Preparation and Properties of SiC Nanocrystallite Reinforced Amorphous Si–B–C–N Ceramics

Abstract:

Amorphous Si–B–C–N ceramics synthesized by polymer thermolysis possess excellent chemical, thermal and mechanical stability at high temperature. Many attentions have been devoted to study the crystallization and stability of Si–B–C–N ceramics. The SiC nanocrystallite reinforced amorphous Si–B–C–N ceramics have been fabricated by pyrolysis of single-source precursors at high temperature. The heat-treatment at high temperature commonly impaired the thermal stability of the composites. Crack and pore limit the development of the composites. New processing routes that overcome those problems are desirable. Here we reported the thermolysis of binary-source precursors mixed by polycarbosilane and boron-modified polyvinylsilazanen to fabricate Si–B–C–N composites with relative densities up to 96%. Green bodies were obtained by compaction of precursors using warm pressing at different temperature. The obtained composites were characterized by Scanning Electron Microscope and X-ray Diffraction.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 785-788
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.785
• Online since: June 2012
• Authors: Xia Huang, Ya Jing Li, Song Li, Xiao Xia Tang, Yue Zhang
• Keywords: Annealing Temperature, Si-B-C-N Ceramics, SiC Nanocrystallite

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