Production of permanent magnet mode of rare earth metal-containing alloy

Abstract

Abstract PURPOSE:To produce a permanent magnet made of rare earth metal contg. alloy having excellent magnetic characteristic by compacting green powder after imparting to the alloy powder containing rare earth metal having strong magnetic anisotropy, uniaxial magnetic anisotropy and executing heat treatment and magnetization after sintering. CONSTITUTION:The rare earth element contg. alloy of Nb-Fe-B alloy, etc., having strong magnetic anisotropy is melted by vacuum arc melting method. Next, the molten alloy is made to about <=5mum of the powder by atomizing method, etc., under non-oxidizing atmosphere. The above alloy powder 1 obtd. by this method is packed in a compacting vessel 2 made of elastic material of rubber, etc. This is put in the magnetic field generated by a field coil 3 and uniaxial magnetic anisotropy is imparted thereto by the field H. Successively, the above powder 1 together with the compacting vessel 2 is compacted by cold static hydraulic pressing method at 0.8-2.0 ton/cm<2> compacting pressure. The green compact obtd. by this method is sintered at about 1000-1100 deg.C. Successively, after executing the ageing heat treatment to the sintered product at about 400-600 deg.C, it is magnetized by the magnetic field of about >=14 KOe.

Inventors

• 👤 Mitsuru Noguchi
• 👤 満 野口
• 👤 Naomasa Kimura
• 👤 直正 木村

Bibliographic Details