Coordination Funds

在技术应用中，大多数摩擦学系统都是用油和润滑脂作为润滑剂进行润滑的。在不可能用油或润滑脂进行润滑的情况下，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材料应用于部件表面。固体层中的润滑机理与具有流体的摩擦学系统有根本的不同；例如，没有通常在流体润滑中发现的那种润滑剂回路。通常，材料从承载润滑剂的表面转移到对应体，形成传送层。在系统运行期间，磨损过程导致的层退化持续发生，从而使固体润滑层的更新或持续堆积的机构同时起作用。虽然在接触压力较低的滑动运动领域已经有了关于固体润滑剂及其功能的更广泛的知识，但对于高载荷接触表面的复杂的化学-物理相互作用，如滚动轴承或齿轮，到目前为止还只进行了有限的研究。在本研究计划中，将研究在固体润滑剂润滑的摩擦学系统中由于转移层的形成而导致的摩擦磨损机理。为此，应根据运行条件(例如温度、压力、滑动速度)确定固体润滑剂的系统特定供应过程，以便能够保证在要润滑的接触区域中固体润滑剂的可用性的先决条件。根据操作条件、润滑剂和高负载触点中的接触伙伴，应在此基础上阐明转移过程。在这里，可以区分物理转移过程和化学转移过程，这两种过程使转移尽可能持久。物理粘着机理可以通过机械地将固体润滑剂部件与表面装订来实现，化学机理可以基于物理吸附和化学吸附来实现。最后，这一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接触(压力&gt；100兆帕)。然而，根据润滑概念的不同，例如在使用润滑剂仓库时，可能也有必要在分析和建模中包括从这种负载较少的触点提供润滑剂，以便以这样一种方式调整仓库的磨损，即在高负载的触点中始终有足够的固体润滑剂可用。

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.