Patent ID: 7842140
Filing Date: 2010-11-30
Classification: B22D,B22F,B82Y,C22C,H01F

Abstract:
1. An iron-based rare-earth nanocomposite magnet having a composition represented by the formula:T 100−x−y−z−n Q x R y Ti z M n , where T is either Fe alone or Fe in combination with at least one element selected from the group consisting of Co and Ni; Q is at least one element selected from the group consisting of B and C; R is at least one rare-earth element including substantially no La or Ce; and M is at least one metal element selected from the group consisting of Al, Si, V, Cr, Mn, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Hf, Ta, W, Pt, Au and Pb, the mole fractions x, y, z and n satisfying the inequalities of wherein the magnet includes R wherein the R wherein a ratio of the average crystal grain size of the R wherein the magnet has magnetic properties including a coercivity of at least 400 kA/m and a remanence of at least 0.9 T.