High temperature oxidation behavior of MoCoB metallic glass

Abstract

The oxidation behavior of a Mo51Co34B15 metallic glass was investigated at 873–973 K in dry air. The oxidation kinetics generally followed a parabolic-rate law, which indicated the rate-controlling step in the oxidation process is diffusion, and the parabolic-rate constants increased with increasing temperature, showing the oxidation rate is closely related to temperature. The thinner oxide layer was mainly composed of CoMoO4, MoO3, CoO, B2O3, and MoB, while the CoMoO4 and B2O3 oxides resulted in a lower oxidation rate, and the presence of MoB also suggested that small amounts of crystallization were taking place beneath the inner layer.