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在高温高压下,通过金属浸渗法将熔融的金属铜和铝压铸到多孔碳基体中制备出C/Cu和C/Al复合材料。采用往复式摩擦试验机进行干摩擦磨损试验,研究载荷、滑动速度对复合材料磨损率的影响,通过SEM、EDS探究复合材料的磨损表面形貌和成分。结果表明:材料的磨损率随载荷和速度的增加而上升。与C/Al复合材料相比,C/Cu复合材料的摩擦系数较高但磨损体积较小。随载荷的增加,C/Cu和C/Al复合材料的摩擦系数先增后降,并在5N载荷下分别达到最大值0.228和0.206。随速度的增加,C/Al复合材料的摩擦系数先降后升,并在0.05m/s时达到最小值0.155;而C/Cu复合材料的摩擦系数变化并不明显。经过分析,复合材料的磨损机制包括磨粒磨损、粘着磨损和疲劳破坏。氧化磨损仅发生在C/Al复合材料的滑动过程中。
Under high temperature and high pressure, C / Cu and C / Al composites were prepared by die-casting molten metal copper and aluminum into porous carbon matrix by metal infiltration method. Dry friction and wear tests were carried out on a reciprocating friction tester to study the influence of load and sliding speed on the wear rate of the composite. SEM and EDS were used to investigate the wear surface morphology and composition of the composite. The results show that the wear rate increases with the increase of load and velocity. Compared with C / Al composites, C / Cu composites have higher friction coefficient but smaller wear volume. With the increase of load, the friction coefficient of C / Cu and C / Al composites increases first and then decreases, and reaches the maximum value of 0.228 and 0.206 under 5N load respectively. With the increase of speed, the friction coefficient of C / Al composites decreased first and then increased, reaching the minimum value of 0.155 at 0.05m / s. However, the friction coefficient of C / Cu composites did not change obviously. After analysis, the wear mechanism of composite materials includes abrasive wear, adhesive wear and fatigue damage. Oxidative wear occurs only in the sliding of C / Al composites.