Abstract
The effect of Sc or Y additives (3% (at.)) on oxidation of Moss—Mo3Si composite in the air and a vapor-air environment (10% H2O) has been studied. It was shown that when heating in the air (500 °C, 100 h) on the surface of samples formed a layer of scale from the mixture of MoO3 + SiO2 and MoO3. Doped alloys were found to oxidize much slower than binary composites. Two process periods with different velocity constants were identified by analysis of kinetic functions. The first period was limited by the oxidation rate of the alloy components and the second one — by sublimation of MoO3 from the surface oxide layer. Sublimation in a humid environment was faster than in the dry air.
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