TRIBOLOGICAL CHARACTERISTICS OF SPUTTERED AU/CR FILMS ON ALUMINA SUBSTRATES AT ELEVATED-TEMPERATURES

[摘要] This paper describes research to evaluate the tribological properties of alumina pins sliding against thin sputtered gold films on alumina disk substrates. A chromium interlayer 250 angstrom thick was first deposited on the alumina test disks to enhance the adhesion and high temperature wetting of the gold films. The Au/Cr films were tribotested in pure sliding in a pin-on-disk tribometer under a load of 4.9 N at 1 m s-1. The test atmosphere was room air at temperatures of 25, 500 and 800-degrees-C and the test duration varied from 60 to 540 min. The use of the Au/Cr films reduced the friction by about a factor of 2 compared with the unlubricated alumina sliding couple. The coatings prevented wear of the alumina substrate disks and reduced the pin wear by one to two orders of magnitude. In addition, wear lives in excess of 200 000 sliding passes (9 h) were observed during sliding at 800-degrees-C. The results suggest that these films show promise for the lubrication of many high temperature sliding components.

[发布日期] 1993-12-10

[效力级别]  Proceedings Paper