纳米铜在460号矿山润滑油中的悬浮稳定性与摩擦学性能

为了进一步提高460号润滑油的综合机械性能,将液相还原法制备的纳米铜悬浮液,经性质介于醇类和油类的缓冲液,以及非离子表面活性剂聚氧乙烯失水山梨醇单油酸酯(吐温80)与失水山梨醇单油酸酯(司盘80)复合包覆改性后,将其以不同的比例与460号润滑油进行调和,制备出纳米铜润滑油,对纳米铜在润滑油中的悬浮稳定性及摩擦学性能进行考察。结果表明:当改性纳米铜悬浮液中的缓冲液、吐温80以及司盘80的用量分别为纳米铜的233.0%、2.0%和2.0%时,其在460号润滑油中保持了极高的悬浮稳定性。含0.30%纳米铜的460号润滑油具有最佳的抗磨与减摩性能,其在20 N负荷下的摩擦系数与原460号润滑油相比降低了41%,极压抗磨性能提高了46.8%。第三方检测结果表明,460号纳米铜润滑油完全符合国家规定的相应润滑油指标,且四球机试验的综合磨损指数(ZMZ)上升34%,磨斑直径(WSD)下降了7%。

Suspension Stability and Tribological Performance of Nano-Copper in 460 Lubricating Oil

The nano-copper suspension prepared by the liquid phase reduction method was composite-surface modified by the buffer solution with properties between alcohols and oils,and nonionic surfactants( Tween 80 and Span 80),which were mixed with 460 lubricating oil in various ratios to prepare nano-copper lubrication oil. The suspension stability and the tribological properties of nano-copper in 460 lubricating oil were researched. Results showed that when the amounts of buffer,Tween 80 and Span 80 in modified nano-copper suspension were233.0%,2.0% and 2.0% of that of nano-copper,the obtained lubricating oil could maintain high suspension stability. The 460 lubricating oil with 0.30% nano-copper possessed the optimal anti-wear and friction reducing properties,and the friction coefficients were reduced by41% compared with original oil under 20 N load. Meanwhile,the extreme pressure performance was improved by 46.8%. Results of Third Party Testing showed that the 460 lubricating oil fully complied with the corresponding lubricant index specified by the state,and the four-ball machine experiment showed that the comprehensive wear index( ZMZ) was increased by 34%,and the wear spot diameter( WSD) was decreased by 7%.