| 摘要 |
PURPOSE:To manufacture a magnet alloy with superior magnetic characteristics by spraying a molten alloy having a restricted composition consisting of Pr, Fe and Co on a rotating body in vacuum or an inert gaseous atmosphere to rapidly cool the alloy. CONSTITUTION:An alloy consisting of, by weight, 45-90% Pr, 9-55% Fe and 1-50% Co is put in a crucible made of quartz or the like and melted by high frequency heating or other method. The molten metal is sprayed on a rotating body such as a roll or a disk having 2.5-30m/sec surface speed in vacuum or an atmosphere of an inert gas such as Ar from the bottom molten metal outlet of the crucible to obtain a ribbonlike magnet alloy by rapid cooling. In order to further improve the magnet characteristics of the resulting magnet alloy, the alloy is heat treated at a relatively low temp. such as 200-600 deg.C for 0.5-7hr in vacuum or an inert gaseous atmosphere preferably in a magnetic field having <=15,000Oe. |
