GB1418733A - Methods of making acicular magnetic powders pneumatic tyres - Google Patents

Methods of making acicular magnetic powders pneumatic tyres

Info

Publication number
GB1418733A
GB1418733A GB479473A GB479473A GB1418733A GB 1418733 A GB1418733 A GB 1418733A GB 479473 A GB479473 A GB 479473A GB 479473 A GB479473 A GB 479473A GB 1418733 A GB1418733 A GB 1418733A
Authority
GB
United Kingdom
Prior art keywords
ions
methods
modified
magnetic powders
pneumatic tyres
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
GB479473A
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of GB1418733A publication Critical patent/GB1418733A/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
    • H01F1/032—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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/02—Oxides; Hydroxides
    • C01G49/06—Ferric oxide [Fe2O3]
    • 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
    • G11B5/70626—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 containing non-metallic substances
    • G11B5/70642—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 containing non-metallic substances iron oxides
    • G11B5/70652—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 containing non-metallic substances iron oxides gamma - Fe2 O3
    • G11B5/70668—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 containing non-metallic substances iron oxides gamma - Fe2 O3 containing a dopant
    • G11B5/70673—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 containing non-metallic substances iron oxides gamma - Fe2 O3 containing a dopant containing Co
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/50—Solid solutions
    • C01P2002/52—Solid solutions containing elements as dopants
    • C01P2002/54—Solid solutions containing elements as dopants one element only
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/54—Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/42—Magnetic properties

Landscapes

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

Abstract

1418733 Cobalt modified iron oxide SONY CORP 31 Jan 1973 [4 Feb 1972] 4794/73 Heading C1A An acicular cobalt modified iron oxidehydroxide is made by forming a mixture of Fe<SP>2</SP> +ions, Co<SP>2+</SP> ions and hydroxyl ions to form a suspension of the hydroxides, the number of Co<SP>2+</SP> ions being not more than 30% of the total of Co<SP>2+</SP> + Fe<SP>2+</SP> ions and the number of OH ions being more than 2À5 times the total of Co<SP>2+</SP> + Fe<SP>2+</SP>, and oxidizing the suspension by passing air through it to form the cobalt modified iron oxide-hydroxide. The modified iron oxidehydroxide can be converted to Co modified Fe 3 O 4 by reduction with hydrogen and optionally reoxidized by heating in oxygen to Co modified Fe 2 O 3 for use in the manufacture of magnetic recording media.
GB479473A 1972-02-04 1973-01-31 Methods of making acicular magnetic powders pneumatic tyres Expired GB1418733A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1294572A JPS5529577B2 (en) 1972-02-04 1972-02-04

Publications (1)

Publication Number Publication Date
GB1418733A true GB1418733A (en) 1975-12-24

Family

ID=11819406

Family Applications (1)

Application Number Title Priority Date Filing Date
GB479473A Expired GB1418733A (en) 1972-02-04 1973-01-31 Methods of making acicular magnetic powders pneumatic tyres

Country Status (6)

Country Link
JP (1) JPS5529577B2 (en)
DE (1) DE2305153A1 (en)
FR (1) FR2170278B1 (en)
GB (1) GB1418733A (en)
IT (1) IT978774B (en)
NL (1) NL7301614A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414245A (en) 1981-07-28 1983-11-08 Ishihara Sangyo Kaisha, Ltd. Process for producing cobalt containing ferromagnetic iron oxides

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5941289B2 (en) * 1974-03-12 1984-10-05 富士写真フイルム株式会社 Manufacturing method of magnetic iron oxide
JPS6011446B2 (en) * 1976-07-15 1985-03-26 日立マクセル株式会社 Manufacturing method of ferromagnetic metal powder
JPS6044805B2 (en) * 1976-08-27 1985-10-05 日本ビクター株式会社 Method for manufacturing magnetic recording media
JPS53127400A (en) * 1977-04-13 1978-11-07 Nippon Telegr & Teleph Corp <Ntt> Production of goethite
JPS5562105A (en) * 1978-10-30 1980-05-10 Hitachi Maxell Ltd Production of magnetic alloy powder
JPS5571002A (en) * 1978-11-24 1980-05-28 Hitachi Ltd Manufacture of magnetic powder for magnetic recording medium
JPS5573803A (en) * 1978-11-25 1980-06-03 Hitachi Maxell Ltd Production of magnetic alloy powder
JPS583250A (en) * 1981-06-30 1983-01-10 Toshiba Corp Manufacture of semiconductor device
JPS5869964U (en) * 1981-11-06 1983-05-12 日本電気株式会社 solar panel
JPS62127577U (en) * 1986-02-06 1987-08-13
JPH01257309A (en) * 1988-04-07 1989-10-13 Tdk Corp Magnetic powder for magnetic recording medium and manufacture thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3117933A (en) * 1959-06-12 1964-01-14 Bayer Ag Process for the production of needleshaped, cobalt-containing gamma-ferric oxide crystalline particles
DE1204644B (en) * 1962-03-30 1965-11-11 Basf Ag Process for the production of acicular iron oxide yellow, alpha-OH, which is particularly suitable as a starting material for the production of highly coercive ª † iron (III) oxide
DE1247026B (en) * 1965-01-09 1967-08-10 Basf Ag Process for the production of magnetizable metallic particles suitable for the production of magnetogram carriers
GB1212126A (en) * 1967-08-07 1970-11-11 Toda Kogyo Kabushiki Kaisha A METHOD OF MANUFACTURING gamma-Fe2O3 PARTICLES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414245A (en) 1981-07-28 1983-11-08 Ishihara Sangyo Kaisha, Ltd. Process for producing cobalt containing ferromagnetic iron oxides

Also Published As

Publication number Publication date
JPS4882395A (en) 1973-11-02
DE2305153A1 (en) 1973-08-16
JPS5529577B2 (en) 1980-08-05
IT978774B (en) 1974-09-20
FR2170278B1 (en) 1978-04-21
FR2170278A1 (en) 1973-09-14
NL7301614A (en) 1973-08-07

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee