Härtwig Fabian, Lorenz Lars, Makowski Stefan, Krause Matthias, Habenicht Carsten, Lasagni Andrés Fabián
Institut für Fertigungstechnik, Technische Universität Dresden, 01069 Dresden, Germany.
Coating Characterization, Fraunhofer Institute for Material and Beam Technology IWS, 01277 Dresden, Germany.
Materials (Basel). 2022 Mar 30;15(7):2534. doi: 10.3390/ma15072534.
Vacuum environments provide challenging conditions for tribological systems. MoS2 is one of the materials commonly known to provide low friction for both ambient and vacuum conditions. However, it also exhibits poor wear resistance and low ability to withstand higher contact pressures. In search of wear-resistant alternatives, superhard hydrogen-free tetrahedral amorphous carbon coatings (ta-C) are explored in this study. Although known to have excellent friction and wear properties in ambient atmospheres, their vacuum performance is limited when self-paired and with steel. In this study, the influence of the paired material on the friction behavior of ta-C is studied using counterbodies made from brass, bronze, copper, silicon carbide, and aluminum oxide, as well as from steel and ta-C coatings as reference materials. Brass was found to be the most promising counterbody material and was further tested in direct comparison to steel, as well as in long-term performance experiments. It was shown that the brass/ta-C friction pair exhibits low friction (µ < 0.1) and high wear in the short term, irrespective of ambient pressure, whereas in the long term, the friction coefficient increases due to a change in the wear mechanism. Al2O3 was identified as another promising sliding partner against ta-C, with a higher friction coefficient than that of brass (µ = 0.3), but considerably lower wear. All other pairings exhibited high friction, high wear, or both.
真空环境给摩擦学系统带来了具有挑战性的条件。二硫化钼是一种在环境和真空条件下都能提供低摩擦的常见材料。然而，它的耐磨性也很差，承受较高接触压力的能力较低。为了寻找耐磨的替代材料，本研究探索了超硬无氢四面体非晶碳涂层（ta-C）。尽管已知其在环境气氛中具有优异的摩擦和磨损性能，但当与自身配对以及与钢配对时，其真空性能有限。在本研究中，使用由黄铜、青铜、铜、碳化硅和氧化铝制成的配对体以及钢和ta-C涂层作为参考材料，研究了配对材料对ta-C摩擦行为的影响。发现黄铜是最有前景的配对体材料，并将其与钢进行直接比较以及进行长期性能实验。结果表明，黄铜/ta-C摩擦副在短期内表现出低摩擦（μ<0.1）和高磨损，与环境压力无关，而从长期来看，由于磨损机制的变化，摩擦系数会增加。氧化铝被确定为另一种与ta-C配对的有前景的滑动副，其摩擦系数高于黄铜（μ = 0.3），但磨损要低得多。所有其他配对都表现出高摩擦、高磨损或两者兼而有之。
