Kharanzhevskiy Evgeny V, Ipatov Aleksey G, Makarov Aleksey V, Gil'mutdinov Faat Z
Udmurt State University, Universitetskaya St., 1, Izhevsk, Russia.
Udmurt State Agricultural University, Studencheskaya St., 11, Izhevsk, Russia.
Sci Rep. 2023 Oct 13;13(1):17362. doi: 10.1038/s41598-023-44702-6.
Plain bearings, renowned for their versatility and simplicity, are extensively utilized in engineering design across various industries involving moving parts. Lubrication is vital to the functioning of these bearings, yet their usage is inhibited under dynamic load conditions, or at elevated or reduced temperatures due to this dependency on lubrication. This study introduces an innovative method to significantly mitigate friction and wear in plain bearings operating without lubrication. The plain bearings were constructed from steel-bronze pairs, where the steel shafts were alloyed with bismuth oxide via short-pulse laser treatment. MnO was utilized as a carrier to incorporate the bismuth oxide into the surface layers of the steel. Insights from transmission electron microscopy and X-ray photoelectron spectroscopy revealed a highly non-equilibrium state of matter, unattainable through conventional engineering methods. The tribological performance of the modified steel disks was assessed via a block-on-ring sliding test, demonstrating superior wear and friction performance without lubrication, as well as an ultra-low coefficient of friction. Remarkably, the modified friction pairs remained functional after 200 km of linear sliding at a load of 250 N (12.5 MPa) and a sliding speed of 9 m/s. To substantiate the technique's viability, we tested the performance of an internal combustion engine turbocharger fitted with a modified steel shaft. The turbocharger's performance validated the long-term effectiveness of the steel-bronze coupling operating without lubrication at 75,000 rpm. The simplicity and resilience of this technique for modifying steel-bronze pairs offer a ground-breaking and promising approach for a wide range of applications.
滑动轴承以其多功能性和简单性而闻名，广泛应用于涉及运动部件的各个行业的工程设计中。润滑对于这些轴承的运行至关重要，然而，由于对润滑的依赖，在动态负载条件下，或在高温或低温环境中，它们的使用会受到限制。本研究引入了一种创新方法，可显著减轻无润滑运行的滑动轴承中的摩擦和磨损。滑动轴承由钢-青铜副制成，其中钢轴通过短脉冲激光处理与氧化铋合金化。利用MnO作为载体将氧化铋掺入钢的表层。透射电子显微镜和X射线光电子能谱的分析结果揭示了一种高度非平衡的物质状态，这是传统工程方法无法实现的。通过块-环滑动试验评估了改性钢盘的摩擦学性能，结果表明其在无润滑情况下具有优异的磨损和摩擦性能，以及超低的摩擦系数。值得注意的是，改性摩擦副在250 N（12.5 MPa）的载荷和9 m/s的滑动速度下进行200 km的线性滑动后仍能正常工作。为了证实该技术的可行性，我们测试了配备改性钢轴的内燃机涡轮增压器的性能。涡轮增压器的性能验证了钢-青铜联轴器在75000 rpm下无润滑运行的长期有效性。这种改性钢-青铜副技术的简单性和耐用性为广泛的应用提供了一种开创性的、有前景的方法。
