期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 95, 期 1, 页码 71-74出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1551-2916.2011.04972.x
关键词
-
资金
- Shanghai Leading Academic Discipline Projects [B502]
A novel oxidation resistant SiC/B4C/C nanocomposite was prepared by the pyrolysis of carborane-containing poly(silyleneethynylenephenyleneethynylene) (CB-PSEPE) at 1450 degrees C in argon. The phase composition and microstructure of the carbon-rich ceramic were investigated by X-ray diffraction, Raman spectroscopy and transmission electron microscopy. The beta-SiC (similar to 12 similar to nm) and B4C (similar to 20 similar to nm) nanocrystalline phases were formed during the pyrolysis process of CB-PSEPE. The presence of boron in CB-PSEPE promotes the growth of beta-SiC nanocrystals. The ceramic shows excellent thermooxidative stability based on thermogravimetric analysis in air. A borosilicate layer was formed on the surface of the ceramic after oxidation. This carborane-containing conjugated polycarbosilane could be a potential precursor for oxidation resistant carbon-based materials.
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