COLL 63 |
| Z. Charles Ying, National Institute of Standards and Technology, Building 223, MS 8520, 100 Bureau Drive, Gaithersburg, MD 20899-8520 and Stephen Hsu, Ceramics, National Institute of Standards and Technology, Room A-265 Building 223, Gaithersburg, MD 20899. |
| As one material plows into another during lateral motion, friction force increases in order to overcome the additional resistance. Using single-asperity probe tips of different radii from 500 nanometers to 10 micrometers, we have investigated plowing threshold and energy balance during plowing. It has been observed that the plowing at silicon substrate begins at a contact pressure of 6 GPa, independent of the probe-tip radius. Below the 6-GPa threshold the friction force exhibits a linear relation with the normal force, and there is no permanent mark observable on the silicon surface using AFM. Above 6 GPa, the friction force is greatly enhanced and scratch marks appears on the surface. The threshold pressure is related to the phase transition of silicon substrate. |
|
Friction, Lubrication, and Adhesion in Micro- and Nano-Scale Devices
2:00 PM-5:00 PM, Sunday, March 28, 2004 Marriott -- Orange County 5, Oral
Division of Colloid and Surface Chemistry |