高温自润滑材料孔隙结构及其润滑剂驱动研究  

The Study of High-temperature Self-lubricating Materials Pore Structure and Lubricants Driven

作　　者：张一兵[1] 邢东征[1] 刘佐民[1] 

机构地区：[1]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5-8,共4页Lubrication Engineering

基　　金：国家自然科学基金项目(50775168)

摘　　要：采用有限元分析中的单元"生死"技术,对高温自润滑材料孔隙中润滑剂的动态析出过程进行了有限元分析,研究了摩擦热-热应力耦合作用对自润滑材料孔隙中润滑剂的驱动作用。研究表明:随着孔隙中润滑剂的减少,孔隙壁的变形逐渐增大;当孔隙中润滑剂高度小于孔隙高度的1/2时,孔隙壁变形对润滑剂的挤压驱动作用逐渐减小。当孔隙高度与孔隙直径之比大于4时,因摩擦作用而析出至摩擦表面的润滑剂体积量较稳定;当孔隙高度与孔隙直径之比小于4时,所析出润滑剂体积量变化较大,并且有明显减小的趋势。By using of Element Birth and Death method in finite element analysis, the dynamic output process of the sol- id lubricant stored in the pores of high-temperature self-lubricating materials was studied, and the coupling effect of friction heat and thermal stress in driving out the lubricant was researched. The results show,with the decrease of the height of lu- bricant in a pore, the deformation of the pore wall increases gradually. When the lubricant height is less than a half of the pore height, extruding and driving role on the lubricant reduces gradually due to the deformation. When the pore height is more than four times of its diameter, the lubricant volume emanated from a pore is showed in a stable state, otherwise, the lubricant volume is in an unstable state, and shows a clear trend of decreasing.

关 键 词：摩擦热 自润滑 耦合 热应力 

分 类 号：TH117[机械工程—机械设计及理论]