Functional Testing of Nanostructured Wear-Resistant Coatings Obtained by High-Entropy Target Cathodes

Machine-building Engineering and Machine Science


Аuthors

Migranov M. S.*, Mitrofanov A. P., Kireev R. M., Mustafaev E. S., Gusev A. S.

Moscow State University of Technology "STANKIN", 1, Vadkovsky lane, Moscow, 127994, Russia

*e-mail: migmars@mail.ru

Abstract

The exigency for both machine and aircraft engine building continuous development is being followed by elaboration and introduction into industry of new grades of machined and tool materials with unique physical-and-mechanical properties and operating at high temperatures and sign-changing loads. The required the strength increase herewith of strength characteristics of the material being processed, subjected to the edge tool machining, leads to the drastic productivity degradation and its effectiveness in total, as well as consumption increase of the flow gain of the cost intensive hard-alloy and tungsten-containing metal-cutting tools. The industrial progress of machine building production depends mostly on volumes and number of science-intensive developments for creating high-tech processing methods and prospective materials with application of metal-cutting tools with innovative high-tech wear resistant coatings. The article presents the results of theoretical-and-experimental research on developing and evaluating of the wear resistant coatings from high-entropy cathode-targets for high-efficiency lathe work machining of the chrome-nickel alloys, employed while the critical parts of  the state-of-the-art gas turbine engines (GTE) production. The authors propose a complex methodology for experimental and evaluation of tribotechnical characteristics of the high-entropy coatings by developing and applying the advanced adhesion installation and conducting wear-resistant tests, while the HN73MBTYu-VD chromium-nickel alloy lathe turning by the hard-alloyed tool from the VK8. In the prospect, the authors suppose subsequent studies of the materials contacting surfaces, i.e. the indenter with wear-resistant coating and a dimple, as well as the tool cutting edge and the processed surface, with a view to the secondary structures forming with both lubricating and strengthening properties. These structures are being formed due to the high-temperature plastic deformation in the cutting zone, which would elucidate mechanism of the contact processes and the tool wear resistance enhancing. The adhesion installation bringing-up to date was aimed at accuracy enhancing of the obtained data and its visualizing on the monitor screen to control the current process, as well as structural elements mechanization to facilitate the adjustment work and safety ensuring while the temperature tests conducting. By the results of the tribological tests conducted in a wide range of temperature changing at the contact for the HN73MBTYu-VD - VK8 pair, it was found that the best tribotechnical characteristics were being ensured by the Al20Ti20Zr15V15Cr15Nb15 wear resistant coating (the 12% improvement). This is being confirmed by the obtained data on the temperature-force and wear-resistant tests at the edge tool machining. Series of studies on both worn surfaces topography and metallographic character were performed to substantiate the obtained data. The results of the “indenter-sample” conjugated surfaces  and formed dimples studying by the optical analysis, as well as their measuring with the stylys Dektak XT profile meter, allowed accomplishing both quantitative and qualitative evaluation of the voluminous wearing. It allowed as well studying topography and distribution of the formed elements of the adhesion interaction (spreading, welding and cleavage) depending the temperature and applied loads. Morphological analysis of the indenter and groove surface as well as chemical composition analysis of the surface with a view to the materials inter-transfer and coatings destruction was accomplished by the scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS). The results of the secondary-ion mass-spectrometry (SIMS) of the contacting surfaces indenter with high-entropy coating–the sample from the processed material revealed the following. Forming in the course of friction (cutting) at the high temperature force loads of the special secondary structures in the form of oxides and other compounds possessing lubricating and hardening properties different by both composition and tribological properties from the basic original materials.

Keywords:

high-entropy cathodes-targets, multilayer nanostructured wear-resistant coatings, functional testing, heat-resistant chromium-nickel alloy, adhesion installation

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