EP0063730A3 - Procédé de stabilisation de particules métalliques pyrophores ferromagnétiques aciculaires constituées essentiellement par du fer - Google Patents

Procédé de stabilisation de particules métalliques pyrophores ferromagnétiques aciculaires constituées essentiellement par du fer

Info

Publication number
EP0063730A3
EP0063730A3 EP82103010A EP82103010A EP0063730A3 EP 0063730 A3 EP0063730 A3 EP 0063730A3 EP 82103010 A EP82103010 A EP 82103010A EP 82103010 A EP82103010 A EP 82103010A EP 0063730 A3 EP0063730 A3 EP 0063730A3
Authority
EP
European Patent Office
Prior art keywords
pyrophoric
metal particles
stabilising
iron
ferromagnetic metal
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.)
Withdrawn
Application number
EP82103010A
Other languages
German (de)
English (en)
Other versions
EP0063730A2 (fr
Inventor
Helmut Dr. Jakusch
Werner Dr. Loeser
Eberhard Dr. Koester
Peter Dr. Rudolf
Werner Dr. Senkpiel
Werner Dr. Steck
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
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 filed Critical BASF SE
Publication of EP0063730A2 publication Critical patent/EP0063730A2/fr
Publication of EP0063730A3 publication Critical patent/EP0063730A3/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C23C8/12—Oxidising using elemental oxygen or ozone
    • C23C8/14—Oxidising of ferrous surfaces
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)
  • Magnetic Record Carriers (AREA)
  • Powder Metallurgy (AREA)
  • Compounds Of Iron (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Paints Or Removers (AREA)
EP82103010A 1981-04-25 1982-04-08 Procédé de stabilisation de particules métalliques pyrophores ferromagnétiques aciculaires constituées essentiellement par du fer Withdrawn EP0063730A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813116489 DE3116489A1 (de) 1981-04-25 1981-04-25 Verfahren zur stabilisierung pyrophorer, im wesentlichen aus eisen bestehender ferromagnetischer nadelfoermiger metallteilchen
DE3116489 1981-04-25

Publications (2)

Publication Number Publication Date
EP0063730A2 EP0063730A2 (fr) 1982-11-03
EP0063730A3 true EP0063730A3 (fr) 1983-04-13

Family

ID=6130824

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103010A Withdrawn EP0063730A3 (fr) 1981-04-25 1982-04-08 Procédé de stabilisation de particules métalliques pyrophores ferromagnétiques aciculaires constituées essentiellement par du fer

Country Status (4)

Country Link
US (1) US4420330A (fr)
EP (1) EP0063730A3 (fr)
JP (1) JPS57181301A (fr)
DE (1) DE3116489A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59110701A (ja) * 1982-12-16 1984-06-26 Mitsui Toatsu Chem Inc 磁気記録用還元鉄粉の安定化方法
DE3330767A1 (de) * 1983-08-26 1985-03-14 Bayer Ag, 5090 Leverkusen Handhabungsstabile im wesentlichen aus eisen bestehende magnetpigmente, verfahren zu ihrer herstellung sowie ihre verwendung
DE3422916A1 (de) * 1984-06-20 1986-01-02 Bayer Ag, 5090 Leverkusen Im wesentlichen aus eisen bestehende magnetische pigmente, verfahren zu ihrer herstellung sowie deren verwendung
JPS63199801A (ja) * 1987-02-12 1988-08-18 Chisso Corp 強磁性金属粉末の安定化処理装置
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
JP2739600B2 (ja) * 1989-10-03 1998-04-15 富士写真フイルム株式会社 強磁性金属粉末の処理方法及び磁気記録媒体の製造方法
DE4115426A1 (de) * 1991-05-10 1992-11-12 Basf Magnetics Gmbh Verfahren zum stabilisieren von nadelfoermigen, im wesentlichen aus eisen bestehenden, ferromagnetischen metallpulvern
JPH07503499A (ja) * 1991-11-22 1995-04-13 アンペックス・メディア・コーポレーション 金属粒子の貯蔵方法
GB2288411B (en) * 1994-03-24 1998-04-15 Silberline Ltd Metal pigments
US5849817A (en) * 1994-03-24 1998-12-15 Silberline Limited Metal pigments
JP2001305733A (ja) * 2000-04-18 2001-11-02 Sumitomo Chem Co Ltd 感光性組成物の保存方法
CN100463863C (zh) * 2006-11-24 2009-02-25 金川集团有限公司 一种防止超细羰基铁粉自燃的方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2046957A1 (fr) * 1969-06-20 1971-03-12 Philips Nv
FR2090199A1 (fr) * 1970-05-22 1972-01-14 Ampex
NL7018910A (en) * 1970-12-29 1972-07-03 Passivating ferromagnetic powder - by treating cooled moving powder with limited amount of oxygen at controlled temp and gradually
DE2524520A1 (de) * 1975-06-03 1976-12-16 Philips Patentverwaltung Verfahren zur stabilisierung pyrophorer eisenpulver

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3520676A (en) * 1968-05-28 1970-07-14 Eastman Kodak Co Stabilization of pyrophoric metal powder
US3767477A (en) * 1971-12-27 1973-10-23 Eastman Kodak Co Method for producing oxide coated iron powder of controlled resistance for electrostatic copying systems
DE2212934A1 (de) * 1972-03-17 1973-09-20 Philips Nv Verfahren zur herstellung eines im wesentlichen aus eisen bestehenden metallpulvers
US3926617A (en) * 1973-02-21 1975-12-16 Midrex Corp Passivation of metallized pellets in bulk
US3967986A (en) * 1975-01-27 1976-07-06 U.S. Philips Corporation Method of preparing ferromagnetic material
DE2646348C2 (de) * 1976-10-14 1986-08-28 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von nadelförmigen, ferromagnetischen, im wesentlichen aus Eisen bestehenden Metallteilchen und deren Verwendung zur Herstellung von magnetischen Aufzeichnungsträgern
US4207092A (en) * 1977-03-03 1980-06-10 E. I. Du Pont De Nemours And Company Acicular α-iron particles, their preparation and recording media employing same
US4251592A (en) * 1979-04-03 1981-02-17 Toda Kogyo Corp. Stabilization treatment of acicular ferromagnetic iron or iron-alloy particles against the oxidation thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2046957A1 (fr) * 1969-06-20 1971-03-12 Philips Nv
FR2090199A1 (fr) * 1970-05-22 1972-01-14 Ampex
NL7018910A (en) * 1970-12-29 1972-07-03 Passivating ferromagnetic powder - by treating cooled moving powder with limited amount of oxygen at controlled temp and gradually
DE2524520A1 (de) * 1975-06-03 1976-12-16 Philips Patentverwaltung Verfahren zur stabilisierung pyrophorer eisenpulver

Also Published As

Publication number Publication date
JPS57181301A (en) 1982-11-08
EP0063730A2 (fr) 1982-11-03
US4420330A (en) 1983-12-13
DE3116489A1 (de) 1982-11-11

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): DE FR GB NL

PUAL Search report despatched

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17P Request for examination filed

Effective date: 19821211

AK Designated contracting states

Designated state(s): DE FR GB NL

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19840620

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LOESER, WERNER, DR.

Inventor name: RUDOLF, PETER, DR.

Inventor name: STECK, WERNER, DR.

Inventor name: SENKPIEL, WERNER, DR.

Inventor name: KOESTER, EBERHARD, DR.

Inventor name: JAKUSCH, HELMUT, DR.