| タイトル | Au/Cr Sputter Coating for the Protection of Alumina During Sliding at High Temperatures |
| 本文（外部サイト） | http://hdl.handle.net/2060/19950018017 |
| 著者（英） | Benoy, Patricia A.; Dellacorte, Christopher |
| 著者所属（英） | NASA Lewis Research Center |
| 発行日 | 1995-03-01 |
| 言語 | eng |
| 内容記述 | A sputter deposited bilayer coating of gold and chromium was investigated as a potential solid lubricant to protect alumina substrates in applications involving sliding at high temperature. The proposed lubricant was tested in a pin-on-disk tribometer with coated alumina disks sliding against uncoated alumina pins. Three test parameters; temperature, load, and sliding velocity were varied over a wide range in order to determine the performance envelope on the gold/chromium (Au/Cr) solid lubricant film. The tribo-tests were run in an air atmosphere at temperatures of 25 to 1000 C, under loads of 4.9 to 49.0 N and at sliding velocities from 1 to 15 m/sec. Post test analyses included surface profilometry, wear factor determination and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) examination of worn surfaces. Compared to unlubricated Al2O3 sliding, the use of the Au/Cr film reduced friction by 30 to 50 percent and wear by one to two orders of magnitude. Increases in test temperature resulted in lower friction and the Au/Cr film continued to provide low friction, about 0.3, even at 1000 C. Pin wear factors and friction were largely unaffected by increasing loads up to 29.4 N. Sliding velocity had essentially no effect on friction, however, increased velocity reduced coating life (total sliding distance). Based upon these research results, the Au/Cr film is a promising lubricant for moderately loaded, low speed applications operating at temperatures as high as 1000 C. |
| NASA分類 | CHEMISTRY AND MATERIALS (GENERAL) |
| レポートNO | 95N24437
NASA-TM-106853
E-9442
NAS 1.15:106853
DOE/NASA/50306-7 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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