The running-in mechanisms of binary brass studied by in-situ topography measurements
The running-in mechanisms of binary brass studied by in-situ topography measurements
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DOI：
10.1016/j.wear.2013.03.047
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发表时间：
2013-06
期刊：
影响因子：
5
通讯作者：
Tim Feser;P. Stoyanov;Felix Mohr;M. Dienwiebel
中科院分区：
文献类型：
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作者：
Tim Feser;P. Stoyanov;Felix Mohr;M. Dienwiebel
在这项研究中，我们研究了黄铜（即95%的铜和5%的锌）与100Cr 6在润滑条件下的磨合行为。在摩擦学测试之前，使用微压痕、纳米压痕、聚焦离子束分析（FIB）、X射线光电子能谱（XPS）和白色光干涉测量（WLI）来表征材料，以量化机械性能、粒度、化学和形貌。采用“真实的时间”摩擦学方法，在不同的接触压力（1- 4 MPa）和滑动速度（10- 20 mm/s）下，用销-板摩擦磨损试验机进行了滑动试验。我们发现，在磨合过程中，摩擦的显着减少只发生在一个小范围内的压力（2.4-2.9MPa）。我们认为，两个主要机制是有利于磨合。第一种机制是在磨损痕迹的近表面区域中存在ZnO，其充当润滑剂并减少摩擦。第二种机制是在引脚的前200 nm内存在C/CHX，其充当钝化层，从而保持转移膜薄且稳定。
In this study, we investigate the running-in behavior of brass (i.e. 95% Copper and 5% Zinc) sliding against 100Cr6 under lubricated conditions. Prior to the tribological tests, the materials are characterized using microindention, nanoindentation, Focused Ion Beam analysis (FIB), X-Ray Photoelectron Spectroscopy (XPS), and White Light Interferometry (WLI) in order to quantify the mechanical properties, grain sizes, chemistry, and topography. The sliding experiments are performed using “real time” tribometry with a pin on plate tribometer with varying contact pressures (1–4MPa) and sliding velocities (10–20mm/s). We found that a significant reduction in friction during running-in occurs only at a small range of pressure (2.4–2.9MPa). We suggest that two main mechanisms are favorable for running-in. The first mechanism is the presence of ZnO in the near-surface region of the wear track, which acts as lubrication and reduces the friction. The second mechanism is the presence of C/CHXwithin the first 200nm of the pin which acts as a passivation layer and thus keeps the transfer film thin and stable.