Zhang Renhui, Chen Qi, Fan Xiaoqiang, He Zhongyi, Xiong Liping, Shen Mingxue
School of Materials Science and Engineering, East China JiaoTong University, Nanchang 330013, People's Republic of China.
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, People's Republic of China.
Langmuir. 2020 Apr 14;36(14):3887-3893. doi: 10.1021/acs.langmuir.9b03963. Epub 2020 Mar 18.
Alcohols are reported to have superlubricity at low loads during sliding; however, their lubricity under high loads has rarely been reported. Meanwhile, the lubrication mechanism of alcohols under high loads is still not well understood. Here, we first report the lubricity of methanol under 98 N and 1450 rpm and demonstrate the formation of graphene and fullerene-like nanostructures induced by tribochemical reactions. Results show that the lubrication mechanism was mainly attributed to the friction-induced graphene under boundary lubrication condition. Besides that, the wear rate of a YG8 hard alloy ball mainly occurred at the run-in processes, and the friction-induced graphene effectively inhibited further wear after the run-in processes. The formation mechanism of graphene was well investigated, and the flash temperature rise and catalyst (WC, WO, and WO) were the major causes for the formation of graphene.
据报道，醇类在滑动过程中的低负荷下具有超润滑性；然而，它们在高负荷下的润滑性鲜有报道。同时，醇类在高负荷下的润滑机制仍未得到很好的理解。在此，我们首次报道了甲醇在98 N和1450 rpm条件下的润滑性，并证明了摩擦化学反应诱导形成的石墨烯和类富勒烯纳米结构。结果表明，润滑机制主要归因于边界润滑条件下摩擦诱导的石墨烯。除此之外，YG8硬质合金球的磨损率主要发生在磨合过程中，摩擦诱导的石墨烯在磨合过程后有效抑制了进一步的磨损。对石墨烯的形成机制进行了深入研究，闪温升高和催化剂（WC、WO和WO）是石墨烯形成的主要原因。
