Wu Hongxing, Khan Arman Mohammad, Johnson Blake, Sasikumar Kiran, Chung Yip-Wah, Wang Q Jane
Key Laboratory of Education Ministry for Modern Design and Rotor Bearing Systems , Xi'an Jiaotong University , Xi'an 710049 , P. R. China.
Avant-Garde Materials Simulation , Deutschland GmbH , Merzhausen 79249 , Germany.
ACS Appl Mater Interfaces. 2019 May 1;11(17):16139-16146. doi: 10.1021/acsami.8b22496. Epub 2019 Apr 17.
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.
将摩擦副界面的摩擦与磨损降至最低仍是一项挑战，这也促使近期人们在机械部件上大量使用诸如类金刚石碳（DLC）等涂层。涂层方法的问题在于涂层磨损寿命有限。在此，我们报道一种润滑方法，通过该方法可在无需任何表面预处理的情况下，自行生成并补充具有润滑性和耐磨保护作用的含碳摩擦膜。此类含碳膜是在适度滑动条件下，于一种由溶解在聚α烯烃基础油中的环丙烷羧酸作为添加剂构成的润滑剂中形成的。这些摩擦膜展现出与拉曼D峰和G峰相同的特征，以往认为这是由于存在石墨或DLC膜所致。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。
