Abstract
The friction properties of a sapphire contact in aqueous solution with moderate pressure (1 GPa) are analyzed. The initial friction coefficient is found to be the same in every atmosphere where water is present and equal to 0.2 for a hertzian pressure of 7 × 108 Pa. But, when the wear process takes place, the friction increases and depends on the pile-up of particles in the contact area. We show the existence of a penumbral zone, where some compacted films might be sheared. The area of this zone influences the friction coefficient. Presented at the 35th STLE/ASME Tribology Conference in Fort Lauderdale, Florida October 16–19, 1989
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