| 摘要 |
PURPOSE:To obtain a large size anisotropic permanent magnet by warm setting process using raw material obtained by roughly milling thin plates of rapidly solidified R2Fe14B alloy (R is a rare earth element including Y). CONSTITUTION:A rare earth permanent magnet obtained by the warm process has the main phase of R2Fe14B (R is a rare earth element including Y), the maximum energy product of 30MGOe or more and weight of 500g or more. This rare earth magnet uses thin plates of rapidly solidified material manufactured by a single roll method under inactive atmosphere and is formed by roughly milling these thin plates into the particles having grain size of 300mum or less and then forming a mold of such particle with a press under the normal temperature. Thereafter, the formed material is densed in the temperature range of about 700 deg.C and is then set also in the temperature range of about 8700 deg.C. Thereby, an integrated and heavy weight anisotropic permanent magnet having no magnetic gap can be obtained. |
