Powder mixture for use in compaction to produce rare earth iron

Details Powder mixture for use in compaction to produce rare earth iron Powder mixture for use in compaction to produce rare earth iron

1995-05-09

1996-06-18

Jordan, Charles T.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Consolidation of powder prior to sintering

419 10, 419 12, 419 39, 419 53, B22F 312

Patent

active

055275044

ABSTRACT:
To a fine R-Fe-B alloy powder comprised predominantly of 10-30 atomic % of R (wherein R stands for at least one elements selected from rare earth elements including yttrium), 2-28 atomic % of B, and 65-82 atomic % of Fe in which up to 50 atomic % of Fe may be replaced by Co, at least one boric acid ester compound such as tributyl borate is added as a lubricant in a proportion of 0.01%-2% by weight and mixed uniformly before, during, or after fine grinding of the alloy powder. The resulting powder mixture is compacted by compression molding in a magnetic field and the green compacts are sintered and aged. Compression molding can be performed continuously without need of mold lubrication, and the resulting magnets have improved magnet properties with respect to residual flux density, maximum energy product, and intrinsic coercive force.

REFERENCES:
patent: Re34838 (1995-01-01), Mohri et al.
patent: 4264361 (1981-04-01), Yajima et al.
patent: 4597738 (1986-07-01), Matsuura et al.
patent: 4770273 (1988-09-01), Sagawa et al.
patent: 5380179 (1995-01-01), Nishimura et al.
patent: 5393445 (1995-02-01), Furuya et al.
patent: 5427734 (1995-06-01), Yamashita et al.

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