Amann Tobias, Kailer Andreas, Oberle Natalie, Li Ke, Walter Michael, List Mathias, Rühe Jürgen
Fraunhofer Institute for Mechanics of Materials IWM, Woehlerstr. 11, 79108 Freiburg, Germany.
Wuhan University of Technology, National Engineering Research Center for Water Transport Safety, 1040 Heping Avenue, Wuhan 430063, China.
ACS Omega. 2017 Nov 28;2(11):8330-8342. doi: 10.1021/acsomega.7b01561. eCollection 2017 Nov 30.
Energy dissipation due to friction and wear is reducing the energy efficiency and reliability of mechanical systems. Thus, great efforts are being made to minimize friction for technical applications. In our present work, we investigate the tribological behavior of stainless steel 100Cr6 with a-C:H and a-C:H:Si coating lubricated with a surface-active formanisotropic 1,3-diketone. The results show that superlow friction can be achieved on the macroscale using a steel 100Cr6 self pairing (COF ∼ 0.005) and with 100Cr6 in combination with a-C:H coating (COF ∼ 0.008). Furthermore, the replacement of steel with a-C:H coating leads to a considerable decrease of wear. The reduced COF arises from the chemical interaction of the lubricant with the surface and nascent iron ions. It was found that interfacial parameters correlate with tribological results. In addition, the alignment of the formanisotropic molecules in the tribological contact at thin-film lubrication leads to an anisotropic viscosity with a minimum shear resistance in sliding direction. Atomistic simulation of tribochemical interactions was conducted to derive a friction model based on the thin-film lubrication theory. This investigation indicates the potential to substantially reduce friction and wear using this fluid in real technical applications.
摩擦和磨损导致的能量耗散正在降低机械系统的能源效率和可靠性。因此，人们正在大力努力将技术应用中的摩擦降至最低。在我们目前的工作中，我们研究了用表面活性的各向异性1,3 - 二酮润滑的具有非晶碳氢（a-C:H）和非晶碳氢硅（a-C:H:Si）涂层的100Cr6不锈钢的摩擦学行为。结果表明，使用100Cr6钢自配对（摩擦系数COF ∼ 0.005）以及100Cr6与a-C:H涂层组合（摩擦系数COF ∼ 0.008），在宏观尺度上可以实现超低摩擦。此外，用a-C:H涂层替代钢会导致磨损显著降低。摩擦系数的降低源于润滑剂与表面及新生铁离子的化学相互作用。研究发现界面参数与摩擦学结果相关。另外，在薄膜润滑的摩擦接触中，各向异性分子的排列导致了具有在滑动方向上最小剪切阻力的各向异性粘度。进行了摩擦化学相互作用的原子模拟，以基于薄膜润滑理论推导摩擦模型。这项研究表明在实际技术应用中使用这种流体大幅降低摩擦和磨损的潜力。
