Ion-beam-assisted deposition of wear-resistant coatings
Both titanium nitride and chromium oxide coatings have been fabricated by ion-beam-assisted deposition, which involved the electron-beam evaporation of Ti or Cr and simultaneous bombardment with low-energy argon ions. Either nitrogen or oxygen gas was introduced into the deposition system to at 1 to 8 [times] 10[sup [minus]3] Pa to form the compound. Monitoring of the individual fluxes of vapor atoms, ions, and gas molecules incident on steel or Si substrates permitted control of deposition parameters, with the most critical one being ratio of incident argon ions to vapor atoms, R[sub ia]. For both types of films, the hardness increased with this ratio. In scratch and sliding wear tests, both types of films demonstrated excellent adhesion to the substrates. For the TiN films, optimum wear resistance was obtained for R[sub ia] = 0. 3 with a friction coefficient of 0.35 at Hertzian contact pressures in the range of 1 GPa. For the Cr[sub 2]O[sub 3] films, optimum wear resistance was obtained for R[sub ia] = 0.1. At room temperature, no wear was observed for Si[sub 3]N[sub 4] balls sliding on the coatings at contact pressures up to 1 GPa. At temperatures up to 500C, virtually no wear was observed for sapphire balls sliding on the coatings at similar contact pressures.
- Research Organization:
- Naval Research Lab., Washington, DC (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AI02-88CE90024
- OSTI ID:
- 6688333
- Report Number(s):
- DOE/CE/90024-14; ON: DE93011120
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
CHROMIUM OXIDES
DEPOSITION
WEAR RESISTANCE
TITANIUM NITRIDES
ADHESION
FRICTION
HARDNESS
ION BEAMS
MICROSTRUCTURE
PROGRESS REPORT
PROTECTIVE COATINGS
SILICON NITRIDES
STEELS
TRANSMISSION ELECTRON MICROSCOPY
TRIBOLOGY
ALLOYS
BEAMS
CHALCOGENIDES
CHROMIUM COMPOUNDS
COATINGS
CRYSTAL STRUCTURE
DOCUMENT TYPES
ELECTRON MICROSCOPY
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
MICROSCOPY
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
SILICON COMPOUNDS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
070205* - Radiation Sources- Industrial Applications
Radiation Processing- (1987-)
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties