摩擦磨损性能的影响
(1. 吉林大学 材料科学与工程学院， 长春 130025;
2. 长春三佳化油器有限公司， 长春 130117)
摘 要: 利用挤压铸造法制备了Al2O3+C/ZL109短纤维混杂金属基复合材料，并探讨了Al2O3纤维体积分数为12%时，C纤维含量对该混杂复合材料摩擦磨损性能的影响。结果表明：随着C纤维体积分数的增加，复合材料的摩擦因数和磨损率逐渐降低。12％Al2O3和4％C短纤维的协同作用使复合材料从轻微磨损到急剧磨损的临界转变载荷比基体合金提高了１倍。当载荷低于临界载荷时，复合材料的主要磨损机制为犁沟磨损和层离，C纤维的加入有利于磨损表面裂纹尺寸的减小。但随着载荷的逐渐增加并发生严重磨损时，基体和复合材料的磨损机制均为严重的粘着磨损甚至局部熔化磨损。
关键字: 金属基复合材料； 混杂； 摩擦磨损； 碳短纤维
Al2O3+C /ZL109 hybrid composites
（１. School of Materials Science and Engineering,
Jilin University， Changchun 130025， China;
2. Changchun San Jia Carburetor Limited Corporation， Changchun 130117， China）
Abstract:Al2O3+C/ZL109 short fibers reinforced hybrid metal matrix composites were fabricated by squeeze casting．The effect of carbon fiber content on friction and wear properties of the hybrid composites with fixed Al2O3 fiber volume fraction 12% was investigated．The results show that carbon fiber is of self-lubricant to some degree， coefficient of friction and wear rate of the hybrid composites decrease with the increase of carbon fiber volume fraction．Tribological property of the hybrid composites with incorporation of carbon short fiber is ameliorated and the wear property is improved．The transition load from mild wear to severe wear of the hybrid composites improves markedly because of mutual effect of Al2O3 and carbon short fibers， the value is larger by one fold than that of the matrix． The dominant wear mechanisms of the composites are grooving and delamination during the phase of mild wear when the experimental load is smaller than the transition load．Incorporation of carbon short fiber is in favor of decrease of microcracks size on worn surface． The dominant wear mechanisms of matrix and composites will be shifted to severe adhesion and even local melt wear with the increase of load．
Key words: metal matrix composites; hybrid; friction and wear; carbon short fiber
