Effects of precoating and calcination on microstructure of 3D silica fiber reinforced silicon nitride based composites

• Published in: Transactions of Nonferrous Metals Society of China Vol. 16; no. 4; pp. 824 - 827
• Main Author: 齐共金 张长瑞 胡海峰
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2006; State Key Laboratory of Advanced Ceramic Fibers and Composites, College of Aerospace and Materials Engineering,National University of Defense Technology, Changsha 410073, China
• Subjects: microstructure; preceramic polymer; precoating; silica fiber; silicon nitride based composites; 复合材料; 显微结构; 氮化硅; 石英光纤; 聚合体; 预涂层; preceramic polymer; precoating; microstructure; silicon nitride based composites; silica fiber
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(06)60333-6

Three-dimensional silica fiber reinforced silicon nitride based composites were fabricated by preceramic polymer infiltration and pyrolysis method using perhydropolysilazane as a precursor. The effects of precoating and high temperature calcination on the microstructures of the composites were investigated by scanning electron microscopy. For the composite without a precoating, the fi＇acture surface is plain, and the fiber/matrix interfaces become very unclear after calcination at 1 600 ℃ due to intense interfacial reactions. The composite with a precoating shows tough fracture surface with distinct fiber pull-outs, and the fiber/matrix interfaces are still clear after calcination at 1 600 ℃. It is the appropriate precoating process that contributes to the good interracial microstructures for the composite.