Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1993-09-17
1996-10-08
Kiliman, Leszek
Stock material or miscellaneous articles
Composite
Of inorganic material
428403, 428407, 428634BA, 428694B, 428900, 264126, 264319, 2643281, 26432817, 148105, 148104, 252 6254, 427214, 427216, G11B 566
Patent
active
055630014
ABSTRACT:
A polymeric coating material is provided for coating powdered materials, and more particularly, for coating powdered metals which are compression molded to form magnetic cores. The preferred polymeric materials are polybenzimidazole, an aromatic polyamide such as polyphthalamide, and appropriate polyimides which, when properly applied to metal particles to form a magnetic core, are characterized as having a sufficiently high heat deflection temperature of at least about 270.degree. C., so as to prevent the degradation of the mechanical and magnetic properties of the magnetic core at exposure at elevated temperatures. Each of these preferred coating materials is characterized by excellent mechanical properties, chemical resistance and dielectric characteristics within this temperature range.
REFERENCES:
patent: 4601765 (1986-07-01), Soileau et al.
patent: 4713288 (1987-12-01), Kokaku et al.
patent: 4725490 (1988-02-01), Goldberg
patent: 5098940 (1992-03-01), Brooks
patent: 5211896 (1993-05-01), Ward
patent: 5271891 (1993-12-01), Gay
General Motors Corporation
Kiliman Leszek
Plant Lawrence B.
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