Oxide sublimation during the high-temperature oxidation of nickel alloys with protective coatings

It is shown that the oxidation of heat-resistant alloys is accompanied by a sublimation of the oxides MoO(3), WO(3), Al(2)O(3), and CrO(3). 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.