Nd-Fe-B-Co-Al based permanent magnets with improved magnetic properties and temperature characteristics

Mizoguchi, T.; Sakai, I.; Inomata, K.
May 1986
Applied Physics Letters;5/12/1986, Vol. 48 Issue 19, p1309
Academic Journal
Magnetic properties have been studied with respect to the boron concentration on Nd-Fe-B based magnets. The combined addition of cobalt and aluminum in a Nd-Fe-B magnet is remarkably effective for increasing magnetic hardness in the region of low boron concentration. The following magnetic properties were attained for Nd15Fe62.5B5.5Co16Al1 :Br=13.2 kG, iHc=11.0 kOe, (BH)max=41.0 MGOe, and Tc=500 °C. The reversible temperature coefficient of the remanence of the magnet is -0.071%/deg, approximately one-half of the Nd15Fe77B8 magnet.


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