Coordination Funds

在技术应用中，大多数摩擦学系统都是用流体润滑的，这些流体主要是油和润滑脂。在无法使用油或润滑脂润滑的情况下，例如在医疗技术、食品技术、使用真空工艺的生产工程和航空航天应用中，通常将固体作为替代品应用于部件表面。固体层的润滑机制与流体摩擦系统有根本的不同；例如，没有通常在流体润滑中发现的那种润滑回路。通常，材料从携带润滑剂的表面转移到对应体，形成转移层。在系统运行过程中，由于磨损过程导致的层退化不断发生，因此固体润滑层的更新或持续积聚机制同时起作用。虽然在较低接触压力的滑动运动领域，固体润滑及其功能已经有了更广泛的知识，但高负载接触表面（如滚动轴承或齿轮）上复杂的化学-物理相互作用迄今为止仅在有限程度上进行了研究。在本研究项目中，研究了摩擦系统在使用固体润滑剂润滑时由传递层形成引起的摩擦和磨损机制。为此，固体润滑剂的系统特定供应过程应根据操作条件（如温度、压力、滑动速度）来确定，以便能够保证在需要润滑的接触区域中固体润滑剂可用性的先决条件。根据运行条件，润滑剂和接触伙伴在高负荷接触中，传递过程要在此基础上加以澄清。在这里，可以区分物理转移过程和化学转移过程，它们可以使转移尽可能永久。物理粘附机制可以通过机械“钉接”固体润滑剂成分与表面来实现，化学机制可以基于物理和化学吸附。最后，这种理解将用于在高应力接触区域提供和适当转移固体润滑剂的系统的合成。研究的重点是高负荷滚动触点（压力> 100mpa）。然而，根据润滑概念，也可能有必要，例如，当使用润滑剂库时，在分析和建模中包括从这种低负荷接触中提供的润滑剂，以便调整库的磨损，使在高负荷接触中始终可以获得足够的固体润滑剂。

The majority of tribological systems in technical applications are lubricated with fluids, which are mostly oils and greases. In cases where lubrication with oil or grease is not possible, e.g. in medical technology, in food technology, in production engineering using vacuum processes and in aerospace applications, a solid is often applied to the component surface as an alternative.The lubrication mechanism in solid layers differs fundamentally from tribological systems with fluids; there is, for example, no lubricant circuit of the kind normally found in fluid lubrication. In general, material is transferred from the surface carrying the lubricant to the counterbody, forming transfer layers. During operation of the system, a layer degradation by wear processes takes place continuously, whereby mechanisms for the renewed or continuous build-up of the solid lubricant layer act at the same time. While in the field of sliding movements with lower contact pressures more extensive knowledge with solid lubrication and its functionality is already available, the complex chemical-physical interactions on the surfaces of highly loaded contacts, such as in rolling bearings or gears, have so far only been researched to a limited extent.In this research program, the mechanisms of friction and wear caused by transfer layer formation in tribological systems when lubricated with solid lubricants are to be investigated. For this purpose, system-specific provision processes of the solid lubricant are to be determined as a function of the operating conditions (e.g. temperature, pressure, sliding speeds) in order to be able to guarantee the prerequisites for the availability of solid lubricant in the contact area to be lubricated. Depending on the operating conditions, the lubricant and the contact partners in the highly loaded contact, the transfer processes are to be clarified on this basis. Here, a distinction can be made between physical and chemical transfer processes, which enable a transfer that is as permanent as possible. Physical adhesion mechanisms can be achieved by mechanical "stapling" of solid lubricant components with the surface, chemical mechanisms can be based on physi- and chemisorption. Finally, this understanding is to be used for the synthesis of systems for the provision and suitable transfer of solid lubricants in highly stressed contact areas.The focus of the investigations is on the highly loaded rolling contacts (pressure > 100 MPa). Depending on the lubrication concept, however, it may also be necessary, for example when using a lubricant depot, to include the provision of lubricant from such a less loaded contact in the analysis and modelling in order to adjust the wear of the depot in such a way that sufficient solid lubricant is always available in the highly loaded contact.