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

1993-02-12

1995-01-24

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148541, 148545, 164463, 164477, H01F 102

Patent

active

053839781

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:
patent: 4496395 (1985-01-01), Croat
patent: 4536233 (1985-08-01), Okonogi et al.
patent: 4921551 (1990-05-01), Vernia et al.
patent: 5067551 (1991-11-01), Murakami et al.
patent: 5172751 (1992-12-01), Croat

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