BE792840A - Particules de fer magnétique aciculaires stables - Google Patents

Particules de fer magnétique aciculaires stables

Info

Publication number
BE792840A
BE792840A BE792840DA BE792840A BE 792840 A BE792840 A BE 792840A BE 792840D A BE792840D A BE 792840DA BE 792840 A BE792840 A BE 792840A
Authority
BE
Belgium
Prior art keywords
magnetic iron
iron particles
stable needle
needle
stable
Prior art date
Application number
Other languages
English (en)
French (fr)
Inventor
P Y Hwang Ete F Arvin
Original Assignee
Ampex
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.)
Publication date
Publication of BE792840A publication Critical patent/BE792840A/xx

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
    • 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
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/14—Treatment of metallic powder
    • B22F1/145—Chemical treatment, e.g. passivation or decarburisation
    • 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
    • H01F1/061—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 with a protective layer
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Powder Metallurgy (AREA)
  • Soft Magnetic Materials (AREA)
BE792840D 1971-12-30 Particules de fer magnétique aciculaires stables BE792840A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US21445271A 1971-12-30 1971-12-30

Publications (1)

Publication Number Publication Date
BE792840A true BE792840A (fr) 1973-03-30

Family

ID=22799142

Family Applications (1)

Application Number Title Priority Date Filing Date
BE792840D BE792840A (fr) 1971-12-30 Particules de fer magnétique aciculaires stables

Country Status (8)

Country Link
US (1) US3748119A (cs)
JP (1) JPS5219541B2 (cs)
BE (1) BE792840A (cs)
DE (1) DE2262161C3 (cs)
FR (1) FR2165967B1 (cs)
GB (1) GB1358118A (cs)
IT (1) IT973717B (cs)
NL (1) NL150938B (cs)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3977985A (en) * 1972-02-23 1976-08-31 Tdk Electronics Company, Limited Magnetic recording medium comprising cobalt or cobalt alloy coated particles of spicular magnetite
NL167729C (nl) * 1973-05-03 1982-01-18 Philips Nv Werkwijze voor het bereiden van een hoofdzakelijk uit ijzer bestaand metaalpoeder.
JPS5631882B2 (cs) * 1973-11-16 1981-07-24
DE2434096C2 (de) * 1974-07-16 1985-10-17 Basf Ag, 6700 Ludwigshafen Nadelförmige, vorwiegend aus Eisen bestehende ferromagnetische Metallteilchen und Verfahren zu ihrer Herstellung
JPS6017802B2 (ja) * 1975-09-05 1985-05-07 株式会社日立製作所 強磁性金属粉末の製造方法
US4023989A (en) * 1975-10-20 1977-05-17 Monsanto Company Method for producing corded steel wire
JPS52134858A (en) * 1976-05-07 1977-11-11 Kanto Denka Kogyo Kk Method of making magnetic recording magnetic powder containing iron as main constituent
JPS534895A (en) * 1976-06-16 1978-01-17 Fujitsu Ltd Manufacture of needle-shaped magnetic iron particles
US4222977A (en) * 1978-05-16 1980-09-16 Monsanto Company Process to produce inorganic hollow fibers
JPS55114880A (en) * 1979-02-28 1980-09-04 Hitachi Ltd Pulser for generating ignition signal
JPS5914081B2 (ja) * 1979-10-05 1984-04-03 日立マクセル株式会社 耐蝕性に優れた金属磁性粉末の製造法
EP0041727B1 (en) * 1980-06-11 1987-09-09 Hitachi Maxell Ltd. Process for preparing ferromagnetic particles comprising metallic iron
JPH0620008B2 (ja) * 1987-08-24 1994-03-16 チッソ株式会社 酸化皮膜を有する強磁性金属粉末の製造方法
US5234489A (en) * 1992-05-27 1993-08-10 L'air Liquide Process for reducing oxides contained in iron powder without substantial decarburization thereof
US7566680B2 (en) * 2002-05-15 2009-07-28 Sud-Chemie Inc. High surface area iron material prepared from a low surface area iron metal precursor
US7199077B2 (en) * 2002-05-15 2007-04-03 Sud-Chemie Inc. Fischer-tropsch catalyst prepared with a high purity iron precursor
US7939463B1 (en) * 2002-05-15 2011-05-10 Sud-Chemie Inc. Preparation of iron oxides

Also Published As

Publication number Publication date
NL7217833A (cs) 1973-07-03
JPS4879153A (cs) 1973-10-24
GB1358118A (en) 1974-06-26
FR2165967A1 (cs) 1973-08-10
FR2165967B1 (cs) 1976-06-04
DE2262161B2 (de) 1975-01-23
US3748119A (en) 1973-07-24
DE2262161C3 (de) 1980-01-24
NL150938B (nl) 1976-09-15
IT973717B (it) 1974-06-10
DE2262161A1 (de) 1973-08-16
JPS5219541B2 (cs) 1977-05-28

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Legal Events

Date Code Title Description
RE20 Patent expired

Owner name: AMPEX MEDIA CORP.

Effective date: 19921215