Three－Dimensional Carbon Fiber Reinforced SiC Composites Fabricated Via Polymer Pyrolysis Assisted by Hot

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Three－Dimensional Carbon Fiber Reinforced SiC Composites Fabricated Via Polymer Pyrolysis Assisted by Hot－Pressing

FANG Hui, ZHENG Wenwei, CHEN Zhaohui

（National University of Defense Technology）

Abstract: Three－dimensional braided carbon fiber（3D－BC_f）reinforced silicon carbide（SiC） composites were fabricated via precusor infiltration and phyrolysis using polycarbosilane．The density and mechanical properties of 3D－BC_f/SiC could be increased markedly if the first pyrolysis cycle was assisted by hot－pressing．The flexural strength and the fracture toughness of the composite which was hot－pressed at1600℃ for60min with a pressure of 10 MPa in the first pyrolysis cycle and treated subsequently with five cycles of vacuum infiltration and pyrolysis under atmospheric pressurewere564MPa and16．0MPa·m^1/2respectively．The effect of processing on microstructure and properties was discussed．

Keywords: silicon carbidepolymer pyrolysishot pressthree－dimensional braided carbon fiberceramic matrix composites

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