纳米Al2O3／Ni复合电刷镀层的表征与微动磨损机理

通过在镍基电刷镀液中添加纳米Al2O3颗粒,制备出了分散均匀、与基质金属Ni结合良好的Al2O3／Ni复合电刷镀层。复合镀层的组织致密,显微硬度高。微动磨损试验表明,复合镀层在常温及高温下抵抗微动磨损的能力均强于普通快镍镀层。这是因为,随着纳米颗粒的加入,Al2O3／Ni复合电刷镀层受到细晶强化、位错强化和弥散强化,抵抗塑性变形和粘着破坏的能力增强,从而具有良好的耐微动磨损性能。

Characterization and Strengthening Mechanisms of Nano-Al2O3/Ni Composite Layer

The Al2O3/Ni composite brush plating coating with homogeneous distribution and good bonding with matrix metal Ni was prepared through adding nano-Al2O3 grains into the Ni-base electro-brush plating bath. The microstructures of the composite brush plating coating are superior to the common rapid Ni-base brush plating coating. The tribological results show that the abrasion-proof of the composite plating coating is better than that of the common plating coating not only at room temperature but also at high temperature. It is found that the plastic deformation-resistance and adhesion reduction performances of the composite plating coating were improved under strengthening effect of nano-Al2O3 grains.