| 摘要 |
PURPOSE:To increase the mechanical strength by a method wherein rare earth- iron-boron alloy powder and rare earth-based alloy powder in a specific composition are wet-mixed with one another to be sintered later. CONSTITUTION:The title permanent magnet is mainly composed of 8-40atm% of R (R represents at least one kind out of rare earth elements including Y) 50-85atm% of Fe, 2-30atm% of B and not exceeding 0.15wt.% of O. This rare earth iron-boron alloy particles are wet-crushed to produce a slurry. Next, rare earth-based alloy powder is directly mixed with the slurry leaving the dried up state thereof intact further wet-molded in a magnetic field for sintering step later. Through these procedures, the oxygen concentration in the magnet is lowered for enhancing the mechanical characteristics in the grain boundry as well as the mechanical strength of the magnet. Furthermore, the wettability in the sintered step can be enhanced due to the decrease in the oxygen amount on the particle surface to make the surface of magnetic particles smooth thereby enhancing the magnetic characteristics thereof. |
