JPS5763606A - Manufacture of magnetic powder - Google Patents

Manufacture of magnetic powder

Info

Publication number
JPS5763606A
JPS5763606A JP55137419A JP13741980A JPS5763606A JP S5763606 A JPS5763606 A JP S5763606A JP 55137419 A JP55137419 A JP 55137419A JP 13741980 A JP13741980 A JP 13741980A JP S5763606 A JPS5763606 A JP S5763606A
Authority
JP
Japan
Prior art keywords
feooh
gaseous mixture
air
magnetic
reduction
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
JP55137419A
Other languages
Japanese (ja)
Other versions
JPS5853045B2 (en
Inventor
Shintaro Suzuki
Hironori Sakumoto
Yoshimi Moriya
Yuichi Omote
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.)
Kanto Denka Kogyo Co Ltd
Original Assignee
Kanto Denka Kogyo 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 Kanto Denka Kogyo Co Ltd filed Critical Kanto Denka Kogyo Co Ltd
Priority to JP55137419A priority Critical patent/JPS5853045B2/en
Publication of JPS5763606A publication Critical patent/JPS5763606A/en
Publication of JPS5853045B2 publication Critical patent/JPS5853045B2/en
Expired legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To obtain ferromagnetic metallic powder for a magnetic recording medium with high coercive force and saturation magnetic flux density suitable especially for high density recording by treating β- or γ-FeOOH in an alkali soln. followed by filtration, washing drying and reduction.
CONSTITUTION: In an alkali soln. such as a 1W20N aqueous soln. of NaOH β- or γ-FeOOH is treated at 30W100°C. The treated material is filtered, washed, and dired. The resulting β- or γ-FeOOH is reduced at ≤600°C in a hydrongen atmosphere. A gaseous mixture consisting of 1% air and 99% N2 is fed to ferromagnetic metallic powder in the reducing vessel obtd. by the reduction, and the air content of the gaseous mixture is doubled at intervals of about 30min. After the passage 4W5hr the gaseous mixture is changed over to air, and magnetic iron powder is taken out of the reducing vessel. This magnetic iron powder is applicable to a megnetic tape and other magnetic recording medium.
COPYRIGHT: (C)1982,JPO&Japio
JP55137419A 1980-10-01 1980-10-01 Manufacturing method of magnetic powder Expired JPS5853045B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55137419A JPS5853045B2 (en) 1980-10-01 1980-10-01 Manufacturing method of magnetic powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55137419A JPS5853045B2 (en) 1980-10-01 1980-10-01 Manufacturing method of magnetic powder

Publications (2)

Publication Number Publication Date
JPS5763606A true JPS5763606A (en) 1982-04-17
JPS5853045B2 JPS5853045B2 (en) 1983-11-26

Family

ID=15198184

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55137419A Expired JPS5853045B2 (en) 1980-10-01 1980-10-01 Manufacturing method of magnetic powder

Country Status (1)

Country Link
JP (1) JPS5853045B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5932105A (en) * 1982-08-17 1984-02-21 Mitsui Toatsu Chem Inc Novel method of manufacturing ferromagnetic iron powder
JPS61229305A (en) * 1985-04-03 1986-10-13 Sony Corp Manufacture of magnetic metal powder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5932105A (en) * 1982-08-17 1984-02-21 Mitsui Toatsu Chem Inc Novel method of manufacturing ferromagnetic iron powder
JPH0454362B2 (en) * 1982-08-17 1992-08-31 Mitsui Toatsu Chemicals
JPS61229305A (en) * 1985-04-03 1986-10-13 Sony Corp Manufacture of magnetic metal powder

Also Published As

Publication number Publication date
JPS5853045B2 (en) 1983-11-26

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