摘要
用粉末冶金方法制备了含钨—石墨以及其他增强相的镍基合金材料,评价了材料在室温至700℃条件下的摩擦磨损性能。结果表明,室温条件下,热压过程中生成的硬质碳化物、石墨的润滑作用,以及合金表面的摩擦细化作用,使材料表现出良好的摩擦磨损性能; 200℃和400℃条件下,合金表面石墨的氧化分解及成膜能力不足．导致摩擦学性能下降; 600℃和700℃时,高温氧化生成的氧化物及钨酸盐在摩擦面形成的固体润滑膜改善了润滑条件,摩擦因数降低,且较为稳定,磨损体积由于氧化而增大。
The nickel-based composites filled with tungsten,carbide and other reinforce phases were prepared by powder metallurgical hot pressing.The friction and wear behaviors of the nickel based composites sliding against Al_2O_3 ceramic in a pin-on-disk configuration were evaluated on a high-temperature friction and wear tester.The worn surfaces of the Ni-based composites and the counterpart Al_2O_3 disks were analyzed by means of optical microscopy and XRD.It is found that the horniness carbide which is created during hot pressing process,the lubrication effect of graphite,and grain refinement on the surface contribute to excellent tribological properties of composites at room temperature.The friction coefficient and wear volume of the composites are increased at temperature 200℃and 400℃,which attribute to the decomposition of the graphite on the surface and absence abil- ities of form films.When temperature elevated to 600℃and 700℃,the oxide and tungstate created at elevated temperature,and formed solid lubricating films on the surface,which largely account for the decrease and stabilization of friction coefficient,and wear volume increased attribute to oxidation.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2006年第S2期388-391,共4页
China Mechanical Engineering
关键词
镍合金
石墨
碳化物
高温摩擦学
钨酸盐
Ni alloy
graphite
carbide
high temperature tribology
tungstate
