含纳米镍粉锂基润滑脂的制备工艺

为提高传统锂基润滑脂的摩擦学性能,通过四球试验机研究镍粉的加入方式、粒径、添加量对锂基润滑脂摩擦学性能的影响,采用SEM和EDS等对磨斑形貌和成分进行分析表征,对其抗磨减摩机理进行初步探索。结果表明,在润滑脂中直接加入镍粉的摩擦学性能更好,粒径为20 nm的镍粉对润滑脂摩擦学性能改善最为明显,随着镍粉添加量的增加,润滑脂的摩擦因数和磨斑直径均先减小后增加,且添加量为2.5%时润滑脂的摩擦学性能最好,摩擦因数和磨斑直径分别较基础锂基润滑脂减小了38.03%和41.77%。镍粉加入到锂基润滑脂中能起到填平犁沟,修复磨痕表面的作用。

Preparation technology of the lithium base grease with Ni nanoparticle

In order to improve the tribological properties of traditional lithium base grease, Ni nanoparticles were added as grease additives in this paper. The influence of addition methods, particle size and addtion amount on tribological properties of lithium base grease were investigated. The morphology and element content of the worn surface were characterized by Scanning Electron Microscope (SEM) and Energy Disperse Spectroscopy (EDS), and the tribological mechanism were discussed . The results show that the tribological performance of grease added with Ni powder directly was better. The Ni nanoparticle with 20 nm diameter achieve the best anti-wear performance. The friction coefficient and wear scar diameter all first decreased and then increased with the increase of Ni nanoparticles, and the best addition was 2.5% which the friction coefficient and wear scar diameter decreased 38.03% and 41.77% respectively. The addition of Ni nanoparticles could fill furrows and repair the wear scar.