Alloy ingot for permanent magnet, anisotropic powders for perman

Details Alloy ingot for permanent magnet, anisotropic powders for perman Alloy ingot for permanent magnet, anisotropic powders for perman

1996-04-19

1997-10-07

Sheehan, John

Metal treatment

Stock

Magnetic

148301, 148303, 420 83, 420121, H01F 1057

Patent

active

056743270

ABSTRACT:
An alloy ingot for permanent magnet consists essentially of rare earth metal and iron and optionally boron. The two-component alloy ingot contains 90 vol % or more of crystals having a crystal grain size along a short axis of 0.1 to 100 .mu.m and that along a long axis of 0.1 to 100 .mu.m. The three-component alloy ingot contains 90 vol % or more of crystals having a crystal grain size along a short axis of 0.1 to 50 .mu.m and that along a long axis of 0.1 to 100 .mu.m. The alloy ingot is produced by solidifying the molten alloy uniformly at a cooling rate of 10.degree. to 1000.degree. C./sec. at a sub-cooling degree of 10.degree. to 500.degree. C. A permanent magnet and anisotropic powders are produced from the alloy ingot.

REFERENCES:
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patent: 4921551 (1990-05-01), Vernia et al.
patent: 4981532 (1991-01-01), Takeshita et al.
patent: 5067551 (1991-11-01), Murakami et al.
patent: 5172751 (1992-12-01), Croat

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