| 摘要 |
PURPOSE:To obtain a permanent magnet which assures excellent magnetic characteristics and wide range of application, even with reduced amount of expensive Co, by adding Zr or Hf of the predetermined amount to the R-Fe system magnetic material. CONSTITUTION:A rare earth permanent magnet can be obtained by melting, casting, milling, molding and sintering a composition consisting of at least one or more kinds of rare earth element R including Y of 12-45% in the weight percentage, the element M of 0.5-25%, Fe as the remainder or a combination of Fe and Co and impurity as the essential element. The element defined by R is the rare earth elements consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu adding Y. These elements are used individually or in combination of two or more kinds. Thereby, the rare earth permanent magnet is stabilized in the 3-element system compound phase through introduction of Zr, Hf, or both of them and the Curie point and saturated magnetization are improved. Thereby, high magnetic characteristic can be attained and a part of Zr or Hf can be replaced with Ti. |
