IL39014A - Ferromagnetic acicular cobalt particles their preparation and use - Google Patents

Ferromagnetic acicular cobalt particles their preparation and use

Info

Publication number
IL39014A
IL39014A IL39014A IL3901472A IL39014A IL 39014 A IL39014 A IL 39014A IL 39014 A IL39014 A IL 39014A IL 3901472 A IL3901472 A IL 3901472A IL 39014 A IL39014 A IL 39014A
Authority
IL
Israel
Prior art keywords
particles
preparing
oxalate
organic
metal
Prior art date
Application number
IL39014A
Other versions
IL39014A0 (en
Original Assignee
Graham Magnetics Inc
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 Graham Magnetics Inc filed Critical Graham Magnetics Inc
Publication of IL39014A0 publication Critical patent/IL39014A0/en
Publication of IL39014A publication Critical patent/IL39014A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0433—Nickel- or cobalt-based alloys
    • 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
    • B22F1/16—Metallic particles coated with a non-metal
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70605—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material metals or alloys
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70605—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material metals or alloys
    • G11B5/70621—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material metals or alloys containing Co metal or alloys
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/714—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the dimension of the magnetic particles
    • 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
    • H01F1/061—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 with a protective layer
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
    • Y10T428/2998—Coated including synthetic resin or polymer

Landscapes

  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Hard Magnetic Materials (AREA)
  • Magnetic Record Carriers (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Claims (1)

1. A process for preparing acieular particles the stops of providing acieular cob containing decornpocable salt coating the particles vith an organic reducing the particles to metal at a ure sufficient to d compose coated particles but insufficient to sinter them the organic conpound on the long enough to keep the particles separated to cooling particles while maintaining them in a oxidizing A process according to Claim 1 the organic compound is a equal to about 1 to about weight of the and wherein the polymer liquifies during the oxalate decomposition and during the course of the decomposition the 7 The process according to Claim the oxalate is a wherein the reduction of the carried out The process according to Claim 1 the organic compound largely decomposes under the heat of reducti The process according to 1 and including the addi stop of the s in a suitable solvent to any residual coating from The according to Clnin 1 the taining salt is an The process according to Claim 1 in vhich the is selected from consisting of epoxy resin acrylic silicone and silicone The according to Claim 1 the steps o preparing a first reacting oxali acid with first precipitate to obtain a second precipitate cobalt oxalate subsequently heating the oxalate crystals to a temperature of from to in a reducing atmosphere so as to form acicular me maintaining the particles separate from one another during their reduction by an organic separating medium which separates the particles during reduction yet stantially removed by the heat of to prevont particle cooling the metal particles in an to below sintering temperature and controlled oxidizing the metal particles until oxide Burface coatings form on the particles vhich stabilize The process for preparing particles according to Claim 1 the separating medium an organic The process of preparing small acicular with first precipitate a highly insoluble second precipitate consisting of acicular salt particles of said salt particles in an organic separation prior to the and particles in the until the reduction of the is completed and the particles have cooled below their sintering The process according to 12 wherein at least the second precipitation is from an aqueous solution containing one or alcohol and The process of particles according to Claim 13 wherein the solution is alcohol and The process of preparing particles according to Claia 14 wherein the salt is an The process of preparing panicles according Claim 15 wherein the salt is The process of preparing particles according to Clai 16 wherein the first precipitate is a containing hydroxide or carbonate and the eecond precipitation is carried out in a solution including oxalic The process according to Claim 17 wherein organic compound is a polymeric compound to about 1 to about by weight of said oxalate and wherein the polymer liquifies daring the oxalate decomposition of the The process according to Claim 1 oxalate is a wherein the reduction of the metal is carried out until the s uareness of the metal reaches at 4 reaches at least and until the polymeric compounds has been degraded to equal from about 3 to of its orginal coating The process Claim 17 wherein the polymeric compound is a The process of preparing particles according to Claim 12 wherein the separation an organic compound which is removed by the heat of reduction but whose residues provide the desired The process of preparing particles according Claim 12 and including the additional step subsequently washing away the medium or residues with a suitable The process of preparing particles according to Claim 12 including the additional step of controlledly oxidizing the metal particles 80 as to form oxide surface coatings which stabilize The process of particles according to Claim 12 wherein the reduction step is carried out at a to The process of preparing particles according to Claim 12 where the separation medium is at least one compound selected from the group consisting of polyurethane polyacrylic silicone polymer 6 Particles formed according to the process of Claim 23 comprising a cobalt oxide coating thereover which form3 means to stabilize the particles against further Particles formed according to the process of Claim having a metal content 60 to cobalt and 15 to Particles according to an oil absorption in of to cc per gram of A magnetic recording member comprising a carrier formed of a material having bonded thereto the powder according to any of Claims and a binder A dry composition to any of Claims for use in the preparing of particles arid powder consisting essentially of acicular particles of metal oxalate crystals of at least an average and from to by weight of a polymeric resin intimately associately and forming a coating over the oxalate A according to Claim 30 the organic solid thermally resin on being heated to about in a atmosphere will a liquid in the course of its A according to 30 wherein the organic is a A composition according to Claira 32 vherein the oxalate at least one of the nickel and iron component For the Applicants AMD PARTNERS insufficientOCRQuality
IL39014A 1971-03-24 1972-03-17 Ferromagnetic acicular cobalt particles their preparation and use IL39014A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12751471A 1971-03-24 1971-03-24
US228387A US3892673A (en) 1971-03-24 1972-02-22 Composition of metal salt crystals having a polymeric coating

