| 摘要 |
PURPOSE:To enhance magnetic property by making the alloy of permanent magnet, which comprises rare-earth element R, B and the remainder of Fe, to be composed of two-phase structure, i.e., ferromagnetic Fe rich phase and nonmagnetic R rich phase. CONSTITUTION:In order to produce a rare-earth iron-based permanent magnet comprising one or more elements R selected among rare-earth elements including Y, B and Fe for the remaining part, material alloy composed of 10-40wt.% R, 1wt.% or less B and the remainder of Fe is melted and crushed, sintered at 1000-1200 deg.C for 0.5-5hr, and applied with aging treatment at 400-1100 deg.C for 1-10hr so as to obtain a permanent magnet of which alloy structure is a crystal component of R2Fe14B and which has a ferromagnetic Fe rich phase as a main phase and a nonmagnetic R rich phase. Thus, the rare-earth iron-based permanent magnet with high (BH)max can be obtained. |
