1 December 1990 Tribological performance of hard carbon coatings on 440C bearing steel
Author Affiliations +
Abstract
Hard carbon coating such as diamond and diamond-like c :bon (also referred to as amorphous carbon) have received considerable attention for tribological applications due to their high hardness high modulus and desirable surface properties. Unfortunately most of the deposition techniques induce high substrate temperatures that temper traditional bearing steels and reduce the substrate load-carrying capability. Therefore to effectively use these desirable coatings a lower temperature deposition technique is required. Ion beam deposition offers essentially ambient temperature conditions accurate control ofprocess parameters and good coating-substrate adhesion. To use these attributes a test program was initiated to deposit mass analyzed high purity carbon and methane ions onto molybdenum and 440C bearing steel for subsequent characterization by Raman spectroscopy and friction-wear tests. Preliminary results for a coating deposited from a CO source showed an amorphous carbon/microcrystalline graphite structure which exhibited very high microhardness and a 3-fold reduction in coefficient of friction for unlubricated tests compared to untreated 440C steel. In addition incrementally increasing the applied load up to a factor of 5 resulted in progressively lower coefficients of friction only a minor increase (about 11) in the wear scar depth and no dramatic coating delamination or damage. Therefore an amorphous carbon/graphite coating applied to 440C steel at ambient temperature exhibits solid lubricating film characteristics with extremely high load-carrying capability. *Work performed under Martin Marietta Independent Research and Development Project D-8 1R Materials Technology. 116
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Frank N. Kustas, Frank N. Kustas, Mohan S. Misra, Mohan S. Misra, Donald F. Shepard, Donald F. Shepard, Joseph F. Froechtenigt, Joseph F. Froechtenigt, } "Tribological performance of hard carbon coatings on 440C bearing steel", Proc. SPIE 1325, Diamond Optics III, (1 December 1990); doi: 10.1117/12.22475; https://doi.org/10.1117/12.22475
PROCEEDINGS
13 PAGES


SHARE
RELATED CONTENT

Nucleation and growth of diamond by laser ablation
Proceedings of SPIE (September 08 1999)
Investigation on the DLC films prepared by dual ion beam...
Proceedings of SPIE (November 01 1991)
Optical Glass Finishing
Proceedings of SPIE (December 21 1989)
Smooth diamond films by reactive ion-beam polishing
Proceedings of SPIE (December 01 1991)

Back to Top