Methodology of formation of multi-layered coatings for carbide cutting tools

Abstract

-In this paper, we consider the development of the methodology for the formation of nanostructured multi-layered composite coatings to improve the cutting properties of carbide cutting tools in the high-performance machining of various materials. The methodology for the formation of the composition, structure, and properties of developed composite coatings with a three-layered architecture was based on the phenomenological theory of the thermodynamic criteria for the evaluation of adhesion, and the assumption of the prevailing adhesion-fatigue wear of carbide cutting tools. The synthesis of coatings was carried out through filtered cathodic vacuum-arc deposition. The hardness, adhesion, and cutting properties of the developed coatings deposited on the carbide substrates were studied. It was found that the synthesized coatings had a nanoscale grain structure and thickness of sublayers, which significantly increased the area of intergranular and interlayer boundaries and provided a considerably balanced relation of the most important characteristics of the coating, such as "hardness-heat resistance". Such structures are characterized by increased toughness and resistance to the formation and development of "brittle" cracks and more efficient resistance to fractures in conditions of complex stress from external influences. It is revealed that, in the longitudinal turning of steel, carbide tools with the developed coatings demonstrated a tool life of five times higher than the tool life of uncoated tools and up to three times higher than the tool life of tools with standard coatings.

Working efficiency of cutting tools with multilayer nano-structured Ti-TiCN-(Ti,Al)CN and Ti-TiCN-(Ti,Al,Cr)CN coatings: Analysis of cutting properties, wear mechanism and diffusion processes

“…For deposition of NMCC, a vacuum-arc VIT-2 unit was used, which was designed for the synthesis of coatings on substrates of various tool materials. The unit was equipped with an arc evaporator with filtration of vapor-ion flow, which was named filtered cathodic vacuum-arc deposition (FCVAD) in this study [36][37][38][39], and were used for deposition of coatings on tools to significantly reduce the formation of the droplet phase during the formation of coating. The use of the FCVAD process does not cause structural changes in carbide and provides:…”

Application of carbide cutting tools with nano-structured multilayer composite coatings for turning austenitic steels, type 16Cr-10NI

“…A special process filtered cathodic vacuum-arc deposition [23][24][25] was used. Table 3 presents the parameters of the process of deposition of coatings.…”

“…As with the previous coating, the addition of aluminum and niobium increases the hardness and wear resistance, respectively, while providing greater impact toughness and heat resistance. Based on the previous studies [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25], coating thicknesses of 4-5 mm were assumed as optimal for turning of steels.…”

Experimental investigation into characterization and machining of Al + SiCp nano-composites using coated carbide tool

“…Their results showed that the hardness and tensile strength increases with the increase in the weight percentage of SiCp particles. Grigoriev and Vereshchaka [31] studied the methodology of formation of multilayer coatings for carbide cutting tools. Similarly, Gangil et al [32] studied the influence of shoulder geometries and tool pin on microstructure of friction stir processed AA6063/SiC composites.…”