Abstract:
Hard micro- and nanostructured Ti–Hf–Si–N/NbN/Al$_2$O$_3$ multilayer coatings on steel substrates have been obtained for the first time using various deposition technologies and characterized by a combination of methods. It is established that the proposed coatings possess, in addition to high hardness ($H$ = 47–56 GPa), high elastic modulus ($E$ = 435–570 GPa), and good plasticity index ($W_e$ = 0.08–0.11), a rather low friction coefficient that varies within $\mu$ = 0.02–0.001 depending on the deposition conditions. The coatings remain stable at temperatures above 1000$^\circ$C.