GB726264A - Improvements in or relating to the preparation of ferrous powders suitable for the manufacture of permanent magnets - Google Patents

Improvements in or relating to the preparation of ferrous powders suitable for the manufacture of permanent magnets

Info

Publication number
GB726264A
GB726264A GB1302352A GB1302352A GB726264A GB 726264 A GB726264 A GB 726264A GB 1302352 A GB1302352 A GB 1302352A GB 1302352 A GB1302352 A GB 1302352A GB 726264 A GB726264 A GB 726264A
Authority
GB
United Kingdom
Prior art keywords
oxide
iron
heating
alkali metal
carbonate
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
GB1302352A
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 NLAANVRAGE7711818,B priority Critical patent/NL178480B/en
Priority to NL85333D priority patent/NL85333C/xx
Application filed by General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB1302352A priority patent/GB726264A/en
Priority to FR1076496D priority patent/FR1076496A/en
Priority to DES33461A priority patent/DE1031771B/en
Publication of GB726264A publication Critical patent/GB726264A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/065—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder obtained by a reduction

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

Iron oxide, hydrated iron oxide, or other iron compound yielding an oxide on heating is heated with an alkaline earth metal compound and an alkali metal oxide, hydroxide, or carbonate, the atomic ratio of iron to alkaline earth metal being not less than 9:1 and the heating is carried out at a temperature at which alkali metal ferrite is formed, for example 500-800 DEG C. It is stated that when this alkali metal ferrite is treated with water it is hydrolized with the liberation of an iron oxide, more or less hydrated, which has not been subjected to a high temperature and can be reduced at a much lower temperature than can an oxide which has been heated to a high temperature.ALSO:Magnetizable ferrous powder of particle size not greater than 5000 Angstrom units is made by heating a mixture of iron oxide, or hydrated iron oxide, or other iron compound which yields an oxide on heating, with an alkaline earth metal compound and an alkali metal oxide, hydroxide, or carbonate, the atomic ratio of iron to alkaline earth metal being not less than 9 : 1 and the heating being carried out at a temperature at which alkali metal ferrite is formed, treating the product with water, remvoing the aqueous solution formed, and heating the residue at a temperature below 500 DEG C. in a reducing atmosphere to reduce the iron to the metallic state. The alkaline earth metal compound may be the oxide, hydroxide, formate, oxalate or carbonate of calcium, barium, or strontium and the alkali metal compound may be the hydroxide or carbonate of sodium or potassium. The heating may be carried out at 500-800 DEG C. to maintain the product in a liquid or semi-liquid state when using an alkali metal hydroxide or at 700-800 to produce a sintered mass when using an alkali metal carbonate and may be in an atmosphere of oxygen-free nitrogen. The final heating at 250-500 DEG C. may be in an atmosphere of hydrogen flowing at the rate of at least 300 litres per hour for every 10-15 grams of solid. Ferro-magnetic oxid materials other than iron which are decomposed or reduced to the metal may be added to the mixture.
GB1302352A 1952-05-22 1952-05-22 Improvements in or relating to the preparation of ferrous powders suitable for the manufacture of permanent magnets Expired GB726264A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NLAANVRAGE7711818,B NL178480B (en) 1952-05-22 DRILL BELT, ESPECIALLY FOR CARPETS OR FELTY JOBS.
NL85333D NL85333C (en) 1952-05-22
GB1302352A GB726264A (en) 1952-05-22 1952-05-22 Improvements in or relating to the preparation of ferrous powders suitable for the manufacture of permanent magnets
FR1076496D FR1076496A (en) 1952-05-22 1953-04-27 Process for manufacturing magnetizable iron powders and magnets obtained from these powders
DES33461A DE1031771B (en) 1952-05-22 1953-05-18 Process for the production of iron powders consisting essentially of metallic iron particles, which are suitable for the production of permanent magnets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1302352A GB726264A (en) 1952-05-22 1952-05-22 Improvements in or relating to the preparation of ferrous powders suitable for the manufacture of permanent magnets

Publications (1)

Publication Number Publication Date
GB726264A true GB726264A (en) 1955-03-16

Family

ID=10015397

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1302352A Expired GB726264A (en) 1952-05-22 1952-05-22 Improvements in or relating to the preparation of ferrous powders suitable for the manufacture of permanent magnets

Country Status (4)

Country Link
DE (1) DE1031771B (en)
FR (1) FR1076496A (en)
GB (1) GB726264A (en)
NL (2) NL85333C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879154A (en) * 1956-10-02 1959-03-24 Franklin Inst Of The State Of Acicular metal particles and method of making the same
US11607734B2 (en) 2018-05-30 2023-03-21 Hela Novel Metals Llc Methods for the production of fine metal powders from metal compounds

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2935394A (en) * 1956-04-16 1960-05-03 Commw Engineering Corp Method and apparatus for producing micron and sub-micron metals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879154A (en) * 1956-10-02 1959-03-24 Franklin Inst Of The State Of Acicular metal particles and method of making the same
US11607734B2 (en) 2018-05-30 2023-03-21 Hela Novel Metals Llc Methods for the production of fine metal powders from metal compounds

Also Published As

Publication number Publication date
NL178480B (en)
FR1076496A (en) 1954-10-27
DE1031771B (en) 1958-06-12
NL85333C (en)

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