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学系统都用液体润滑，这些流体主要是油和油脂。如果不可能用油或油脂润滑，例如在医疗技术，食品技术，使用真空工艺和航空航天应用中的生产工程中，通常将固体作为替代方案应用于组件表面。固体层中的润滑机制从根本上与流体摩擦学系统不同。例如，没有在流体润滑中发现的那种润滑电路。通常，将材料从携带润滑剂到反体的表面转移，形成转移层。在系统操作过程中，通过磨损过程进行层降解，从而连续进行，从而同时使用固体润滑剂层的更新或连续堆积的机制。尽管在带有较低接触压力的滑动运动领域中，更广泛的知识及其功能已经可用，但在高载荷接触的表面上进行了复杂的化学物理相互作用，例如在滚动轴承或齿轮中，在迄今为止仅在有限的程度上对这项研究计划进行了有限的研究。为此，应确定固体润滑剂的系统特异性配置过程，这是工作条件（例如温度，压力，滑动速度）的函数，以便能够保证接触区域中固体润滑剂可用性的先决条件。根据操作条件，润滑剂和接触伙伴在高度负载的联系中，将在此基础上澄清转移过程。在这里，可以区分物理和化学转移过程，这使得能够尽可能永久的转移。可以通过机械“固定”固体润滑剂成分具有表面的机械“固定”来实现物理粘附机制，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中固体润滑剂提供和适当转移的系统。调查的重点是高度负载的滚动接触（压力> 100 MPA）。但是，根据润滑概念的不同，例如，在使用润滑剂仓库时，也可能有必要在分析和建模中包括从如此较低的接触中提供润滑剂，以便以足够的固体润滑剂的方式调整仓库的磨损，以便在高负载的接触中可用。