C/C复合材料密度及预氧化处理对SiC涂层的影响

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Abstract SiC coatings were prepared on the surface of carbon/carbon (C/C) composites with densities of 0.8, 1.4 and 1.8 g/cm³ by the pack cementation. The samples with a density of 1.8 g/cm³ were selected to research the effect of pre-oxidation treatment on structure and oxidation resistance of the coating. Scanning electron microscope and X-ray diffractometer were used to study the microstructure and phase composition of the coating. The anti-oxidation resistance of the coating was tested by static air oxidation at 1 500 ℃. The results show that as the density of the C/C composites increases, the thickness of the coating decreases, and the boundary between the coating and the substrate becomes more obvious. After the pre-oxidation treatment of 1.8 g/cm³ C/C composites, the surface roughness increases, and the ring pores around the carbon fibers on the surface are generated. After pack cementation process, the thickness of coating increases and becomes more uniform and compact. After the sample is oxidized in static air at 1 500 ℃ for 334 h, the oxidation mass loss rate is 0.684×10^-4 g/(cm²·h). The mullite phase is formed on the surface of the sample, and the oxidation resistance was significantly improved.

Key words： carbon/carbon composites silicon carbide coating pre-oxidation pack cementation anti-oxidation resistance

Received: 02 December 2020 Published: 07 May 2021

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	YANG Fan
	XIE Aolin
	ZHANG Bei
	YI Maozhong

Cite this article:

YANG Fan,XIE Aolin,ZHANG Bei, et al. Effect of the density of C/C composites and pre-oxidation process on SiC coatings[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(2): 132-138.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I2/132

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