GB1210332A - Improvements in permanent magnet material powders having superior magnetic characteristics and method of making them - Google Patents

Improvements in permanent magnet material powders having superior magnetic characteristics and method of making them

Info

Publication number
GB1210332A
GB1210332A GB579/69A GB57969A GB1210332A GB 1210332 A GB1210332 A GB 1210332A GB 579/69 A GB579/69 A GB 579/69A GB 57969 A GB57969 A GB 57969A GB 1210332 A GB1210332 A GB 1210332A
Authority
GB
United Kingdom
Prior art keywords
rare earth
jan
cobalt
seconds
particles
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
GB579/69A
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
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of GB1210332A publication Critical patent/GB1210332A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F3/00—Brightening metals by chemical means
    • C23F3/04—Heavy metals
    • C23F3/06—Heavy metals with acidic solutions
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/07—Alloys based on nickel or cobalt based on cobalt
    • 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

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)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

1,210,332. Cobalt-rare earth compounds. GENERAL ELECTRIC CO. 3 Jan., 1969 [31 Jan., 1968], No. 579/69. Heading C1A. [Also in Divisions C7 and H1] Particles of cobalt-rare earth intermetallic compound Co 5 R (where R is a rare earth metal, e.g. Y, Sm or Ce-rich mischmetal) made by grinding a bulk body of the compound, are chemically polished by contact with an acid solution. The coercive force of the magnetic material is thereby increased. Specified acid solutions contain (1) nitric, sulphuric, orthophosphoric and glacial acetic acids; (2) chromic oxide, nitric acid, sodium sulphate and water. Contact time may be 1 or 2 seconds to 30 minutes. In an example, Co 5 Y particles (about 44-60 microns) are contacted at 25‹ C. for 30 seconds with acid solution (1), rinsed in water and acetone and dried. The coercive force of the product, measured on a sample cooled in molten paraffin wax in an aligning magnetic field, is 3340 oersteds.
GB579/69A 1968-01-31 1969-01-03 Improvements in permanent magnet material powders having superior magnetic characteristics and method of making them Expired GB1210332A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US70184068A 1968-01-31 1968-01-31

Publications (1)

Publication Number Publication Date
GB1210332A true GB1210332A (en) 1970-10-28

Family

ID=24818894

Family Applications (1)

Application Number Title Priority Date Filing Date
GB579/69A Expired GB1210332A (en) 1968-01-31 1969-01-03 Improvements in permanent magnet material powders having superior magnetic characteristics and method of making them

Country Status (7)

Country Link
US (1) US3558372A (en)
BE (1) BE726341A (en)
DE (1) DE1901056A1 (en)
ES (1) ES362575A1 (en)
FR (1) FR2001038A1 (en)
GB (1) GB1210332A (en)
NL (1) NL6900668A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2054929A1 (en) * 1970-11-07 1972-05-10 Elektro Physik Hans Nix U Dr I Magnetic thickness gauge
US3900749A (en) * 1974-04-02 1975-08-19 Hmw Industries Permanent magnet generator
US5186765A (en) * 1989-07-31 1993-02-16 Kabushiki Kaisha Toshiba Cold accumulating material and method of manufacturing the same
US6966953B2 (en) * 2002-04-29 2005-11-22 University Of Dayton Modified sintered RE-Fe-B-type, rare earth permanent magnets with improved toughness
US6994755B2 (en) * 2002-04-29 2006-02-07 University Of Dayton Method of improving toughness of sintered RE-Fe-B-type, rare earth permanent magnets
US20060054245A1 (en) * 2003-12-31 2006-03-16 Shiqiang Liu Nanocomposite permanent magnets
CA2571401A1 (en) * 2004-06-30 2006-01-12 University Of Dayton Anisotropic nanocomposite rare earth permanent magnets and method of making

Also Published As

Publication number Publication date
FR2001038A1 (en) 1969-09-19
DE1901056A1 (en) 1969-08-28
ES362575A1 (en) 1970-11-01
US3558372A (en) 1971-01-26
NL6900668A (en) 1969-08-04
BE726341A (en) 1969-05-29

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed