载荷对PTFE/AlSi10Mg复合材料摩擦磨损行为的影响  

Effects of Loading on Friction and Wear Behavior of Self-lubricating PTFE/AlSi10Mg Composites

作　　者：曾进 黎晓华[1] Zeng Jin;Li Xiaohua(Key Laboratory of Special Functional Materials,College of Materials Science and Engineering,Shenzhen University)

机构地区：[1]深圳大学材料科学与工程学院,深圳市特种功能材料重点实验室

出　　处：《特种铸造及有色合金》2020年第3期307-312,共6页Special Casting & Nonferrous Alloys

摘　　要：采用选区激光熔化(SLM)、浸渗和真空烧结工艺制备了以AlSi10Mg为基体的多孔骨架填充聚四氟乙烯(PTFE)的自润滑复合材料。采用往复式Bruker UMT-3摩擦试验机研究了速度为5mm/s、不同载荷下复合材料的摩擦磨损性能,并采用SEM、EDS等对其成分、结构以及摩擦学行为进行了研究。结果表明,复合材料的平均摩擦因数和磨损率随着载荷的增加呈现先增大后减小的趋势;复合材料的摩擦稳定性主要由存储在骨架中的PTFE决定。其摩擦机制主要是在载荷的作用下,当磨擦表面发生磨损时,骨架中的PTFE将磨屑捕获,形成完整的PTFE润滑层,并且发生膜的转移,从而增加了复合材料的摩擦学稳定性。A self-lubricating composites filled with polytetrafluoroethylene with AlSi10 Mg as the matrix was prepared by selective laser melting(SLM),impregnation and vacuum sintering.The friction and wear behavior were investigated by reciprocating Bruker UMT-3 friction tester under different loads(10,30,50,70 N)at a given speed(5 mm/s).The composition and structure of the composites prepared were characterized by SEM and EDS.The tribological behavior test was carried out on a ball-on-disc mode.The results reveal that the average friction coefficient and wear rate of the composites are increased firstly and then decreased with the increase of the load.The friction stability of the composite is mainly determined by the PTFE stored in the skeleton.The friction mechanism is mainly that when the friction surface is worn under the action of load,the PTFE stored in the skeleton will capture the abrasive debris to form a complete PTFE lubrication film,and to transfer the film,thus increasing the tribological stability of the composites.

关 键 词：AlSi10Mg 选区激光熔化(SLM) 聚四氟乙烯(PTFE) 自润滑摩擦材料 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TB331[金属学及工艺—金属材料]