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US 4,601,753 AGranted
Powdered iron core magnetic devices
AssigneeGeneral Electric Company
InventorsTrasimond A. Soileau, Lawrence W. Speaker
Life of this patent
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Abstract
A compacted powdered iron core utilizes iron powder in the 0.002 to 0.006 mean particle size range which is firt coated with an alkali metal silicate and then overcoated with a silicone resin polymer. The treated powder is compressed to approximately 94% of theoretical density and then annealed at approximately 600.degree. C. This results in a core component characterized by overall core losses as low as in conventional laminated cores in A.C. operation.
Claims7
Treated iron powder suitable for compaction, said powder comprising:
- iron powder consisting of iron particles having a coating of an alkali metal silicate and an overcoating of a high temperature polymer selected from the group consisting of silicones, polyimides, fluorocarbons and acrylics, said coating and overcoating being effective for providing insulation between particles.
Dependencies are inferred from the claim text.