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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。
The effects of dry sliding velocity on the tribological properties of SiCp / A356 composites were studied in detail by UMT-2 friction and wear tester. The tribological behavior of SiCp / A356 composites was also investigated by SEM, EDS and Olympus laser confocal scanning microscope. The results show that with the increase of dry sliding velocity, the increase rate of the wear rate and the friction coefficient curve of the as-cast material fluctuate greatly. The increase of the wear rate and the friction coefficient curve of the T6 material show little fluctuation and exhibit excellent tribological properties . The wear mechanism of as-cast material is mainly changed from oxidation wear and peel wear at low speed to adhesive wear at high speed, while T6 material changes from oxidation wear at low speed to peel wear and wear wear at high speed. In the high speed zone, cracks appear in the worn section of the as-cast material, whereas the T6 state material has only simple grinding marks and particles shedding. After heat treatment, the wear resistance of the composite material is obviously improved.