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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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)
