Tribological transfer mechanisms and large area micro-contact simulation of solid lubricant supply from PVD layers for dry running gear stages

“干运转齿轮阶段PVD涂层固体润滑剂供应的摩擦学传递机制和大面积微接触模拟”项目的第二个资助期旨在研究DFG优先计划2074“具有高机械负荷的无流体润滑系统”中纯固体润滑、高负荷齿轮阶段的瞬时负荷。在第一个供资期间，进行了模型和齿轮类比试验，以系统地调查涂层和基材的组合，从而建立了一个关于有希望的变种的摩擦学行为的数据库。特别是，用高功率脉冲磁控溅射(HPPMS)沉积的基于MoSx的双层涂层系统在齿侧模拟试验中显示出可容忍的表面压力高达1.6 Gpa，摩擦系数降低到0.02。因此，在4个工作领域内计划的活动的目标是进一步开发这些系统，并确定真正的摩擦学系统“齿轮”中的其他影响。一方面，这包括现场1的试件的生产、涂层和初始表征，这些试件在现场2进行了详细的测试和表征。重点是在齿轮试验台上进行的测试和磨损分析，以及机械涂层性能的高温测量和循环载荷下的疲劳抗力分析。第三个领域的工作扩展了第一个资助期的微接触模拟，特别关注干式运转齿面的接触特性。在工作领域4，综合了第一个和第二个资助期的结果，以便一方面确定齿面接触的额外影响，另一方面制定使用固体润滑系统的战略和评估标准。在这一点上，与优先方案的其他项目相互作用，以增加这类润滑系统的可比性。

The proposed second funding period of the project "Tribological transfer mechanisms and large-area microcontact simulation of solid lubricant supply from PVD coatings for dry-running gear stages" aims to investigate the transient loads in exclusively solid-lubricated, highly loaded gear stages within the DFG priority program 2074 "Fluid-free lubrication systems with high mechanical loads". In the first funding period, model- and gear analogy tests were carried out to systematically investigate coating and substrate material combinations, so that a database exists regarding the tribological behaviour of promising variants. In particular, two-layer coating systems based on MoSX and deposited by high power impulse magnetron sputtering (HPPMS) showed tolerable surface pressures of up to 1.6 GPa in the tooth flank analogy test, with a reduction of the friction coefficient to 0.02. The planned activities within 4 work fields are therefore targeted on a further development of the systems and the identification of additional effects in the real tribological system "gear". On the one hand, this includes the production, coating and initial characterisation of test specimens in work field 1, which are tested and characterised in detail in work field 2. The focus is on tests on the gear test rig in combination with a wear analysis, supplemented by high-temperature measurements of the mechanical coating properties and analyses of the fatigue resistance under cyclic loading. The third field of work extends the microcontact simulation of the first funding period, with a special focus on the contact properties of dry-running tooth flanks. In work field 4, the results from the first and second funding periods are combined in order to identify additional effects in the tooth flank contact on the one hand and to derive strategies and evaluation criteria for the use of solid lubricated systems on the other. At this point, there is an interaction with the other projects of the priority programme in order to increase the comparability of this type of lubrication systems.