In this study, the effects of using coke dust in brake pad mixtures against the problem of friction coefficient reduction occurring at high temperatures in railway vehicle brake pads were investigated. For this purpose, the average friction coefficients and wear rates of the brake pads produced by using different amounts of coke dust were tested with the help of a dynamometer at different temperature values and the brake pad mixture containing coke dust with optimum ratio was determined. Brake pads with optimum coke dust ratio were tested in a train set under real railway conditions and the stopping distances of the train set and the temperatures during braking were measured. Using the stopping distances measured during railway tests and the average friction coefficients of the brake pads were analyzed analytically and compared with the dynamometer results. As a result of these tests, it has been observed that the coke dust material reduces the friction coefficient at low temperatures, but increases the friction coefficient at high temperatures and significantly reduces the amount of wear.

中文翻译：

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用焦粉制成的复合垫对铁路车辆褪色问题的分析和实验研究

在这项研究中，研究了在刹车片混合物中使用焦粉对铁路车辆刹车片在高温下摩擦系数降低问题的影响。为此，借助测功机在不同温度值下测试了使用不同焦粉量生产的刹车片的平均摩擦系数和磨损率，并确定了含有最佳比例焦粉的刹车片混合物。在真实铁路条件下的列车组中测试了具有最佳焦尘比的刹车片，并测量了列车的停车距离和制动过程中的温度。使用铁路试验期间测量的制动距离和刹车片的平均摩擦系数进行分析分析，并与测功机结果进行比较。作为这些测试的结果，已经观察到焦粉材料降低了低温下的摩擦系数，但增加了高温下的摩擦系数并显着减少了磨损量。