Oxide Sublimation during the High-temperature Oxidation

of Nickel Alloys with Protective Coatings

E. G. Ivanov

Zhukovskii Air Force Academy

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Received October 16, 2006

Abstract — It is shown that the oxidation of heat-resistant alloys is accompanied by a sublimation of the oxides MoO₃, WO₃, Al₂O₃, and CrO₃. The determinant in the sublimate is the molybdenum content, exceeding that in scale by a factor of 50–100. Protective coatings diminish the sublimation, rather than fully eliminate it. To diminish the molybdenum oxide sublimation decisively, it is expedient to alloy the coating with magnesium or magnesium oxide.