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Micro-tribological study of metal surfaces using scanning probe microscope

使用扫描探针显微镜对金属表面进行微观摩擦学研究

基本信息

批准号：
08650856
负责人：
SUMOMOGI Tsunetaka
金额：
$ 1.34万
依托单位：
Hiroshima-Denki Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

Micro-tribological studies are made using a scanning probe microscope (SPM) which can measure the lateral force as well as the normal force images. The SPM is placed in an atmosphere control apparatus and the relative humidity around the tip-sample is controlled from 30% to 70%. Measurements are also performed in a high purity water bath. Samples investigated are the cleaved surfaces of mica, HOPG and MoS_2, and the polished metal surfaces of Ni, Cu and Al. In order to discuss the micro-tribological effects of adsorbed water molecules and the capillary condensation of water, the lateral force images are examined quantitatively as a function of the normal load on the sample surface. For surfaces of mica, HOPG and MoS_2, lateral force images with the lattice periodicity are obtained in the same manner as atomic scale topography images. The dependence of lateral force magnitude on the normal force is found to be affected by the atmosphere around the tip and the sample. At low relative humidity, 30%, the lateral force magnitude in atomic scale imaging is almost independent of the normal load. At high relative humidity, 70%, the lateral force magnitude exhibits dependence on the normal load. In water, the lateral force magnitude is approximately in proportion to the normal load. For surfaces of metal almost same behavior is obtained in the average value of lateral force. We conclude that the adhesive force due to the presence of water has severe influence upon the lateral force. From discussion on the viewpoints of Hertz analysis, Elasto-Hydrodynamic Lubrication and capillary condensation of water, the contact mechanism of the tip-sample is revealed.

微观摩擦学研究是使用扫描探针显微镜 (SPM) 进行的，它可以测量横向力以及法向力图像。 SPM 放置在气氛控制装置中，尖端样品周围的相对湿度控制在 30% 至 70% 之间。测量也在高纯度水浴中进行。研究的样品是云母、HOPG和MoS_2的劈裂表面，以及Ni、Cu和Al的抛光金属表面。为了讨论吸附水分子和水的毛细管冷凝的微观摩擦学效应，定量检查侧向力图像作为样品表面法向载荷的函数。对于云母、HOPG和MoS_2的表面，以与原子尺度形貌图像相同的方式获得具有晶格周期性的侧向力图像。发现侧向力大小对法向力的依赖性受到尖端和样品周围气氛的影响。在相对湿度较低（30%）的情况下，原子尺度成像中的横向力大小几乎与法向载荷无关。在高相对湿度（70%）下，侧向力大小表现出对法向载荷的依赖性。在水中，侧向力的大小大约与法向载荷成正比。对于金属表面，在侧向力的平均值中获得几乎相同的行为。我们得出的结论是，由于水的存在而产生的粘合力对侧向力有严重影响。从赫兹分析、弹性流体动力润滑和水的毛细管凝结的角度进行讨论，揭示了尖端与样品的接触机理。