Patent ID: 6302972
Filing Date: 2001-10-16
Classification: B82Y,H01F

Abstract:
A material alloy for a nanocomposite magnet, the alloy being represented by a general formula Fe.sub.100-x-y R.sub.x B.sub.y, Fe.sub.100-x-y-z R.sub.x B.sub.y Co.sub.z, Fe.sub.100-x-y-u R.sub.x B.sub.y M.sub.u or Fe.sub.100-x-y-z-u R.sub.x B.sub.y Co.sub.z M.sub.u,where R is a rare-earth element, 90 atomic percent or more of R being Pr and/or Nd, while equal to or larger than 0 atomic percent and less than 10 atomic percent of R being another lanthanoid and/or Y,M is at least one element selected from the group consisting of Al, Si, Ti, V, Cr, Mn, Ni, Cu, Ga, Zr, Nb, Mo, Hf, Ta, W, Pt, Pb, Au and Ag, andthe molar fractions x, y, z and u meet the inequalities of 2.ltoreq.x.ltoreq.6, 16.ltoreq.y.ltoreq.20, 0.2.ltoreq.z.ltoreq.7 and 0.01.ltoreq.u.ltoreq.7, respectively, andwherein the alloy includes a metastable phase Z represented by at least one of a plurality of Bragg reflection peaks observable by X-ray diffraction analysis, the at least one peak corresponding to a lattice spacing of 0.179 nm.+-.0.005 nm, an intensity of the Bragg reflection peak representing 5 to 200 percent, both inclusive, of a maximum intensity of a halo pattern, andwherein an intensity of a (110) Bragg reflection peak of body-centered Fe represents less than 5 percent of the maximum intensity of the halo pattern.