Abstract
The blades of modern gas turbine engines are complex structures made of heat-resistant nickel alloys with a complex system of internal cavities. The article describes a method of strengthening samples of a heat-resistant Ni-Cr alloy by applying a composite coating (Cr-Al-Co + ZrO2-Y2O3). The alloy prototypes were fabricated by vacuum melting. An ion-plasma technology of a two-layer coating with an inner metal and an outer ceramic layer on the prepared surface of the heat-resistant alloy matrix was developed. The morphology and structure of the alloy prototypes and the investigated composite coating were studied by scanning electron spectroscopy. The total thickness of the two-layer wear-resistant coating was 17–18 μm. The thickness of the inner layer (Cr/Al/Co) is 10–11 μm and the thickness of the outer ceramic coating (ZrO2-Y2O3) is 6–7 μm. To improve the operational characteristics of the material, an electron-beam surface treatment was proposed. The research results showed a sevenfold increase in surface resistance compared with the initial state.
Highlights
Modern gas turbine engines operate at the temperatures of hot gases’ expansion in a direction transverse to the rows of turbine blades
The blades of modern gas turbine engines are complex structures made of heat-resistant alloys with a complex system of internal cavities [1,2]
The efficiency and service life of blades of this design can be ensured by protecting them from high-temperature gas corrosion
Summary
Modern gas turbine engines operate at the temperatures of hot gases’ expansion in a direction transverse to the rows of turbine blades. The blades of modern gas turbine engines are complex structures made of heat-resistant alloys with a complex system of internal cavities [1,2]. The efficiency and service life of blades of this design can be ensured by protecting them from high-temperature gas corrosion. Heat-resistant protective coatings are obtained by sequential application of layers by gas circulation and ion-plasma methods [3,4]. The use of protective coatings makes it possible to increase the service life by 3–5 times. Owing to the use of such coatings, a higher operating efficiency of the turbine blades can be achieved, as less cooling air is needed to maintain the temperature of the blade or shroud. The service life of the parts increases, because the rate of change in the metal temperature decreases as a result of the heat-insulating effect [5]
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