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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。
Z-pins reinforced plain weave C / SiC composites were prepared by chemical vapor infiltration process using carbon fiber plain weave and through-thickness carbon fiber Z-pins. The interlaminar shear strength of Z-pins reinforced plain-woven C / SiC composites was measured by double-notched shear compression test. The failure mechanism of interlaminar shear was analyzed by electron micrograph. The influence of the number of Z-pins on the interlaminar shear strength was studied. The results show that the number of Z-pins can increase the interlaminar shear strength when the number of Z-pins reaches a certain amount, compared with the non-reinforced ceramic matrix composites. The interlaminar shear strength increases with the number of Z-pins increase. The insertion of Z-pins changed the mechanism of interlayer failure of ceramic matrix composites, and the delamination of the interlaminar fabric from the matrix changed into the failure mechanism of the Z-pins and the delamination of the interlaminar fabrics from the matrix.