SiC纤维表面改性对SiC_w／Al复合材料界面强度的影响

EFFECT OF SURFACE TREATMENTS OF SiC FIBER ON THE INTERFACE STRENGTH BETWEEN SiC FIBER AND AI MATRIX

用ＳｉＯ_２，Ｃ对ＳｉＣ纤维进行表面处理后制备成ＳｉＣ_ｗ／Ａｌ复合材料，对其拉伸形变断裂过程的声发射行为进行了研究，并测定了纤维断裂强度和纤维基体间的界面切变度．结果表明界面切变强度、纤维断裂强度和界面性能对纤维的表面处理十分敏感，富ＳｉＯ_２处理的ＳｉＣ纤维的界面性能得到改善，而富碳处理的界面变脆．

Acoustic emission(AE) behaviors of SiC_w /Al composites in which the surface of SiC fiber was and not treated by SiO_2 and C respectively, have been studied during tensile testing. The fiber strength and the interface shear strength between fiber and matrix have been measured by AE technique. It is found that the interface shear strength and the fiber fracture strength as well as the interface properties are sensitive to the surface treatments of fiber. The SiC_w / Al composite made of SiC treated by SiO_2 possesses the better interface properties, whereas, the composite made of SiC treated by C has the brittle interface.