JPS55161007A - Production of needle-like crystalline metal iron magnetic particle powder - Google Patents

Production of needle-like crystalline metal iron magnetic particle powder

Info

Publication number
JPS55161007A
JPS55161007A JP6829879A JP6829879A JPS55161007A JP S55161007 A JPS55161007 A JP S55161007A JP 6829879 A JP6829879 A JP 6829879A JP 6829879 A JP6829879 A JP 6829879A JP S55161007 A JPS55161007 A JP S55161007A
Authority
JP
Japan
Prior art keywords
needle
particles
crystalline
metal iron
particle 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
JP6829879A
Other languages
Japanese (ja)
Other versions
JPS5853686B2 (en
Inventor
Nanao Horiishi
Atsushi Takedoi
Akira Mukozaka
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.)
Toda Kogyo Corp
Original Assignee
Toda Kogyo Corp
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 Toda Kogyo Corp filed Critical Toda Kogyo Corp
Priority to JP54068298A priority Critical patent/JPS5853686B2/en
Publication of JPS55161007A publication Critical patent/JPS55161007A/en
Publication of JPS5853686B2 publication Critical patent/JPS5853686B2/en
Expired legal-status Critical Current

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

Abstract

PURPOSE:To produce needle-like crystalline metal iron particle powder of magnetic material for magnetic recording having high dispersing, high orientating, and high filling properties, by heating and baking needle-like crystalline hematite particles containing a trace of Si in nonreducing gas to develop sufficient and uniform particle growth of single particles. CONSTITUTION:In aqueous solution of more than pH11 containing Fe(OH)2 obtained by reaction of aqueous solution of ferrous salt alkaline aqueous solution, water-soluble silicate is added, and oxidized to make needle-like crystalline goethite particles. These particles are filtered, washed in water, dried, heated, and dehydrated to obtain needle-like crystalline hematite particles, which are heated and baked at 350-700 deg.C, at steam particle pressure of 30-100%, in an atmosphere consisting of heating steam and nonreducing gas to produce high-density needle-like crystalline hematite particles. The obtained particles are heated and reduced at 350-600 deg.C in reducing gas, thereby producing needle-like crystalline metal iron particle powder excelling in magnetic characteristics as the magnetic material for magnetic recording.
JP54068298A 1979-05-31 1979-05-31 Method for producing acicular crystal metal iron magnetic particle powder Expired JPS5853686B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54068298A JPS5853686B2 (en) 1979-05-31 1979-05-31 Method for producing acicular crystal metal iron magnetic particle powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54068298A JPS5853686B2 (en) 1979-05-31 1979-05-31 Method for producing acicular crystal metal iron magnetic particle powder

Publications (2)

Publication Number Publication Date
JPS55161007A true JPS55161007A (en) 1980-12-15
JPS5853686B2 JPS5853686B2 (en) 1983-11-30

Family

ID=13369728

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54068298A Expired JPS5853686B2 (en) 1979-05-31 1979-05-31 Method for producing acicular crystal metal iron magnetic particle powder

Country Status (1)

Country Link
JP (1) JPS5853686B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS595424A (en) * 1982-07-01 1984-01-12 Sony Corp Magnetic recording medium
JPH01106328A (en) * 1987-10-19 1989-04-24 Konica Corp Magnetic recording medium
JPH02197503A (en) * 1989-01-27 1990-08-06 Toda Kogyo Corp Magnetic acicular iron alloy powder for magnetic recording and its production

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS595424A (en) * 1982-07-01 1984-01-12 Sony Corp Magnetic recording medium
JPH0159646B2 (en) * 1982-07-01 1989-12-19 Sony Corp
JPH01106328A (en) * 1987-10-19 1989-04-24 Konica Corp Magnetic recording medium
JPH0792912B2 (en) * 1987-10-19 1995-10-09 コニカ株式会社 Magnetic recording medium
JPH02197503A (en) * 1989-01-27 1990-08-06 Toda Kogyo Corp Magnetic acicular iron alloy powder for magnetic recording and its production

Also Published As

Publication number Publication date
JPS5853686B2 (en) 1983-11-30

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