氧化铝纤维含量对Al2O3f＋Cf／ZL109混杂复合材料耐磨性能的影响

利用挤压铸造法制备了Al2O3f Cf/ZL09短纤维混杂金属基复合材料，并探讨了炭纤维体积分数为4％时，Al2O3纤维含量变化对该复合材料耐磨性能的影响。结果表明：随着Al2O3体积分数增加，复合材料的摩擦系数逐渐增大，复合材料从轻微磨损到急剧磨损的临界转变载荷大幅度提高，并随Al2O3含量的增加而逐渐增大；在临界载荷以下，影响复合材料磨损率的Al2O3含量临界值为12％，当Al2O3含量低于临界值时复合材料磨损表面无明显剥落，而当Al2O3含量超过临界值后，复合材料磨损表面存在大量的剥落坑，磨损率增大。

The Effect of Alumina Fiber Volume Fraction on Wear Resistance of Al2O3f+Cf /ZL109 Hybrid Composites

Al 2O 3f +C f/ZL109 short fibers reinforced hybrid metal matrix composites were fabricated by squeeze casting.The effect of Al 2O 3 fiber volume fraction on the wear resistance of the hybrid composites with a fixed carbon fiber volume fraction of 4% was investigated.The morphologies of the worn composite surfaces were observed with a scanning electron microscope. The results showed that the friction coefficient of the hybrid composites in dry sliding against SAE52100 steel increased with increasing Al 2O 3 fiber volume fraction.The combined reinforcing effect of both the Al 2O 3 and carbon short fibers led to a considerable increase of the transition load from mild wear to severe wear of the hybrid composites which rose with increasing Al 2O 3 fiber volume fraction as well.There existed a critical volume fraction of Al 2O 3 fiber below the critical load corresponding to the transition of mild wear to severe one, at which the lowest wear rate of the hybrid composites was recorded. No obvious signs of fiber detachment and peeling off were observed on the worn composite surface when the Al 2O 3 volume fraction was below the critical value 12%, while they were visible when the Al 2O 3 fiber volume fraction was above 12%. This could be attributed to the abrasive action of the wear debris originated from the detached fibers which were more liable to peel off as the Al 2O 3 volume fraction was above the critical value 12%.