AA6061/ZrB2原位复合材料的干滑动磨损行为

摘要

The dry sliding wear behavior of AA6061/ZrB2 in-situ composite prepared by the reaction of inorganic salts K2ZrF6 and　KBF4 with molten aluminum was investigated.An attempt was made to develop a mathematical model to predict the wear rate of　AA6061/(0-10％) ZrB2 in-situ composites.Four-factor,five-level central composite rotatable design was used to minimize the　number of experiments.The factors considered are sliding velocity,sliding distance,normal load and mass fraction of ZrB2 particles.The effect of these factors on the wear rate of the fabricated composite was analyzed and the predicted trends were discussed by　observing the wear surface morphologies.The in-situ formed ZrB2 particles enhance the wear performance of the composite.The　wear rate of the composite bears a proportional relationship with the sliding velocity,sliding distance and normal load.%通过往铝熔体中添加K2ZrF6和KBF4制备AA6061/ZrB2原位复合材料,并对该复合材料的干滑动磨损形为进行研究.构建了一数学模型来预测该复合材料的磨损速率.采用4因素5水平的中心复合旋转设计方法来减少实验工作量.考察滑动速度、滑动距离、载荷和ZrB2质量分数这4个因素对制备的复合材料的磨损速率的影响,通过观察磨损表面形貌分析这些因素的影响.结果表明,原位生成的ZrB2颗粒改善了复合材料的磨损性能.该复合材料的磨损速率随着滑动速度、滑动距离和载荷的增加而增加.