Permanent magnet and its manufacture

Abstract

Abstract PURPOSE:To manufacture a permanent magnet material having excellent performance at low cost by molding and sintering the powder of an alloy consisting basically of Fe, B and rare earth elements having specified composition, and thereafter heat-treating the sintered body. CONSTITUTION:The powder of an alloy consisting of by atomic ratio 8-30% at least one kind of rare earth element containing Y, 2-28% B, 0.1-3% Al and the balance Fe is pressurized and molded in a magnetic field. The molded material is sintered at 900-1,200 deg.C for 0.5-4hr in a reducing or nonoxidizing atmosphere. The sintered body is cooled to room temperature at >=100 deg.C/min cooling rate and furthermore it is subjected to aging treatment in a vacuum or gaseous inactive atmosphere at the temperature within the range of 350 deg.C- the sintering temperature for 5min-40hr. A permanent magnetic material having excellent performance is manufactured at low cost by using abundant Nd, Pr or the like without using scarce rare earth elements such as Sm and also expensive Co.

Inventors

• 👤 Masato Sagawa
• 👤 眞人 佐川
• 👤 Setsuo Fujimura
• 👤 藤村　節夫
• 👤 Yutaka Matsuura
• 👤 裕 松浦
• 👤 Hitoshi Yamamoto
• 👤 日登志 山本

Bibliographic Details