基底材质对硅酸钠粘结MoS_2润滑涂层摩擦学性能的影响

Effect of Substrate Material on Tribological Behavior of Sodium Silicate Bonded MoS_2 Solid Lubricating Coatings

目的针对空间机械润滑处理的需求,研究硅酸钠粘结MoS2润滑涂层摩擦学性能。方法在几种不同材质基底的表面喷涂硅酸钠粘结MoS2润滑涂层,采用球盘摩擦磨损试验机研究其真空摩擦学性能和高温摩擦学性能,并利用红外光谱和扫描电镜对高温摩擦机理进行分析。结果几种基底表面润滑涂层的真空摩擦系数均低于0.1,且基底硬度越高,涂层的耐磨寿命越长,摩擦系数越低。在室温至300℃范围内,随温度的升高,涂层的摩擦系数先降低后升高,耐磨寿命先升高后降低。300℃时,涂层主要发生磨粒磨损。结论硅酸钠粘结MoS2润滑涂层能够用于经微弧氧化处理的铝合金基底表面,在200℃以下的大气环境和300℃氮气环境中的摩擦学性能优异。

Objective The tribological properties of sodium silicate bonded MoS2 solid lubricating coatings were studied as the lubricating requirement of the space machinery grows. Methods The friction and wear performances of the sodium silicate bonded MoS2 solid lubricating coatings on several kinds of substrate were studied by a ball-on-disc tribometer in vacuum condition. And the friction properties on 9Cr18 substrate at high temperature were also investigated. The morphologies of the wear trace on the coatings were investigated by surface profilometry and scanning electron microscopy, Results The results indicated that the friction coefficient of the lubricating coatings on the several kinds of substrate was lower than 0. 1 in vacuum condition. The friction coefficient decreased and the wear life increased as the hardness of the substrate increased in vacuum condition, The friction coefficient first increased and then decreased as the test temperature increased, But the wear life changed in an opposite way with temperature. The wear mechanisms of the coatings at 300 ℃ were adhesive and abrasive wear. Conclusion The lubricating coatings could be used on the surface of LY12 treated by micro-arc oxidation. The tribologieal properties were excellent at 200℃ in air and at 300℃ in nitrogen.