Effects of Environments on Wear Resistance of SiC-Whisker-Reinforced Aluminum Composite

采用销-盘磨损试验（销：0.45%碳钢，盘：FRM），研究了环境对SiC晶须增强铝合金（基体材料：2024 Al，晶须体积分数：22%，简称FRM）在不同相对湿度的大气和氩气中的磨损性能的影响.对于未增强的基体材料（2024 Al），无论相对湿度如何，都会发生严重的磨损，而对于FRM.2，在每个RH下都不会发生严重磨损。2024铝的轻度磨损率随相对湿度的增加而显著增大，而FRM的轻度磨损率则随相对湿度的增加而略有增加; 2024铝的磨损表面由于吸湿而强度降低，磨粒变大，磨损率增加。对于FRM，由于基体材料在水分的作用下容易断裂，磨损颗粒数量增加，尺寸减小，因此轻度磨损率随RH的增加略有不同.在氩气中，2024铝和FRM的轻度磨损率均小于大气中的磨损率。这些材料受水分的影响很大，而不是氧气。在大气和氩气中，FRM的摩擦系数大于2024 Al的摩擦系数，表明环境湿度对铝基复合材料的耐磨性没有影响。

The effects of environments on wear properities of SiC-Whisker-reinforced Aluminum alloy (matrix material : 2024Al ; volume fraction of the whisker : 22%, designated as FRM) were investigated by pin-on-disk tests (pin : 0.45% carbon steel, disk : FRM) in atmosphere and argon gas with various relative humidities.1. The severe wear occured regardless of relative humidity for unreinforced matrix material (2024Al), but didn't occur at every RH for FRM.2. The mild wear rate becomes larger remarkably with an increase of RH for 2024Al, but increase a little from RH=70% for FRM.For 2024Al, since the strength of worn surface decreases because of the adsorption of moisture, wear particle becomes larger and consequently wear rate increases. For FRM, wear particle increases in number but decreases in size because the matrix material is easy to fracture due to the action of moisture, so that mild wear rate slightly differs as RH increases.3. In argon gas, the mild wear rates of both 2024Al and FRM are smaller compared with those in atmosphere. These materials are much affected by moisture rather than oxygen.4. The coefficient of friction of FRM is larger than those of 2024Al in atmosphere and argon gas.From these results, it is found that the wear resistance of aluminum matrix composite is not influenced by moisture in environment.