Effect of SiC-ZrC Coating Prepared by SiZr Liquid Phase Sintering on the Oxidation Resistance of C/SiC Composites

doi:10.11900/0412.1961.2020.00357

IMR OpenIR

	Effect of SiC-ZrC Coating Prepared by SiZr Liquid Phase Sintering on the Oxidation Resistance of C/SiC Composites
	Pi Huilong 1; Shi Xiaolei 2; Xu Xingxiang 2
通讯作者	Shi Xiaolei(xlshi@imr.ac.cn)
	2021-06-01
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	57 期号:6 页码:791-796
摘要	Owing to their low density and good mechanical properties at high temperatures, C/SiC composites are increasingly used in the aerospace industry. They are also being proposed as thermal-structural materials in the hypersonic field; however, C/SiC composites are easily oxidized in high-temperature air environments. In this study, a C/SiC composite was coated with a SiC-ZrC oxidation-resistant layer by a two-step sintering method using Si-25%Zr (mass fraction) alloy, and the phase evolution of the coating was studied during the sintering. The oxidation resistance of the material was then tested at 1400 degrees C in an air environment. The microstructural changes of the coating before and after oxidation and the effect of oxidation on the bending properties of C/SiC were analyzed. After the reaction with carbon, Si and ZrSi2 disappear in the coating, leaving only pure ZrC and SiC. The ZrC phase refined the structure of the reactive SiC layer. The grain size of the sintered SiC was 2 mu m, versus 5-20 mu m for SiC sintered from pure Si. The refined grains created a dense and continuous SiO2 film during the oxidation process. As the oxidation time was increased at 1400 degrees C, the C/SiC composite with the SiC-ZrC coating began losing weight at 200 s, but began gaining weight at 500 s as a dense SiO2 film was formed. After 1000 s of oxidation, the flexural strength of the C/SiC composites was 335 MPa, only 5% lower than that of the initial C/SiC composite. According to this result, the sintered SiC-ZrC oxidation-resistant film effectively protected the mechanical properties of the C/SiC composite during the oxidation process.
关键词	oxidation resistant coating SiC-ZrC liquid-phase sintering
DOI	10.11900/0412.1961.2020.00357
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000657818600009
出版者	SCIENCE PRESS
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/160399
专题	中国科学院金属研究所
通讯作者	Shi Xiaolei
作者单位	1.Northwestern Polytech Univ, State Key Lab Thermostruct Composite Mat, Xian 710072, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Pi Huilong,Shi Xiaolei,Xu Xingxiang. Effect of SiC-ZrC Coating Prepared by SiZr Liquid Phase Sintering on the Oxidation Resistance of C/SiC Composites[J]. ACTA METALLURGICA SINICA,2021,57(6):791-796.
APA	Pi Huilong,Shi Xiaolei,&Xu Xingxiang.(2021).Effect of SiC-ZrC Coating Prepared by SiZr Liquid Phase Sintering on the Oxidation Resistance of C/SiC Composites.ACTA METALLURGICA SINICA,57(6),791-796.
MLA	Pi Huilong,et al."Effect of SiC-ZrC Coating Prepared by SiZr Liquid Phase Sintering on the Oxidation Resistance of C/SiC Composites".ACTA METALLURGICA SINICA 57.6(2021):791-796.