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首页> 外文期刊>Tribology letters >Effect of water adsorption on microtribological properties of hydrogenated diamond-like carbon films
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Effect of water adsorption on microtribological properties of hydrogenated diamond-like carbon films

机译：吸水率对类金刚石碳膜氢化性能的影响

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Microtribological properties of diamond-like carbon (DLC) films in the presence of water molecule have been studied. The amount of water adsorbed on DLC films was measured by the quartz crystal microbalance (QCM), while microtribological properties of the film were evaluated by an environment-controlled microtribometer. The hydrogenated-DLC showed an advancing water contact angle of 97°, indicating a relatively hydrophobic surface. No hysteresis in adsorption and desorption isotherms were observed. This suggests an absence of micropores at the DLC surface. The greatest adhesion and friction forces between a W-tip and DLC films deposited onto QCM were observed at a water coverage of 2-3 monolayers, which corresponds to a relative humidity of 70-80%. This abrupt increase in adhesion was explained by the generation of a meniscus from the condensed water between tip and DLC surface. The atomically flat DLC surface showed maximum adhesion and friction forces at lower humidity than those of DLC on OCM, implying the importance of surface texturing, which reduces the effect of water condensation.
机译：研究了在水分子存在下类金刚石碳（DLC）薄膜的微摩擦学性能。通过石英晶体微量天平（QCM）测量吸附在DLC膜上的水量，同时通过环境控制的微摩擦计评估膜的微摩擦学性能。氢化的DLC显示出前进的水接触角为97°，表明相对疏水的表面。在吸附和解吸等温线中没有观察到滞后现象。这表明在DLC表面上没有微孔。在2-3个单层的水覆盖率下，观察到W-tip和DLC膜沉积在QCM膜之间的最大粘附力和摩擦力，这对应于70-80％的相对湿度。这种粘附力的突然增加是由尖端和DLC表面之间的冷凝水产生的弯液面造成的。与DLC在OCM上相比，原子平坦的DLC表面在较低的湿度下显示出最大的附着力和摩擦力，这表明表面纹理化的重要性，这降低了水凝结的影响。

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