OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 24 No. 1 2022 a b c d e f Fig. 1. Surface images of samples coated with: CrN (a), ZrN (b), ZrCrN-1 (c), ZrCrN-2 (d), ZrCrN-3 (e), ZrCrN-4 (f) ZrCrN coatings demonstrate a signifi cant increase in the dale void volume (Vvv increases by a factor of 2.25–3.75 compared with CrN coating and 1.13–1.88 compared with ZrN) and the core void volume (Vvc increases by a factor of 1.34–1.49 compared with CrN coating and 1.12–1.24 compared with ZrN). The peak and core material volumes also increase greatly for ZrCrN coatings (Vmp increases by a factor of 2.88–5.25 compared with CrN coating and 1.77–3.23 compared with ZrN; Vmc increases by a factor of 1.31–1.38 compared with CrN coating and 1.21– 1.29 compared with ZrN). The increase in the dale void volume (Vvv) and peak material volume (Vmp) indicates that ZrCrN coatings contain a larger number of peaks and valleys per unit area compared with CrN and ZrN coatings. This quantitatively agrees with the roughness measurement results. However, the obtained estimates show that the peak material volumes exceed the dale void volumes. As for the core, it is obvious that the core void volume (Vvc) exceeds the core material volume (Vmc). The coating surfaces were also examined by high-resolution scanning electron microscopy. It can be seen that the morphology of CrN (Fig. 4a) and ZrN (Fig. 4b) coatings differs signifi cantly. CrN coating has a nanocrystalline structure. ZrN Fig. 2. Surface roughness of coatings
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