AlN_P/Al和TiB_(2P)/Al复合材料摩擦磨损性能研究

Friction and Wear Properties of AlN_P/Al and TiB_(2P)/Al Composites

研究了油润滑条件下两种不同铝基复合材料及其基体合金的摩擦磨损性能,分析了增强体对材料摩擦磨损性能的影响以及相应的磨损机理。结果表明:油润滑条件下,随着摩擦时间的延长,AlNP/Al复合材料的摩擦系数由小变大趋于稳定;而TiB2P/LY12复合材料的摩擦系数却是由大变小趋于稳定,这主要与其摩擦过程中形成凹坑产生润滑油膜有关。由于增强体强度的增加,50%(体积分数,下同)TiB2P/Al复合材料的摩擦系数低于50%AlNP/Al复合材料,且耐磨性优于50%AlNP/LY12复合材料。增强相的加入显著提高了材料的耐磨性,使得复合材料的抗粘着能力明显优于基体合金。

The friction and wear properties of two composites and matrix alloy under oil-lubricated conditions were investigated, and related wear mechanisms were analyzed. Results show that, under lubricated conditions, friction coefficient of AlN_P/Al composite changes from low to high and gradually becomes steady, but just the reverse is that of TiB_(2P)/Al composite due to the formation of lubricating oil film. As particles strength increases, 50% (volume fraction) TiB_(2P)/Al composite has lower friction coefficient and higher wear resistance than that of 50% AlN_P/Al composite. In addition, because of introduction of particle reinforcements, adhesion resistance of composites is obviously improved and better than that of matrix alloy.