研究了用Al_2O_3溶胶或硅溶胶作粘结剂制备硅酸铝短纤维增强ZL109复合材料的热疲劳性能.结果表明,仅用Al_20_3溶胶作粘结剂制备的复合材料的热疲劳性能最好,仅用硅溶胶作粘结剂制备复合材料的热疲劳性能最差.热疲劳裂纹不是沿纤维与基体之间的界面扩展,就是穿过纤维扩展,且与裂纹扩展方向和纤维的取向有关.随着热循环次数的增加,上述复合材料的硬度逐渐下降. The thermal fatigue properties of ZL109 composite reinforced with Al 2 O 3 sol or silica sol as binder were studied. The results show that the composite prepared with Al 2 O 3 sol only has the best thermal fatigue property, and only The thermal fatigue properties of the composites prepared by using silica sol as the binder are the worst.The thermal fatigue cracks are not extended along the interface between the fibers and the matrix or through the fibers and are related to the direction of the crack growth and the orientation of the fibers. The number of thermal cycles increases, the hardness of the composite material gradually decreased.