对3D-C/SiC复合材料进行拉伸蠕变试验,蠕变进行一段时间后,用扫描电子显微镜(SEM)观察试样表面的变化,同时测量试样的共振频率.结果表明,3D-C/SiC除通常CMC所产生的蠕变损伤外,纤维束滑动,纤维束之间的夹角变化,孔隙变形,部分孔隙表面空间位置改变,孔隙表面产生基体微裂纹,损伤在纤维束交叉处更为集中,这些可作为3D-C/SiC蠕变变形的独特机理.电阻和模量的相对变化与蠕变曲线相似,因此电阻和模量都可表征C/SiC材料的蠕变损伤,作为损伤变量.该材料的蠕变属于损伤引起.
参考文献
[1] | Richard E. Tressler .Recent developments in fibers and interphases for high temperature ceramic matrix composites[J].Composites, Part A. Applied science and manufacturing,1999(4):429-437. |
[2] | GuigonM .Relationship between microstructure and mechanical and electrical properties of ex- polyacrylonitrile carbon fiber[D].Université de Technologie de Compiégne,1985. |
[3] | Holmes J W;Chermant J L.Creep behavior of fiber-reinforced ceramic matrix composites[A].Cambridge:Woodhead Publishing,1994:633-647. |
[4] | ZHU S;Mizuno M;Kagawa Y;Mutoh Y .Monotonic tension, fatigue and creep behavior of SiC-fiber-reinforced SiC-matrix composites: a review[J].Computing in Science and Engineering,1999,59:833-851. |
[5] | Sines G;Yang Z .Creep of carbon yarn and a carbon-carbon composite at high temperatures and high stress[J].CARBON,1989,127:403-415. |
[6] | Boiter G;Chermant J L;Cubero H.CMC creep mechanism under argon[A].WILEYVCH Verlag GmbH,D-69469 Weinheim,2001:492-497. |
[7] | Boitier G;Chermant J L;Vicens J .Multiscale investigation of the creep behavior of 2.5D Cf-SiC composition[J].Journal of Materials Science,1999,34:2759-2767. |
[8] | Boitier G;Vicens J;Chermant J L .Nanostructure study by TEM and HREM of carbon fiber in Cf-SiC composites[J].Journal of Materials Science Letters,1997,16:1402-1405. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%