Uniformity Evaluation for the Mechanical Properties of an AlCrN Coating for Tribological Application Using Probe Methods
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mity Evaluation for the Mechanical Properties of an AlCrN Coating for Tribological Application Using Probe Methods T. A. Kuznetsovaa, *, V. A. Lapitskayaa, S. A. Chizhika, B. Warcholinskib, A. Gilewiczb, S. M. Aizikovichc, B. I. Mitrinc, and L. I. Krenevc aLuikov
Heat and Mass Transfer Institute, the National Academy of Sciences of Belarus, Minsk, 220072 Belarus b Koszalin University of Technology, Koszalin, 75-453 Poland c Don State Technical University, Rostov-оn-Don, 344002 Russia *e-mail: [email protected] Received January 12, 2020; revised February 22, 2020; accepted February 25, 2020
Abstract—The results are presented for studies concerning the microstructure, phase composition and mechanical properties of an Al–Cr–N coating obtained by means of the cathode-arc evaporation of Al70Cr30 alloy. The values of the elastic modulus (E) and microhardness (H) of the coating are determined using the nanoindentation method. The contrasts of the adhesion forces in the Al–Cr–N coating, the friction coefficients and the specific volumetric wear are obtained using atomic-force microscopy. Keywords: coating, AlCrN, elastic modulus, microhardness, wear DOI: 10.1134/S1027451020050328
INTRODUCTION Commercial requirements associated with an increase in the efficiency and processing rate make the problem of the longevity and reliability of cutting tools extremely important. Coatings based on transitionmetal nitrides used for these purposes exhibit good mechanical properties, a high hardness and elastic modulus, good adhesion, and high wear- and corrosion resistance [1–4]. At present, preference is given to compositions that can combine several properties. Over recent decades, coatings of tribological purposes, as a rule, are multicomponent systems [5, 6]. Adding a new element or modifier makes it possible to change the surface properties of the conventional composition to a considerable extent, and expand the scope of its application [7, 8]. CrN coatings are widely used in metal processing on account of their good tribological properties and corrosion resistance [9, 10], but their hardness and oxidation resistance are not always sufficient to meet the requirements of modern machining. The addition of metallic or nonmetallic elements (Ti, Si, Al, C, B) to CrN can improve the characteristics of the coatings. One of the most promising ternary systems is represented by Al–Cr–N due to its excellent oxidation resistance and high mechanical properties [11]. The Al–Cr–N coatings exhibit a better wear resistance on account of the formation of oxide layers on worn surfaces in the course of operation. The addition of aluminum to CrN provides an increase in the wear resis-
tance therein at a high temperature. In comparison to CrN, TiN and TiAlN, the Al–Cr–N coatings are characterized by good oxidation resistance up to 850– 900°С and by an almost constant hardness up to 800°С. The properties of the Al–Cr–N coatings depend on the concentration of aluminum therein. At an Al content below 75%, a cubic c-AlN phase is formed in the Al–Cr–N system [
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