Patent ID: 6329894
Filing Date: 2001-12-11
Classification: B82Y,H01F

Abstract:
A thin plate magnet comprising a primary mixture of Fe.sub.3 B, .alpha.-Fe, and a coexisting compound phase having an Nd.sub.2 Fe.sub.14 B crystal structure and a composition formula selected from the group of Fe.sub.100-x-y-z R.sub.x B.sub.y M.sub.z, (Fe.sub.1-m Co.sub.m).sub.100-x-y-z R.sub.x B.sub.y M.sub.z, and mixtures thereof, wherein R is an element selected from the group consisting of Pr, Nd, Tb, Dy and mixtures thereof; wherein M is an element selected from the group consisting of Cr, Mn, Cu, Ga, Ag, Pt, Au, Pb, andmixtures thereof; wherein said x,y, and z indicate the relative proportions of the respective R, B, and M such that 1 at %.ltoreq.x<6 at %, 16 at %.ltoreq.y.ltoreq.20 at %, 0.01.ltoreq.z.ltoreq.7 at %, and 0.001.ltoreq.m.ltoreq.0.5, said magnet having a value for iHc of greater than about 2.5 kOe and a value for Br greater than about 9 kG, wherein said primary mixture comprises at least about 90% by volume of said magnet, and wherein said magnet comprises a casting having a fine crystal structure and a thickness of between about 70 .mu.m and about 500 .mu.m.