超细铜粉在合成润滑油PAO10中的摩擦学性能

Tribological Properties of Ultrafine Copper Particles in Synthetic Lubricant PAO10

采用高能球磨法和热还原法分别制备了长度为5μm的片状与粒径为150nm的球状铜粉。对比了两者在合成润滑油PAO10中的摩擦学性能,并对摩擦机理进行了讨论。结果表明,与不含铜粉的基础油相比,含超细铜粉油样的最大无卡咬负荷(PB)最高增大了27.5%,PB与铜粉粒度和形貌关系甚微;摩擦系数(μ)降低了43.6%,磨斑直径(WSD)减小了47.9%;热还原法制备的铜粉由于粒径小、呈球形,具有更优异的减摩抗磨性能。抛光机制、转移膜机制与反应膜机制三者的共同作用使含超细铜粉的润滑油具有良好的摩擦学性能。

Two kinds of Cu powder with different morphology were synthesized by high energy ball milling and thermal reduction methods, respectively, which were flake-like with 5μm long and spherical with 150 nm diameter. Meanwhile, their tribological properties and mechanism in PAO10 were investigated. The results showed that with the addition of ultrafine Cu powder in PAO10 the maximum non-seizure load （PB） was increased by 27.5%, and the friction coefficient （μ） and wear scar diameter （WSD） were decreased by 43.6% and 47.9% at most, respectively, as compared to the base oil without Cu powder. And the Pb had little to do with the size and morphology of the Cu particles, however, the Cu powder prepared by thermal reduction exhibited better anti-friction and anti-wear properties due to its small size and spherical morphology. Because of the synergy of polishing, transfer film and reaction film mechanism, the excellent tribological properties of lubricating oil containing ultrafine Cu powder were observed.