Abstract
The oxidation kinetics of the germanium-alloyed AK7M2 + 0.05% Sr alloy in air at temperatures of 773 K, 798 K, and 823 K is investigated by the thermogravimetric method. It is revealed that the addition of germanium up to 0.6 wt % decreases the oxidation rate, as evidenced by an increase in the apparent activation energy of oxidation from 14.7 to 79.8 kJ/mol, which drops again to 25.2 kJ/mol as the Ge content increases to 1.0 wt %. The true oxidation rate varies in limits of (4.30–6.00) × 10−4 kg/(m2 s), depending on the amount of alloying component. Silicon dioxide SiO2 and germanium dioxide GeO2 are also revealed in oxidation products of alloys along with γ-Al2O3.
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