In situ friction and wear measurements of ion implanted 304 stainless steel in nitrogen and oxygen ambients
The dual ion implantation of Ti and C (4.6 x 10/sup 17/ Ticm/sup 2/ at 180 keV followed by 2.0 x 10/sup 17/ Ccm/sup 2/ at 50 keV) into 304 stainless steel has been found to reduce friction and wear in vacuum, oxygen and air environments. This treatment produces an amorphous matrix with embedded TiC precipitates within the implanted layer. Unlubricated friction measurements and wear track analyses were completed in situ in a scanning Auger microprobe using a 440C pin at a Hertzian contact stress three times the bulk yield strength of umimplanted 304. In ultrahigh vacuum the friction coefficient was reduced from 1.2 to 0.6 to 0.8, while the wear track width decreased from 414 to 325 ..mu..m at 5000 cycles. For partial pressure of 2.1 x 10/sup -5/ Pa of oxygen, almost the same reductions in friction and wear were obtained as in air: ion implantation decreased the friction coefficient from 1.10 to .65 and the wear track width from 319 to 198 ..mu..m at 5000 cycles, as compared to decreases of 1.0 to 0.5 and 255 to 190 ..mu..m, respectively, in air. Such decreases were not observed in nitrogen ambients, although the results in nitrogen were similar to those in ultrahigh vacuum. Friction coefficients and the analyses of wear track compostions indicate that oxidation fo the implanted layer during sliding is important for reducing friction. 18 refs., 2 figs., 3 tabs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5047187
- Report Number(s):
- SAND-87-2798C; CONF-880488-3; ON: DE88008792
- Resource Relation:
- Conference: 15. international conference on metallurgical coatings, San Diego, CA, USA, 11 Apr 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
STAINLESS STEEL-304
FRICTION
ION IMPLANTATION
WEAR RESISTANCE
CARBON IONS
KEV RANGE
MICROANALYSIS
OXIDATION
TITANIUM CARBIDES
TITANIUM IONS
ALLOYS
CARBIDES
CARBON COMPOUNDS
CHARGED PARTICLES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
ENERGY RANGE
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IONS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
NICKEL ALLOYS
STAINLESS STEELS
STEELS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360106* - Metals & Alloys- Radiation Effects
360103 - Metals & Alloys- Mechanical Properties