Novel Surface Treatment for Alloy Steel Components
(Room Room 104-B)
29 Apr 19
10:00 AM
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10:20 AM
Tracks:
Protective, Tribological and Decorative Coatings
In this study, magnetron sputtering was employed in the development of a boron-doped diamond-like carbon (DLC) coating that has the high hardness of B4C and the low friction of DLC. Compositional, microstructural, and mechanical properties of the coatings were measured. Some of the AISI 52100 specimens were treated with an ultrasonic nanocrystalline surface modification (UNSM) process prior to coating deposition. The UNSM pretreatment was found to significantly increase the adhesion between the B-doped DLC coating and the substrate. Specimens were evaluated tribologically in sliding, rolling, and mixed mode contact. The lowest wear rates and friction coefficients were obtained in a coating with a B/C ratio ~1%, however the coating suffered from facture-type wear when subjected to high cycle contact stresses. UNSM pretreatment of the AISI 52100 substrate was found to significantly enhance the durability of the B-doped DLC in the sliding, rolling, and mixed mode tribological tests.