Department of Microsystems Engineering, University of Freiburg, IMTEK, Georges-Koehler-Allee 103, Freiburg, Germany.
Langmuir. 2013 Apr 30;29(17):5207-13. doi: 10.1021/la400333d. Epub 2013 Apr 17.
The tribological properties of two steel surfaces rubbing against each other are measured while they are in contact with 1,3-diketones of varying structure. Such systems show after a short running-in period ultralow friction properties with a coefficient of friction of as low as μ = 0.005. It is suggested that the extremely favorable friction properties are caused by a tribochemical reaction between the 1,3-diketones and the steel surfaces, leading to formation of a chelated iron-diketo complex. The influence of temperature and the molecular structure of the 1,3 diketo-lubricants onto the friction properties of the system is elucidated under both static and dynamic conditions. With progression of the tribochemical reaction, the sliding surfaces become very conformal and smooth, so that the pressure is greatly reduced and further wear is strongly reduced. All iron particles potentially generated by wear during the initial running-in period are completely dissolved through complex formation. It is proposed that the tribochemical polishing reaction causes a transition from boundary lubrication to fluid lubrication.
两种钢表面在相互摩擦时的摩擦性能是在它们与不同结构的 1,3-二酮接触的情况下测量的。在短时间的磨合后，这些系统表现出超低摩擦特性，摩擦系数低至 μ = 0.005。据认为，极其有利的摩擦性能是由 1,3-二酮和钢表面之间的摩擦化学反应引起的，导致形成螯合铁-二酮配合物。在静态和动态条件下，研究了温度和 1,3 二酮润滑剂的分子结构对系统摩擦性能的影响。随着摩擦化学反应的进行，滑动表面变得非常一致和光滑，从而大大降低了压力，进一步减少了磨损。在初始磨合期间由于磨损而产生的所有铁颗粒都通过形成配合物而完全溶解。据推测，摩擦化学抛光反应导致从边界润滑到流体润滑的转变。
