互穿网络式高温自润滑材料摩擦磨损性能研究  

Study of Tribological Properties of High Temperature Self-lubrication Composites with an Interpenetrating Network

作　　者：王砚军[1,2] 刘佐民[2] 赵方[1] 

机构地区：[1]济南大学机械工程学院,山东济南250022 [2]武汉理工大学摩擦学研究所,湖北武汉430070

出　　处：《润滑与密封》2009年第5期17-21,共5页Lubrication Engineering

基　　金：国家自然科学基金资助项目(50775168);山东省自然科学基金资助项目(Y2008F33)

摘　　要：模拟生物体汗腺结构特征,以硬脂酸、TiH2和CaCO3的复合体为造孔剂,采用真空烧结法制备出互穿网络式微孔结构的TiC/FeCrWMoV金属陶瓷烧结基体,并在高温真空压力下浸渗Pb-Sn-RE系高温固体润滑剂得到高温发汗自润滑金属陶瓷。采用高温摩擦磨损试验机考察了其摩擦磨损性能,运用扫描电子显微镜(SEM)、光电子能谱(EDS)和X射线衍射(XRD)分析磨损表面成分、形貌和结构,探讨高温摩擦磨损机制。结果表明:该自润滑复合材料硬质相与润滑相互相贯穿成网络状,在较宽的温度范围内具有良好的自润滑性能,特别是在400～700℃试验温度范围内,具有较低的摩擦因数(平均摩擦因数为0.26～0.29)和较低的磨损率(6.3×10-6～9.6×10-6mm3/(N.m))。由于摩擦应力及摩擦热的作用,该类材料在高温下在磨损表面形成复合润滑膜(由PbMoO4、PbO、Ag2WO4和Ag3Sn等组成)是其具有良好自润滑性能的主要原因。Based on the sweat-gland characteristics of organism,TiC/FeCrWMoV metal ceramic preforms with three di- mensionally interpenetrated micropores were fabricated by vacuum liquid phase sintering method using the mixture of stear- ic acid, Till2 and CaCO3 as pore forming agent. A self-made vacuum high pressure infiltration furnace was used to infiltrate the preforms with Pb-Sn-RE based solid lubricants to create almost fully dense self-lubrication composites. The friction and wear behaviors of the composites were investigated using a pin-on-disk wear tester. The compositions,images and structure of worn surfaces were analyzed using SEM, EDS and XRD. The friction and wear mechanism was discussed. The experimen- tal results indicate that solid lubricants are well dispersed and embedded in the metal ceramic matrix. The composites ex- hibit good self-lubricating properties over a wide range of temperature, especially under 400- 700℃, the friction coeffi- cient of the composites infiltrated with Pb-Sn-10Ag-0. 5RE is ranging from 0. 26 to 0. 29 and the wear rate is ranging from 6. 3 ×10^-6 -9.6 ×10^-6 mm^3/（ N .m）. During elevated temperature sliding,the solid lubricants are squeezed out of the micropores to the frictional surfaces to form PbMoO4, PbO, Ag2WO4 and Ag3Sn. The formation of PbMoO4, PbO, Ag2WO4 and Ag3 Sn complex film is the main reason that the composites have good self-lubrication properties at high temperature.

关 键 词：金属陶瓷 复合材料 自润滑 摩擦磨损性能 复合润滑膜 

分 类 号：TH117.1[机械工程—机械设计及理论]