二烷基二硫代磷酸锌添加剂对油润滑下填充聚四氟乙烯复合材料摩擦磨损性能的影响

利用MM-200型摩擦磨损试验机对比考察了聚四氟乙烯(PTFE)及其铜和镍填充复合材料在干摩擦以及液体石蜡和含商品添加剂二烷基二硫代磷酸锌(ZDDP)的液体石蜡-润滑下同GCr15轴承钢对摩时摩擦磨损性能,采用能量色散X射线显微分析(EDXA)测定了钢环磨损表面S和Zn元素的面分布,进而探讨了ZDDP对液体石蜡减摩抗磨作用的影响.研究表明:液体石蜡及含2%ZDDP的液体石蜡润滑均可大幅度降低摩擦副的摩擦系数,同时可显著降低PTFE-30%Ni复合材料的磨痕宽度,但对PTFE-30%Cu复合材料抗磨性能的影响不大.ZDDP作为添加剂可以有效地提高液体石蜡的抗磨作用,但对其减摩作用几乎无影响;ZDDP作为添加剂在摩擦过程中未发生摩擦化学反应,而是以物理吸附或化学吸附的方式在摩擦副接触表面成膜,从而起到抗磨作用.

Effect of Zinc Dialkyldithiophosphate as Additive in Liquid Paraffin on Friction and Wear Properties of Filled Polytetrafluoroethylene Composites

An MRH-3 friction and wear tester was performed to evaluate the friction and wear behavior of flame-sprayed nylon1010 coating sliding against SAE52100 steel in a block-on-ring configuration, making use of uniform design method. The friction and wear test results were regression analyzed making use of Windows SPSS 11.0 statistics software. Thus a mathematical model was established to correlate the friction coefficient and wear mass loss of the coating with the PV value, while the worn surface morphologies of the coatings under different test conditions were observed on a scanning electron microscope. It was found that the regression formulae had prominence and statistical validity. The friction and wear behavior of the flame-sprayed nylon-1010 coating under different test conditions was closely related to the PV value, which was because the visco-elasticity of the coating varied with the variation of the sliding surface temperature. The nylon-1010 coating was dominated by elastic deformation at a smaller PV value which corresponded to a lower sliding surface temperature, thus the friction coefficient and wear mass loss were smaller in this case. The sliding surface temperature and damage increased with increasing PV value, thus the friction coefficient and wear mass loss increased aw well. At a high enough PV value, the sliding surface of the coating would experience local melting and form some kind of lubricating film, hence the friction coefficient and wear mass loss increased. The nylon-1010 coating was dominated by plastic deformation, fatigue, and adhesive wear.