| 摘要 |
PURPOSE:To prevent deterioration in magnetic properties of permanent magnets by controlling C and O2 content in powdery raw material in manufacturing a permanent magnet composed mainly of iron, rare earth elements, and boron by powder compacting method. CONSTITUTION:An iron-rare earth element-boron alloy which is composed of an Fe alloy having a composition containing, by weight, 25-40% R (at least one element among Y and rare earth elements) and 0.7-2.5% B and having the balance consisting of Fe or Fe and at least one element among Co, Al, Nb, and Si and in which C and O2 content is regulated to <=0.05% and <=0.3%, respectively. An ingot of this Fe-base alloy is pulverized, and the resulting powder is oriented in the magnetic field and compacted. The green compact is sintered at 1,050 deg.C to be formed into permanent magnet. In the above, C and O2 content is controlled to a minimum, respectively, so that permanent magnets excellent in magnetic properties can be obtained. |
