| 摘要 |
<p>A rare earth-iron-boron permanent magnet alloy having a composition represented by the formula: RaFebBcMd, wherein R represents one or more rare earth elements, M represents at least one element selected from the group consisting of A l , Si, Cu, Nb, W, V, Mo and Ta, 20% or less of Fe may be substituted by Co, and a, b, c and d are atomic % satisfying a: 10-15, b: balance, c: 4-8, and d: 10 or less, the magnet alloy having an average crystal grain size of 0.01-0.2 mu m (0.2 mu m or less in 90% or more by area of the crystal grains). This magnet alloy can be used to provide an isotropic bonded magnets which may be used of PM motors.</p> |
