Abstract
To improve the corrosion resistance and magnetic properties, Al 85Cu 15 (at.%) compound powders were added to (Pr, Nd) 14.8Fe 78.7B 6.5 sintered magnets as grain boundary modifiers. The corrosion resistance was found to be remarkably improved by small additions of Al 85Cu 15 powders. When 1.2 wt% Al 85Cu 15 was added, the corrosion rate of magnets in humid environments was reduced by two orders of magnitude. This is partly due to the stability enhancement of the (Pr, Nd)-rich intergranular phase by Cu and Al. In addition, the occurrence of the Cu-rich phase ((Pr, Nd) 22Fe 56Cu 10Al 2O 10), whose open-circuit potential is higher than the (Pr, Nd)-rich intergranular phase, may be another reason for the improvement of the corrosion resistance. Furthermore, the magnetic properties of (Pr, Nd) 14.8Fe 78.7B 6.5 were also improved by adding 0.3–1.2 wt% Al 85Cu 15. Optimum addition amount was 0.6 wt%. The improvement of the magnetic properties may be related to the microstructural modification and the increase of magnet density.
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