Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1974-11-04
1976-10-05
Satterfield, Walter R.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
75170, 148 3155, 148121, H01F 100
Patent
active
039839168
ABSTRACT:
A semi-hard magnetic material characterized by a high coercive force (Hc), i.e. 20-50 Oe, can be produced by the disclosed process.
In accordance with the process, an alloy consisting of 73 to 93% Co and 3 to 7% Nb, and the balance being iron is worked into a suitable form, solution treated, cold worked at a reduction of area not lower than 75% and aged. Said alloy contains niobium in a greater amount than the known alloy for the same application in order to enhance the coercive force. With the increase in the content of niobium, however, the cold workability of the alloy deteriorates. In order to overcome this disadvantage, the Inventors provide particular conditions for the solution treatment. The solution treatment consists of heating the alloy to a temperature not lower than 1000.degree.C and cooling it to room temperature. During the cooling, quenching of the alloy should be started at 800.degree.C or higher and continued to a temperature of 500.degree.C or less.
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Hanada Etsuo
Henmi Zenzo
Kassai Makoto
Kobayashi Toshio
Okada Masanori
Fujitsu Ltd.
Satterfield Walter R.
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