Rare earth metal-containing alloys for permanent magnets

Abstract

The invention provides a rare earth metal-containing alloy for permanent magnets having a composition expressed by the formula Sm.sub.1-.alpha. Ce.sub..alpha. (Co.sub.1-x-y-u-v-w Fe.sub.x Cu.sub.y Ti.sub.u Zr.sub.v Mn.sub.w).sub.z, in which the suffixes are each a numerical value as defined by: 0.1.ltoreq..alpha..ltoreq.0.90; 0.10.ltoreq.x.ltoreq.0.30; 0.05.ltoreq.y.ltoreq.0.15; 0.002.ltoreq.u.ltoreq.0.03; 0.002.ltoreq.v.ltoreq.0.03; 0.005.ltoreq.w.ltoreq.0.08; with the proviso that 0.01.ltoreq.u+v+w.ltoreq.0.10; and 5.7.ltoreq.z.ltoreq.8.1 . The permanent magnets prepared with the alloy have very high magnetic properties, especially, in the coercive force and the maximum energy product even better than those obtained with a samarium-based alloy along with good machinability as in the cerium-based alloys suitable for mass production.

Dependencies are inferred from the claim text.