Development of wear-resistant coatings compounds for high-speed steel tool using a combined cathodic vacuum arc deposition

Abstract

The article presents the results of working out for a wear-resistance complex (WRC), formed on the working surfaces of the HSS tools, in order to increase their efficiency. Wear-resistant complex includes nitride layer, which increases the plastic strength of the HSS tool cutting wedge and cutting tool wear resistance, as well as a three-layer nanostructured composite coating, increases lifetime of a HSS tools. Equipment combining the processes of ion nitriding in the gas plasma and the formation of nanostructured multilayer composite coatings in the filtered metal-gas plasma cathode vacuum arc discharge has been developed. Particular attention is paid to the study of the regularities of formation of the nitride layer and optimization of its parameters and structure, as well as the study of the properties and structure of functional coating layers, depending on the parameters of the deposition process. The parameters of the combined cathodic vacuum arc processing (CCVAP), provides a minimum intensity of tool wear during the cutting process. Also conducted research certification cutting tool properties of HSS with WRC, which made it possible to determine the optimal parameters WRC, which gives the maximum increase in tool life for a variety of cutting conditions as compared to uncoated HSS tool, as well as with standard commercial coatings.

Research of mechanical and cutting properties, wear and failure mechanisms of nano-structured multilayered composite coating Ti-TiN-(NbZrAl)N

“…The unit was equipped with an arc evaporator with filtration of vapour-ion flow, which in this study were named as filtered cathodic vacuum arc deposition (FCVAD) [1][2][3][4]13,14], which were used for deposition of coatings on tool of significantly reduces the formation of droplet phase during the formation of coating.…”

“…Out of various types of wear-resistant coatings, developed and implemented in recent years, multilayered composite coatingswith gradient structure, as well as multi-component coatings should be noted [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

“…The coating Ti-TiN-(NbZrAl)N under study has a threelayered architecture [1][2][3][4], including adhesive sublayer Ti, intermediate layer TiN, and wear-resistance layer (NbZrAl)N.…”

“…Nano-structured multilayered composite coating Ti-TiN-(NbZrAl)N was selected as an object of the study due to the following factors [1,3,4]: ■ ■ a good combination of high hardness and resistance to brittle fracture, which was shown by the coatings on the basis of system (NbZrAl)N during earlier studies; ■ ■ a role of coating Ti, confirmed during earlier studies, as an optimal adhesive sublayer that provides good adhesion both between tool substrate and coating and between adhesive and intermediate layers of coating; ■ ■ good results in tool life of metal cutting tool with the above coating shown during tests conducted earlier [1,3,4]. One of the objectives of this research was to study failure mechanism of nano-layered multi-component systems operating under conditions of high thermal and mechanical stresses arising in the cutting zone.…”

Comparative analysis of cutting properties and nature of wear of carbide cutting tools with multi-layered nano-structured and gradient coatings produced by using of various deposition methods

“…A number of papers are devoted to various studies of multi-layered composite nano-structured coatings with three-layer architecture [16][17][18][19], as well as nano-structured coatings of different compositions [20][21][22][23]. In particular, the studies were focused on such systems as Ti-TiN-(TiCrAl)N [16,17], Zr-(Zr,Cr)N-CrN and Ti-TiN-(Ti,Cr,Al)N [18]; Ti-(AlCr)N-(TiAl)N, Ti-(AlCr)N-(TiCrAl)N, Zr-(AlCr)N-(ZrCrAl)N [19].…”