【摘要】 借助UMT-2型摩擦磨损试验机详细研究了干滑动速度对SiC_p/A356复合材料摩擦磨损特性的影响,并用SEM、EDS和奥林巴斯激光共焦扫描显微镜观察并分析了其摩擦磨损行为。结果表明:随着干滑动速度的增加,铸态材料的磨损率增加幅度和摩擦系数曲线波动较大;T6态材料的磨损率增加幅度和摩擦系数曲线波动较小,表现出优异的耐摩擦性能。铸态材料的磨损机理主要由低速时的氧化磨损和剥离磨损转变为高速时的粘着磨损,而T6态材料主要由低速时的氧化磨损转变为高速时的剥离磨损和磨粒磨损。高速区时,铸态材料的磨损断面中出现裂纹,而T6态材料只是存在简单的磨削痕迹和颗粒脱落现象。热处理后复合材料的高温耐磨性能明显提高。更多还原

【Abstract】 The effect of dry sliding velocity on the friction and wear characteristics of SiC_p/A356 composite was investigated on UMT-2 tribometer. The friction and wear behavior of the composite were analyzed by SEM, EDS and Olympus confocal laser scanning microscope. The results reveal that with the increasing of dry sliding velocity the wear rate of the as-cast material increases greatly and its friction coefficient fluctuates within a large range. On the contrary, for T6 material the wear rate increases slightly and the friction coefficient fluctuates in a narrow range, which shows excellent friction behavior. The oxidation wear and stripping wear of as-cast material at low velocity is mainly shifted to adhesive wear at high velocity. However, the oxidation wear of T6 material at low velocity is mainly shifted to stripping wear and abrasive wear at high velocity. At high velocity, cracks appear obviously in the cross-section of the worn as-cast material, but there are only simple grinding traces and particle shedding in T6 material. Therefore, high temperature wear resistance of the composite has been improved significantly after heat treatment.更多还原