SiCp/A356复合材料高温干滑动摩擦磨损特性研究

借助UMT-2型摩擦磨损试验机详细研究了转速对 SiCp/A356复合材料干滑动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高温摩擦磨损行为。结果表明：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，表现出优异的摩擦性能。铸态材料的磨损机理主要由低转速时的氧化磨损和剥离磨损转变为高转速时的粘着磨损，而T6态材料主要由低转速时的氧化磨损转变为高转速时的剥离磨损和磨粒磨损。高转速区时，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。

Research on the High temperature Dry Sliding Friction and Wear Characteristics of SiCp/A356 Composite

The effect of velocity on the dry sliding friction and wear characteristics of SiCp/A356 composite was investigated in detail on UMT-2 tribometer. The high temperature friction and wear behavior of the composite were analyzed by SEM, EDS and Olympus confocal laser scanning microscope. The results reveal that the wear rate of as-cast material is increased greatly and its friction coefficient fluctuates within a large range. On the contrary, the increasing degree of the wear rate and the friction coefficient of T6 material is low, which shows excellent friction behavior. the oxidation wear and stripping wear at low velocity of as-cast material is mainly shifted to adhesive wear at high velocity. However, the oxidation wear at low velocity of T6 material is mainly shifted to stripping wear and adrasive wear at high velocity. At high velocity, the crack appears obviously in the cross-section of worn surface of 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.