Evaluation of crack resistance of CrSiCN coatings as a function of Si concentration via nanoindentation

Fracture toughness and sliding properties of magnetron sputtered CrBC and CrBCN coatings

“…It was also pointed out that resistance to radial crack was proportional to H/E. Similar results were also reported in our previous works on CrSiCN (H/E > 0.06) and CrTiAlN coatings (H/E = 0.068)[29,44,51]. Consequently, CrBC-H is expected to be the toughest coating according to the H/E ratios reported in…”

Comparison of crack resistance between ternary CrSiC and quaternary CrSiCN coatings via nanoindentation

“…After the height (h) and width (2a) of each contour were measured, individual compressive stress (s) of coatings could be calculated by Stoney's equation, which has been described in Ref. [38]. CrSiCN (10) CrSiC (10) CrSiCN (30) CrSiCN (20) CrSiC (30) CrSiC (20) CrN (200) …”

“…Thus, the reason to the higher H/E and H 3 /E 2 of CrSiCN coatings is the presence of SiN x that lowers the elastic modulus. With regard to the compressive stress (s o0), the Si in CrSiCN and CrSiC coatings presents the same effect that the compressive stress is released by more Si addition due to the more formation of amorphous SiC x and SiN x [15,38].…”

“…But after unloading, the balance of initial compressive stress along the impression edge was broken, the compressive stress stretched the coating towards the impression center. Thus, the CrSiCN(10) coatings with less compactness is easy to be peeled off [38]. Another difference is that there is no radial crack, but pile-up forms on the impression of CrSiC(10) coating.…”

Mechanical and anti-wear properties of multi-module Cr/CrN coatings

“…However, the coating B, in which the largest share is hard layers (CrN), is characterised by the smallest value of this parameter, coating of B type is also characterised by the largest H/E, H 3 /E 2 ratios and value of W e (elastic recovery) indicator. The higher value of these indicators means higher resistance to a fracture toughness and higher resistance to plastic deformation of the coating (Leyland and Matthews, 2000;Musil et al, 2012aMusil et al, , 2012bWang et al, 2015Wang et al, , 2016Wang et al, , 2017aWang et al, , 2017bWang et al, , 2018, what may indicate a greater ability of the coating to carry higher mechanical loads. In turn, coating A is characterised by the lowest values of these indicators, i.e., according to the above interpretation, this coating has the highest susceptibility to plastic deformation.…”