期刊
CORROSION SCIENCE
卷 207, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110559
关键词
Carbon/carbon composites; Coating; Oxidation resistance; Medium and high temperature
资金
- National Natural Science Foundation of China [52130205, 51727804, 91860203]
- National Key Research and Development Program of China [2021YFA0715803]
A HfB2-SiC skeleton was designed using hollow SiO2 microspheres as sacrificial templates on SiC-coated C/C composites. The skeleton was densified by SiC via chemical vapor infiltration to fabricate a dense SiC-HfB2 oxidation protective coating. The uniform distribution of HfB2 in the coating enhanced its effectiveness in covering cracks in the SiC inner coating. Hf-oxides contributed to the stability and inhibition of SiO2 volatilization in the compound glass layer. The coating exhibited excellent oxidation protection for C/C composites under high temperatures.
A HfB2-SiC skeleton was designed on SiC-coated C/C composites using hollow SiO2 microspheres as sacrificial templates, which was densified by SiC via chemical vapor infiltration to fabricate a dense SiC-HfB2 oxidation protective coating. In this way, the uniform distribution of HfB2 in the coating was realized. Cracks in the SiC inner coating were covered by the SiC-HfB2 coating; Hf-oxides improved the stability and inhibited the volatilization of SiO2 in the compound glass layer. Therefore, the coating can protect C/C composites against oxidation for 59 hat 1473 K, 503 hat 1773 K, and 166 h at 1973 K.
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