Patent ID: 7261781
Filing Date: 2007-08-28
Classification: B22F,B82Y,C22C,H01F

Abstract:
1. A nanocomposite magnet having a composition represented by the general formula: (Fe 1-m T m ) 100-x-y-z-n Q x R y Ti z M n , where T is 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 that always includes at least one of Nd and Pr and optionally includes Dy and/or Tb, wherein R includes La only in an amount due to inevitable impurities; and M is at least one 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, m and n satisfying the inequalities of: 10 at %<x≦20 at %; 6 at %≦y<10 at %; 0.5 at %≦z≦12 at %; 0≦m≦0.5; and 0 at %≦n≦10 at %, respectively, wherein the nanocomposite magnet: has an oxygen content of about 20 ppm to about 1,500 ppm by mass; has a nitrogen content of about 10 ppm to about 400 ppm by mass; comprises at least two ferromagnetic crystalline phases including a hard magnetic phase including an R exhibits hard magnetic properties including a remanence B