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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 4    August 2006

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Effects of precoating and calcination on microstructure of 3D silica fiber reinforced silicon nitride based composites
QI Gong-jin(齐共金), ZHANG Chang-rui(张长瑞), HU Hai-feng(胡海峰)

State Key Laboratory of Advanced Ceramic Fibers and Composites,
College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China

Abstract: 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 fracture 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 interfacial microstructures for the composite.

 

Key words: silica fiber; precoating; preceramic polymer; silicon nitride based composites; microstructure

ISSN 1672-7029
CN 43-1423/U

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