纳米SiO_(2)颗粒对润滑油摩擦学性能的影响

Effect of SiO_(2)Nanoparticles on Tribological Properties of Lubricants

为降低摩擦磨损,提高润滑油的抗磨减磨性能,向润滑油中加入纳米二氧化硅颗粒作为添加剂,配制不同浓度的纳米润滑油,考察油酸作为分散剂时对油液中颗粒分散性能的影响,并采用Rtec多功能摩擦磨损实验机的往复模块研究了SiO_(2)颗粒对润滑油摩擦性能的影响,同时对磨损表面进行观测。结果表明,油酸与SiO_(2)颗粒质量比为3∶5时分散效果最佳,加入纳米SiO_(2)颗粒能提高润滑油的润滑性能,添加浓度为1.0wt.%润滑性能最佳,平均摩擦系数和磨痕宽度分别下降了27.78%,31.30%。在不同工况下,加入SiO_(2)润滑剂能显著提高润滑效果,高速轻载时摩擦因数和磨痕宽度分别下降了31.45%,11.86%;低速重载情况下,摩擦因数和磨痕宽度分别下降了31.38%,2.65%。在摩擦过程中,SiO_(2)颗粒沉积在摩擦表面,对表面进行填充,形成了一层保护膜,从而降低了摩擦磨损。

In order to reduce frictional wear and improve the anti-wear and anti-wear performance of lubricating oil,nano-SiO_(2)particles were added to the lubricating oil as additives to prepare nano-lubricating oil with different mass fractions,and the effect of oleic acid as dispersant on the particle dispersion performance in the oil was investigated,and the reciprocating module of Rtec multifunctional friction and wear experimental machine was used to study the effect of SiO_(2)particles on the friction performance of lubricating oil,and the wear surface was observed.The results showed that the best dispersion effect was achieved when the mass ratio of oleic acid to SiO_(2)particles was 3:5.The addition of nano-SiO_(2)particles to the lubricant significantly improved the lubricity performance of the lubricant,and the best lubricity performance was achieved with the addition concentration of 1.0 wt.%,and the friction factor and wear scar width decreased by 27.78%and 31.30%,respectively.Under different working conditions,the addition of SiO_(2)lubricant can significantly improve the lubrication effect,and the friction factor and wear scar width decreased by 31.45%and 11.86%respectively at high speed and light load,while the friction factor and wear scar width decreased by 31.38%and 2.65%respectively at low speed and heavy load.During the friction process,SiO_(2)particles were deposited on the friction surface,filling the surface and forming a protective film,thus reducing the frictional wear.