| 摘要 |
PURPOSE:To produce a rare earth contg. magnet alloy which is improved in magnetic characteristics by spherical pulverized powder by atomizing the melt of an alloy essentially consisting of rare earth elements including Y by centrifugal force to form the powder. CONSTITUTION:The melt of the rare earth alloy essentially consisting of 1 or >=2 kinds of the rare earth elements including Y is atomized by a centrifugal atomization method in a nonoxidizing atmosphere. The spherical pulverized powder having <=200mu grain size is thereby obtd. The rare earth alloy is expressed by the formula R1-alpha-beta-gammaMalphaAbetaXgamma. R is 1 or >=2 kinds of the raw earth elements including Y, M is 1 or >=2 kinds of Fe, Co, Ni, and Mn, A is 1 or >=2 kinds of Ti, Al, Zr, Hf, V, Nb, Ta, Cr, Mo, and W, X is 1 or >=2 kinds of B, C, N, Si, P, and 0.60<=alpha<=0.85, 0<=beta<=0.10, gamma<0.15. Such pulverized powder alloy yields the magnet having the improved magnetic characteristics when the alloy is made into the magnet by molding, sintering and if necessary, heat treatment. |
