SiC nanowire-toughened MoSi2-WSi2-SiC-Si multiphase coating for improved oxidation resistance of C/C composites

To improve the oxidation resistance of carbon/carbon (C/C) composites at high temperature, a SiC nanowire-toughened MoSi2-WSi2-SiC-Si multiphase coating was prepared by chemical vapor deposition (CVD) and pack cementation. The microstructure, mechanical properties and oxidation resistance of the coa...

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Published inCeramics international Vol. 42; no. 11; pp. 12573 - 12580
Main Authors Zhang, Yulei, Zhang, Pengfei, Ren, Jincui, Zhang, Leilei, Zhang, Jiaping
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.08.2016
Subjects
Ceramic coating
Oxidation resistance
SiC nanowires
Oxidation resistance
SiC nanowires
Ceramic coating
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Summary:To improve the oxidation resistance of carbon/carbon (C/C) composites at high temperature, a SiC nanowire-toughened MoSi2-WSi2-SiC-Si multiphase coating was prepared by chemical vapor deposition (CVD) and pack cementation. The microstructure, mechanical properties and oxidation resistance of the coating were investigated. After the introduction of SiC nanowires, the elastic modulus, hardness, and fracture toughness of the MoSi2-WSi2-SiC-Si coating were increased by 25.48%, 4.09% and 45.03%, respectively. The weight loss of the coated sample with SiC nanowires was deceased from 4.83–2.08% after thermal shock between 1773K and room temperature for 30 cycles and the weight loss is only 3.24% after isothermal oxidation at 1773K in air for 82h. The good oxidation resistance of the coating is mainly attributed to that SiC nanowires can effectively inhibit the propagation of cracks in the coating by the toughening mechanisms including bridging and pull-out.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2016.05.056