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Effect of SiC-ZrC Coating Prepared by SiZr Liquid Phase Sintering on the Oxidation Resistance of C/SiC Composites
Pi Huilong1; Shi Xiaolei2; Xu Xingxiang2
Corresponding AuthorShi Xiaolei(xlshi@imr.ac.cn)
2021-06-01
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume57Issue:6Pages:791-796
AbstractOwing 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.
Keywordoxidation resistant coating SiC-ZrC liquid-phase sintering
DOI10.11900/0412.1961.2020.00357
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000657818600009
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/160399
Collection中国科学院金属研究所
Corresponding AuthorShi Xiaolei
Affiliation1.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
Recommended Citation
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.
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