摘要
用粉末冶金的方法热压制备了含不同合金相及MoS2或石墨的两种镍基复合材料,测试了合金机械性能及其在室温至600℃范围内的摩擦磨损性能,同时还探讨了其耐磨机理。研究结果表明,由于增强合金相的加入,复合材料的硬度明显增加,抗弯强度却降低了。该合金主要由N i基固溶体、不定比化合物CrxSy等相组成,在室温下由于摩擦过程中生成的纳米晶结构的磨屑,材料具有一定的抗磨减摩性能,主要为磨粒磨损;至200℃时摩擦表面氧化变软,没有成膜润滑能力,摩擦学性能下降;600℃高温摩擦时,承载表面及磨屑中的氧化物、钨酸盐及残余硫化物的协同作用使摩擦因数进一步降低。
Two nickel based alloys were prepared by powder metallurgy with different alloy phase and MoS2 or graphite. The mechanical and tribological behavior of the composite sliding against A1203 ceramics at temperatures from 20 to 600℃ were studied using pin-on-disk apparatus, and the mechanisms of self-lubrication and wear resistance were studied. The resuits show that at 20 ℃ the worn surface of the composite is characterized by mild scuffing and micro cracks as well as fine wear debris, the debris has the nano-crystal structure. When the temperature was elevated to 200 ℃, the friction coefficient is the highest, the worn surface of the composite is characterized by severe adhesion and oxidation. However at 600℃, the friction coefficient is reduced because of the oxides, tungstates and sulfides on the wear surface, the worn surface of the composite is characterized by abrasive and oxidation.
出处
《润滑与密封》
EI
CAS
CSCD
北大核心
2005年第6期129-132,共4页
Lubrication Engineering
关键词
粉末冶金
镍合金
高温自润滑
钨酸盐
powder metallurgy
nickel alloy
high temperature self-lubrication
tungstate