Generation and Preconditioning of Aluminium Matrix Composite Friction Surfaces of Braking Discs

制动盘铝基复合摩擦面的生成与预处理

• 批准号: 414236319
• 负责人: Professor Dr.-Ing. Thomas Lampke
• 金额: --
• 依托单位: Daimler AG
• 依托单位国家: 德国
• 项目类别: Research Grants (Transfer Project)
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/414236319?language=en
• 关键词: Generation; Preconditioning; Aluminium; Matrix; Composite

In the industrialised countries, transport plays a significant role in the generation of emissions, which result in addition to the combustion of the fuel from the abrasion of tires and brake system components. A hitherto comparatively little considered tribological system are the braking systems of passenger cars, contributing significantly to brake dust emissions into the environment. Currently, brake discs made of cast iron are used in the vast majority of cars. However, in addition to the brake pads they are subject to significant wear.The application of particle-reinforced aluminium matrix composites (AMCs) is intended in particular to considerably reduce the wear of both the brake disc and the brake pad. A large-scale use of such a braking system in motor vehicles is still not possible, since on the one hand, basic tribological relationships are poorly understood. On the other hand, suitable finishing processes for the generation of functional surfaces (friction surfaces) at the AMCs are missing. The primary goal of the project is therefore to gain a deeper understanding of the interactions in the tribological system consisting of the brake disc and the brake pad. In this case, the surface properties resulting from the specific finishing of the brake discs as well as a preconditioning of the brake discs are to be taken into account. In the end, the wear mechanisms occurring in relevant loading regimes shall be understood. This can only be achieved through an interdisciplinary research approach, uniting material and production engineering work.An important research goal is the creation of knowledge for a largely damage-free and appropriate surface generation of AMCs for the application as a brake disc friction surface. The focus of the tribological investigations lies on fundamental mechanisms of action between the surface properties, a preconditioning (controlled production of tribological films), as well as its running-in and wear behaviour. For preconditioning, micro-edges that are perpendicular to the direction of the braking motion are considered favourable. One approach is to remove the matrix alloy by just a few microns so that the sharp-edged particles protrude slightly out of the matrix. By superimposing an ultrasonic vibration in turning as a second approach, corresponding micro-edges are to be produced directly during finish machining without a subsequent process step. The respective surfaces are characterised in detail by optical and tactile methods as well as the surface layers by means of microstructure resolving methods. The results obtained on a laboratory scale at Chemnitz University of Technology are to be transferred to the industrial partner on the component brake disc and tested there comprehensively according to the test procedures prescribed for the braking system.

在工业化国家中，运输在产生排放中起着重要作用，除了轮胎和制动系统组件燃烧燃料外，这还会导致燃料。迄今为止，相对较少考虑的摩擦学系统是乘用车的制动系统，这极大地促进了对环境的制动灰尘排放。目前，绝大多数汽车都使用了由铸铁制成的制动盘。但是，除了刹车板外，它们还会经历巨大的磨损。颗粒增强的铝基质复合材料（AMC）的应用尤其旨在大大减少制动盘和制动垫的磨损。仍然不可能在机动车中大规模使用这种制动系统，因为一方面，基本的摩擦学关系知之甚少。另一方面，缺少AMC处的功能表面（摩擦表面）的合适整理过程。因此，该项目的主要目标是对由制动盘和制动垫组成的摩擦学系统中的相互作用有更深入的了解。在这种情况下，应考虑由制动盘的特定饰面以及制动盘的预处理产生的表面特性。最后，应理解相关装载方案中发生的磨损机制。这只能通过跨学科的研究方法，将材料和生产工程的工作结合起来来实现。一个重要的研究目标是为在很大程度上无损害和适当的表面生成AMC的AMC创建知识，以作为制动盘摩擦表面。摩擦学研究的重点在于表面特性之间的基本作用机理，预处理（摩擦学膜的受控生产）及其闯入和磨损行为。对于预处理，垂直于制动运动方向的微边被认为是有利的。一种方法是仅需几微米去除基质合金，以便锋利的颗粒从矩阵中稍微突出。通过将超声波振动叠加为第二种方法，将在完成加工过程中直接产生相应的微边，而无需随后的过程步骤。各个表面通过光学和触觉方法以及通过微结构解析方法详细介绍了表面层。在Chemnitz技术大学实验室量表上获得的结果将转移到组件制动盘上的工业合作伙伴，并根据制动系统规定的测试程序进行了全面的测试。