摘要
为改善矿用内燃机零部件在宽温域范围内的摩擦学性能,采用热压烧结技术制备了不同比例固体润滑剂(7%MoS_(2)+7%ZnO, 9%MoS_(2)+5%ZnO, 11%MoS_(2)+3%ZnO)的钴基复合材料,通过高温摩擦磨损试验机测试了材料在室温、200℃、400℃、600℃和800℃的摩擦学性能,研究了材料的微观结构、物相组成和磨损机理。结果表明:三种材料的摩擦因数和磨损率表现出相似的变化趋势,MoS_(2)有效的改善了宽温域内复合材料的摩擦学性能,ZnO的减摩抗磨作用主要在800℃时发挥作用。宽温域内摩擦学性能的提高归因于中低温下的硫化物薄膜和高温下由ZnO、Co_(2)O_(3)和铬酸盐组成的氧化膜。材料在中低温下的磨损机理为磨粒磨损,高温下为氧化磨损。综合考虑,含9%MoS_(2)+5%ZnO的复合材料在宽温域内表现出最佳的摩擦学性能。
In order to improve the tribological performance of the parts of mine internal combustion engine in wide temperature domain, cobalt matrix composites with different proportions of solid lubricants(7%MoS_(2)+7%ZnO, 9%MoS_(2)+ 5%ZnO, 11%MoS_(2)+ 3%ZnO) were prepared by hot pressing sintering technology. The tribological properties of the composites at room temperature, 200℃, 400℃, 600℃ and 800℃ were tested by high temperature friction and wear testing machine. The microstructure, phase composition and wear mechanism of the materials were studied. The results show that the three materials show similar trends of friction coefficient and wear rate. MoS_(2)effectively improves the tribological properties of composites in a wide temperature range. The frictional and anti-wear effect of ZnO mainly plays a role at 800℃. The tribological properties over a wide temperature range are attributed to the sulfide films at moderate and low temperatures and the oxide films composed of ZnO, Co_(2)O_(3)and chromate at high temperatures. The wear mechanism is abrasive wear at low temperature and oxidation wear at high temperature. The results show that the materials containing 9%MoS_(2)+ 5%ZnO exhibit the best tribological properties over a wide temperature range.
作者
郭晓娥
赵金录
GUO XiaoE;ZHAO JinLu(Techanical and Electrical Engineering Department,Shanxi Institute of Energy,Taiyuan 030600,China;Department of Mechanical and Electronic Engineering,Shanxi Institute of Technology,Yangquan 045000,China)
出处
《机械强度》
CAS
CSCD
北大核心
2022年第2期335-340,共6页
Journal of Mechanical Strength
基金
山西省教育厅教研课题项目(J2018214,J2019223)
山西能源学院院级科研基金项目(ZY-2018015)资助。
关键词
热压烧结
固体润滑
摩擦
磨损
Hot pressing sintering
Solid lubricant
Friction
Wear
