Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1995-11-24
1997-01-21
Wyszomierski, George
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148105, 419 10, 419 29, 419 35, H01F 126
Patent
active
055956092
ABSTRACT:
A method for stress relieving a compression molded magnetic body is provided for purposes of enhancing the magnetic permeability of the magnetic body. The method involves encapsulating ferromagnetic particles with a thermoplastic polymer coating selected from the group consisting of polybenzimidazole and polyimides having heat deflection temperatures of at least about 400.degree. C. which are capable of withstanding elevated temperatures for a duration which is sufficient to anneal the magnetic body formed from the coated metal particles. As a result, the stresses induced in the magnetic core by the compression molding process can be relieved without detriment to the mechanical properties and magnetic characteristics of the magnetic core.
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General Motors Corporation
Plant Lawrence B.
Wyszomierski George
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