Role of wear particles in severe–mild wear transition
Role of wear particles in severe–mild wear transition
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DOI：
10.1016/j.wear.2005.02.102
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发表时间：
2005-07
期刊：
影响因子：
5
通讯作者：
K. Hiratsuka;K. Muramoto
中科院分区：
文献类型：
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作者：
K. Hiratsuka;K. Muramoto
在粘着磨损中，磨损率急剧下降的现象主要表现为磨损的严重-轻微转变。本文旨在阐明磨损模式从严重到轻度转变的机制。在实验室的空气中，一个铜针与旋转的铁盘摩擦。滑动条件，如载荷和滑动速度的变化。为了关注磨损颗粒的作用，它们被空气滤清器去除。为了控制磨粒的行为，改变销盘试验机的设置位置。对严重磨损颗粒和轻度磨损颗粒的内部结构进行了分析。随着磨损模式由严重向轻度转变，磨粒的形貌也发生了变化，磨粒尺寸逐渐减小。但值得注意的是，即使在严重磨损模式下，也会发现一些轻度磨损颗粒，并且在轻度磨损模式的早期阶段也会发现一些严重磨损颗粒。在轻度磨损模式下产生的大的黑色磨粒由核心的严重磨损颗粒组成，核心被细小的黑色轻度磨损颗粒覆盖。当形成小的磨损颗粒时，它们容易被氧化并转化为轻度磨损颗粒。然而，如果将它们从表面移除，则未观察到轻度磨损。轻度磨损颗粒附着在磨损表面形成保护性氧化膜，引起轻度磨损。随着滑动速度的增加，在相对较低的载荷条件下，严重-轻度磨损转变所需的滑动距离成比例地增加。这表明存在着跃迁的特征时间。这是产生足够数量的轻度磨损颗粒并使其附着在表面上的必要时间。
Severe–mild wear transition is one of the most interesting phenomena in adhesive wear, because the wear rate decreases drastically after the transition. This paper is aimed at clarifying the mechanism of wear mode transition from severe to mild. A copper pin was rubbed against rotating iron disk in laboratory air. Sliding conditions such as load and sliding velocity were changed. To focus on the role of wear particles, they were removed by air cleaner. To control the behavior of wear particles, the set position of pin-on-disk tester was changed. The inner structures of severe and mild wear particles were also examined. As the wear mode changed from severe to mild, morphologies of wear particles also changed and resulted in smaller particle sizes. However it is to be noted that some mild wear particles were noticeable even in severe wear mode and that some severe wear particles were also found at the early stage of mild wear mode. Large black wear particles produced in mild wear mode were composed of severe wear particles in the core, which was covered by fine black mild wear particles. When small wear particles are formed they are easily oxidized and transform to mild wear particles. However if they were removed from the surface, mild wear was not observed. The attachment of mild wear particles to the worn surface formed a protective oxide film, and induced mild wear. As the sliding velocity increased, the sliding distance needed for severe–mild wear transition increased proportionally at relatively low load conditions. It indicates the existence of characteristic time for the transition. It is the necessary time for the production of adequate amount of mild wear particles and their attachment on the surface.