Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1997-10-08
2000-05-02
Sheehan, John
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148101, H01F 1057
Patent
active
060568305
ABSTRACT:
A rare earth permanent magnet powder having high anisotropy, that means Br/Bs of more than 0.65, is produced by applying present invented hydrogen heat treatment. The rare earth permanent magnet powder consists essentially of rare earth element including yttrium, iron, and boron. It is subjected to hydrogen heat treatment accompanied with phase transformations. The treatment is carried out at the relative reaction rate within the range of 0.25-0.50 at 830.degree. C. and hydrogen pressure of 0.1 MPa. Here the relative reaction rate is defined as the ratio of actual reaction rate to the standard reaction rate which measured at the temperature of 830.degree. C. and hydrogen pressure of 0.1 MPa.
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Honkura Yoshinobu
Mishima Chisato
Mitarai Hironari
Aichi Steel Works Ltd.
Sheehan John
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