COMPOSITE SOFT MAGNETIC POWDER, METHOD FOR PRODUCING SAME, AND POWDER MAGNETIC CORE USING SAME

A composite, soft-magnetic powder comprising soft-magnetic, iron-based core particles having an average particle size of 2-100 µm, and boron nitride-based coating layers each covering at least part of each soft-magnetic, iron-based core particle, said coating layers being polycrystalline layers comp...

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Bibliographic Details
Main Authors TOKORO, HISATO, KURITA, FUMI
Format Patent
LanguageEnglish
French
German
Published 24.12.2014
Subjects
ALLOYS
BASIC ELECTRIC ELEMENTS
CASTING
CHEMISTRY
ELECTRICITY
FERROUS OR NON-FERROUS ALLOYS
INDUCTANCES
MAGNETS
MAKING METALLIC POWDER
MANUFACTURE OF ARTICLES FROM METALLIC POWDER
METALLURGY
PERFORMING OPERATIONS
POWDER METALLURGY
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TRANSFORMERS
TRANSPORTING
TREATMENT OF ALLOYS OR NON-FERROUS METALS
WORKING METALLIC POWDER
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Summary:A composite, soft-magnetic powder comprising soft-magnetic, iron-based core particles having an average particle size of 2-100 µm, and boron nitride-based coating layers each covering at least part of each soft-magnetic, iron-based core particle, said coating layers being polycrystalline layers comprising fine boron nitride crystal grains having different crystal orientations and an average crystal grain size of 3-15 nm, the average thickness of said polycrystalline layers being 6.6% or less of the average particle size of said soft-magnetic, iron-based core particles, is produced by (1) mixing iron nitride powder having an average particle size of 2-100 µm with boron powder having an average particle size of 0.1-10 µm, (2) heat-treating the resultant mixed powder at a temperature of 600-850°C in a nitrogen atmosphere, and (3) removing non-magnetic components.
Bibliography:Application Number: EP20120764401