Nanostructured Multilayer Composite Coatings on Ceramic Cutting Tools for Finishing Treatment of High-Hardness Quenched Steels

Abstract

The functional role of nanostructured multilayer composite coatings (NMCC) deposited on the operating surfaces of replaceable faceted cutting inserts (CI) from cutting ceramics based on aluminum oxides with additives of titanium carbides is studied. It is shown that the developed NMCC not only raise substantially the endurance of the ceramic tools under high-speed dry treatment of quenched steels but also improve the quality and accuracy of processing of the parts and the ecological parameters of the cutting process.

Improvement reliability of cutting ceramic through use of damping system and nanostructured multilayered composite coatings

“…It is found that in action of external thermomechanical stresses on contact areas of cutting tool, as well as in development of wear centers, particularly on flank face, the ceramic tool is exposed to complex stress effect, resulting in brittle fracture of its contact areas and cutting edge [13][14][15][16][17][18].…”

Nano-scale multi-layered coatings for improved efficiency of ceramic cutting tools

“…The most probable mechanism of failure of a ceramic tool is brittle fracture of cutting wedge [1][2][3][4][12][13][14][15]. This occurs because of the lower brittle strength of the ceramic tool material as a b compared with the corresponding characteristics for carbide material.…”

“…Therefore, ceramic tools are very sensitive to thermal cycling loads and are characterized by an increased tendency to micro/macro-brittle failure at contact stresses higher than 900-1000 MPa, which predetermines the very narrow scope of application (K01-K10, P01-P10) [1,3]. An effective method for overall improvement of physical and mechanical properties of cutting ceramic is the deposition of modifying functional coatings on the working surfaces [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Thus allowing a control of contact processes in order to change thermomechanical strain of the cutting edges and the nature of wear.…”

“…In this respect, large-scale studies are currently undertaken to improve the properties of cutting ceramic through deposition of functional coatings. The wide use of this technology for dry high speed shape-generating machining provides the significant cost-efficiency while reducing negative impacts on the environment and personnel health [14][15][16][17][18][19][20][21][22][23][24]. In contrast to carbide and high-speed steel, for which the use of modifying coatings provides positive effects, the benefits of coatings for ceramic cutting tools are not always obvious.…”

Multilayer composite nanoscale coatings as a method to increase reliability and tool life of cutting tools made of mixed ceramic Al2O3-TiC

“…The analysis of the methods used to form functional coatings on working surfaces of ceramic blade tool has found out that at present, for the above purposes, the method of Physical Vapour Deposition (PVD) is widely used [6][7][8][9]. The concept for formation of modifying coatings for a blade tool made of cutting ceramic was based on the characteristics of physical-mechanical and thermal properties.…”