Open AccessINFLUENCE OF THERMOPHYSICAL AND PHYSICO-MECHANICAL PROPERTIES OF CATHODES ON DEFECTS FORMATION AND COMPOSITION OF TI1–XALXN COATINGS DURING CATHODIC ARC
Author(s) -
Анна Каменева,
Natalya Kameneva
Publication year - 2020
Language(s) - English
DOI - 10.15593/2224-9982/2020.63.02
Subject(s) - materials science , coating , tribology , deposition (geology) , evaporation , cathodic protection , metallurgy , alloy , composite material , substrate (aquarium) , cathodic arc deposition , electrochemistry , electrode , paleontology , chemistry , physics , oceanography , sediment , biology , geology , thermodynamics
The effect of the thermal state of the hard alloy and the Ti1−xAlxN coating during its cathodic arc evaporation on the physicmechanical and tribological properties of the coating has been studied. The dependence of the structure formation process of the Ti1−xAlxN coating on its temperature during deposition was obtained experimentally. A nanostructured Ti1–xAlxN coating is formed in the range 850–1015 K at a heating rate of 6 K / min. A decrease in the hardness of the HG30-Ti1−xAlxN composition at temperatures above 960 K was experimentally revealed. The decrease in the hardness of the HG30-Ti1−xAlxN composition under these temperature conditions is caused by a significant increase in the plasticity zone and grain size WC, as well as a decrease in the hot hardness of the HG30 alloy. Thus, it has been revealed that the optimum deposition temperature of the coating on HG30 should not exceed 850–900 K. The high voltage and duration of ion cleaning of the HG30 substrate are corrected to reduce its initial temperature before the deposition of the Ti1−xAlxN coating by the method of cathodic arc evaporation. By optimizing the thermal state of the HG30 substrate and the nanostructured Ti1−xAlxN coating during its deposition, it became possible to increase the physicmechanical properties and reduce the friction coefficient of the Ti1−xAlxN coating. Compared to foreign analogs, the obtained Ti1−xAlxN coating has a higher wear resistance (H / E = 0.1), plastic deformation resistance (H3 / E2 = 1.31 GPa) and elastic recovery (Wе = 76 %). Monitoring the thermal state of the substrate and the Ti1−xAlxN coating during its deposition makes it possible to control the process of its structure formation, as well as to prevent the gradient of the composition and properties of the formed coatings, and to increase the thermo-mechanical load on the tool and parts during cutting and operation. This technique can be used for other thin-film coating methods.