Podgursky Vitali, Bogatov Andrei, Yashin Maxim, Sobolev Sergey, Gershman Iosif S
Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia.
Department of Mechanical Engineering, Gubkin Russian State University of Oil and Gas, Leninsky Prospect 65, 119991 Moscow, Russia.
Entropy (Basel). 2018 Apr 13;20(4):279. doi: 10.3390/e20040279.
The study deals with tribological properties of diamond films that were tested under reciprocal sliding conditions against SiN balls. Adhesive and abrasive wear are explained in terms of nonequilibrium thermodynamic model of friction and wear. Surface roughness alteration and film deformation induce instabilities in the tribological system, therefore self-organization can occur. Instabilities can lead to an increase of the real contact area between the ball and film, resulting in the seizure between the sliding counterparts (degenerative case of self-organization). However, the material cannot withstand the stress and collapses due to high friction forces, thus this regime of sliding corresponds to the adhesive wear. In contrast, a decrease of the real contact area leads to the decrease of the coefficient of friction (constructive self-organization). However, it results in a contact pressure increase on the top of asperities within the contact zone, followed by material collapse, i.e., abrasive wear. Mentioned wear mechanisms should be distinguished from the self-lubricating properties of diamond due to the formation of a carbonaceous layer.
该研究涉及在往复滑动条件下与SiN球对磨测试的金刚石薄膜的摩擦学性能。依据摩擦与磨损的非平衡热力学模型对粘着磨损和磨粒磨损进行了解释。表面粗糙度变化和薄膜变形会引发摩擦学系统的不稳定性，因此可能会出现自组织现象。不稳定性会导致球与薄膜之间的真实接触面积增加，从而造成滑动副之间的咬死（自组织的退化情况）。然而，材料由于高摩擦力无法承受应力而发生破坏，所以这种滑动状态对应粘着磨损。相反，真实接触面积减小会导致摩擦系数降低（建设性自组织）。然而，这会导致接触区内微凸体顶部的接触压力增加，随后材料发生破坏，即磨粒磨损。上述磨损机制应与因形成含碳层而具有的金刚石自润滑特性区分开来。
