Columnar crystal permanent magnet and method of preparation

Details Columnar crystal permanent magnet and method of preparation Columnar crystal permanent magnet and method of preparation

1983-11-30

1985-08-20

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148103, 148104, 148 3157, H01F 102

Patent

active

045362335

ABSTRACT:
A permanent magnet formed from a powdered alloy ingot of samarium (Sm) and cobalt (Co), copper (Cu), and iron (Fe) and at least one element selected from the group consisting of zirconium (Zr), titanium (Ti), hafnium (Hf), tantalum (Ta), niobium (Nb), and vanadium (V), formed predominantly of Sm.sub.2 Co.sub.17 crystals and having at least 50 volume percent columnar crystals in the macrostructure is provided. The alloy ingots having increased columnar crystals are prepared by melting the alloy composition at a temperature at least about 320.degree. C. above the melting point of the composition and casting the ingot at a casting speed faster than about 5.0 sec/kg of alloy.

REFERENCES:
patent: 3546030 (1970-12-01), Buschow
patent: 3560200 (1971-02-01), Nesbitt et al.
patent: 3811962 (1974-05-01), Benz
patent: 3816189 (1974-06-01), Haberer et al.
patent: 3998669 (1976-12-01), Strnat
patent: 4131495 (1978-12-01), Menth et al.
patent: 4135953 (1979-01-01), Nagel et al.
patent: 4213803 (1980-07-01), Yoneyama et al.
patent: 4289549 (1981-09-01), Kasai

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