Abstract—

The properties of a semi-liquid lubricant (Lb) with additives were tested using a KT-2 oil testing machine; its stability and influence on the ‘wheel flange—rail’ friction pair was assessed. The analysis is based on laboratory wear tests of locomotive wheel flanges. Investigation of lubricants with additives showed their low colloidal stability, the highest oil release being observed with the addition of sulfo compounds and phospho additives. The thermal stability of lubricants with additives shows that at approximately 220°C the lubricants melt completely and turn into a liquid state. After conducting tribological tests on a KT-2 oil testing machine of a lubricant with a hydroquinone additive, white crystals formed on the surface of the facility. The dependence of the friction coefficient on the test temperature of the studied lubricant with additives was obtained. X-ray fluorescence analysis of the locomotive wheel flange surface showed a change in the concentration of chromium and manganese in the surface layer of the sample before and after bench tests, which may indicate the formation of a stable transfer layer providing good tribological properties. Empirical coefficients were obtained to determine the wear rate of the locomotive wheel flange for the studied additives.

中文翻译：

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含表面活性剂添加剂的半液体润滑剂的摩擦学性能

摘要-

使用KT-2油品试验机测试含添加剂的半液体润滑油（Lb）的性能；评估了其稳定性以及对“轮缘—钢轨”摩擦副的影响。该分析基于机车轮缘的实验室磨损测试。对含有添加剂的润滑剂的研究表明，它们的胶体稳定性较低，添加磺基化合物和磷添加剂时观察到最高的油释放量。含有添加剂的润滑剂的热稳定性表明，在大约 220°C 时，润滑剂完全熔化并变成液态。在KT-2油试验机上对含有对苯二酚添加剂的润滑油进行摩擦学测试后，设备表面形成白色晶体。获得了所研究的含有添加剂的润滑剂的摩擦系数与测试温度的关系。机车轮缘表面的 X 射线荧光分析显示，台架试验前后样品表层中铬和锰的浓度发生了变化，这可能表明形成了稳定的转移层，提供了良好的摩擦学性能。获得经验系数来确定所研究的添加剂的机车轮缘的磨损率。