Publications (2)

Publication Number Publication Date
IL39014A0 IL39014A0 (en) 1972-05-30
IL39014A true IL39014A (en) 1976-10-31

Family

ID=26825704

Family Applications (1)

Application Number Title Priority Date Filing Date
IL39014A IL39014A (en) 1971-03-24 1972-03-17 Ferromagnetic acicular cobalt particles their preparation and use

Country Status (15)

Country Link
US (1) US3892673A (en)
JP (1) JPS5245660B1 (en)
AT (1) AT331052B (en)
BE (1) BE781111A (en)
CA (1) CA972190A (en)
CH (1) CH566396A5 (en)
DE (1) DE2213131A1 (en)
ES (1) ES401098A1 (en)
FR (1) FR2130609B1 (en)
GB (1) GB1382724A (en)
IE (1) IE36220B1 (en)
IL (1) IL39014A (en)
IT (1) IT954521B (en)
NL (1) NL7203970A (en)
SE (1) SE388962B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909240A (en) * 1973-09-28 1975-09-30 Graham Magnetics Inc Method of producing acicular metal crystals
DE2535277C2 (en) * 1975-08-07 1984-10-18 Basf Ag, 6700 Ludwigshafen Use of alkylene oxides to stabilize pyrophoric metal powder particles
NO155316C (en) * 1982-04-23 1987-03-11 Sintef PROCEDURE FOR MAKING MAGNETIC POLYMER PARTICLES.
WO1984002031A1 (en) * 1982-11-10 1984-05-24 Sintef Magnetic polymer particles and process for the preparation thereof
JP4072994B2 (en) * 2001-10-11 2008-04-09 学校法人日本大学 Magnetic particles
CN101781186A (en) * 2009-01-21 2010-07-21 尤米科尔公司 Cobalt oxalate powder and its application for producing co powder with superior cold compression and sintering characters

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2216770A (en) * 1937-02-11 1940-10-08 Glidden Co Method of making metal powders and product
US2621137A (en) * 1948-07-13 1952-12-09 Charles Hardy Inc Reducing metal powders
US2791561A (en) * 1950-04-27 1957-05-07 Gen Aniline & Film Corp Magnetic powders and method of making the same
US3228882A (en) * 1963-01-04 1966-01-11 Chevron Res Dispersions of ferromagnetic cobalt particles
US3228881A (en) * 1963-01-04 1966-01-11 Chevron Res Dispersions of discrete particles of ferromagnetic metals
US3574685A (en) * 1969-01-14 1971-04-13 Ibm Manufacture of magnetic particles by reacting iron,cobalt,or nickel salts with oxalic acid salts in dialkyl sulfoxide

Also Published As

Publication number Publication date
GB1382724A (en) 1975-02-05
SE388962B (en) 1976-10-18
ES401098A1 (en) 1975-07-16
NL7203970A (en) 1972-09-26
IE36220L (en) 1972-09-24
CH566396A5 (en) 1975-09-15
DE2213131A1 (en) 1972-09-28
IE36220B1 (en) 1976-09-15
IL39014A0 (en) 1972-05-30
AT331052B (en) 1976-08-10
BE781111A (en) 1972-09-25
CA972190A (en) 1975-08-05
IT954521B (en) 1973-09-15
JPS5245660B1 (en) 1977-11-17
FR2130609B1 (en) 1978-09-01
FR2130609A1 (en) 1972-11-03
US3892673A (en) 1975-07-01
ATA243672A (en) 1975-10-15

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