| 摘要 |
PURPOSE:To obtain the maximum energy product by a method wherein a multistage aging treatment is repeated a plurality of times in the process wherein the alloy, which is adjusted in such a manner that it is composed of R at 23.0-25.5wt%, Cu at 3.0-5.0wt%, Zr at 2.0-5.0wt% and Co for the remainder, is brought into the state of magnet. CONSTITUTION:A sintering process is applied to the material consisting of R (R is at least a kind of rare-earth element) at 23-25% in percentage by weight, Cu at 4.0-5.0%, Fe at 13-15%, Zr at 1.5-4.0%, and Co at the remaining percentage, and after said sintering process is finished, a multistage aging treatment is repeated twice or more at the temperature range of 400-850 deg.C. As a result, the magnet having high coercive force and a high energy product can be obtained. |
