| 摘要 |
PURPOSE:To improve the yield of products in the stage of producing an R2T17 magnet alloy consisting of Y as well as rare earth elements and transition metals by burying said alloy in powder of an RT5 rare earth magnet during sintering of powder moldings thereby suppressing the evaporation of rare earths and reducing the variance in the material of the magnet. CONSTITUTION:After an R2T17 (R is Y and rare earth elements, T is transition elements) magnet alloy is melted to ingot, the ingot is cooled and is pulverized down to about 4mum average grain sizes. The powder is molded by pressurizing in a mgnetic field and the resultant molding 1 is put in a vessel 2 and is coated with powder 3' consisting essentially of RT5 such as SmCo5. The vessel 2 is heated in a gaseous Ar atmosphere and is sintered. At this time the Sm, etc. of rare earths in the molding 1 do not evaporate as they are suppressed by the vapor pressure of the Sm in the RT5 powder, whereby the homogeneous R2T17 magnet alloy with less variance in quality owing to the evaporation of SM is produced in high yield. |
