Abstract
The temperature ranges of structural transformations in WC-Co and Ti1-xAlxNin the process of cathode-arc evaporation are analyzed. The limiting values of the WC-Co temperature before the deposition of the coating correspond to 773 ... 873 K, after which the hardness of WC-Co and, as a consequence, the hardness of the composition WC-Co / Ti1-xAlx deteriorates. Analysis of the coating structural transformations made it possible to establish the structuring stages of the Ti1-xAlx coating during its deposition. Wear test was carried out for Ti1-xAlx coatings formed at each structuring stage. Wear test were carried out according to the finger-disk scheme at 300 K in coolant-cutting fluid on a laboratory friction machine. The wear behavior of the Ti1-xAlx coating are unstable at 773 K, then improve at 773 ... 853 K, stabilize with an increase in temperature to 963 K. The nanostructured Ti1-xAlx coating formed in the temperature range T sub/T m = 0.18... 0.23have the best complex of wear properties in comparison with analogues.
Highlights
Despite many years of experience in the optimization and use of cathodic arc evaporation, reducing the instability of coating properties remains an urgent problem, in particular, in understanding the general patterns of formation of the real structure of the coating
3.1 Structural transformations of the Ti1-xAlxN coating during cathodic arc evaporation
The coating structuring stages depending on its temperature are revealed
Summary
Despite many years of experience in the optimization and use of cathodic arc evaporation, reducing the instability of coating properties remains an urgent problem, in particular, in understanding the general patterns of formation of the real structure of the coating. Several scientific papers have discussed the relationship connection of coating wear behaviour with surface roughness [1, 2], surface contamination [3], surface temperature [4], and inclusions [5]. Structural stability and high wear behaviour up to 1273 K are mandatory protective requirements for coatings. The article aim is to study the correlation between the wear properties of the Ti1-хAlxN coating with the structural transformation of the substrate and the coating itself during its deposition by the CAE method. The critical temperatures of the materials of the substrate and Ti1-хAlxN coatings will be established, above which coating properties deterioration occurs
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