分散介质对铜纳米粒子润滑油添加剂摩擦学性能的影响

Effect of Dispersiton Media on Tribological Performance of Cu Nanoparticles in Lubricating Oils

本文利用十二烷基硫酸钠/异戊醇/环已烷/水微乳液体系制备了铜纳米粒子,并将其作为添加剂分散在含有聚丁二酰亚胺(T154)、石油磺酸钙(T101)或三烷基氯化铵(Aliquat336)的500SN基础油中,用四球实验机考察了不同分散介质对铜纳米粒子添加剂摩擦学性能的影响,并用X-射线光电子能谱(XPS)分析磨斑表面的组成和价态.实验结果表明:分散介质对铜纳米粒子添加剂的摩擦学性能的影响较大.分散介质对铜纳米粒子添加剂润滑性能影响的优劣顺序为5000SN+T101+Alquat336>500SN+T101+Alquat336≈5000SN+T154+T101>500SN+T154>500SN;在磨斑表面能形成含有铜、氧化亚铜和氧化铜粒子的保护膜,且这些粒子在磨斑表面上可能起到类似“轴承”的作用,从而使铜纳米粒子添加剂表现出较好的摩擦学性能.

In this paper, we described the synthesis of Cu nanoparticles in microemulsions of sodium dodecyl-sulphate (SDS) / isopentanol/cyclohexanene/water and the effect of dispersion media on tribological performance of Cu nanoparticles in 500SN base oil. The results indicated that the tribological behaviors of Cu nanoparticles were significantly affected by the dispersion media composed of desper-sants such as polybutanediimide (T154), calcium alkide-phenylsulfonate (T101) or methyl-trialkylaminechloridate (Aliquat336). The tribological performance of Cu nanoparticles decreased in the following dispersion midia order. 500SN + T154 + T101 + Aliquat336 > 500SN + T101 + Aliquat336≈500SN+T154 + T101>500SN + TI54>500SN. The rubbing surface was analyzed by X-ray photoelectron spectroscopy (XPS) and the result showed that a deposit film formed in the contacting surfaces and was composed of Cu, Cu2O and CuO. Some people believed that the improvements in friction and wear were due to the formation of deposit film and the presence of nanoparticles which may act as ball bearing in nibbing surfaces.