Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 14    No. 3    June 2004

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Mechanical properties of Cf/Si-O-C composites prepared
by hot-pressing assisted pyrolysis of polysiloxane
MA Qing-song(马青松), CHEN Zhao-hui(陈朝辉), ZHENG Wen-wei(郑文伟),
 HU Hai-feng(胡海峰)

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

Abstract:Silicon oxycarbide composites reinforced by three-dimensional braided carbon fiber (3D-B Cf/Si-O-C) were fabricated via precursor infiltration and pyrolysis of polysiloxane, and the effects of processing variables on mechanical properties and microstructures of 3D-B Cf/Si-O-C composites were investigated. It is found that the mechanical properties and densities of 3D-B Cf/Si-O-C composites can be increased if the first pyrolysis cycle is assisted by hot-pressing. Pyrolysis temperature has great effects on mechanical properties and microstructures of 3D-B Cf/Si-O-C composites. The composite, which is hot-pressed at 1 600℃for 5 min with pressure of 10 MPa in the first pyrolysis cycle, exhibits high mechanical properties: bending strength 502 MPa and fracture toughness 23.7 MPa·m1/2. The high mechanical properties are mainly attributed to desirable interfacial structure and high density.


Key words: silicon oxycarbide; continuous carbon fiber reinforcement; mechanical property; microstructure; precursor

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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