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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 19990914-17; Leeds(GB) >Key governing factors for the tribochemical changes in the interface films
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Key governing factors for the tribochemical changes in the interface films

机译：界面膜摩擦化学变化的关键控制因素

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摘要

Tribochemical reactions between ceramics and metals under various sliding or fretting conditions have been reported many times to critically determine the wear and friction behaviour. Although their strong dependence on environmental and operating conditions was confirmed, details of the mechanisms and chemical reactions are still not fully understood. In particular, different and contradictory assessments of the importance of thermal and mechanical effects on the tribochemical reactions have been reported in literature. In our comprehensive study of fretting wear between steel and silicon nitride ceramics tribochemical reactions were determined to play the critical role under both, dry and oil-lubricated conditions. By using SEM, EDS, AES and TEM analysis, severe oxidation of ceramics and steel, thermal cracking of oil and extreme carbonisation of steel resulting in the carbon content at the tribological interface as high as 10 wt. %, were confirmed under selected conditions. As a consequence, the new properties of the changed tribological interfaces were much different than the original and govern the wear and friction behaviour. In this paper various possible effects on resulting tribological interfaces are discussed based on the experimental evidences of microstructure changes, phase transformations, various thermodynamic and flash temperature calculations and interaction couple experiments in which chemical wear was isolated by controlled mechanical and thermal parameters. It is shown that extremely high temperatures must be considered as a key governing factor in tribochemical reactions, even under conditions, which are usually considered as a low speed-low temperature conditions. Furthermore, discrepancies between the macro-scale evidences including the most advanced contact temperature measurement techniques and the micro-scale changes of the tribological interfaces are explained.
机译：陶瓷和金属在各种滑动或微动条件下的摩擦化学反应已被多次报道，以严格地确定磨损和摩擦性能。尽管证实了它们对环境和操作条件的强烈依赖性，但其机理和化学反应的细节仍未完全理解。特别地，文献中已经报道了对摩擦化学反应的热和机械效应的重要性的不同且矛盾的评估。在我们对钢与氮化硅陶瓷之间的微动磨损的全面研究中，摩擦化学反应被确定在干燥和油润滑条件下都起着至关重要的作用。通过使用SEM，EDS，AES和TEM分析，陶瓷和钢的严重氧化，油的热裂化和钢的极度碳化，导致摩擦界面处的碳含量高达10 wt。 ％，在选定条件下确定。结果，已改变的摩擦学界面的新特性与原始界面大不相同，并且决定了磨损和摩擦行为。在本文中，基于微观结构变化，相变，各种热力学和闪变温度计算以及相互作用耦合实验的实验证据，讨论了对所得摩擦学界面的各种可能影响，在这些实验中，通过受控的机械和热参数隔离了化学磨损。结果表明，即使在通常被认为是低速-低温条件的条件下，极高的温度也必须被视为摩擦化学反应中的关键控制因素。此外，解释了包括最先进的接触温度测量技术在内的宏观尺度证据与摩擦学界面的微观尺度变化之间的差异。

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