Abstract
Silver solid lubricant films with a thin titanium interlayer for enhanced adhesion, were sputter deposited on Al 2O 3 substrate disks to reduce friction and wear. The dual Ag/Ti films were tested at room temperature in a pin-on-disk tribometer sliding against bare, uncoated Al 2O 3 pins under a load of 4.9 N at a sliding velocity of 1 m s -1. The Ag/Ti films reduced the friction coefficient by 50% to about 0.42 compared to unlubricated baseline specimens. Pin wear was reduced by a factor of 140 and disk wear was reduced by a factor of 2.5 compared to the baseline. These films retain their good tribological properties, including adhesion, after heat treatment in argon at 850°C and thus may be able to lubricate over a wide temperature range. This lubrication technique is applicable to space lubrication, advanced heat engines and advanced transportation systems.
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