Increasing the strength and toughness of a carbon fiber/silicon carbide composite by heat treatment

被引：76

作者：

Mei, Hui ^{[1
]}

Li, Haiqing ^{[1
]}

Bai, Qianglai ^{[1
]}

Zhang, Qing ^{[1
]}

Cheng, Laifei ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Sci & Technol Thermostruct Composite Mat Lab, Xian 710072, Shaanxi, Peoples R China

来源：

CARBON | 2013年 / 54卷

关键词：

RESIDUAL-STRESS; MICROSTRUCTURE; FIBER; CVI;

D O I：

10.1016/j.carbon.2012.11.001

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effect of heat treatment on the strengthening and toughening of a carbon fiber/silicon carbide composite (C/SiC) with a thin pyrolytic carbon (PyC) interphase was investigated. Tensile strength and modulus were measured using tensile tests, and toughness was obtained by calculating the area under the stress-strain curves. Results show that with increasing heat treatment temperature both the strength and toughness of the C/SiC composite increased, but the modulus decreased. After heat treatment at 1900 degrees C the tensile strength and toughness increased by a maximum of 42% and 252%, respectively, and the modulus decreased by 48%. X-ray diffraction analysis and microstructural observation confirmed that the heat treatment mainly increased the graphitization of the amorphous PyC interphase, and this was responsible for the property changes observed because it decreased the interfacial sliding resistance associated with long fiber pull-out, relieved the thermal residual stress and lower stress concentrations on the fibers to uniformly share the load for improving the strength and toughness. (c) 2012 Elsevier Ltd. All rights reserved.

引用

页码：42 / 47

页数：6

共 16 条

[1] Effect of high temperature heat treatment in vacuum on microstructure and bending properties of SiCf/SiC composites prepared by CVI [J].