiC composites are 2.08 g/cm³, 5.9%, and 157.43 MPa, respectively. SiC ceramic material with lower density and good flexural strength can be otained by this method.

Key words： freeze casting silicon carbide polymer impregnation and pyrolysis porosity flexural strength

Received: 08 December 2019 Published: 19 June 2020

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	HUANG Yujuan
	XIONG Huiwen
	ZOU Jinzhu
	ZHOU Kechao
	ZHANG Dou

Cite this article:

HUANG Yujuan,XIONG Huiwen,ZOU Jinzhu, et al. Structure and properties of SiC ceramics prepared by dip cracking method based on oriented porous SiC[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(2): 133-139.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I2/133

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