| The present study concerns the effects of cerium, didymium contents, sintering, heat-treating conditions and microstructure on the magnetic properties of Ce-Didymium-Fe-B permanent magnets. Best magnetic properties were achieved for Didymium (30%Nd-20%Pr)-Fe-1%B and For 4%Ce-Didymium (80% Nd-l6% Pr-4% Ce)-Fe-l%B by using 35wt% of Didy mium and of 4%Ce-didymium, respectively and by sintering for 1 hour at 1100℃ and heat-treating for 1 hour at 600℃. The magnetic properties of Didymium-Fe-B magnets were better than those of 4%Ce-Didymium-Fe-B and 8%Ce-Didymium-Fe-B magnets but were inferior to those of Nd-Fe-B magnets when all magnet samples were fabricated under optimum processing conditions. The magnetic properties were discussed in relation to the microstructure consisting of R₂Fe_(14)B matrix, Nd-rich and Ce-rich phases along gram boundaries. |
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