熔渗法制备MoSi<sub>2</sub>改性C/C复合材料的组织结构与力学性能

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Abstract SiC coatings were prepared on the surface and inside of porous low-density C/C composites by chemical vapor phase reaction using Si and SiO₂ powders as raw materials. MoSi₂ powder was used as raw materials to reactive infiltrate C/C composites and C/C composites with SiC interface layer to obtain MoSi₂ modified C/C composites. The microstructure of the composites was investigated by scanning electron microscopy, X-ray diffraction and electron probe microanalysis. The bending strength of the material was tested by Instron 3369 mechanical testing machine. The results show that compared with the Si-Mo modified C/C composite prepared by MoSi₂direct infiltration, the SiC coating prepared before infiltration can effectively reduce the porosity of the SiC/C composite and obtain more compact Si-Mo modified C/C composite. The density of composites increases from 2.93 g/cm³ to 3.20 g/cm³, the open porosity decreases from 10.77% to 4.07%; the flexural strength increases from 87 MPa to 121 MPa. The content of SiC and MoSi₂ in composites is higher. The composites exhibit pseudoplastic fracture behavior.

Key words： MoSi₂ C/C composite reaction melt infiltration SiC interface layer microstructure flexural strength

Received: 02 July 2019 Published: 19 June 2020

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	YI Jun
	ZHANG Bei
	TANG Zhengxiao
	XIANG Qiuling
	YI Maozhong

Cite this article:

YI Jun,ZHANG Bei,TANG Zhengxiao, et al. Microstructure and mechanical properties of MoSi₂ modified C/C composites prepared by infiltration[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(6): 529-535.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I6/529

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