粉末冶金复合材料水润滑条件下的摩擦学性能

Research on tribological properties of powder metallurgy composites under water lubrication

针对水液压元件摩擦副润滑困难、使用寿命短等方面的不足,制备了一种以316L不锈钢粉末冶金材料为基体、含有纳米金刚石颗粒悬浮液填充孔隙的复合材料,在水润滑条件下对复合材料和碳纤维增强聚醚醚酮(CFRPEEK)进行了端面摩擦磨损试验,并将其与316L不锈钢材料、316L粉末冶金材料、316L粉末冶金材料+润滑油进行了对比,研究了复合材料的摩擦学性能.结果发现:在500 r/min转速、400 N外载荷下,复合材料和CFRPEEK配对的平均摩擦因数为0.027,CFRPEEK的磨损率为0.128×10-16m3/(N·m),均小于其余三种配对方式,表明复合材料具有较好的摩擦学性能.复合材料表面产生了抛光效应,主要磨损机理为犁削效应;配对的CFRPEEK磨损机理为犁削机理,纳米金刚石颗粒的加入有效抑制了塑性变形的发生.

To solve the poor lubrication and short life of friction pairs in water hydraulics components, a powder metallurgy composite was prepared in this paper.The composite contained 316L stainless steel powder metallurgy and suspension containing diamond nanoparticles.The friction and wear characteristics of carbon fiber reinforced polyetheretherketone(CFRPEEK) sliding on the composite,pure 316L stainless,316L powder metallurgy and 316L powder metallurgy filled oil were investigated under water lubrication.It is discovered that the average friction coefficient of composite matched with CFRPEK is 0.027 and the wear rate of CFRPEEK is 0.128×10-16 m3/(N·m) at 500 r/min and 400N,which are lower than those of other friction pairs.It indicates that the composite has excellent friction properties.Additionally,the polishing effect is produced on composite surface and the main wear mechanism is plough. The wear mechanism of the CFRPEEK is plough and the plastic deformation is effectively restrained with adding the diamond nanoparticles.