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Effect of Contact Area on Friction and Wear Behavior in Atomic Force Microscope  

Choi Dukhyun (포항공과대학교 기계공학과 대학원)
Hwang Woonbong (포항공과대학교 기계공학과)
Publication Information
Journal of the Korean Society for Precision Engineering / v.21, no.12, 2004 , pp. 167-173 More about this Journal
Abstract
Recently, it has been reported that frictional behavior at nanometer scale can be different from that at macro scale. In this article, friction and wear tests were conducted using an AFM to investigate the effect of real contact area on the coefficient of friction and wear property. SiO$_2$, Hica, and SiGe were used in friction test and the AFM tip was Si$_3$N$_4$. The real contact area between an AFM tip and flat surface was calculated by the Johnson-Kendall-Roberts (JKR) theory. Wear specimen was Mica, and the diamond tip was used. We found that the coefficient of friction is constant below a critical area, but it is degraded over the area. Moreover, it is found that wear depth increased rapidly from a certain load and was degraded as a function of the number of the scanning cycles. Also, the range of scanning velocity used in this study had little effect on the wear depth.
Keywords
Coefficient of friction; Real contact area; Wear depth; Normal force; Number of scanning cycle;
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