Formation and Nature of Carbon-Containing Tribofilms
Formation and Nature of Carbon-Containing Tribofilms
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DOI：
10.1021/acsami.8b22496
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发表时间：
2019-05-01
影响因子：
9.5
通讯作者：
Wang, Q. Jane
中科院分区：
文献类型：
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作者：
Wu, Hongxing;Khan, Arman Mohammad;Wang, Q. Jane
最大限度地减少摩擦界面上的摩擦和磨损仍然是一个挑战，这导致了最近在机械部件上使用涂层(如类金刚石碳(DLC))的激增。涂层方法的问题是涂层磨损寿命的限制。在这里，我们报告了一种润滑方法，在这种方法中，润滑性的、防磨损的含碳摩擦膜可以自我生成和补充，而不需要任何表面处理。这种含碳膜是在适度的滑动条件下，在由环丙烷酸作为添加剂的润滑剂中形成的，该添加剂溶解在聚α-烯烃基础油中。这些摩擦膜表现出相同的拉曼D和G信号，被解释为由于石墨或类金刚石膜的存在。我们的实验测量和反应分子动力学模拟表明，这些摩擦膜实际上是作为固体润滑剂的高分子量碳氢化合物。
Minimizing friction and wear at a rubbing interface continues to be a challenge and has resulted in the recent surge toward the use of coatings such as diamond-like carbon (DLC) on machine components. The problem with the coating approach is the limitation of coating wear life. Here, we report a lubrication approach in which lubricious, wear-protective carbon-containing tribofilms can be self-generated and replenishable, without any surface pretreatment. Such carbon-containing films were formed under modest sliding conditions in a lubricant consisting of cyclopropanecarboxylic acid as an additive dissolved in polyalphaolefin base oil. These tribofilms show the same Raman D and G signatures that have been interpreted to be due to the presence of graphite- or DLC films. Our experimental measurements and reactive molecular dynamics simulations demonstrate that these tribofilms are in fact high-molecular weight hydrocarbons acting as a solid lubricant.