Torskaya Elena, Shkalei Ivan, Stepanov Fedor, Makhovskaya Yulia, Dyakonov Afanasy, Petrova Natalia
Ishlinsky Institute for Problems in Mechanics RAS, 119526 Moscow, Russia.
Department of Chemistry, North-Eastern Federal University, 677000 Yakutsk, Russia.
Polymers (Basel). 2024 Oct 11;16(20):2870. doi: 10.3390/polym16202870.
Frost-resistant rubbers retain their highly elastic properties over a wide temperature range. They are used in various friction units (e.g., seals), but their high friction coefficient and low wear resistance lead to the need for frequent replacement. In this paper, we propose applying thin (several hundred microns) UHMWPE coatings to formed rubber rings. The application technology depends on the required coating thickness. Friction tests of the coatings and pure UHMWPE were performed using the ball-on-disk (unidirectional sliding) scheme for various loads and velocities. In the experiments, the friction coefficients and temperatures near the contact area were determined. Friction tracks were studied using microscopy methods. The sliding contact of the ball and the two-layer material was modeled to obtain the dependences of the deformation component of friction on the sliding velocity for coatings of different thicknesses. UHMWPE is sensitive to frictional heating, so the thermal problem of determining the temperature in the contact area was also solved. It is shown that the minimum friction coefficient occurs for coatings with a thickness of 600 μm. At the same time, in the case of the 300 μm coating, the surface of the friction track is practically no different from the initial one. Thus, the studied combination of polymers provides antifrictional properties and wear resistance to the surface layer while maintaining the damping properties of rubber.
耐寒橡胶在很宽的温度范围内都能保持其高弹性性能。它们用于各种摩擦部件（如密封件），但其高摩擦系数和低耐磨性导致需要频繁更换。在本文中，我们建议在成型橡胶环上涂覆薄（几百微米）的超高分子量聚乙烯（UHMWPE）涂层。涂覆技术取决于所需的涂层厚度。使用球盘（单向滑动）方案对涂层和纯超高分子量聚乙烯进行了不同载荷和速度下的摩擦试验。在实验中，测定了接触区域附近的摩擦系数和温度。使用显微镜方法研究了摩擦轨迹。对球与双层材料的滑动接触进行了建模，以获得不同厚度涂层的摩擦变形分量与滑动速度的关系。超高分子量聚乙烯对摩擦热敏感，因此还解决了确定接触区域温度的热问题。结果表明，厚度为600μm的涂层摩擦系数最小。同时，对于300μm涂层，摩擦轨迹表面与初始表面几乎没有差异。因此，所研究的聚合物组合在保持橡胶阻尼性能的同时，为表面层提供了减摩性能和耐磨性。
