A tribochemical evaluation of a WC–DLC coating in EP lubrication conditions
A tribochemical evaluation of a WC–DLC coating in EP lubrication conditions
复制标题
DOI：
10.1016/j.wear.2011.01.071
复制
发表时间：
2011-07
期刊：
影响因子：
5
通讯作者：
K. Mistry;A. Morina;A. Neville
中科院分区：
文献类型：
--
作者：
K. Mistry;A. Morina;A. Neville
提高燃油经济性和部件耐久性以及减少对润滑油中某些有害成分的依赖是汽车工业的关键问题。近年来，已经努力在汽车部件中使用表面工程表面以生产环境友好的车辆以及提高燃料经济性。由于市售润滑剂主要针对铁类材料的有效润滑进行了优化，因此新型材料的有效润滑，特别是在边界润滑/EP区域中的有效润滑还没有得到很好的理解。已发表的研究还表明，润滑剂化学可能对固有涂层性能产生不利影响，改变其机械性能。在边界润滑/EP条件下工作的摩擦学系统依赖于润滑剂-添加剂相互作用来引发表面反应。摩擦学系统的性能（摩擦相关效率和磨损相关可靠性）取决于引发表面反应所需的时间、表面反应的性质以及由于表面反应而形成的膜的稳定性。本文对WC掺杂类金刚石（DLC）涂层在极压（EP）条件下的润滑和磨损机理进行了基础性研究。在目前的工作中，从摩擦化学研究的结果，了解DLC界面的摩擦膜的演变机制与模型油润滑，含有一个典型的抗磨损和腐蚀抑制剂添加剂。性能与磨损性能相关。磨损测量在小的时间间隔沿着进行，同时使用表面敏感技术、XPS（X射线光电子能谱）和拉曼光谱检查摩擦膜的化学性质。据观察，添加剂涂层表面之间的表面反应随时间变化很大，这些反应显着影响摩擦学性能。
Improvement of fuel economy and component durability as well as reduction of dependence on some harmful components of lubricants are the key concerns for automotive industries. In recent years, efforts have been made to use surface engineered surfaces in automotive components to produce environmentally friendly vehicles as well as to increase fuel economy. Since commercially available lubricants are mainly optimised for effective lubrication of ferrous materials, effective lubrication of novel materials, especially in the boundary lubrication/EP regime, is not well understood. Published research has also indicated that lubricant chemistry could have a detrimental impact on the intrinsic coating properties, changing their mechanical properties. Tribological systems working in boundary lubrication/EP conditions rely on lubricant–additive interactions to initiate surface reactions. The performance (friction-related efficiency and wear-dependent reliability) of tribological systems depends on the time taken to initiate surface reactions, the nature of the surface reactions and the stability of the films formed as a result of the surface reactions. This paper is a fundamental study of the lubrication and wear mechanisms of a WC-doped diamond-like-carbon (DLC) coating when lubricated in the extreme pressure (EP) regime. In the present work results from a tribochemistry study to understand the tribofilm evolution mechanisms for a DLC interface lubricated with a model oil containing a typical antiwear and corrosion inhibitor additive are presented. The performance was correlated with the wear performance. The wear measurements were carried out at small time-intervals along with the examination of the chemistry of the tribofilm using surface sensitive techniques; XPS (X-ray photoelectron spectroscopy) and Raman spectroscopy. It was observed that surface reactions between the additive-coating surface varied considerably with time and these reactions significantly influence the tribological performance.