| 摘要 |
PURPOSE:To improve the energy product of a magnet in the stge of producing an R2T17 magnet alloy consisting of Y as well as rare earth elements and transition metals by a powder metallurgical method by pressurizing the alloy in specific directions during sintering and solutionizing treatments to deform. CONSTITUTION:An R2T17 (R is Y, rare earth elements, T is transition elements such as Co) magnet alloy represented by Sm2(Co-Fe-Cu)17 is melted to ingot, and after cooling, the ingot is pulverized down to about 4mum average grain sizes. After the powder is molded by pressurizing in a magnetic field, the moldings are degassed in a vacuum, and while the moldings are pressurized so as to be deformed in the direction at a right angle to the direction where the powder is easy to magnetize during molding, in an Ar atmosphere, the moldings are subjected to a treatment under heating for the purpose of sintering and solubilizing and are then cooled. The R2T17 rare earth permanent magnet having high energy product without degradation in coercive force and residual flux density is obtained. |
