Sliding Friction-Induced Tribochemical Processes

在高负荷摩擦学接触中，可以观察到复杂的边界层动力学，例如受接触面，材料损失和磨损粉尘的影响。这些动力学与接触的宏观性质直接相关，如摩擦系数、磨损、温度和排放，并直接影响这些现象的动力学。这些相互依赖的部分原因是摩擦元素和磨损颗粒的摩擦化学过程。热不均匀性是这些摩擦化学过程的主要触发因素，并且可以由摩擦学接触中耗散能量的局部集中引起。这可以由边界层粒子局部浓度形成的临时接触岛引起。该项目的目的是开发考虑这些化学现象的方法，并研究它们对摩擦学输出参数的影响。各种方法的实施，如摩擦学测量，表征和分析表面形貌和表面化学，建模和仿真。对于这些调查，申请人生产了各种最小摩擦材料。为了系统地引起化学反应，特意选择了各种成分。摩擦学研究主要是在自行设计的高度自动化的摩擦计（AUT）上进行的。实现了多种表面分析方法，如EDX， XRD， SIMS， FIB-REM和TEM。这些密切相关的调查旨在证明识别化学过程和相关影响的潜力。这是通过最小混合物中组分的参数选择和变化来实现的。还应确定是否存在摩擦和磨损的整体动态可以受到化学影响的材料成分。申请者的目的是提高对这些耗散机制的理解，因为它们适用于高负荷接触的宏观摩擦。研究和表征摩擦化学边界层的一般程序将被开发出来，然后可以适用于各种高载荷摩擦副。

In high-load tribological contacts, complex boundary layer dynamics can be observed, which are influenced for example by the contacting surfaces, material loss, and wear dust. These dynamics are directly related to macroscopic properties of the contact, such as the friction coefficient, wear, temperature, and emissions, and directly influence the dynamics of these phenomena. These interdependencies result in part from tribochemical processes on the friction elements and wear particles. Thermal inhomogeneities are the primary trigger for these tribochemical processes, and can result from local concentrations of dissipation energy in the tribological contact. This can be brought about by temporary contact islands which are formed from local concentrations of boundary layer particles.The aim of this project is to develop approaches for considering these chemical phenomena, and to investigate their influence on tribological output parameters. Various methodologies are implemented, such as tribological measurements, characterization and analysis of surface topography and surface chemistry, modeling, and simulation. For these investigations, a variety of minimal friction materials are produced by the applicants. Various components are specifically chosen in order to systematically evoke chemical reactions. The tribological investigations are primarily carried out on a self-designed, highly automated tribometer (AUT). A variety of surface analysis methods are implemented, e.g. EDX, XRD, SIMS, FIB-REM and TEM. These closely interlinked investigations are intended to demonstrate the potential for identifying chemical processes and the associated influences. This is achieved through parameter selection and variation of the components in the minimal mixtures. It should also be determined whether there are material components with which the global dynamics of friction and wear can be chemically influenced. The applicants aim to improve the understanding of these dissipation mechanisms as they apply to macroscopic friction in high-load contacts. A general procedure for the investigation and characterization of tribochemical boundary layers is to be developed, which could then be applicable to various high-load friction pairs.