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Correlation between Scratching and Macroscopic Sliding Properties of Polymer/Metal-Pairs based on Mechanism Analysis

基于机理分析的聚合物/金属对划痕与宏观滑动性能的相关性

基本信息

批准号：
250158768
负责人：
Professor Dr. Roland Bennewitz
金额：
--
依托单位：
Leibniz-Institut für Neue Materialien gGmbH (INM)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/250158768?language=en
关键词：
Correlation between Scratching Macroscopic Sliding

项目摘要

Friction and wear of sliding contacts between polymers and metals depend critically on the roughness of the metal counterbody. The interaction of roughness asperities with the polymer surface contributes to friction and leads to ploughing, material transformation, and transfer film formation. The underlying mechanisms are investigated in single-asperity scratching experiments. Our project explores the connection between the mechanisms revealed by microscopic scratching experiments and the results of macroscopic standard tests in tribology. In the first phase of the project, we have established quantitative links between the different length and velocity scales by means of multi-pass scratching, using single micro-asperities crafted from the steel counter body of macroscopic tests. Further successful strategies for linking microscopic phenomena and macroscopic tests included novel high-resolution pin-on-flat experiments and measurements across the glass transition temperature. In the continuation of the project, we propose to extend the approach with three key aspects. We will reveal the influence of internal friction in the polymeric materials, i.e. of the thermo-mechanical bulk properties, on friction and wear. We will clarify the transfer film mechanisms of different polymers at the single asperity level in correlation to the lubricating function of transfer films on rough and smooth areas of the steel surface. Finally, we will address the frictional energy input and temperature in general in relation to the viscoelasticity of worn polymer surfaces and the resulting wear performance. Our project builds on the complementary expertise in the Nanotribology Group of the INM - Leibniz Institute for New Materials, Saarbrücken, and the Chair of Composite Engineering at the University of Kaiserslautern. The successful project will not only contribute to the understanding of key mechanisms in polymer-steel tribology and thus to a rational design of new polymeric tribomaterials, but also establish novel methods in multi-scale tribology which can be applied beyond these systems.

聚合物和金属之间滑动接触的摩擦和磨损主要取决于金属对位体的粗糙度。粗糙度与聚合物表面的相互作用产生摩擦，导致犁耕、材料转化和转移膜的形成。潜在的机制被调查在单粗糙划痕实验。我们的项目探索微观刮擦实验揭示的机制与摩擦学宏观标准测试结果之间的联系。在项目的第一阶段，我们通过多道划痕建立了不同长度和速度尺度之间的定量联系，使用从宏观测试的钢计数器中制作的单个微凹凸不平。将微观现象和宏观测试联系起来的进一步成功策略包括新颖的高分辨率平面引脚实验和跨玻璃化转变温度的测量。在项目继续进行的过程中，我们建议从三个关键方面扩展该方法。我们将揭示聚合物材料的内摩擦，即热-机械体积性能，对摩擦和磨损的影响。我们将阐明不同聚合物的转移膜机制在单一粗糙度水平上与转移膜在钢表面粗糙和光滑区域的润滑功能的关系。最后，我们将讨论摩擦能量输入和温度与磨损聚合物表面的粘弹性和由此产生的磨损性能的关系。我们的项目建立在INM -莱布尼茨新材料研究所纳米摩擦学组的互补专业知识和saarbr<e:1> cken以及凯泽斯劳滕大学复合材料工程主席的基础上。该项目的成功不仅有助于理解聚合物-钢摩擦学的关键机理，从而合理设计新型聚合物摩擦材料，而且还建立了可应用于这些系统之外的多尺度摩擦学的新方法。