Synthesis of a novel preceramic polymer (V-PMS) and its performance in heat-resistant organic adhesives for joining SiC ceramic

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• 作者：Xiaozhou Wang ; ^{wangler2002@163.com} ; Jun Wang ; Hao Wang
• 关键词：Heat-resistant adhesive ; Joining ; SiC ; Thermal properties ; Mechanical properties
• 刊名：Journal of the European Ceramic Society
• 出版年：2012
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：September, 2012
• 卷：32
• 期：12
• 页码：3415-3422
• 文件大小：1900 K

摘要

Heat-resistant organic adhesives are urgently needed for aeronautical and astronautical applications, and there have been only a few successful studies in this field. In this work, a novel preceramic polymer (V-PMS) has been synthesized by modifying polymethylsilane with 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, [CH₃(CH₂CH)SiO]₄, and this has been used as a heat-resistant adhesive. The obtained adhesive was found to exhibit outstanding thermal and bonding properties. The ceramic yield was about 81%(in Ar) and 90.6%(in air) at 1200 掳C. The shear strength was 14.9 MPa at room temperature, and this increased to a maximum of 31.7 MPa after treatment at 1000 掳C for 2 h in air. Moreover, it was interesting to find that on addition of B₄C powder to the preceramic polymer, its shear strength was surprisingly enhanced up to 50.8 MPa after annealing at 1200 掳C under air atmosphere. Their excellent performances make the obtained adhesives promising candidates for joining SiC ceramics in high-temperature applications.