Al_2O_3纤维及炭纤维增强ZL109混杂复合材料的高温摩擦磨损性能研究  

The Friction and Wear Properties of Al-12Si Hybrid Composites Reinforced with Alumina and Carbon Short Fibers at Elevated Temperature

作　　者：杜军[1] 刘耀辉[1] 于思荣[1] 王威[2] 

机构地区：[1]吉林大学汽车材料教育部重点实验室 [2]黑龙江工程学院材料工程系,黑龙江哈尔滨150500

出　　处：《摩擦学学报》2003年第3期206-210,共5页Tribology

基　　金：吉林省科技厅资助项目(963543).

摘　　要：利用预制体挤压浸渗法制备了Al2O3+Cf/ZL109短纤维混杂金属基复合材料,并探讨了炭纤维含量对该混杂复合材料高温(400℃)下的摩擦磨损性能的影响.结果表明:混杂炭纤维的复合材料具有优异的高温耐磨性能;由于12%Al2O3和4%C短纤维的协同作用,复合材料从轻微磨损向急剧磨损转变的临界温度比基体合金的提高了1倍;混杂复合材料的摩擦系数和磨损率随着炭纤维体积分数的升高而不断减小,这在较高温度(300℃)下更加明显;在较低温度下,基体及复合材料的磨损机制主要为犁沟磨损和轻微粘着磨损,当温度超过临界温度后,磨损机制转变为严重粘着磨损.Al12Si aluminum alloy hybrid composites reinforced with alumina and carbon short fibers were fabricated by squeeze casting.The effect of carbon fibre volume fraction on the friction and wear properties of the hybrid composites at elevated temperature (400 ℃) was investigated on an MG2000 high temperature friction and wear tester.The wear mechanisms of the alloy matrix and the hybrid composite were discussed based observation of the worn surface morphologies with a scanning electron microscope. The results showed that the hybrid composites had much better frictionreducing and wearresistant behaviors than the alloy matrix and the Al12Si composite reinforced with alumina fibre alone.The incorporation of the hard ceramic Al2O3 fiber led to a considerable increase of the critical transition temperature from mild wear to severe one, while such a transition temperature was further increased with the hybridization of the short carbon fiber, owing to the synergistic effect of the ceramic fiber and the carbon fiber. This was attributed to the selflubricating ability of the detached carbon fiber as the wear debris. The improvement in the frictionreducing and antiwear ability of the hybrid composite became more prominent at elevated temperature of 300 ℃. The alloy matrix and the hybrid composites were dominated by ploughing and slight adhesion in sliding against SAE52100 steel at temperature below the critical transition temperature, while they were dominated by severe adhesion as the test temperature surpassed the critical transition temperature.

关 键 词：金属基混杂复合材料 高温磨损性能 磨损机制 碳纤维 AL2O3纤维 

分 类 号：TB331[一般工业技术—材料科学与工程] TH117.1[机械工程—机械设计及理论]