Coordination Funds

协调基金

• 批准号: 404647253
• 负责人: Professor Dr.-Ing. Bernd Sauer
• 金额: --
• 依托单位: Lehrstuhl für Maschinenelemente und Getriebetechnik (MEGT)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/404647253?language=en
• 关键词: Coordination; Funds

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.

技术应用中的大多数摩擦系统都是用流体润滑的，其中大部分是油和油脂。在无法使用油或油脂润滑的情况下，例如在医疗技术、食品技术、使用真空工艺的生产工程以及航空航天应用中，通常将固体作为替代方案应用于部件表面。固体层中的润滑机制与流体摩擦系统有根本的不同；例如，没有流体润滑中常见的润滑回路。一般来说，材料从携带润滑剂的表面转移到相对体，形成转移层。在系统运行期间，磨损过程导致的层退化不断发生，由此固体润滑剂层的更新或连续形成的机制同时起作用。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及其功能的更广泛的知识，但高负荷接触表面（例如滚动轴承或齿轮）上复杂的化学物理相互作用迄今为止仅在本研究项目中，将研究固体润滑剂润滑时摩擦系统中转移层形成引起的摩擦和磨损的机制。为此，应根据工作条件（例如温度、压力、滑动速度）确定固体润滑剂的系统特定提供过程，以便能够保证在系统中提供固体润滑剂的先决条件。接触区域需润滑。根据工作条件、润滑剂和高负载接触中的接触伙伴，应在此基础上明确传输过程。这里，可以区分物理和化学转移过程，这使得转移尽可能永久。物理粘附机制可以通过将固体润滑剂组分与表面机械“钉合”来实现，化学机制可以基于物理和化学吸附。最后，这种理解将用于合成在高应力接触区域提供和适当传输固体润滑剂的系统。研究的重点是高负载滚动接触（压力> 100 MPa）。然而，根据润滑概念，例如在使用润滑剂库时，也可能有必要在分析和建模中包括从这种负载较小的接触提供润滑剂，以便在这种情况下调整库的磨损。一种在高负载接触中始终有足够的固体润滑剂的方法。