硅酸铝短纤维对其增强 ZL109 复合材料摩擦因数影响的双重性

Dual Effects of AluminaSilica Short Fiber on Friction Factor of Reinforced ZL109 Composites

采用预制件液态模锻法制备了硅酸铝短纤维增强的ＺＬ１０９复合材料，并以合金球墨铸铁为偶件，在干摩条件下于ＭＧ－２０００高速高温摩擦磨损试验机上，对复合材料的摩擦性能进行了试验研究，考察了硅酸铝短纤维的添加量对这种材料摩擦因数的影响．结果表明，随着纤维添加量（以体积分数计）由０．０％增至７．０％，复合材料摩擦因数的变化是先降低而后升高，纤维添加量为４．５％时的摩擦因数呈现出最低值，而纤维添加量为７．０％时复合材料的摩擦因数与基体的基本相当．在用扫描电子显微镜对磨损表面形貌观察的基础上，着重讨论了硅酸铝短纤维对复合材料摩擦因数影响的双重性，指出这种双重性影响导致纤维含量较低时，纤维分布于磨损表面有利于复合材料摩擦因数的降低，而当纤维含量较高时则使复合材料的摩擦因数升高．

Aluminasilica short fibers reinforced ZL109 composites were prepared, and the alloy ductile iron is used for friction coupling, the friction properties were investigated under the dry friction condition using model MG2000 highspeed and hightemperature frictionwear tester, and the effects of fiber on the friction factor of composites were also studied.The results showed that with the increament of fiber addition content (from 0 to 7.0%, in accordance with volume), the change pattern of friction factor of composite is as follows: first decreasing and then, increasing. The friction factor is the lowest value when the fiber addition volume is 4.5%; Whereas the friction factor of composites is similar to that of matrix alloy,when the fiber addition volume is 7.0%. On the basis of surface morphology observation with SEM, the dual effects of fiber on the friction factor of composites were discussed and pointed out that the dual effects are advantageous to decreament of friction factor of composites due to the content of fiber is lower, and when the content of fiber is higher, the friction factor of composites increases.