微米氧化铅及其晶型对润滑脂摩擦性能的影响研究

THE IMPACT OF MICRON LEAD MONOXIEDE AND ITS CRYSTAL STRUCTURE ON TRIBOLOGICAL PROPERTIES IN LUBRICATING GREASE

以直接沉淀法制备了片状微米α-PbO和β-PbO颗粒,并使用硬脂酸对其进行了表面改性,采用XRD、FT-IR等方法对产物进行了表征。考察对比了两种颗粒在7029脲基润滑脂中的摩擦性能,并对相应的摩擦学机理进行了探讨。结果表明:超细氧化铅最高能提高润滑脂的承载负荷107.7%,减小摩擦系数46.1%,β-PbO比α-PbO具有更好的摩擦学性能。超细氧化铅主要通过成膜等机制作用,削弱了摩擦过程中磨损、防止了铁基摩擦副的直接接触,达到减摩抗磨的效果。

Micron α-PbO and β-PbO flakes were synthesized by direct precipitation respectively, and then were modified by stearic acid. The structures were determined by means of XRD and FT-IR. Meanwhile, their tribological properties and wear mechanism in 7029 lubricating grease were investi- gated. The results showed that the addition of ultrafine lead monoxide particles in grease increased the carrying capacity by 107.7 % and decreased the friction coefficient by 46.1%, while β-PbO had better tribological properties than α-PbO. The anti-friction and anti-wear functions were achieved mainly by film-forming and other mechanisms to reduce the wear and prevent the direct contact between the Fe-based tribopairs during friction process.