采用液相化学还原法结合界面生长法,以醋酸铜为母体,维生素C(Vc)为还原剂,聚乙二醇2000为修饰剂,正丁醇为生长剂,制得粒度分布为18.2～80.2 nm、平均粒度为44.7 nm的油溶性球形纳米Cu样品.XRD分析表明样品的晶格常数膨胀率为1.478%.将样品添加到SF15W/40汽油机油中制得金属纳米润滑油.高浓度激光粒度仪检测表明,该金属纳米润滑油具有优异的分散稳定性.在UMT-II摩擦磨损试验机上考察SF15W/40汽油机油、金属纳米润滑油的摩擦磨损性能.结果表明:与SF15W/40汽油机油相比,金属纳米润滑油较大程度降低了摩擦系数,减小了磨损量,显著改善了SF15W/40汽油机油的摩擦性能;纳米Cu的最佳添加量为0.8%.
Oil-soluble Cu nanoparticles were prepared by an oil-water interface growth method, using ascorbic acid as a reductant, polyethylene glycol (PEG-2000) as a modifier, and 1-butanol as growth agent. The particle size distribution of the obtained nanoparticles was between 18.2-80.2 nm, and the average size was 44.7 nm. The microstructures of these nanoparticles were characterized by XRD, TEM and high-concentration laser granularity scatter analyzer. The XRD patterns indicate that the lattice parameters of these Cu nanoparticles are enlarged by about 1.478%. The anti-wear and friction performance of SF15W/40 lubricating oil with these Cu nanoparticles were measured by ball-on-disk UMT-II tribometer. It is found that the oil-soluble Cu nanoparticles have wetting effect and can be kept in dispersing form for long-term in SF15W/40 lubricating oil; the tribological performance of SF15W/40 lubricating oil with nano-Cu is improved. The best additive content of oil-soluble nano-Cu in SF15W/40is 0.8% (mass fraction), and in such case the friction coefficient and wear loss are the lowest.
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