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采用T6态的SiCp/A356复合材料,以Al2O3陶瓷球作为对磨材料,借助UMT-2摩擦磨损实验机详细研究了复合材料的高温摩擦磨损性能,并采用SEM、OLS4000等手段分析材料的高温摩擦磨损特性。结果表明:T6态的SiCp/A356复合材料的磨损率随着温度的增加而增加。当温度低于150℃时,磨损率随温度缓慢增加;继续升高温度,磨损率进入稳定阶段,稳定磨损率为3.18×10-5 mg·cm-1;当温度达到250℃时,磨损率呈线性上升。摩擦系数则随温度在0.40~0.45很小范围内波动,表现出优异的高温摩擦性能。同时,磨损机制由氧化磨损、磨粒磨损和疲劳磨损转变为严重的粘着磨损。
SiCp / A356 composites with T6 state and Al2O3 ceramic balls were used as the wear-resisting materials. The friction and wear properties of the composites were studied in detail by UMT-2 friction and wear tester. SEM and OLS4000 were used to analyze the high-temperature friction Wear characteristics. The results show that the wear rate of SiCp / A356 composites increases with the increase of temperature. When the temperature is lower than 150 ℃, the wear rate increases slowly with the increase of temperature. When the temperature continues to increase, the wear rate reaches a steady state with a steady wear rate of 3.18 × 10-5 mg · cm-1. When the temperature reaches 250 ℃, the wear rate Rising linearly. The coefficient of friction then fluctuates within a small range of 0.40 to 0.45 with temperature, exhibiting excellent high-temperature frictional properties. At the same time, the wear mechanism changes from oxidative wear, abrasive wear and fatigue to severe adhesive wear.