Doubly-coated iron particles

Details Doubly-coated iron particles Doubly-coated iron particles

1989-06-12

1991-11-05

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

148105, 148257, 252 6254, 264319, 2643281, 26432817, 264DIG58, 427214, 427216, 428407, H01F 106, B29C 4302, B29C 4500

Patent

active

050630113

ABSTRACT:
Methods of doubly coating iron particles. The methods comprise treating the iron particles with phosphoric acid to form a layer of hydrated iron phosphate at the surfaces of the iron particles. The particles are heated in an inert atmosphere at a temperature and for a time sufficient to convert the hydrated layer to an iron phosphate layer. The particles are then coated with a termoplastic material to provide a coating of thermoplastic material substantially uniformly circumferentially surrounding the iron phosphate layer. Doubly-coated iron particles provided in accordance with this invention are generally useful for forming magnetic components and cores for use in high frequency switching applications.

REFERENCES:
patent: 1789477 (1931-01-01), Roseby
patent: 1850181 (1932-03-01), Roseby
patent: 2232352 (1937-04-01), Verweij
patent: 2783208 (1957-02-01), Katz
patent: 3480485 (1969-11-01), Hart et al.
patent: 3933536 (1976-01-01), Doser et al.
patent: 3935340 (1976-01-01), Yamaguchi et al.
patent: 3953251 (1976-04-01), Butherus et al.
patent: 4298405 (1981-11-01), Saus et al.
patent: 4601765 (1986-07-01), Soileau et al.
The Condensed Chemical Dictionary, 10th ed, 1981, pp. 17, 102, 797, 798, 837 & 839.

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