Sliding Wear Behavior of PVD CrN and TiN Coated Austempered Ductile Iron

Abstract

This work studies the sliding wear behavior of PVD coated austempered ductile iron 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. 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). The steady-state friction coefficient and 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. 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 specific wear rate of the pins (AISI 52100 bearing balls) 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.

Wear and Corrosion Resistance of CrN Films on Oxynitriding-treated Vanadis 8 Tool Steel <i>via</i> the DC Magnetron Sputtering Process

“…Among them, DC magnetron sputtering has been frequently used to grow high quality films. [13][14][15][16] And this coating production can be developed at low deposition temperature that is the most important advantage of this material. 17,18) The DC magnetron sputtering of PVD technique is widely used due to its high deposition rate, ease of scaling, and the overall quality of the films.…”

Sliding friction and wear behaviour of ion nitrided and TiN coated AISI 4140 steel

“…The second set of variables was selected in order to evaluate the wear resistance. In this case, the variables were: F N = 10 N, p 0 = 1.4 GPa, L = 2700 m and v = 0.3 m/s, allowing to compare these results with previous works [19]. For each group of processed discs, eight tests were conducted at low load and three tests at high load conditions.…”

“…In order to evaluate the response of different surface treatments, most sliding wear tests have imposed significant damage to the material surface [16][17][18][19][20][21][22][23]. This may be advantageous to magnify the differences in wear resistance between the materials being evaluated, to accelerate tests, etc., but the use of high normal loads and long sliding distances, makes the tribosystem to experiment substantial changes during the test [24].…”

Cr-Based Sputtered Decorative Coatings for Automotive Industry

“…The test duration was limited to 1 min, resulting in a total sliding distance of 1.21 m. For assessing the wear rate, an Alicona 3D optical profilometer was used was used. The specific wear rates ( K i ) were obtained using Equation (1), where ∆ V i is wear volume, F N is the normal load, and L the sliding distance [ 21 , 22 ]: …”