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2022 №04 (05) DOI of Article
10.37434/tpwj2022.04.06
2022 №04 (07)

The Paton Welding Journal 2022 #04
The Paton Welding Journal, 2022, #4, 34-42 pages

Analysis of modern experience in development of sealing coatings for parts of gas turbine engines (Review)

Yu.S. Borysov, N.V. Vihilianska, O.M. Burlachenko, L.P. Olevska, V.M. Lopata


E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: olevska@paton.kiev.ua

Abstract
In the work, the experience in development of sealing thermal coatings for parts of gas turbine engines was analyzed. It was found that the tasks of developing compositions and technologies of thermal spraying of sealing coatings intended to provide the optimal radial clearance between components of stator and rotor in order to reduce the consumption of technological fuel and improve the efficiency coefficient of engines, are relevant. The principles of optimi􀁝ing the composition of sealing coating material were described. They consist mainly in the combination of ease of plunging a blade into coating with resistance to erosion wear, which provides the operation efficiency of coating with its fatigue life. The temperature modes of operation of sealing coatings in different sections of gas turbine engine were determined. For spraying of sealing coatings applying thermal methods, composite powders are used, the composition of which corresponds to the concept of metal solid lubricant. As a metal component, Ni, AlSi, Ni- and Co-alloys are used and as a solid lubricant, graphite, hexagonal boron nitride, betonite and polyester are used. For high-temperature sections of turbines, a combination of a stabilized zirconium oxide with hexagonal boron nitride and polyester is used. The composition of these combinations determines the temperature zone of their use, related to the working conditions of compressor or turbine.
Keywords: sealing coating, thermal spraying, matrix, solid lubricant, abrasion, erosion resistance, compressor, turbine

Received: 30.03.2022
Accepted: 30.06.2022

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Suggested Citation

Yu.S. Borysov, N.V. Vihilianska, O.M. Burlachenko, L.P. Olevska, V.M. Lopata (2022) Analysis of modern experience in development of sealing coatings for parts of gas turbine engines (Review). The Paton Welding J., 04, 34-42.