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GB997248A - Iron powder and magnetic cores made therefrom - Google Patents

Iron powder and magnetic cores made therefrom

Info

Publication number
GB997248A
GB997248A GB8977/63A GB897763A GB997248A GB 997248 A GB997248 A GB 997248A GB 8977/63 A GB8977/63 A GB 8977/63A GB 897763 A GB897763 A GB 897763A GB 997248 A GB997248 A GB 997248A
Authority
GB
United Kingdom
Prior art keywords
powder
iron powder
magnetic cores
made therefrom
cores made
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
GB8977/63A
Inventor
Thornley Athelston Dunton
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.)
Inco Ltd
Original Assignee
Inco Ltd
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
Application filed by Inco Ltd filed Critical Inco Ltd
Priority to GB8977/63A priority Critical patent/GB997248A/en
Priority to US346622A priority patent/US3348982A/en
Publication of GB997248A publication Critical patent/GB997248A/en
Priority to US642564A priority patent/US3384589A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0292—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with more than 5% preformed carbides, nitrides or borides
    • 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
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/14—Treatment of metallic powder
    • B22F1/145—Chemical treatment, e.g. passivation or decarburisation
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

The temperature coefficient of permeability of carbonyl-iron powder is reduced by nitriding the powder until the combined nitrogen and carbon content lies within the range 9-10.5% by weight. The process is preferably applied to powder initially containing 0.5-2.5% of carbon and 0.4-2.6% of nitrogen, and may consist of heating the powder in a rapid flow of ammonia for 4-6 hours at 450 DEG C. The treated powder may be mixed with a suitable proportion of untreated powder to yield a product having intermediate values of coefficient of permeability.
GB8977/63A 1963-03-06 1963-03-06 Iron powder and magnetic cores made therefrom Expired GB997248A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB8977/63A GB997248A (en) 1963-03-06 1963-03-06 Iron powder and magnetic cores made therefrom
US346622A US3348982A (en) 1963-03-06 1964-02-24 Iron powder and core with controlled permeability coefficient
US642564A US3384589A (en) 1963-03-06 1967-05-31 Nitrided iron powder core with controlled permeability coefficient

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8977/63A GB997248A (en) 1963-03-06 1963-03-06 Iron powder and magnetic cores made therefrom

Publications (1)

Publication Number Publication Date
GB997248A true GB997248A (en) 1965-07-07

Family

ID=9862969

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8977/63A Expired GB997248A (en) 1963-03-06 1963-03-06 Iron powder and magnetic cores made therefrom

Country Status (2)

Country Link
US (1) US3348982A (en)
GB (1) GB997248A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3502446A (en) * 1964-10-08 1970-03-24 Metal Innovations Inc Production of powder,strip and other metal products from refined molten metal
US3904448A (en) * 1973-01-04 1975-09-09 Victor Company Of Japan Method for preparing magnetic alloy powder by surface nitriding
US3953251A (en) * 1974-03-25 1976-04-27 Bell Telephone Laboratories, Incorporated Method for the production of carbonyl iron containing magnetic devices with selected temperature variation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2666724A (en) * 1952-12-03 1954-01-19 Gen Aniline & Film Corp Process of preparing iron powder of improved electromagnetic properties
US2812276A (en) * 1953-06-29 1957-11-05 Int Nickel Co High frequency cores
DE1178219B (en) * 1962-02-13 1964-09-17 Degussa Iron nitride carbide powder and process for its manufacture

Also Published As

Publication number Publication date
US3348982A (en) 1967-10-24

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