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Magnetic properties of melt-spun Didymium-Fe-B system alloys and their bonded magnets.

1987; Volume: 11; Issue: 2 Linguagem: Inglês

10.3379/jmsjmag.11.229

1880-4004

H. Yamamoto, Mitsuru Nagakura, T. Miyauchi, K. Hori,

Metallic Glasses and Amorphous Alloys

In melt-spun ribbons of Didymium (Nd-10 %Pr)-Fe-B and Ce-didymium (Nd-15 %Pr-5 %Ce)-Fe-B alloys prepared by the single roller method, the effects of composition, substrate surface velocity and subsequent annealing on the magnetic properties were studied, and their bonded magnets were made of the optimum-quenched ribbons. A maximum energy product of 93.6 kJ/m3 was obtained with 34 wt% (Ce-didymium)-65 wt%Fe-1 wt%B ribbon prepared at a substrate surface velocity of 11.8 m/s.The best magnetic properties obtained in these bonded magnets of 34 wt% (Ce-didymium) -65 wt%Fe-1 wt%B alloy were Br=0.595 T, HCJ= 1410 kA/m, HCB =400 kA/m and (BH)max=60.3 KJ/m3. The temperature coefficients (from 25 to 125°C) of Br and HCB for these bonded magnets were −0.154%/°C and −0.180%/°C, respectively.