碳黑对MoS_(2)纳米润滑油的摩擦磨损性能影响

Effect of Carbon Black on Friction and Wear Performances of MoS_(2) Nano-Lubricating Oil

以PAO6润滑油为基础油,MoS_(2)为纳米添加剂,制备质量分数为0.02%的纳米润滑油。通过自主研制的缸套-活塞环摩擦实验台,对添加不同浓度碳黑颗粒的MoS_(2)纳米添纳米润滑油的摩擦学性能进行研究;通过电子扫描显微镜(SEM)对缸套表面磨痕进行观察。结果表明,低浓度的碳黑(0.01wt%和0.1wt%)可以进一步改善纳米润滑油的摩擦系数(降低7.7%和1.5%);任何浓度的碳黑都会导致纳米润滑油的抗磨性能恶化,甚至比未添加任何纳米颗粒的基础油的磨损量高约5~7倍;缸套的磨痕分析表明,碳黑通过破坏MoS_(2)纳米润滑油在摩擦副表面形成抗磨损膜的稳定性,加剧零件磨损。

Taking PAO6 lubricating oil as the base oil and MoS_(2) as the nano additive,nano lubricating oil with a mass fraction of 0.02%was prepared.Through the independently developed test bench for friction between cylinder liner and piston ring,the tribological performance of the MoS_(2) nano-lubricating oil was studied by adding different concentrations of carbon black particles to it.The wear marks on the cylinder liner surface were observed through the scanning electron microscope(SEM).The results show that low concentrations of carbon black(0.01wt%and 0.1wt%)can further improve the friction coefficient of nano-lubricating oil(decreased by 7.7%and 1.5%).Any concentration of carbon black will cause the deterioration of the anti-wear performance of nano-lubricating oil,and the wear amount is even about five to seven times higher than that of the base oil without adding any nano particles.The analysis of the wear scar of the cylinder liner shows that the carbon black can aggravate the wear of the parts by destroying the stability of the MoS_(2) nano-lubricant forming an anti-wear film on the surface of the friction pair.