【摘要】 目的以缸套/活塞环为试验对象,研究激光织构化与固体润滑镀层的协同减摩作用。方法采用脉冲激光在活塞环表面进行微孔化处理,利用电脉冲沉积法在微孔内制备具有不同MoS₂微粒浓度的Ni-MoS₂复合镀层,通过往复式摩擦试验研究织构化表面沉积固体润滑剂对活塞环-缸套的影响机制。结果镀液中MoS₂微粒浓度对镀层的硬度和摩擦学性能影响较大,相同电流密度下,电镀液中MoS₂微粒的质量浓度为5g/L时的镀层硬度最高,该浓度下Ni-MoS₂复合镀层在干摩擦下具有最佳的摩擦系数和最低的磨损率。织构化复合镀层可以显著改善接触面间的摩擦性能,相比未织构化摩擦配副,摩擦系数降低约0.2,磨损率下降50%。结论干摩擦条件下,表面织构可以有效地储存摩擦副之间的固体润滑剂和磨粒,在接触表面形成连续润滑膜,减少磨粒磨损。更多还原

【Abstract】 The work aims to study synergistic antifriction effects of laser-texturing and solid lubrication coating with cylinder/piston ring as test object. Microporous treatment was performed on piston ring surface with pulse laser. MoS₂ composite coatings with different concentration of Mo S2 particle were deposited in the micropores in the method of electric pulse deposition. Reciprocating friction test was performed to study how textured surface deposition of solid lubricant affected piston ring-cylinder liner. Concentration of MoS₂ particles in the plating solution had a great influence on hardness and tribological property of the coatings. Provided that current density was the same, hardness of the coatings was the maximum, and the composite coatings had the optimum friction coefficient and the lowest wear rate under dry friction when mass concentration of MoS₂ particles was 5 g/L in the plating solution. Textured composite coatings could significantly improve tribological property between contact surfaces. Compared with the non-textured friction pair, friction coefficient of the textured composite coatings decreased by nearly 0.2, and wear rate decreased by 50%. Surface texturing can effectively store solid lubricant and abrasive grains between friction pair, generate continuous lubricating film on the contact surface and reduce abrasive wear.更多还原