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Effect of alloying heat-resistant packing coatings on their tribotechnical, physical and mechanical properties

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Category: Content №6 2020

Last Updated on 22 December 2020

Published on 30 November -0001

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Authors:

V. O. Boguslaiev, Motor Sich JSC, Zaporizhzhia, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

V. L. Greshta, orcid.org/0000-0002-4589-6811, Zaporizhzhia Polytechnic National University, Zaporizhzhia, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

V. I. Kubich, orcid.org/0000-0002-0939-9092, Zaporizhzhia Polytechnic National University, Zaporizhzhia, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

D. V. Tkach, orcid.org/0000-0003-0851-1481, Zaporizhzhia Polytechnic National University, Zaporizhzhia, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Ye. O. Fasol, orcid.org/0000-0003-4846-9046, Zaporizhzhia Polytechnic National University, Zaporizhzhia, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

V. O. Lekhovitser, orcid.org/0000-0002-4081-360X, Motor Sich JSC, Zaporizhzhia, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2020, (6): 041 - 047

https://doi.org/10.33271/nvngu/2020-6/041

Abstract:

Purpose. To determine the effect of alloying nickel-based packing coatings on friction, wear and microhardness to ensure predictable performance properties at the temperatures of about 1100 C.

Methodology. The friction coefficient and the energy rate of wear were determined regarding the results of applying methods for modeling the thermo-mechanical loading using small-sized samples in the heating chamber that was additionally installed on the -2 friction machine. The microhardness of the samples having different structural states was determined according to GOST 9450-76 on the LECO AMH 43 USA microhardness tester. The evaluation of the nature and microgeometry of the wear debris was carried out using PEM-106 electronic focused-beam microscope. To solve the stated problem, the nickel-based packing coating used at MOTOR SICH JSC, an aircraft manufacturing enterprise of Ukraine, was chosen.

Findings. Based on the study on the microhardness and tribotechnical characteristics, the coating composition which best fits the combination of the examined mechanical properties providing reliable performance of the coatings was selected.

Originality. Graphic patterns of the friction coefficient changes when the coatings interact with the flanges of the rotating disc at different heating stages of the media and the average energy rate of mass wear of their materials were obtained. Based on the study on microgeometry and distribution of the elements in the chemical composition of wear debris, probable areas of destruction of the examined coatings were identified for each composition, which in turn can determine their ability to accumulate stress. It was found out that coating of Composition 3 alloyed with an integrated yttrium-containing CoNiCrAlY master alloy and Composition 2 with a monoyttrium master alloy have the tendency to form a satisfactory packing contour when modeling the thermo-mechanical load of the frictional contact. It was observed that depending on the nature of the thermal effect, there occurs hardening of the surface layers of the coating and of the base metal while increasing the duration of exposure, which is more likely to be attributed to the developing balancing diffusion of alloying elements from the transition zone of coatings.

Practical value. The application of the suggested coating will enable to improve the engine efficiency by reducing the leakage of gases while maintaining the size of the radial clearances, and reduce the fuel consumption per hour.

Keywords: friction coefficient, energy rate of wear, packing coating, nickel alloy, yttrium, microhardness, small-sized sample

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