Methods of producing rare earth alloy magnet powder with superio

Details Methods of producing rare earth alloy magnet powder with superio Methods of producing rare earth alloy magnet powder with superio

1997-03-10

1998-12-15

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148101, 148104, H01F 1057

Patent

active

058491090

ABSTRACT:
Methods of producing a rare earth alloy magnet powder having superior magnetic anisotropy and an aggregate of fine recrystallized structure of a R.sub.2 T.sub.14 M type intermetallic compound phase. In the methods, a R--T--M--A--Mg alloy material containing Mg is subjected to the following steps: elevating the temperature of the R--T--M--A--Mg alloy material from room temperature to a temperature up to 500.degree. C. in a vacuum or inert gas atmosphere; hydrogen-occluding treatment in which hydrogen is occluded in the R.ltoreq.T--M--A--Mg alloy material to promote phase transformation by elevating the temperature from room temperature to a predetermined temperature ranging from 500.degree. to 1,000.degree. C. and maintaining the elevated temperature under a hydrogen atmosphere or a mixed gas atmosphere of hydrogen and an inert gas; subsequently dehydrogenating treatment in which hydrogen is forcibly released from the R--T--M--A--Mg alloy material to promote phase transformation by maintaining the R--T--M--A--Mg alloy material at a predetermined temperature ranging from 500.degree. to 1000.degree. C. in a vacuum atmosphere of less than 1 Torr; cooling; and crushing.

REFERENCES:
patent: 4597938 (1986-07-01), Matsuura et al.
patent: 5110374 (1992-05-01), Takeshita et al.
patent: 5352301 (1994-10-01), Panchanathan et al.
patent: 5595608 (1997-01-01), Takebuchi et al.
patent: 5641363 (1997-06-01), Fukuno et al.

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