Real-time observation of slipping and rolling events in DLC wear nanoparticles
Real-time observation of slipping and rolling events in DLC wear nanoparticles
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DOI：
10.1088/1361-6528/aac45c
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发表时间：
2018-06
期刊：
影响因子：
3.5
通讯作者：
Takaaki Sato;Shinsuke Nabeya;V. Menon;T. Ishida;R. Kometani;H. Fujita
中科院分区：
文献类型：
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作者：
Takaaki Sato;Shinsuke Nabeya;V. Menon;T. Ishida;R. Kometani;H. Fujita
在纳米尺度上实时观察表面界面之间的实际接触面积可以更精确地检查摩擦过程中发生的情况。我们将微机电系统执行器和透射电子显微镜 (TEM) 观察相结合，在纳米级结点和接触点上施加和测量力。这种定制设计的实验系统可以从横向角度测量接触部位的真实表面积，同时测量摩擦力。我们刮擦了涂有类金刚石碳（一种经典固体润滑剂）的表面，并观察到在界面之间滑动和滚动的磨损颗粒的形成。 TEM 图像显示，当受到低至几十纳米牛顿的力作用时，纳米级表面的形状会发生永久变形。结果证明了依赖于摩擦力测量而没有实时表面轮廓的摩擦分析的局限性。
Real-time observation of the actual contact area between surface interfaces at the nanoscale enables more precise examination of what happens during friction. We have combined micro electro mechanical system actuators and transmission electron microscopy (TEM) observation, to both apply and measure forces across nanoscale junctions and contacts. This custom-designed experimental system can measure the true surface area of a contact site from a lateral viewpoint, while simultaneously measuring the friction force. We scratched surfaces coated with diamond like carbon, a classical solid lubricant, and observed the formation of wear particles that slipped and rolled between the interface. TEM images showed that the shape of the surface at the nanoscale underwent permanent deformation when acted upon with forces as low as several tens of nano newtons. The results demonstrated the limitations of friction analyses relying on friction force measurements without real-time surface profiling.