SiC涂层对熔渗SiC<sub>f</sub>/SiC复合材料高温服役性能的影响

doi:10.11896/cldb.21070221

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Abstract SiC coating was prepared by chemical vapor deposition (CVD) on the surface of SiC_f/SiC composite manufactured by melt-infiltration. The effect of SiC coating on the high-temperature service performance of the SiC_f/SiC composite was studied. The bending test results show that the average bending strength at ambient temperature for samples with and without SiC coating were 631 MPa and 424 MPa after oxidation at 1 200 ℃ in air for 100 h, which were reduced by 6.9% and 36.2%, respectively. The test specimen without SiC coating undergoes brittle fracture with very few fibers pulled out. The severer degradation of their flexural strength could be ascribed to the oxidation of SiC fibers and degradation of BN interphase, as analyzed by SEM and XRD. As for the samples with SiC coating, silicon dioxide film was formed on the outer surface of the coating after thermal exposure and its growth follows the parabolic rate law. The samples were subjected to comparatively slighter oxidation and displayed better flexural strength due to the protection from the SiC coating, and also significant pull-out of fibers could still be observed on the fracture surface.

Key words： SiC_f/SiC composite SiC coating oxidation resistance

Published: 10 November 2022 Online: 2022-11-03

CLC number:

TB332

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	Articles by authors
	LIU Hu
	QI Zhe
	AI Yingjun
	ZHOU Yiran
	YANG Jinhua
	ZHAO Wenqing
	ZHAO Chunling
	LANG Xudong
	HE Yihong
	JIAO Jian

Cite this article:

LIU Hu,QI Zhe,AI Yingjun, et al. Effect of SiC Coating on High-Temperature Service Performance of SiC_f/SiC Composite Prepared via Melt Infiltration Process[J]. Materials Reports, 2022, 36(21): 21070221-5.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.21070221 OR http://www.mater-rep.com/EN/Y2022/V36/I21/21070221

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