耐高温自润滑材料PM304的磨损性能  

Tribological Property of High Temperature-Resistant Self Lubricating PM304 Composite

作　　者：丁春华[1] 李鹏亮[1] 周敬恩[1] 丁秉钧[1] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室,陕西西安710049

出　　处：《稀有金属材料与工程》2007年第7期1200-1204,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助(50601019);陕西省自然科学基金资助(2005E114)

摘　　要：通过高能球磨与粉末冶金制备出耐高温自润滑材料PM304。PM304的组成成分与PS304相同,但PM304组织致密,3种自润滑成分尺寸细小。研究发现,环境温度与组织结构对PM304的摩擦磨损性能有较大影响。室温时,PM304的磨损率很大,摩擦表面显示严重的微观脆性断裂;随着温度升高至200～600℃,由于BaF2/CaF2与Ag具有较高的热膨胀系数,在压力与摩擦力的作用下,溢出的BaF2/CaF2与Ag发生塑性变形并在摩擦表面形成光亮层,导致PM304的磨损率减小。PM304 composite has been prepared by high energy ball milling and powder metallurgy. The microstructure is dense and fine. The tribological behavior of PM304 was investigated by using a round plate made of Inconel X-750 at temperature range from 20 ℃ to 600 ℃. It is showed that the temperature and microstructure had great effects on the wear rates with a great value at 20 ℃ for the PM304. The worn surface showed that the brittle fracture is the dominant wear mechanism. With the increase of temperature, the overflowed BaF2/CaF2 and Ag formed a lucency layer by plastic deformation under the actions of pressure and friction force due to their high thermal expansion coefficients. As a result, the wear rate of PM304 was decreased.

关 键 词：PM304 自润滑 摩擦磨损 

分 类 号：TH117.22[机械工程—机械设计及理论]