Particle induced surface erosion - Tumbling and direct impact; a high-speed electrochemical, acoustic and visual study
Particle induced surface erosion - Tumbling and direct impact; a high-speed electrochemical, acoustic and visual study
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DOI：
10.1016/j.wear.2019.02.011
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发表时间：
2019-06-15
期刊：
影响因子：
5
通讯作者：
Barber, Jennifer L.
中科院分区：
文献类型：
--
作者：
Birkin, Peter R.;Barber, Jennifer L.
本文报道了一种利用浸没射流监测直径为250微米、S分辨率为2微米的铝电极在沙粒冲击固/液界面时的阻抗随时间变化的技术。演示了在记录任何冲刷/腐蚀之前，当单个颗粒接近电极时对其进行检测。这项研究表明，至少有两种侵蚀机制是可能的：直接或“主要”撞击和翻滚或“刮擦”事件。初级撞击事件与来自环境的声发射相关，这被证明对这些事件是重要的，而刮擦事件在所采用的条件下似乎产生了弱得多的声发射特征。据报道，在喷口，颗粒的速度约为6-8m S(-1)。然而，粒子撞击基板时的高速成像表明，撞击前的速度显著减速，动能与离开喷气时相比减少了一个数量级。
A technique that monitors the impedance of a 250 mu m diameter aluminium electrode as a function of time with a 2 mu s resolution as sand particles (`slurry erosion') are impinged on the solid/liquid interface is reported using a submerged jet. The detection of individual particles as they approach an electrode, before any erosion/corrosion was registered, is demonstrated. This study shows that at least two types of erosion mechanisms are possible; direct or 'primary' impact and tumbling or 'scrape' events. The primary impact events are correlated to the acoustic emission from the environment which is shown to be significant for these events, whereas scrape events appear to produce far weaker acoustic emission signatures under the conditions employed. The velocities of the particles are reported and are of the order of 6-8 m s(-1) at the jet mouth. However, high-speed imaging of the particles as they strike the substrate indicates a significant deceleration prior to impact and an order of magnitude reduction in kinetic energy compared to that as they exit the jet.