Abstract
This paper deals with the microstructure and properties of oxidation-resistant metal/ceramic coatings produced by the electron beam evaporation of M-Cr-Al-Y alloys and zirconia partially stabilized by yttria. The effect of thermophysical conditions of deposition on the properties of the condensed zirconia and protective coatings is shown. The results of furnace tests in air and gas turbine fuel ash showed that the double-layer metal/ceramic coatings increase the oxidation and corrosion resistance of nickel alloys at 750–1000 °C. Burner tests of specimens and blade models with Co-Cr-Al-Y/ZrO 2 coatings in a gas stream showed that the metallic coatings possess higher thermal fatigue resistance due to the deposition of the ceramic layer of 50–120 μm thickness. The relationship between the thermal cyclic life and multicycle fatigue resistance of alloys with vacuum-deposited metal/ceramic coatings is expressed by a curve with a maximum corresponding to ZrO 2-Y 2O 3 90–120 μm thick. Potential improvement of M-Cr-Al-Y/ZrO 2 coatings is increased in service when a ductile interlayer is inserted between the oxidation-resistant layer and base metal. Data are given about the dependence of the mechanical properties of heat-resistant nickel alloys on ZrO 2-Y 2O 3 coatings of 60–150 μm thickness.
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