Growth defects in CrN/NbN coatings deposited by HIPIMS/UBM techniques

Abstract

Table 5.1. Comparison between the properties of the coatings exhibited improved tribological and corrosion performances.

Improvement of Corrosion and Wear Resistance of CoCrNiSi0.3 Medium-Entropy Alloy by Sputtering CrN Film

“…In the cases of 2.5 h- and 3 h-deposited CrN films, the re-arrangement of surface atoms caused by the continuous bombardment of Cr atoms leads to the transformation of the surface growth model from a cellular particle structure to an angular particle structure as a consequence of the competing growth [ 46 , 47 ]. With the increase in CrN film thickness, the competitive growth among the columnar grains and the limited surface atom diffusion result in greater surface undulations [ 48 ]. Therefore, with the increase in deposition time, the average surface roughness of 2 h-, 2.5 h-, and 3 h-deposited CrN films increases from 11.7 nm and 15.5 nm to 17.2 nm, respectively.…”

“…They are stable in corrosive environments and can be retained on the surface of CrN film due to their special characteristics of a simple shape and smooth surface [ 52 ]. It is reported that a thicker CrN film can delay the corrosion solution from corroding through the coating [ 48 ]. Since the 3 h-deposited CrN film has the thickest thickness, the specimen surface in Figure 11 c not only does not form pinholes but also has a few residual nodular defects.…”