文献类型：期刊文献

英文题名：A linear polycarbosilane containing m-carborane units: Synthesis and characterization as precursor for SiC/B₄C ceramics

作者：Zhou, Quan[1];Peng, Zhengqiang[1];Yang, Mingze[1];Hu, Hao[1];Song, Ning[1];Ni, Lizhong[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tec, Minist Educ, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2018

卷号：30

期号：10

起止页码：1267

外文期刊名：HIGH PERFORMANCE POLYMERS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000452326200013)】；

基金：The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This study is supported by the Natural Science Foundation of China (51573044) and the Shanghai Natural Science Foundation of China (15ZR1409800).

语种：英文

外文关键词：Poly(carborane)(silicon-acetylene); m-carborane; precursor; SiC/B4C ceramic; oxidation-resistant

摘要：The precursor of poly(carborane)(silicon-acetylene) (PCBS) for silicon carbide (SiC)/B4C composite ceramics was synthesized by a salt metathesis reaction. The molecular weight of PCBS was measured by gel permeation chromatography and the corresponding structures were identified by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR). After thermal curing, the PCBS was converted to a dark red brittle nonporous monolith and the thermal stability was significantly improved, especially in an air atmosphere. Thermogravimetric analysis indicated that the 5% weight loss temperatures were 595 degrees C and 633 degrees C under nitrogen and air atmospheres, respectively, and the corresponding residues at 1000 degrees C were 86.42% and 90.42%. After a heat treatment at 1600 degrees C under inert atmosphere, the well-dispersed SiC/B4C ceramic was obtained and characterized by FTIR, X-ray diffraction analysis, Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The obtained SiC/B4C ceramic has a good high-temperature and oxidation resistance which can be applied to aviation, aerospace, and other ultra-high temperature conditions.