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Tribological characterisation of hard coatings with and without DLC top layer in fretting tests

机译：微动试验中有无DLC顶层的硬涂层的摩擦学表征

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摘要

The potential of coatings to protect components against wear and to reduce friction has led to a large variety of protective coatings. In order to check the success of coating modifications and to find solutions for different purposes, initial tests with laboratory tribometers are usually done to give information about the performance of a coating. Different Ti-based coatings (TiN, Ti(C,N), and TiAlN) and NiP were tested in comparison to coatings with an additional diamond-like carbon (DLC) top coating. Tests were done in laboratory air at room temperature with oscillating sliding (gross slip fretting) with a ball-on-disc arrangement against a ceramic ball (Al_2O_3). Special attention was paid to possible effects of moisture (relative humidity). The coefficient of friction was measured on line, and the volumetric wear at the disc was determined after the test from microscopic measurements of the wear scar and additional profiles. The friction and wear behaviour is quite different for the different coatings and depends more or less on the relative humidity. The DLC coating on top of the other coatings reduces friction and wear considerably. In normal and in moist air the coefficient of wear of the DLC top-layer coating is significantly less than 10~(-6) mm~3/Nm and the coefficient of friction is below 0.1. In dry air, however, there is a certain tendency to high wear and high friction.
机译：涂层在保护组件免受磨损和减少摩擦方面的潜力已经导致了各种各样的保护涂层。为了检查涂层改性的成功性并找到用于不同目的的解决方案，通常使用实验室摩擦计进行初始测试以提供有关涂层性能的信息。与具有额外的类金刚石碳（DLC）顶部涂层的涂层相比，测试了不同的基于Ti的涂层（TiN，Ti（C，N）和TiAlN）和NiP。测试是在实验室空气中于室温下进行的，其中在陶瓷球（Al_2O_3）上以盘上球的方式进行了振动滑动（大滑动微动）。特别注意了水分（相对湿度）的可能影响。在线测量摩擦系数，并在测试后根据磨损痕迹和其他轮廓的微观测量结果确定圆盘处的体积磨损。对于不同的涂层，摩擦和磨损行为是完全不同的，并且或多或少地取决于相对湿度。其他涂层顶部的DLC涂层可大大减少摩擦和磨损。在正常和潮湿空气中，DLC顶层涂层的磨损系数明显小于10〜（-6）mm〜3 / Nm，摩擦系数低于0.1。然而，在干燥的空气中，存在一定的高磨损和高摩擦趋势。

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