Caessa Jorge, Vuchkov Todor, Yaqub Talha Bin, Cavaleiro Albano
Department of Mechanical Engineering, CEMMPRE, University of Coimbra, Rua Luís Reis dos Santos, 3030-788 Coimbra, Portugal.
LED & MAT-IPN-Laboratory for Wear, Testing and Materials, Instituto Pedro Nunes, Rua Pedro Nunes, 3030-199 Coimbra, Portugal.
Materials (Basel). 2021 Mar 10;14(6):1336. doi: 10.3390/ma14061336.
Friction and wear contribute to high energetic losses that reduce the efficiency of mechanical systems. However, carbon alloyed transition metal dichalcogenide (TMD-C) coatings possess low friction coefficients in diverse environments and can self-adapt to various sliding conditions. Hence, in this investigation, a semi-industrial magnetron sputtering device, operated in direct current mode (DC), is utilized to deposit several molybdenum-selenium-carbon (Mo-Se-C) coatings with a carbon content up to 60 atomic % (at. %). Then, the carbon content influence on the final properties of the films is analysed using several structural, mechanical and tribological characterization techniques. With an increasing carbon content in the Mo-Se-C films, lower Se/Mo ratio, porosity and roughness appeared, while the hardness and compactness increased. Pin-on-disk (POD) experiments performed in humid air disclosed that the Mo-Se-C vs. nitrile butadiene rubber (NBR) friction is higher than Mo-Se-C vs. steel friction, and the coefficient of friction (CoF) is higher at 25 °C than at 200 °C, for both steel and NBR countersurfaces. In terms of wear, the Mo-Se-C coatings with 51 at. % C showed the lowest specific wear rates of all carbon content films when sliding against steel. The study shows the potential of TMD-based coatings for friction and wear reduction sliding against rubber.
摩擦和磨损会导致能量大量损失，从而降低机械系统的效率。然而，碳合金化过渡金属二硫属化物（TMD-C）涂层在多种环境中具有低摩擦系数，并且能够自适应各种滑动条件。因此，在本研究中，使用以直流模式（DC）运行的半工业磁控溅射设备来沉积几种碳含量高达60原子百分比（at.%）的钼-硒-碳（Mo-Se-C）涂层。然后，使用几种结构、力学和摩擦学表征技术来分析碳含量对薄膜最终性能的影响。随着Mo-Se-C薄膜中碳含量的增加，Se/Mo比、孔隙率和粗糙度降低，而硬度和致密性增加。在潮湿空气中进行的销盘（POD）实验表明，Mo-Se-C与丁腈橡胶（NBR）之间的摩擦高于Mo-Se-C与钢之间的摩擦，并且对于钢和NBR对偶表面，在25°C时的摩擦系数（CoF）高于200°C时的摩擦系数。在磨损方面，当与钢滑动时，碳含量为51 at.%的Mo-Se-C涂层在所有碳含量薄膜中显示出最低的比磨损率。该研究展示了基于TMD的涂层在与橡胶滑动时减少摩擦和磨损的潜力。
