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首页> 外文会议>World Tribology Congress III vol.1; 20050912-16; Washington,DC(US) >MODELS OF FRICTION AND WEAR OF DLC FILMS
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MODELS OF FRICTION AND WEAR OF DLC FILMS

机译：DLC膜的摩擦模型和磨损

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Wear and friction of DLC (diamond-like carbon) covered counterparts are under consideration. Experiments showed that abrasion is the leading wear mechanism at the beginning of the wear process. However, the ability of the surface to wear away the counterpart reduces very rapidly, often as a power law function of the cycle numbers. This phenomenon was explained assuming that the initial abrasiveness of a coating is determined by the number of the nano-sharp asperities that were in contact with the counterpart, i.e. by the number of the sharp asperities within the nominal region of contact. On this basis, a model of abrasive wear was developed, using the concept of statistical self-similarity of distribution of the nano-sharp asperities within the current contact region. After the sharp asperities were blunted or removed from the contact region, the wear is related either to phase transformations or to chemical mechanisms. Recent experimental studies of dry sliding between two hydrogenated DLC coated counterparts in low oxygen environment showed that adsorbates have considerable influence on friction and the friction coefficient increases with the increasing of the time interval between contacts. The observed friction phenomena are assumed caused by a reaction between the adsorbate and carbon atoms of the coatings, and when the slider passes a point on the track, it removes mechanically some adsorbate from the surface. The mechanical action leads to re-exposure of the surface to gases in the environment. We assume that there is a transient short-life high temperature field at the vicinities of contacting protuberances that may cause various transformations of the surface. We suppose that first an adsorbate molecule becomes physically adsorbed to the surface and then chemisorbtion may occur between the carbon atoms of the coating and the 'sticky' oxygen atoms. The atoms or molecules of adsorbate interact with the conterpart. Our modeling established a direct connection between this kind of molecular friction and gradual wear. Using the new adsorption-desorption model, the numerical analyses of the friction coefficient were compared with experimental DLC friction results.
机译：正在考虑覆盖DLC（类金刚石碳）的对应物的磨损和摩擦。实验表明，磨损是磨损过程开始时的主要磨损机制。然而，表面磨损对应物的能力非常迅速地降低，这通常是循环次数的幂律函数。假定涂层的初始磨蚀性是由与对应物接触的纳米尖锐粗糙体的数量，即由名义接触区域内尖锐粗糙体的数量确定的，来解释这种现象。在此基础上，利用当前接触区域内纳米锐度凹凸的统计自相似性概念，开发了一种磨料磨损模型。在尖锐的粗糙表面钝化或从接触区域去除后，磨损与相变或化学机理有关。最近在低氧环境下，两个氢化的DLC涂层对应物之间进行干式滑动的实验研究表明，吸附物对摩擦有很大影响，并且摩擦系数随着接触时间间隔的增加而增加。假定观察到的摩擦现象是由涂层的吸附物和碳原子之间的反应引起的，并且当滑块经过轨道上的一点时，它将机械地从表面去除一些吸附物。机械作用导致表面再次暴露于环境中的气体。我们假设在接触隆起附近存在一个短暂的短寿命高温场，该隆起可能引起表面的各种转变。我们假设首先被吸附物分子物理吸附到表面，然后在涂层的碳原子和“粘性”氧原子之间发生化学吸附。被吸附物的原子或分子与竞争分子相互作用。我们的模型建立了这种分子摩擦与渐进磨损之间的直接联系。使用新的吸附-解吸模型，将摩擦系数的数值分析与实验DLC摩擦结果进行了比较。

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