Estudio del comportamiento al desgaste por deslizamiento de ADI recubierta con CrN y TiN mediante PVD

D. COLOMBO; M. ECHEVERRÍA; R. DOMMARCO; S. LAINO; J. MASSONE

Santa Fe

Congreso; Congreso SAM-CONAMET-IBEROMAT; 2014

SAM

This work studies the sliding wear behavior of PVD coated ADI samples. The effects of the substrate surface finishing method (grinding and polishing) and coating material (CrN and TiN) on the wear behavior are evaluated. Coatings were applied in an industrial reactor using sets of processing parameters specifically designed for ADI. Deposition times were adjusted to obtain similar film thicknesses in both coating materials. Wear tests under dry sliding conditions were carried out with a pin?on?disc tribometer (ASTM G99), using 6 mm AISI 52100 bearing balls as pins. The steady?state friction coefficient and specific wear rate were calculated for each sample variant. The wear track of the discs was examined by using optical microscopy and stylus profilometry. The results obtained indicate that the uncoated and TiN coated samples show steady?state friction coefficients close to 0.8, while the CrN coated samples show steady?state values close to 0.4, for the different surface finishing methods analyzed. The sliding wear tests do not produce the fracture and/or delamination of the films in any case. The specific wear rate of the CrN and TiN coated samples is close to zero, while that of the uncoated samples is higher. The wear rate of the uncoated samples is slightly higher for the ground ones. The wear rate of the pins is higher than that of the discs in all the cases. The wear rate of the pins tested against uncoated samples is higher for the ground ones. The wear rate of the pins tested against coated samples is higher for the polished and TiN coated ones.