Dynamical Evolution of Wear Particles in Nanocontacts
Dynamical Evolution of Wear Particles in Nanocontacts
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DOI：
10.1007/s11249-011-9886-3
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发表时间：
2012-02-01
影响因子：
3.2
通讯作者：
Bobji, M. S.
中科院分区：
文献类型：
--
作者：
Anantheshwara, K.;Lockwood, A. J.;Bobji, M. S.
通过滑动表面和可移动纳米颗粒的相互作用，纳米级表面改性是控制表面结构摩擦、磨损和破坏的关键参数。在这里，我们展示了纳米颗粒是如何在移动的纳米接触中形成和实时相互作用的，在透射电子显微镜下，在纳米尺度上进行了往复磨损测试，在bb0 300次循环中进行了原位成像。在滑动表面之间，可以观察到摩擦形成的纳米颗粒的滚动、滑动和旋转运动，这取决于局部接触条件和颗粒几何形状。经过多次划痕循环，纳米颗粒动态地聚集成细长的团簇，并解离成更小的颗粒。我们还表明，这些粒子的滚动运动的开始伴随着测量摩擦的减少。因此，引入具有最佳形状和性能的纳米颗粒可用于控制微器件中的摩擦和磨损。
Nanoscale surface modification, by the interaction of sliding surfaces and mobile nanoparticles, is a critical parameter for controlling friction, wear and failure of surface structures. Here we demonstrate how nanoparticles form and interact in real-time at moving nanocontacts, with reciprocating wear tests imaged in situ at the nanoscale over > 300 cycles in a transmission electron microscope. Between sliding surfaces, friction-formed nanoparticles are observed with rolling, sliding and spinning motions, dependant on localised contact conditions and particle geometry. Over periods of many scratch cycles, nanoparticles dynamically agglomerate into elongated clusters, and dissociate into smaller particulates. We also show that the onset of rolling motion of these particles accompanies a reduction in measured friction. Introduction of nanoparticles with optimum shape and property can thus be used to control friction and wear in microdevices.