Oxidation Protective C/SiC/Si-SiC Multilayer Coating for Carbon/Carbon Composites Applying at 1873 K

A C/SiC/Si-SiC multilayer coating for protecting carbon/carbon （C/C） composites against oxidation was prepared by slurry and pack cementation. X-ray diffraction （XRD） and energy dispersive spectroscopy （EDS） analysis showed that the inner coating obtained from the slurry and pack cementation was a C...

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Bibliographic Details
Published in:Journal of materials science & technology 2010-12, Vol.26 (12), p.1139-1142
Main Authors: Zhang, Yulei, Li, Hejun, Qiang, Xinfa, Li, Kezhi
Format: Article
Language:English
Subjects:
Carbon/carbon composites
Coating
Oxidation
SiO2玻璃
内涂层
抗氧化能力
炭/炭复合材料
碳/碳复合材料
碳化硅
能量色散谱
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Summary:A C/SiC/Si-SiC multilayer coating for protecting carbon/carbon （C/C） composites against oxidation was prepared by slurry and pack cementation. X-ray diffraction （XRD） and energy dispersive spectroscopy （EDS） analysis showed that the inner coating obtained from the slurry and pack cementation was a C/SiC gradient layer acting as bonding layer, and the exterior coating formed in the second pack cementation was a Si-SiC double phase coating. Oxidation tests at 1873 K in air showed that the coating exhibited excellent oxidation protective ability and thermal shock resistance. The coating could effectively protect C/C composites from oxidation at 1873 K in air for 170 h and undergo the thermal cycling between 1873 K and room temperature for 8 cycles. The weight loss of the coated C/C composites is due to the formation of cracks and holes in the coating and the volatilization of SiO2 glass at high temperature.
ISSN:1005-0302
1941-1162
DOI:10.1016/S1005-0302(11)60014-5