材料科学
复合材料
热解炭
微观结构
抗弯强度
增强碳-碳
纤维
极限抗拉强度
复合数
碳纤维
石墨
微晶
热解
冶金
化学工程
工程类
作者
Jianjie Hao,Jiayan Li,Xiao‐Lei Shi,Ping He,Wei Shi,Yi Tan
标识
DOI:10.1016/j.matchar.2022.112334
摘要
The changes in microstructure and mechanical properties of the carbon fiber and their effects on C/SiC composites were studied. The H, N and O atoms escaped and the carbon content in the carbon fiber increased when the heat treatment temperature exceeds 1200 °C. Meanwhile, the growth of graphite crystallite leaded to stress concentration and reduced the tensile strength of carbon fiber to 2.98 GPa by 1200 °C heat treatment. The active atoms on the surface of the carbon fiber were reduced, thus weakening the bonding force between the carbon fiber and the pyrolytic carbon interface layer and improving the pullout mechanism of the carbon fiber. This result was also observed by synchrotron radiation X-ray computed tomography. The flexural strength of the C/SiC composite increased from 300 MPa without treatment to 364 MPa after 1600 °C heat treatment.
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