GB796464A - Production of acicular iron and magnetic recording media containing the same - Google Patents

Production of acicular iron and magnetic recording media containing the same

Info

Publication number
GB796464A
GB796464A GB23042/56A GB2304256A GB796464A GB 796464 A GB796464 A GB 796464A GB 23042/56 A GB23042/56 A GB 23042/56A GB 2304256 A GB2304256 A GB 2304256A GB 796464 A GB796464 A GB 796464A
Authority
GB
United Kingdom
Prior art keywords
oxide
acicular iron
alkali
production
same
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
GB23042/56A
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.)
HAROLD FRANK STEDMAN
Original Assignee
HAROLD FRANK STEDMAN
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 HAROLD FRANK STEDMAN filed Critical HAROLD FRANK STEDMAN
Publication of GB796464A publication Critical patent/GB796464A/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
    • G11B5/70605—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
    • G11B5/70615—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 Fe metal or 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds

Abstract

Acicular iron particles are made by heating acicular iron oxide to a temperature between 500 DEG C. and the temperature at which acicularity is destroyed, reducing the oxide with a reducing agent selected from the alkali metals and alkali metal hydrides at a temperature below 300 DEG C. and recovering the acicular iron particles. The reaction may be carried out in a molten inorganic reaction medium, e.g. a mixture of alkali hydroxides or alkali hydroxides and alkali halides, and after reduction of the oxide the iron may be recovered by dissolving the medium in water. The heat treatment of the oxide may comprise heating at 750-900 DEG C. for 1 1/2 to 2 1/2 hours. The iron particles are stated to be 1-1.5 microus in length.
GB23042/56A 1955-07-25 1956-07-25 Production of acicular iron and magnetic recording media containing the same Expired GB796464A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US796464XA 1955-07-25 1955-07-25

Publications (1)

Publication Number Publication Date
GB796464A true GB796464A (en) 1958-06-11

Family

ID=22151881

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23042/56A Expired GB796464A (en) 1955-07-25 1956-07-25 Production of acicular iron and magnetic recording media containing the same

Country Status (1)

Country Link
GB (1) GB796464A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368131A1 (en) * 1976-10-14 1978-05-12 Basf Ag PARTICLES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368131A1 (en) * 1976-10-14 1978-05-12 Basf Ag PARTICLES

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