氧化铝/石墨-硫酸钡层状复合材料的摩擦学性能及润滑机理  

Tribological Properties and Lubrication Mechanism of Al2O3/Graphite–BaSO4 Laminated Composites

作　　者：宋俊杰[1] 樊恒中 苏云峰[1] 张永胜[1] 胡丽天[1] SONG Junjie;FAN Hengzhong;SU Yunfeng;ZHANG Yongsheng;HU Litian(State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China)

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室

出　　处：《摩擦学学报》2019年第6期723-729,共7页Tribology

基　　金：国家自然科学基金项目(51775534);中国科学院青年创新促进会人才专项(2013272)和中国科学院“西部之光”人才培养计划(2018)资助~~

摘　　要：将石墨和硫酸钡按一定比例复合作为弱界面层,通过铺层-冷压-放电等离子烧结工艺制备了Al2O3/Graphite-BaSO4层状复合材料.考察了复配润滑剂的组分对层状复合陶瓷在室温至800℃连续加热过程中自润滑性能的影响规律,并通过磨损表面分析探讨了其在宽温域下的协同润滑机制.结果表明:通过复配在室温和中高温度段具有优异自润滑性能的固体润滑剂,并借助仿贝壳材料独特的层状结构特征,可有效改善氧化铝陶瓷在不同温度段的摩擦学性能,进而实现材料在较宽温度范围内的连续润滑.基于润滑相组分优化的复合材料在室温至800℃温度范围内与Al2O3栓对摩时的摩擦系数可保持在0.28~0.48之间,比块体Al2O3陶瓷/Al2O3栓摩擦副的摩擦系数降低了近60%.Al2O3/Graphite-BaSO4 laminated composites,combining graphite and BaSO4 in a certain proportion as weak interfacial layer,were prepared by a layer-by-layer method,dry-pressing and spark-plasma-sintering.The influence of the composition of the multi-lubricant on the self-lubrication performance of laminated ceramics during continuous heating from room temperature to 800℃was investigated,and the synergistic lubrication mechanism in a wide temperature range was discussed by analyzing the worn surfaces.Results show that combined strategies,i.e.incorporating different lubricants adapted for room temperature and medium high temperature,and unique layered structure of bionic laminated composites,effectively improved the tribological properties of materials at elevated temperatures,and hence the lubrication over a wide temperature range was realized.The friction coefficients of the optimal laminated materials coupled with Al2O3 pin were in a range of 0.20~0.48 from room temperature to 800℃,which was 60%lower than that of monolithic alumina ceramics.

关 键 词：氧化铝 层状复合陶瓷 宽温域 自润滑 耐磨损 

分 类 号：TQ174.75[化学工程—陶瓷工业] TH117[化学工程—硅酸盐工业]