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GB677878A - Improvements in the production of magnetic iron oxides - Google Patents

Improvements in the production of magnetic iron oxides

Info

Publication number
GB677878A
GB677878A GB31101/50A GB3110150A GB677878A GB 677878 A GB677878 A GB 677878A GB 31101/50 A GB31101/50 A GB 31101/50A GB 3110150 A GB3110150 A GB 3110150A GB 677878 A GB677878 A GB 677878A
Authority
GB
United Kingdom
Prior art keywords
oxygen
iron
temperature
air
magnetic
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
GB31101/50A
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.)
BASF SE
Original Assignee
BASF SE
Badische Anilin and Sodafabrik AG
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 BASF SE, Badische Anilin and Sodafabrik AG filed Critical BASF SE
Publication of GB677878A publication Critical patent/GB677878A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • G11B5/70647—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 with a skin

Landscapes

  • Health & Medical Sciences (AREA)
  • Dermatology (AREA)
  • General Health & Medical Sciences (AREA)
  • Compounds Of Iron (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

Magnetic iron oxide, suitable for the production of magnetic recorders, is prepared by burning iron carbonyl while supplying only such an amount of oxygen that the resulting product has atomic ratio of oxygen to iron of less than 3:2. Combustion may take place at a burner nozzle at a temperature of 100 to 1500 DEG C, the temperature being varied by preheating the air used, or by adding oxygen or nitrogen, &c. thereto, or by employing oxygen alone, or by admixing other combustible gases or liquids, or by thermally insulating or cooling the combustion chamber. Other substances, e.g. silicon or tin tetrachlorides, or finely divided aluminium or silicon oxides, may be introduced with the air, or into the combustion chamber, or into the combustion products. Steam, &c. may also be added. The iron (ferrosoferric) oxide produced may be oxidized whilst still in suspension at temperatures below 500 DEG C, or even above this temperature if the products are cooled rapidly, by introducing further amounts of air or oxygen, to produce magnetic g -ferric oxide.
GB31101/50A 1949-12-29 1950-12-21 Improvements in the production of magnetic iron oxides Expired GB677878A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE677878X 1949-12-29

Publications (1)

Publication Number Publication Date
GB677878A true GB677878A (en) 1952-08-20

Family

ID=6594193

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31101/50A Expired GB677878A (en) 1949-12-29 1950-12-21 Improvements in the production of magnetic iron oxides

Country Status (1)

Country Link
GB (1) GB677878A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950955A (en) * 1956-12-31 1960-08-30 Degussa Process for the preparation of finely divided ferromagnetic ferric oxide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950955A (en) * 1956-12-31 1960-08-30 Degussa Process for the preparation of finely divided ferromagnetic ferric oxide

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