铝合金表面MoS_(2)/Al_(2)O_(3)复合涂层制备及减摩性能

Preparation and Antifriction Performance of MoS_(2)/Al_(2)O_(3) Composite Coating on Aluminum Alloy

铝合金表面减摩涂层设计和制备是改善铝合金构件摩擦性能的关键技术之一。对于目前铝合金结构件易磨损的问题,本研究采用微弧氧化一步法在6063铝合金表面原位合成纳米MoS_(2),制备具有减摩作用的MoS_(2)/Al_(2)O_(3)复合陶瓷涂层;讨论了硫盐浓度对涂层成分、形貌及减摩性能的影响,分析了涂层减摩机理。结果表明:通过微弧氧化在6063铝合金表面成功制备出了含有MoS_(2)的自润滑复合陶瓷涂层;涂层的摩擦系数随着硫盐浓度的升高呈现先下降后上升的趋势,当电解液中硫盐浓度为15 g/L时涂层的摩擦系数为0.15,较常规微弧氧化涂层降低了76%。涂层中的MoS_(2)分布在涂层的表面和内部,在与摩擦副接触与挤压的作用下形成均匀分布的MoS_(2)润滑膜,表现出良好的减摩性能。

The design and preparation of antifriction coating on the surface of aluminum alloy is one of the key technologies to improve the friction properties of aluminum alloy components.For the current problem of easy wear of aluminum alloy structural parts,nano-MoS_(2)was synthesized in situ on the surface of 6063 aluminum alloy by one-step micro-arc oxidation method to prepare MoS_(2)/Al_(2)O_(3)composite ceramic coating with antifriction effect.The effect of sulfur concentration on the composition,morphology and friction properties of the coating was discussed.The friction reducing mechanism of the coating was analyzed.The results show that the self-lubricating composite ceramic coating containing MoS_(2)is successfully prepared on the surface of 6063 aluminum alloy by micro-arc oxidation.The friction coefficient of the coating decreases first and then increases with the increase of the sulfur salt concentration.When the sulfur concentration in the electrolyte is 15 g/L,the friction coefficient of the coating is 0.15,which is reduced by 76%compared with the conventional micro-arc oxidation coating.The MoS_(2)in the coating is distributed on the surface and inside of the coating.Under the action of contact and extrusion with the friction pair,a uniformly distributed MoS_(2)lubricating film is formed,showing good antifriction performance.