In today's mobility applications, efficiency is a key requirement. While in conventional mobility, increased efficiency contributes to reduce greenhouse gas emissions, in e-mobility every increase in efficiency translates also directly into increased battery range, which in turn contributes to reduced CO₂ emission. Therefore, different approaches like the reduction of lubricant viscosities and the reduction of lubricant quantities towards minimum quantity lubrication are pursued. A promising approach to meet the increasing demands are (Cr,Al)N and triboactive (Cr,Al,Mo)N coatings.

Within this work (Cr,Al)N and triboactive (Cr,Al,Mo)N coatings were investigated in a twin-disk test rig in highly-loaded rolling-sliding contacts. The coatings were deposited by means of cathodic arc evaporation (CAE) on the case hardened steel (AISI 5115) and tribologically investigated under minimum quantity (MQL) lubrication with a low viscosity, sulphur and phosphorous doped, polyalphaolefine oil. Compared to the uncoated steel, the coatings lead to a higher system stability, which can be characterized by a stable friction behavior, and wear reduction. Tribochemical interactions between coatings and lubricant were analyzed by means of Raman spectroscopy and reveal the in situ formation of MoS₂. Furthermore, the coatings exhibit lower thermal conductivities compared to the uncoated steel, which might also affect friction reduction. The results show the high potential of (Cr,Al)N and triboactive (Cr,Al,Mo)N coatings under high tribological load.

在当今的移动应用中，效率是关键要求。在传统的出行方式中，提高效率有助于减少温室气体排放，而在电动出行方式中，每提高一次效率也直接转化为增加的电池续航里程，进而有助于减少CO ₂排放。因此，寻求不同的方法，诸如降低润滑剂粘度和朝最小量润滑降低润滑剂量。满足日益增长的需求的一种有前途的方法是（Cr，Al）N和摩擦活性（Cr，Al，Mo）N涂层。

在这项工作中，在高负荷的滚动滑动接触器的双盘试验台上研究了（Cr，Al）N和摩擦活性（Cr，Al，Mo）N涂层。通过阴极电弧蒸发（CAE）将涂层沉积在表面硬化钢（AISI 5115）上，并在最小量（MQL）润滑下用低粘度硫和磷掺杂的聚α烯烃油进行了摩擦学研究。与未涂层的钢相比，涂层具有更高的系统稳定性，其特征在于稳定的摩擦性能和减少的磨损。通过拉曼光谱分析了涂层与润滑剂之间的摩擦化学相互作用，并揭示了MoS _2的原位形成。此外，与未涂层的钢相比，涂层表现出较低的热导率，这也可能会降低摩擦。结果表明，在高摩擦载荷下，（Cr，Al）N和摩擦活性（Cr，Al，Mo）N涂层具有很高的潜力。