深过冷Ni-Pb-Cu固体自润滑材料摩擦行为研究

Research on the Tribological Property of Undercooled Ni-Pb-Cu Solid Self-lubricating Alloy

采用深过冷快速凝固方法制备了均质N i-Pb-Cu偏晶合金,用扫描电镜对其组织进行了观察,在摩擦试验机上对其试样进行了摩擦性能测试,并分析了其摩擦磨损机制。结果表明:制备的N i-Pb-Cu偏晶合金其凝固组织为硬基体上均匀地分布着软质点;N i-Pb-Cu合金的摩擦学特性随过冷度的提高而呈上升趋势,从而在理论上证实采用深过冷技术制备难混熔偏晶合金固体自润滑材料是可行的;N i-Pb-Cu偏晶合金与45#钢的磨损为磨屑磨损、粘着磨损。

Ni-Pb-Cu solid self-lubricating materials were prepared by means of combination of molten-glass denucleation and cyclic superheating and cooling. Solidification microstructures were observed by SEM, tribological properties were tested on wearing and friction test machine, friction and wear mechanism was analysed. The results show that soft phase is dispersed in the hard basic of the prepared Ni-Pb-Cu monotectic alloys＇ solidiction microstructure;the tribological properties are better with the increase of undercooling, it＇ s proved that it＇ s possible to produce monoteetie alloy solid self-lubricating materials through undecooling techniqce. Ni-Pb-Cu monotactic alloy abraded with 45 steeel is debris and adhension wear tvpes.