JPS57130403A - Magnetic powder and magnet - Google Patents

Magnetic powder and magnet

Info

Publication number
JPS57130403A
JPS57130403A JP56016070A JP1607081A JPS57130403A JP S57130403 A JPS57130403 A JP S57130403A JP 56016070 A JP56016070 A JP 56016070A JP 1607081 A JP1607081 A JP 1607081A JP S57130403 A JPS57130403 A JP S57130403A
Authority
JP
Japan
Prior art keywords
magnetic
powder
ferromagnetic material
grain size
temperature
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.)
Pending
Application number
JP56016070A
Other languages
Japanese (ja)
Inventor
Tetsuo Kato
Takeshi Anpo
Takahiro Motone
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.)
Daido Steel Co Ltd
Original Assignee
Daido Steel Co 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 Daido Steel Co Ltd filed Critical Daido Steel Co Ltd
Priority to JP56016070A priority Critical patent/JPS57130403A/en
Publication of JPS57130403A publication Critical patent/JPS57130403A/en
Pending 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
    • H01F1/10—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

PURPOSE:To obtain magnetic powder and magnet which are excellent in magnetic anisotropy, by a method wherein ferromagnetic material powder having specified chemical composition is classified at temperature more than magnetic transformation point, controlled to the grain size approximate to single magnetic domain critical diameter and further molded to sinter. CONSTITUTION:Material having chemical composition of MO.nFe2O3 (M is a kind of two kinds or more of Ba, Sr, Pb and Ca, while n is 4-6) or RCOn (R is a kind or two kinds or more of rare earth elements, while n is 5-8.5) is used as powdered ferromagnetic material. Said ferromagnetic material powder is introduced to a cyclone by a screen set in the furnace kept at required temperature and with the powder put on high temperature gas to classify at temperature more than magnetic transformation point. This provides magnetic powder controlled to the grain size approximately to the single magnetic domain critical diameter. Further, the magnetic powder is used to mold and burn for permanent magnet. Thus, the control of grain size allows the manufacture of permanent magnet with magnetic characteristic excellent over ferromagnetic material with high magnetic anisotropy constant.
JP56016070A 1981-02-05 1981-02-05 Magnetic powder and magnet Pending JPS57130403A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56016070A JPS57130403A (en) 1981-02-05 1981-02-05 Magnetic powder and magnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56016070A JPS57130403A (en) 1981-02-05 1981-02-05 Magnetic powder and magnet

Publications (1)

Publication Number Publication Date
JPS57130403A true JPS57130403A (en) 1982-08-12

Family

ID=11906301

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56016070A Pending JPS57130403A (en) 1981-02-05 1981-02-05 Magnetic powder and magnet

Country Status (1)

Country Link
JP (1) JPS57130403A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4855206A (en) * 1988-08-05 1989-08-08 Eastman Kodak Company Rare earth containing magnetic carrier particles
JP2007123511A (en) * 2005-10-27 2007-05-17 Tdk Corp Ferrite sintered magnet

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4855206A (en) * 1988-08-05 1989-08-08 Eastman Kodak Company Rare earth containing magnetic carrier particles
JP2007123511A (en) * 2005-10-27 2007-05-17 Tdk Corp Ferrite sintered magnet
JP4730534B2 (en) * 2005-10-27 2011-07-20 Ｔｄｋ株式会社 Ferrite sintered magnet

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