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Registration Number

0215U001181, 0112U005920 , R & D reports

Title

The technology of high-strenth nano- and microstructure coating obtained by combined methods

Head

Beresnev Vyacheslav,

Registration Date

30-01-2015

Organization

Kharkov National University named after V.N. Karazin

Description

The object of study: formation technology of hybrid nanocomposite coatings by means of combined methods. Objective: creating a technology of surface hardening of structural materials by means of combined methods of processing using plasma jets. Research method: the use of plasma-detonation and vacuum-arc methods for formation of hybrid nanostructured protective coatings based on (Ti-Hf-Si)N/ NbN/Al2O3, (Ti-Zr-Si)N, (Ti-Hf-Si)N and WC-Co systems; studying the properties of the coatings obtained by the means of X-ray diffraction, electron microscopy, nanoscale hardness measurement, scratch testing and other methods for analyzing tribological characteristics of the obtained coatings. The report presents the results of the combined method to form nanocomposite hybrid coatings. The paper combines plasma detonation method of obtaining the coatings and ion-plasma deposition techniques. The technology for formation heat-resistant multilayer coatings based on (Ti-Hf-Si)N/NbN/Al2O3 system has been improved. The characteristics of formation of the obtained coatings, as well as their phase composition, structure, state of stress, their physical and mechanical properties have been studied. The physical laws for formation of protective coatings in a combined way have been defined. The evolution of physical, mechanical and tribological properties of the hybrid coatings has been studied. According to the research results it was found that, depending on the physical and technological parameters, the hardness of coatings varies from 47.8 to 56.5 GPa, and the elastic modulus takes values in the range of 435 - 578 GPa. The nanohardness measurements for NbN sublayer has values from 29.4 to 32.3 GPa, and the lower coating consisting of Al2O3 gave a value of hardness from 18.7 to 22.4 GPa. It has been found, that the concentration of the elements Nb and Hf increases with the depth of coating, and the concentration of Ti and N elements is uniform throughout the thickness of the coating. The concentration of Si decreases with depth. It is shown that the developed and investigated coating can be applied to improve the performance of cutting tools, working in extreme cutting conditions.

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Береснєв В.М.
Маліков Л.В.
Торяник І.М.
Турбін П.В.