(中南大学 粉末冶金国家重点实验室, 长沙 410083)
摘 要: 研究了Ni-Cr-Mo-S合金的自润滑机理。 结果表明： 合金的显微组织主要是由金属基体和硫化物相与 Ni(Cr)合金形成的共晶体两部分构成。 随着温度的升高, Ni-Cr-Mo-S合金的摩擦因数逐渐降低；合金材料中生成的共晶体在摩擦面的温度作用下可以变软或熔化形成具有转移性的自润滑膜。在实验的高温下, MoO3和NiO也参与了润滑作用： 随着温度的上升, MoO3所起的固体润滑作用逐渐减小, NiO所起的固体润滑作用逐渐增大。在室温摩擦时, 轻微粘着磨损为主要磨损形式；在高温摩擦时, 磨粒磨损为主要磨损形式, 同时也会出现氧化磨损。
关键字: 镍基合金； 高温自润滑； 固体润滑
（State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China）
Abstract:The self-lubricating mechanism of a Ni-Cr-Mo-S alloy was studied. The results show that the microstructure of materials is made up of metallic matrix and sulfide eutectics or their combinations. The eutectics can be softened or melted to form self-lubrication transferring film under the effects of temperature on the wear surfaces. MoO3 and NiO will join in the lubrication process at experimental high- temperature.With increasing temperature, the lubrication effect of MoO3 decreases while that of NiO increases. The dominant wear type is slight slip-sticking abrasivion at room temperature and particle abrasivion mixed with oxidation wear during high-temperature friction process.
Key words: nickel base alloy, high-temperature self-lubrication, solid lubrication
