Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1975-04-24
1977-09-13
Cooper, Jack
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
75211, 75224, 252 6255, H01F 114
Patent
active
040479838
ABSTRACT:
A method for producing a soft magnetic material consisting essentially of up to 0.05% carbon, up to 1.0% manganese, up to 0.05% sulfur, up to 0.5% silicon, from 0.5 to 1.5% phosphorus, balance iron and residuals. The method comprises the steps of: blending iron powder and phosphorus-bearing powder into a mixture containing from 0.5 to 1.5% phosphorus; pressing the blended mixture; and sintering the mixture in a non-oxidizing atmosphere at a temperature and for a period of time sufficient to produce a density of at least 7 grams per cubic centimeter. The sintering temperature is at least 2200.degree. F. The soft magnetic material is characterized by a magnetizing force to reach 10 kilogauss of no more than 2.0 oersteds, and a coercive force from 10 kilogauss of no more than 0.9 oersted.
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patent: 3120698 (1964-02-01), Elliot
patent: 3497347 (1970-02-01), Dautzenberg et al.
Panasyuk et al., "Chem. Abstracts," vol. 79, 1973, p. 24909k.
Bol'shechenko et al., "Chem. Abstracts," vol. 79, 1973, p. 34095f.
Falkowski Edward C.
Ruppel Carl E.
Allegheny Ludlum Industries, Inc.
Cooper Jack
Dropkin Robert F.
Gioia Vincent G.
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