Abstract
Oxidation has been explained as one possibility for unacceptable and irreversible coercivity loss of 2:17 type SmCo-based magnets at high temperatures over 550 °C, but the question for how oxidation affects coercivity in the magnet has not been fundamentally answered. In this work, oxidation and its induced degradation of the magnetic phases of a Sm(CobalFe0.22Cu0.08Zr0.02)7.5 magnet in air at 600 °C have been investigated by using transmission electron microscopy and correlated with the demagnetization curves measured. It shows that the coercivity loss, which is significantly increased with oxidation time, is small and independent of time in the magnet unaffected by oxidation. The reason lies in that the 2:17 cell and 1:5 cell boundary, although they have been completely disintegrated in the oxidized part by external oxidation of Co, Fe, and Cu and internal oxidation of Sm, remains in the unoxidized part except that 1:5 boundary close to the oxidized part is decreased in thickness and Cu content.
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