Kong Ning, Zhang Jiaming, Zhang Jie, Li Hongbo, Wei Boyu, Li Dongshan, Zhu Hongtao
School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China.
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000, China.
Nanomaterials (Basel). 2020 Apr 2;10(4):665. doi: 10.3390/nano10040665.
Hot rolling of titanium alloy currently is carried out without lubrication because of the surface defects. In order to explore an effective lubrication scheme to reduce friction and wear during hot rolling of titanium alloy, a mixed graphene-incorporating lubricant has been proposed to study its lubrication performance and mechanism. The tribological experiments were carried out by ball-disk friction and wear tester under hot-rolling parameters. Scanning electron microscopy (SEM), X-ray energy spectrum analyzer (EDS), X-ray powder diffractometer (XRD) and Raman analysis were used to analyse the surface and cross-section of the wear marks on the samples after the tribological experiments. The results show that the friction coefficient decreases up to about 35% compared with tests under dry and lubricated conditions. The surface quality of the wear marks is improved significantly after applying the proposed lubricant. The graphene which is embedded in the phosphate film can be effectively applied as a lubricating material to strengthen the lubricating film with less combustion loss at high temperatures. A chemical- and mechanical-induced lubrication mechanism for the hot rolling of titanium sheets has been proposed due to the synergistic lubrication effect of the graphene, ZrO nano particles and phosphate. It is of great significance and potential value to apply this proposed lubricant as an effective way to reduce the wear, friction and oxidation during the hot-rolling process of titanium alloy.
由于表面缺陷，目前钛合金热轧是在无润滑条件下进行的。为了探索一种有效的润滑方案以减少钛合金热轧过程中的摩擦和磨损，提出了一种含石墨烯的混合润滑剂来研究其润滑性能及机理。在热轧参数下，通过球盘摩擦磨损试验机进行摩擦学实验。摩擦学实验后，利用扫描电子显微镜（SEM）、X射线能谱分析仪（EDS）、X射线粉末衍射仪（XRD）和拉曼分析对样品磨损痕迹的表面和横截面进行分析。结果表明，与干摩擦和有润滑条件下的试验相比，摩擦系数降低了约35%。使用所提出的润滑剂后，磨损痕迹的表面质量得到显著改善。嵌入磷酸盐膜中的石墨烯可有效用作润滑材料，以增强润滑膜，且在高温下燃烧损失较小。由于石墨烯、ZrO纳米颗粒和磷酸盐的协同润滑作用，提出了一种钛板热轧的化学和机械诱导润滑机制。将所提出的润滑剂作为减少钛合金热轧过程中的磨损、摩擦和氧化的有效方法具有重要意义和潜在价值。
