期刊
JOURNAL OF COMPOSITES SCIENCE
卷 4, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/jcs4030086
关键词
carbon; carbon composites; multi-phase coatings; oxidation resistance; thermal cycling
资金
- National Natural Science Foundation of China [51573087]
- Natural Science Foundation in Shandong Province [ZR2014EZ001, ZR2011EMM002]
To improve the oxidation resistance of carbon/carbon composites at high temperatures (>1770 K), they were coated with MoSi2-Si3N4/SiC. The slurry and pack cementation methods were adopted to deposit the inner SiC layer and outer MoSi2-Si(3)N(4)layer. The phase composition, microstructure, and elemental distributions in the coating were analyzed using SEM, XRD, EDS, and Raman spectroscopy. Oxidation tests show that the deposited multi-layer coating can protect the carbon/carbon matrix from oxidation at high temperatures (>1770 K) for 150h and that the coating can withstand 40 thermal cycles between 1773 and 300 K. It is observed that Si(3)N(4)assists in the formation of a dense SiO(2)layer at a high temperature, which plays a vital role in increasing the thermal cyclic and oxidation resistance of the coating itself. The weight loss of coated carbon/carbon composite is attributed to the formation of micro-cracks and diffusion of SiO2, MoO3, and N(2)out of the material at high temperatures.
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