JPS5773105A - Production of ferromagnetic metallic powder - Google Patents

Production of ferromagnetic metallic powder

Info

Publication number
JPS5773105A
JPS5773105A JP55150476A JP15047680A JPS5773105A JP S5773105 A JPS5773105 A JP S5773105A JP 55150476 A JP55150476 A JP 55150476A JP 15047680 A JP15047680 A JP 15047680A JP S5773105 A JPS5773105 A JP S5773105A
Authority
JP
Japan
Prior art keywords
magnetic
particles
iron
needle
metallic powder
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.)
Granted
Application number
JP55150476A
Other languages
Japanese (ja)
Other versions
JPS5917161B2 (en
Inventor
Seiichi Kuno
Takeharu Yamamura
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.)
Douwa Kogyo Kk
Dowa Holdings Co Ltd
Original Assignee
Douwa Kogyo Kk
Dowa Mining 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 Douwa Kogyo Kk, Dowa Mining Co Ltd filed Critical Douwa Kogyo Kk
Priority to JP55150476A priority Critical patent/JPS5917161B2/en
Publication of JPS5773105A publication Critical patent/JPS5773105A/en
Publication of JPS5917161B2 publication Critical patent/JPS5917161B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Paints Or Removers (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

PURPOSE: To produce ferromagnetic metallic powder for magnetic recording which holds needle-like characteristics and is free from sintering among particles by reducing the needle particles consisting of hydrate, hydroxide or oxide of iron consisting essentially of iron which forms solid solution of Al on the surface.
CONSTITUTION: Needle particles of iron hydrate such as α-FeOOH, γ-FeOOH formed solid solution of Al on the surface in such a way as to have 0.01W0.20 solid solution rates Al/Fe, or iron oxide such as α-Fe2O3, γ-Fe2O3, Fe3O4 are dried, and are heated to 300W600°C in gaseous hydrogen flow, whereby they are reduced. Next, they are cooled at room temp., whereby the ferromagnetic metallic powder which is free from sintered parts among the particles, is superior in magnetic characteristics and is suited for recording media such as magnetic tapes, magnetic discs, magnetic cards, is produced widthout using any sintering preventing agent, while the needle state is maintained.
COPYRIGHT: (C)1982,JPO&Japio
JP55150476A 1980-10-27 1980-10-27 Method for producing ferromagnetic metal powder Expired JPS5917161B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55150476A JPS5917161B2 (en) 1980-10-27 1980-10-27 Method for producing ferromagnetic metal powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55150476A JPS5917161B2 (en) 1980-10-27 1980-10-27 Method for producing ferromagnetic metal powder

Publications (2)

Publication Number Publication Date
JPS5773105A true JPS5773105A (en) 1982-05-07
JPS5917161B2 JPS5917161B2 (en) 1984-04-19

Family

ID=15497723

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55150476A Expired JPS5917161B2 (en) 1980-10-27 1980-10-27 Method for producing ferromagnetic metal powder

Country Status (1)

Country Link
JP (1) JPS5917161B2 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59207024A (en) * 1983-05-10 1984-11-24 Konishiroku Photo Ind Co Ltd Magnetic recording medium
JPS63168824A (en) * 1986-12-30 1988-07-12 Konica Corp Magnetic recording medium
JPS63168822A (en) * 1986-12-30 1988-07-12 Konica Corp Magnetic recording medium
JPS63168825A (en) * 1986-12-30 1988-07-12 Konica Corp Magnetic recording medium
JPS63168821A (en) * 1986-12-30 1988-07-12 Konica Corp Magnetic recording medium
JPS63168823A (en) * 1986-12-30 1988-07-12 Konica Corp Magnetic recording medium
JPS63224025A (en) * 1987-03-13 1988-09-19 Konica Corp Magnetic recording medium
JPH02132631A (en) * 1989-04-10 1990-05-22 Konica Corp Magnetic recording medium
JPH02168415A (en) * 1989-04-10 1990-06-28 Konica Corp Magnetic recording medium
JPH03116414A (en) * 1990-08-31 1991-05-17 Konica Corp Magnetic recording medium
JPH03150721A (en) * 1990-09-21 1991-06-27 Konica Corp Magnetic recording medium
JP2005268389A (en) * 2004-03-17 2005-09-29 Dowa Mining Co Ltd Iron-nitride magnetic powder and its manufacturing method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007194666A (en) * 2007-04-09 2007-08-02 Dowa Holdings Co Ltd Precursor for use in manufacturing ferromagnetic metal powder

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59207024A (en) * 1983-05-10 1984-11-24 Konishiroku Photo Ind Co Ltd Magnetic recording medium
JPS6322366B2 (en) * 1983-05-10 1988-05-11 Konika Kk
JPS63168823A (en) * 1986-12-30 1988-07-12 Konica Corp Magnetic recording medium
JPS63168822A (en) * 1986-12-30 1988-07-12 Konica Corp Magnetic recording medium
JPS63168825A (en) * 1986-12-30 1988-07-12 Konica Corp Magnetic recording medium
JPS63168821A (en) * 1986-12-30 1988-07-12 Konica Corp Magnetic recording medium
JPS63168824A (en) * 1986-12-30 1988-07-12 Konica Corp Magnetic recording medium
JPS63224025A (en) * 1987-03-13 1988-09-19 Konica Corp Magnetic recording medium
JPH02132631A (en) * 1989-04-10 1990-05-22 Konica Corp Magnetic recording medium
JPH02168415A (en) * 1989-04-10 1990-06-28 Konica Corp Magnetic recording medium
JPH0580048B2 (en) * 1989-04-10 1993-11-05 Konishiroku Photo Ind
JPH03116414A (en) * 1990-08-31 1991-05-17 Konica Corp Magnetic recording medium
JPH03150721A (en) * 1990-09-21 1991-06-27 Konica Corp Magnetic recording medium
JP2005268389A (en) * 2004-03-17 2005-09-29 Dowa Mining Co Ltd Iron-nitride magnetic powder and its manufacturing method
JP4534059B2 (en) * 2004-03-17 2010-09-01 Ｄｏｗａエレクトロニクス株式会社 Iron nitride magnetic powder and method for producing the same

Also Published As

Publication number Publication date
JPS5917161B2 (en) 1984-04-19

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