Abstract
Oxidation is an integral part of some high temperature recycling routes for rare earth permanent magnets. This paper deals with a study of oxidation kinetics of commercial permanent (Nd,Pr)FeB magnet samples, re-sized to 5 × 5 x 10 mm, in the temperature range 700–1500 K. The results show that the oxidation behaviour follows a parabolic rate law and that the kinetics can be described using the Ginstling–Brounshtein diffusion model. In line with the microstructure study that shows three different oxidation mechanisms, the kinetics study also reveals that there are probably three different rate-controlling mechanisms in the temperature range studied.
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