| 摘要 |
PURPOSE:To manufacture the permanent magnet in which the amt. of expensive Co to be used is reduced and having excellent magnetic characteristics at low cost by subjecting the powder of an alloy obtd. by mixing specified rare earth elements, B and Fe in specified ratios and melting the mixture to orientating, compacting and sintering in a magnetic field. CONSTITUTION:An Fe-rare earth-B series alloy contg., by atom%, 12.5 to 20.0% lanthanoide series rare earth elements (in which the amt. of one or more kinds among Dy, Tb, Gd, Ho, Er, Tm and Yb is regulated to 0.05 to 5% and the balance one or more kinds of Nd and Pr, or the total amt. of Nd and Pr is regulated to >=80% and the balance at least one kind among the rare earth elements including Y except the above Dy to Yb), 4 to 20% B and the balance Fe in which a part is substituted by Co by <=35% for the total compsn. as well as, as the elements to be added, contg. specified amounts of at least one kind among Ti, Zr, Hf, Cr, Mn, Ni, Ta, Ge, Sn, Sb, Bi, Mo, Nb, Al, V and W is refined, is cooled to pulverize and is thereafter orientated, compacted and sintered in a magnetic field. The permanent magnet in which the amt. of expensive Co to be used is reduced and having excellent magnetic characteristics can be obtd. |
