Mechanical properties of C_f/Si-O-C composites prepared by hot-pressing assisted pyrolysis of polysiloxane

来源期刊：中国有色金属学报(英文版)2004年第3期

论文作者：马青松 陈朝辉 郑文伟 胡海峰

文章页码：480 - 484

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

Abstract: Silicon oxycarbide composites reinforced by three-dimensional braided carbon fiber (3D-B C_f/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 C_f/Si-O-C composites were investigated. It is found that the mechanical properties and densities of 3D-B C_f/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 C_f/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·m^1/2. The high mechanical properties are mainly attributed to desirable interfacial structure and high density.