PROCESS FOR PRODUCING PERMANENT MAGNETS

This process for producing improved permanent magnets comprises the following steps (1) a permanent magnet alloy is pulverised. The alloy is represented by the fomula R(T,M)z where R is a rare earth metal or a mixture of more than one rare earth metal, T is a mixture of transition metals composed ma...

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Bibliographic Details
Main Author IMAIZUMI, NOBUO
Format Patent
LanguageEnglish
Published 01.04.1992
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:This process for producing improved permanent magnets comprises the following steps (1) a permanent magnet alloy is pulverised. The alloy is represented by the fomula R(T,M)z where R is a rare earth metal or a mixture of more than one rare earth metal, T is a mixture of transition metals composed mainly of Fe and Co. M is a mixture of metalloid elements the main component of which is B, and z=4-9. (2) the pulverised product is oriented-compression-moulded in a magnetic field or compression-moulded in a non-magnetic field, and then (3) sintered at 900 to 1200 deg.C, (4) the product is then ground and polished into a suitable shape (5) following by solution heat treatment at 900 to 1200 deg.C at a pressure of 10 power (01) -1 Torr oxygen and/or nitrogen; (6) and then aged at 300 to 900 deg.C. Process (4) and (5) can be exchanged. As a result of these processes an oxide and/or nitride film of thickness 0.001-0.1 microns is formed on the surface of the magnet.
Bibliography:Application Number: EP19860904351