Abstract
The coercivity of hot-deformed magnets is enhanced with slight reduction of remanence by spraying Pr70Cu30 powders on magnets’ precursor melt-spun Nd–Fe–B powders. The distribution of rare earth rich phases in diffused sample is superior to original magnet. The thermal stability of the diffused magnets is comparable to the sintered sample with 1 wt% Dy content and much better than the sintered grade 42SH HRE-free sample. The reversed magnetic domains of the pre-saturated samples appear when the temperature reaches 125 °C in coarse grains near ribbon surface and propagated like avalanche by further increasing the temperature. The thermal stability of hot-deformed magnet can be largely optimized from the magnetic domain variation dependent on temperature enhancement.
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