| 简介 |
The iron-based rare-earth nanocomposite magnet of the present invention has a composition T 100-x-y-z-n Q x R y Ti z M n , where T is Fe or a transition metal element in which Fe is partially replaced by Co and/or Ni; Q is B and/or 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 Al, Si, V, Cr, Mn, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Hf, Ta, W, Pt, Au and Pb. x, y, z and n satisfy 5 ‰¦ x ‰¦ 10 at%, 7‰¦y‰¦10 at%, 0.1‰¦z‰¦5 at% and 0‰¦n‰¦10 at%, respectively. The magnet includes R 2 Fe 14 B-type compound phases and ± -Fe phases forming a magnetically coupled nanocomposite magnet structure. The R 2 Fe 14 B-type compound phases have an average crystal grain size of 30 nm to 300 nm and the ±-Fe phases have an average crystal grain size of 1 nm to 20 nm. The magnet has magnetic properties including a coercivity of at least 400 kA/m and a remanence of at least 0.9 T. |
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