Composition for producing soft magnetic composites by powder metallurgy
AssigneeHöganäs AB
InventorsLisa Kjellen, Asa Ahlin, Lars Hultman, Ola Andersson
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Abstract
The invention concerns powder compositions consisting of electrically insulated particles of a soft magnetic material of an iron or iron-based powder and 0.1-2% by weight of a lubricant selected from the group consisting of fatty acid amides having 14-22 C atoms. Optionally a thermoplastic binder such as polyphenylene sulphide may be included in the composition. The invention also concerns a method for the preparation of soft magnetic composite components.
Claims21
1-11. (canceled)
A method for making soft magnetic components comprising the steps of:
- (a) mixing a soft magnetic iron or iron-based powder, wherein the particles are surrounded by an electrically insulating layer, and up to 2% by weight of a lubricant selected from the group comprising primary amides of saturated or unsaturated, straight fatty acid having 12-24 C atoms,
- (b) compacting the composition, and
- (c) optionally subjecting the obtained component to heat treatment.
A soft magnetic composite component obtained by compacting a composition comprising an iron-based insulated powder and a lubricant, followed by heat treatment of the compacted component, having;
- a density ≧7.5 g/cm3,
- a maximum relative permeability, μmax ≧600,
- a coercive force, Hc≦250 A/m, and
- a specific resistivity, ρ≧20 μΩm.
A soft magnetic composite component according to claim having a specific resistivity, ρ≧100 μΩm.
Dependencies are inferred from the claim text.