Acid Treatment of Diamond-Like Carbon Surfaces for Enhanced Adsorption of Friction Modifiers and Friction Performance
Acid Treatment of Diamond-Like Carbon Surfaces for Enhanced Adsorption of Friction Modifiers and Friction Performance
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DOI：
10.1007/s11249-018-1081-3
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发表时间：
2018-12-01
影响因子：
3.2
通讯作者：
Wang, Q. Jane
中科院分区：
文献类型：
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作者：
Khan, Arman Mohammad;He, Xingliang;Wang, Q. Jane
类金刚石碳 (DLC) 是一类无定形碳材料，用作摩擦部件中的耐磨涂层。 DLC 表面的化学惰性虽然在许多应用中很重要，但使其与商用润滑油中的添加剂不相容。具体来说，DLC 表面不允许强烈吸附摩擦改进剂分子。本研究旨在通过酸处理提高这些摩擦改性剂分子在 DLC 表面上的吸附。水接触角测量表明，这种处理可以提高 DLC 的亲水性。 XPS 分析表明，经过酸处理后，DLC 上 ArmeenT（一种有机摩擦改进剂）的吸收量增加了 50%。 ArmeenT 吸附量的增加伴随着微尺度摩擦实验中摩擦力的显着降低。
Diamond-like carbon (DLC) is a class of amorphous carbon materials used as wear-resistant coatings in tribo-components. The chemical inertness of DLC surfaces, while important in many applications, makes them incompatible with additives in commercial lubricants. Specifically, DLC surfaces do not permit strong adsorption of friction modifier molecules. This study aims at improving the adsorption of these friction modifier molecules on DLC surfaces through an acid treatment. Water contact angle measurements show that such a treatment results in improved hydrophilicity of the DLC. XPS analysis demonstrates 50% increase in the uptake of ArmeenT, an organic friction modifier, on DLC after the acid treatment. This increased ArmeenT adsorption is accompanied by marked decrease in friction in micro-scale friction experiments.