GB1265768A - - Google Patents

Info

Publication number
GB1265768A
GB1265768A GB1265768DA GB1265768A GB 1265768 A GB1265768 A GB 1265768A GB 1265768D A GB1265768D A GB 1265768DA GB 1265768 A GB1265768 A GB 1265768A
Authority
GB
United Kingdom
Prior art keywords
powder
june
length
fluidized bed
bed
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
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 filed Critical
Publication of GB1265768A publication Critical patent/GB1265768A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B22F9/22—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds using gaseous reductors
    • 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
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Health & Medical Sciences (AREA)
  • Dermatology (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Hard Magnetic Materials (AREA)
  • Magnetic Record Carriers (AREA)
  • Paints Or Removers (AREA)

Abstract

1,265,768. Producing iron powder. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. June 17, 1970 [June 20, 1969], No.29378/70. Heading C7D. Iron powder for magnetic recording, consisting of rod shaped particles of length 0À5 to 2 microns, the length being at least five times the largest diameter of any cross-section, is obtained by pseudomorphously reducing an iron oxide powder in a fluidized bed with a gas consisting of at least 50% by volume of hydrogen. Following reduction the powder may be stabilized in the same fluidized bed by treating it with a weakly oxidizing gas at 20‹ to 500 C., possibly followed by treatment in the bed with pure oxygen, again at not more than 50‹C.
GB1265768D 1969-06-20 1970-06-17 Expired GB1265768A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6909443A NL6909443A (en) 1969-06-20 1969-06-20

Publications (1)

Publication Number Publication Date
GB1265768A true GB1265768A (en) 1972-03-08

Family

ID=19807253

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1265768D Expired GB1265768A (en) 1969-06-20 1970-06-17

Country Status (7)

Country Link
AT (1) AT298823B (en)
BE (1) BE752202A (en)
CH (1) CH531904A (en)
DE (1) DE2028536A1 (en)
FR (1) FR2046957B1 (en)
GB (1) GB1265768A (en)
NL (1) NL6909443A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4056410A (en) * 1974-11-29 1977-11-01 Montedison, S.P.A. Process for preparing acicular iron powders containing titanium and tin, and the resulting powders when so prepared
US4420330A (en) 1981-04-25 1983-12-13 Basf Aktiengesellschaft Stabilization of pyrophoric ferromagnetic acicular metal particles consisting essentially of iron
US5199998A (en) * 1991-05-10 1993-04-06 Basf Aktiengesellschaft Stabilization of acicular, ferromagnetic metal powders essentially consisting of iron

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2361539C2 (en) * 1973-12-11 1984-06-20 Philips Patentverwaltung Gmbh, 2000 Hamburg Process for the production of a ferromagnetic material consisting predominantly of iron
DE3021111A1 (en) * 1980-06-04 1981-12-17 Basf Ag, 6700 Ludwigshafen METHOD FOR THE PRODUCTION OF NEEDLE-SHAPED, FERROMAGNETIC METAL PARTICLES, ESSENTIALLY made of IRON
DE4294047T1 (en) * 1991-11-22 1996-09-26 Ampex Media Corp Storage of metal particles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4056410A (en) * 1974-11-29 1977-11-01 Montedison, S.P.A. Process for preparing acicular iron powders containing titanium and tin, and the resulting powders when so prepared
US4420330A (en) 1981-04-25 1983-12-13 Basf Aktiengesellschaft Stabilization of pyrophoric ferromagnetic acicular metal particles consisting essentially of iron
US5199998A (en) * 1991-05-10 1993-04-06 Basf Aktiengesellschaft Stabilization of acicular, ferromagnetic metal powders essentially consisting of iron

Also Published As

Publication number Publication date
FR2046957A1 (en) 1971-03-12
FR2046957B1 (en) 1973-01-12
DE2028536A1 (en) 1970-12-23
NL6909443A (en) 1970-12-22
AT298823B (en) 1972-05-25
BE752202A (en) 1970-12-18
CH531904A (en) 1972-12-31

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Legal Events

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