含污染物油润滑条件下n-Al2O3/Ni复合电刷镀层的摩擦学性能研究

采用电刷镀技术制备了n-Al2O3／Ni复合镀层，在T-11型球一盘式摩擦磨损试验机上对比考察了快速镍镀层及纳米复合刷镀层在含污染物油润滑条件下的摩擦学性能．结果表明，由于纳米颗粒的强化作用，n-Al2O3/Ni复合镀层的硬度及含污染物油润滑条件下的耐磨性比快速镍镀层分别提高了60％和30％，其磨损机理在低载下以磨粒磨损为主，在高载下以粘着磨损为主。

Study on the Tribological Properties of Electro-Brush Plated Nano-Al2O3/Ni Composite Coating under the Lubrication of Oil Containing Abrasive Contaminant

Ni-based composite coating doped with nano-Al_2O_3 particulates was prepared making use of electro-brush plating. The tribological properties of the resulting composite coating sliding against Si_3N_4 under the lubrication of 50 cc oil for diesel engine containing SiO_2 and Al_2O_3 contaminant were comparatively investigated on a T-11 ball-on-disk friction and wear tester, using quick speed nickel coating as the reference. The worn surface morphologies of the quick speed nickel coating and composite coating were observed on a scanning electron microscope, while the morphological features of the wear debris in the residue lubricating oil were analyzed by means of ferrograph. It was found that the composite coating doped with Al_2O_3 particulates had much higher hardness and better wear resistance than the quick speed nickel coating, which was attributed to the fine-particle strengthening and dispersive strengthening functions of the nano particulates. The composite coating was dominated by abrasive wear as it slid against the ceramic counterpart at a relatively smaller load, while it was mainly characterized by adhesion wear at a relatively higher load.