Improvement of the Physical and Mechanical Properties of the Cutting Tool by Applying Wear-resistant Coatings Based on Ti, Al, Si, and N

Abstract

From the great variety of methods to improve the efficiency of cutting tools, it is necessary to highlight the methods of applying wear-resistant coatings, which in recent years are increasingly used. Applying wear-resistant coatings on the cutting tool can significantly increase its efficiency and intensify machining modes. Mechanisms of strengthening the wear-resistant coating for materials have been analyzed under the impact of technological parameters of coating condensation process on its structure parameters and mechanical properties, formation of single and multi-element coatings based on titanium nitrides, aluminum, and silicon, the transformation of coating properties by obtaining complex coatings, and principles formation of complex coatings designed for different cutting tools. The influence of the coating on the mechanical properties of high-speed steel is shown. In the magnetron sputtering coatings on P6M5 steel samples, the microhardness of the coatings is TiN – 20–24 GPa, AlN – up to 16 GPa, TiAlN – up to 35 GPa, AlTiN – up to 32 GPa, TiAlSiN – 32–37 GPa, including while the microhardness of the substrate of steel P6M5 – 6–9 GPa. The microhardness of TiAlN and TiAlSiN coatings applied on an instrumental basis is 1,5 – 1,9 times higher than the microhardness of TiN, AlN coatings. It was found that the wear intensity of P6M5 steel without coating is 6 times higher than with AlTiN, TiAlN, and TiAlSiN coating, 3 times higher than with TiN and AlN coating. The coated tool is characterized by increased reliability and higher stability and allows the processing process with higher cutting modes.

Composition, Structure, and Properties of Ti, Al, Cr, N, C Multilayer Coatings on AISI W1-7 Alloyed Tool Steel

“…It is established that the coating of TiN titanium nitride in friction with steel contributes to reducing the coefficient of friction compared with the coefficient of friction of steel pair by 2.1 times. In the same work [31], TiN coatings reduce the friction coefficient to a small extent, and even the chromium carbide coatings increase.…”

“…The coefficient of friction was determined in the conditions of the formed indentation wear, which corresponds to the actual operating conditions of the cutting tools. An analysis of the literature [30,31] showed the effect of coatings on the coefficient of friction during tests under sliding friction conditions without lubrication according to the scheme of the pin-disk. It is established that the coating of TiN titanium nitride in friction with steel contributes to reducing the coefficient of friction compared with the coefficient of friction of steel pair by 2.1 times.…”

Structure and Properties of Wear-Resistant Nanostructured Coatings Based on W, Cr and N

“…Studies of wear-resistant coatings based on Ti-N, Zr-N, Mo-N and Cr-N coatings show their high hardness and excellent tribological characteristics. Such coatings are promising materials for wide application, for example, as protective coatings against rapid tool wear [1][2][3][4][5][6][7][8][9][10][11]. Along with this, the structure and tribological properties of W-N coatings have not been studied much.…”

“…A wide range of scientific research is devoted to the study of the material properties of nanostructured coatings with universal [13] and high wear-resistant characteristics [3,[14][15][16]. Among various coatings, nitride nanocomposite or nanolayer systems are studied quite widely [5,7,9,11,13,14]. Transition metal nitrides are considered as a protective coating due to their excellent properties in terms of hardness, wear resistance and corrosion resistance.…”

Improvement of the Dynamic Quality of Cantilever Boring Bars for Fine Boring

“…Dampers are often used to suppress the vibrations of different spatial forms, for example, longitudinal or transverse, which adversely affect the errors in the shape of crosssections [10,11]. The problems of vibration cutting were studied to suppress vibrations normal to the machined surface when imposing vibrations tangential to the machined surface [12].…”