Micro-friction of Graphite
Micro-friction of Graphite
复制标题
DOI：
10.1038/physci232195a0
复制
发表时间：
1971-08
期刊：
影响因子：
64.8
通讯作者：
J. Skinner;N. Gane;D. Tabor
中科院分区：
文献类型：
--
作者：
J. Skinner;N. Gane;D. Tabor
具有层状结构的固体长期以来一直是摩擦学研究中感兴趣的材料。一般来说，它们具有较低的摩擦系数，经常被用作干润滑膜。我们最近研究了石墨在非常小的载荷(∼1到400 mg)下的摩擦。这些实验是在扫描电子显微镜中进行的，这样就可以在滑动过程中观察到表面变形(分辨率约为500？)。通过这种方式，可以直接研究在基面和边缘平面上滑动行为的显著差异。滑块一般是钨触针，尖端半径约为1微米，并通过精密的振镜机芯加载到另一个平坦的表面上。(Gane 1描述了一种用于显微硬度研究的类似装置。)平面样品可以在指示笔下横穿，从而使指示笔保持在显微镜的视场内。试件台架在刚性双弹簧上，摩擦力通过差动电容装置测量弹簧的挠度来确定。摩擦测量灵敏度为0.0 5 mg，滑动速度为0.7µm S−1。
SOLIDS with a layer-like structure have long been materials of interest in frictional studies. In general they are found to possess a low coefficient of friction and have often been used as dry lubricant films. We have recently studied the friction of graphite at very small loads (∼ 1 to 400 mg). The experiments were carried out in a scanning electron microscope so that surface deformation (to a resolution of about 500 Å) could be observed as it occurred during sliding. In this way it was possible to study directly the marked difference in sliding behaviour for sliding on the basal and on the edge planes. The slider was generally a tungsten stylus, tip radius about 1 µm, and was loaded on to the other, flat, surface using a delicate galvanometer movement. (A similar device used in micro-hardness studies has been described by Gane1.) The flat specimen could be traversed under the stylus thus keeping the stylus within the field of view of the microscope. The specimen stage was carried on a stiff double spring and the frictional force was determined by measuring, with a differential capacitance device, the deflexion of the spring. The sensitivity of the friction measurements was 0.05 mg and the sliding speed was 0.7 µm s−1.