期刊
TRIBOLOGY INTERNATIONAL
卷 40, 期 2, 页码 154-159出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2005.09.006
关键词
friction measurement; hydrodynamic lubrication; hydrophobic coating
资金
- Engineering and Physical Sciences Research Council [GR/S53466/01] Funding Source: researchfish
A novel tribometer capable of measuring low friction forces and low loads at high speeds has been employed to measure the friction coefficient in a pure sliding, ball-on-flat contact in hydrodynamic lubrication conditions. The tribometer was custom-built for measuring friction at low loads, to allow the authors to investigate the feasibility of using the liquid-slip phenomenon for the lubrication of high-sliding MEMS. The theory behind lubrication with liquid slip and its effect on friction is briefly discussed. Contacting surfaces were treated to create hydrophobic/hydrophilic or hydrophilic/hydrophilic pairs. Hydrophobic surfaces were made by coating mica with a self-assembled silane monolayer while the hydrophilic surfaces used were freshly cleaved mica and plasma-cleaned steel. Experiments were conducted at sliding speeds of up to 2m/s and loads below 0.2N. An aqueous glycerol solution was used as lubricant. Results obtained with hydrophilic/hydrophilic surfaces were in accord with hydrodynamic lubrication theory. Tests with hydrophobic/ hydrophilic surfaces revealed a reduction in friction, which may be attributed to lubricant slip against the hydrophobic surface. (c) 2006 Elsevier Ltd. All rights reserved.
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