GB743791A - Improvements in or relating to the production of magnetisable powder suitable for the manufacture of permanent magnets - Google Patents

Improvements in or relating to the production of magnetisable powder suitable for the manufacture of permanent magnets

Info

Publication number
GB743791A
GB743791A GB736953A GB736953A GB743791A GB 743791 A GB743791 A GB 743791A GB 736953 A GB736953 A GB 736953A GB 736953 A GB736953 A GB 736953A GB 743791 A GB743791 A GB 743791A
Authority
GB
United Kingdom
Prior art keywords
powder
mixture
zinc
per cent
iron oxide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB736953A
Inventor
William Lamb
Stephen Marriott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NLAANVRAGE8601352,A priority Critical patent/NL185974B/en
Priority to NL89248D priority patent/NL89248C/xx
Application filed by General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB736953A priority patent/GB743791A/en
Publication of GB743791A publication Critical patent/GB743791A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
    • C04B35/2625—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing magnesium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
    • B22F9/22—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds using gaseous reductors

Abstract

Magnetisable powder consisting of particles of mean ultimate crystal size not greater than 1 micron in the greatest dimension is made by forming an intimate mixture of iron oxide, preferably hydrated or anhydrous ferric oxide, with 0,5-5 per cent by weight of one or more of the metals zinc, cadmium, magnesium and aluminium in powder form and heating the mixture in a reducing atmosphere such as hydrogen for 1/2 to 2 1/2 hours in the temperature range 300 DEG -425 DEG C. The powder mixture may contain cobalt and/or nickel added, for example, as their organic salts as disclosed in Specification 743,792. Where zinc is used it may be added as zinc dust. The powder mixture should be agitated during reduction as by passing the reducing gas through the powder. The product being pyrophoric, should be collected in a protective liquid such as benzene or paraffin or in a solution of plastic insulating material, e.g. phenol-aldehyde resin, in acetone. Specification 590,392 also is referred to. The Provisional Specification describes also the addition of powder of calcium, barium and/or strontium to the iron oxide and the addition of powder metal in proportions up to 5 per cent.
GB736953A 1953-03-17 1953-03-17 Improvements in or relating to the production of magnetisable powder suitable for the manufacture of permanent magnets Expired GB743791A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NLAANVRAGE8601352,A NL185974B (en) 1953-03-17 DEVICE FOR SPRAYING GROWING BEDS AND SPRAYING NOZZLE.
NL89248D NL89248C (en) 1953-03-17
GB736953A GB743791A (en) 1953-03-17 1953-03-17 Improvements in or relating to the production of magnetisable powder suitable for the manufacture of permanent magnets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB736953A GB743791A (en) 1953-03-17 1953-03-17 Improvements in or relating to the production of magnetisable powder suitable for the manufacture of permanent magnets

Publications (1)

Publication Number Publication Date
GB743791A true GB743791A (en) 1956-01-25

Family

ID=9831817

Family Applications (1)

Application Number Title Priority Date Filing Date
GB736953A Expired GB743791A (en) 1953-03-17 1953-03-17 Improvements in or relating to the production of magnetisable powder suitable for the manufacture of permanent magnets

Country Status (2)

Country Link
GB (1) GB743791A (en)
NL (2) NL185974B (en)

Also Published As

Publication number Publication date
NL185974B (en)
NL89248C (en)

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