GB1494352A - Method of preparing ferromagnetic material - Google Patents

Method of preparing ferromagnetic material

Info

Publication number
GB1494352A
GB1494352A GB5312474A GB5312474A GB1494352A GB 1494352 A GB1494352 A GB 1494352A GB 5312474 A GB5312474 A GB 5312474A GB 5312474 A GB5312474 A GB 5312474A GB 1494352 A GB1494352 A GB 1494352A
Authority
GB
United Kingdom
Prior art keywords
gas
powder
ferromagnetic powder
dec
iron oxide
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
GB5312474A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1494352A publication Critical patent/GB1494352A/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
    • 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

Abstract

1494352 Producing acicular ferromagnetic powder PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 9 Dec 1974 [11 Dec 1973] 53124/74 Heading C7D In the production of an acicular ferromagnetic powder consisting at least predominantly of Fe, an iron oxide powder or iron oxide hydrate powder (FeOOH) is reduced by a gaseous reducing agent predominantly composed of H 2 at 300‹-600‹C. The volume of reducing gas (calculated at 0‹C and 1 atm.) per hour per g Fe (in the material to be reduced) is at least equal to (0À4 x T) - 120 (where T=reaction temp). The reaction preferably takes place in a fluidized bed, or in a furnace having tilting frames Fig. 1 (not shown), or the material may pass downwardly through the gas, being carried in a zig-zag manner on a succession of gas-permeable belts. The ferromagnetic powder may contain Ge, Sn, Al, Ag, Ni and Co as additives.
GB5312474A 1973-12-11 1974-12-09 Method of preparing ferromagnetic material Expired GB1494352A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732361539 DE2361539C2 (en) 1973-12-11 1973-12-11 Process for the production of a ferromagnetic material consisting predominantly of iron

Publications (1)

Publication Number Publication Date
GB1494352A true GB1494352A (en) 1977-12-07

Family

ID=5900424

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5312474A Expired GB1494352A (en) 1973-12-11 1974-12-09 Method of preparing ferromagnetic material

Country Status (5)

Country Link
JP (1) JPS5093854A (en)
BE (1) BE823140A (en)
DE (1) DE2361539C2 (en)
FR (1) FR2253839B1 (en)
GB (1) GB1494352A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2274286A (en) * 1993-01-13 1994-07-20 Singapore Asahi Chemical & Solder Ind Pte Ltd Cleaning circuit boards with hydrogen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1104852A (en) * 1964-05-21 1968-03-06 Jiyuichi Nara Powder-drying apparatus and plant including the same
NL160106C (en) * 1968-01-31 1979-09-17 Philips Nv PROCESS FOR PREPARING A MAGNETICALLY STABLE POWDER MAINLY OF IRON, FOR MAGNETIC REGISTRATION.
NL162233C (en) * 1968-03-05 1980-04-15 Philips Nv METHOD FOR PREPARING AN IRON MAGNETIC STABLE POWDER, FOR MAGNETIC REGISTRATION.
NL163355C (en) * 1969-04-08 1980-08-15 Philips Nv METHOD FOR PREPARING AN IRON MAGNETIC STABLE METAL POWDER, FOR MAGNETIC REGISTRATION.
NL6909443A (en) * 1969-06-20 1970-12-22
DE2212934A1 (en) * 1972-03-17 1973-09-20 Philips Nv Iron powder prodn for magnetic recording - by redn of needle-like crystals of iron oxide or its hydrate in presence of
DE2212933A1 (en) * 1972-03-17 1973-09-20 Philips Nv Process for the production of a metal powder consisting essentially of iron

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2274286A (en) * 1993-01-13 1994-07-20 Singapore Asahi Chemical & Solder Ind Pte Ltd Cleaning circuit boards with hydrogen
GB2274286B (en) * 1993-01-13 1996-11-06 Singapore Asahi Chemical & Solder Ind Pte Ltd Method of and apparatus for preparing an electric circuit board for a flow or wave soldering process

Also Published As

Publication number Publication date
FR2253839A1 (en) 1975-07-04
DE2361539C2 (en) 1984-06-20
FR2253839B1 (en) 1979-08-10
JPS5093854A (en) 1975-07-26
BE823140A (en) 1975-06-09
DE2361539A1 (en) 1975-06-12

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Legal Events

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