A Fundamental Study on Nanotribology

采用扫描隧道显微镜（STM）和原子力显微镜（AFM）对其进行了纳米摩擦学研究。本研究的目的是在纳米尺度上建立尚未被任何人研究的摩擦学基础。在这两年的研究中，获得了以下关于接触界面处材料微附着力和微变形的有趣结果。(1)微观粘附力接触界面之间的相互作用力所产生的力，如吸引力和排斥力，是摩擦时产生的粘附力。当我们考虑纳米尺度接触界面的摩擦力时，这种附着力将是非常重要的。因此，为了分析黏附力的产生机理，采用STM和AFM对黏附力进行了测量，从理论上解释了黏附力的产生机理。(2)微变形当我们考虑纳米尺度的磨损和加工时，原子层面的微变形将是非常重要的。因此，为了分析其变形机理，采用一种新的方法：将金刚石STM探针尖端直接压痕在金表面，测量其微塑性变形。结果表明，纳米尺度的微变形行为可以应用于一般材料动力学。

The reserach of Nanotribology was carried out by using STM(Scanning tunneling microscope)and AFM(Atomic Force Microscope). The purpose of this investigation is to establish the fundamentals of tribology in nanometer scale which have not been studied by anyone. From this investigation during these two years, the following interesting results with respect to micro adhesion force and micro deformation of materials at the contact interface were obtained.(1)Micro Adhesion ForceThe force which is caused by interaction force between contact interface such as attractive and repulsive force are adhesion force occurred with friction. When we think about friction force at the contact interface in nanometer scale, this adhesion force will be very important. Therefore, in order to analyze the mechanism of adhesion-force, adhesive force was measured by STM and AFM, as the result, the mechanism of adhesion force could be explained theoretically.(2)Micro DeformationWhen we think about wear and machining in nanometer scale, micro deformation in atomic revel will be very important. Therefore, in order to analyze the deformation mechanism, micro plastic deformation was measured by using new method : a diamond STM probe tip was indented on the gold surface directly. As the result, it became clear that the behavior of micro deformation in nanometer scale could be applied general material dynamics.