Process for producing alloy powder material for R-Fe-B permanent

Details Process for producing alloy powder material for R-Fe-B permanent Process for producing alloy powder material for R-Fe-B permanent

1993-03-17

1995-02-07

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148105, H01F 102

Patent

active

053872916

ABSTRACT:
A process for producing a starting powder material for use in the fabrication of high performance R--Fe--B permanent magnets comprising an R.sub.2 Fe.sub.14 B compound as the principal phase, which is characterized by adding 70% by weight or less of a specified alloy powder for adjusting the composition comprising an R.sub.2 Fe.sub.17 compound to a specified principal phase R--Fe--B alloy powder comprising an R.sub.2 Fe.sub.14 B compound as the principal phase. This process enables production of a starting alloy powder material considerably reduced in contents of the unfavorable B-rich and R-rich phases which impair the magnetic properties of the final magnet, because the starting powder blend allows the B-rich and R-rich compounds in the principal phase alloy powder to react with the R.sub.2 Fe.sub.17 compound being incorporated in the alloy powder for adjusting the composition.

REFERENCES:
patent: 4975213 (1990-12-01), Sakai et al.
patent: 5011552 (1991-04-01), Otsuka et al.
patent: 5049203 (1991-09-01), Mukai et al.

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