Wear-resistant, self-lubricating surfaces on diamond coatings
- National Aeronautics and Space Administration, Cleveland, OH (United States)
In humid air and dry nitrogen, as-deposited, fine-grain diamond films and polished, coarse-grain diamond films have low steady-state coefficients of friction (<0.1) and low wear rates (<10{sup {minus}6}mm{sup 3}/N{sm_bullet}m). In an ultrahigh vacuum (10{sup {minus}7}Pa), however, they have high steady-state coefficients of friction (>0.6) and high wear rates (>10{sup {minus}4} mm{sup 3}/N{sm_bullet}m). Therefore, the use of as-deposited, fine-grain and polished, coarse-grain diamond films as wear-resistant, self-lubricating coatings must be limited to normal air or gaseous environments such as dry nitrogen. On the other hand, carbon-ion-implanted, fine-grain diamond films and nitrogen-ion-implanted, coarse-grain diamond films have low steady-state coefficients of friction (<0.1) and low wear rates (<10{sup {minus}6} mm{sup 3}/N{sm_bullet}m) in all three environments. These films can be effectively used as wear-resistant, self-lubricating coatings in an ultrahigh vacuum as well as in normal air and dry nitrogen.
- OSTI ID:
- 230102
- Report Number(s):
- CONF-950840--
- Country of Publication:
- United States
- Language:
- English
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