PO COMPOSITO FERROSO CONTENDO ESTANHO,PROCESSO PARA SUA PRODUCAO E MATERIAL MAGNETICO SINTERIZADO FERROSO

As the raw material of a ferrous sintered alloy, a ferrous composite powder excellent in both compressibility and distribution of alloying elements is obtained by mixing an iron powder or a Sn-free low-alloy iron powder with at least one secondary powder comprising at least one of C, Co, Cr, Cu, Mn,...

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Bibliographic Details
Main Author SHIGEAKI TAKAJO
Format Patent
LanguagePortuguese
Published 25.02.1986
Edition4
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:As the raw material of a ferrous sintered alloy, a ferrous composite powder excellent in both compressibility and distribution of alloying elements is obtained by mixing an iron powder or a Sn-free low-alloy iron powder with at least one secondary powder comprising at least one of C, Co, Cr, Cu, Mn, Mo, Ni, P and Si and another powder comprising Sn and heating the powder mixture in a nonoxidizing atmosphere at 250-900°C to result in that the secondary powder(s) is at least partially bonded to the iron particles with Sn as a sort of cementing medium. In the powder mixture the content of Sn is 0.1-20 wt%, and the weight ratio of the secondary powder(s) to Sn is not greater than 50:1. Also disclosed is a ferrous sintered magnetic material high in magnetic flux density and small in iron loss, which contains 1-12 wt% of Si, 0.05-7 wt% of Sn and, optionally, 0.05-2 wt% of P and in which Sn concentrates on the surfaces of iron particles.
Bibliography:Application Number: BR19858502886