摘要
碳纤维平纹编织物和穿透厚度的碳纤维Z-pins制作的预成型体,通过化学气相渗透工艺制备了Z-pins增强平纹编织C/SiC复合材料。采用双缺口剪切压缩试验测定了Z-pins增强平纹编织C/SiC复合材料的层间剪切强度,通过断口的电镜照片分析了层间剪切的破坏机理。研究了Z-pins个数对层间剪切强度的影响。结果表明:与未增强陶瓷基复合材料相比较,当Z-pins个数达到一定数量时,Z-pins插入能够提高层间剪切强度,层间剪切强度随Z-pins个数的增多而增加。Z-pins插入改变了陶瓷基复合材料的层间破坏机理,使层间织物与基体的脱离变为Z-pins的剪切破坏和层间织物与基体脱离的双重破坏机制。
A preform consisting of plain-woven carbon fabric and Z-pins made of through-thickness carbon fiber bundles was prepared and then the Z-pin reinforced plain-woven C/SiC composite was fabricated by a chemical vapor infiltration.Double-notched shear compression tests and scanning electron microscopy were used on Z-pin reinforced plain-woven C/SiC ceramic matrix composite to measure interlaminar shear strength and to analyze fracture mechanism of the interlaminar shear,respectively.Effect of the number of Z-pins on interlaminar shear strength was studied.The results show that the insertion of Z-pins improves interlaminar shear strength when the number of Z-pins reached a certain quantity comparing with the ceramic matrix composites without Z-pins,and interlaminar shear strength increases as the number of Z-pins increases.Z-pins change the interlaminar fracture mechanism of the ceramic matrix composites into a double fracture mechanism of Z-pin shear fracture and debonding of fabric and matrix of interlaminar.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2009年第5期664-667,共4页
Journal of Materials Science and Engineering
基金
Supported by Specialized Research Fund for the Doctoral Program of Higher Education of China(20030699040).
关键词
陶瓷基复合材料
层间剪切强度
双缺口剪切试验
ceramic matrix composite
interlaminar shear strength
double-notched shear test