JPS5756327A - Manufacture of magnetic powder for magnetic recording medium - Google Patents

Manufacture of magnetic powder for magnetic recording medium

Info

Publication number
JPS5756327A
JPS5756327A JP13212680A JP13212680A JPS5756327A JP S5756327 A JPS5756327 A JP S5756327A JP 13212680 A JP13212680 A JP 13212680A JP 13212680 A JP13212680 A JP 13212680A JP S5756327 A JPS5756327 A JP S5756327A
Authority
JP
Japan
Prior art keywords
particles
ferrite
hexagonal system
composition
recording medium
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
JP13212680A
Other languages
Japanese (ja)
Other versions
JPH0122205B2 (en
Inventor
Tadashi Ido
Osamu Kubo
Tsutomu Nomura
Tatsumi Maeda
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP13212680A priority Critical patent/JPS5756327A/en
Publication of JPS5756327A publication Critical patent/JPS5756327A/en
Publication of JPH0122205B2 publication Critical patent/JPH0122205B2/ja
Granted legal-status Critical Current

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  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)

Abstract

PURPOSE: To manufacture magnetic powder for a magnetic recording medium with high recording density by acid-treating a hexagonal system ferrite composition with low coercive force contg. other atoms substituted for part of the constituent molecules, adding fine SiO2 particles, and carring out dispersion and washing.
CONSTITUTION: As starting materials for hexagonal system ferrite, a substituting component for substituting for part of the constituent atoms of the ferrite to reduce the coercive force iHc and a vitrifying composition, Fe2O3, TiO2, CoCO3, BaCO3 and H3BO4 are mixed to prepare a composition consisting of 17.4% B2O3, 48.2% BaO, 30.5% Fe2O3, 2.0% TiO2 and 1.9%CoO. This melt is converted into an amorphous body by very rapid cooling, and the body is heat treated to deposit ferrite particles. After removing the glassy substance by dissolution in acetic acid, the particles are washed, and 0.5% fine SiO2 particles are added. They are then washed with an ultrasonic washing machine and dried to obtain SiO2-stuck hexagonal system fine ferrite particles.
COPYRIGHT: (C)1982,JPO&Japio
JP13212680A 1980-09-22 1980-09-22 Manufacture of magnetic powder for magnetic recording medium Granted JPS5756327A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13212680A JPS5756327A (en) 1980-09-22 1980-09-22 Manufacture of magnetic powder for magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13212680A JPS5756327A (en) 1980-09-22 1980-09-22 Manufacture of magnetic powder for magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS5756327A true JPS5756327A (en) 1982-04-03
JPH0122205B2 JPH0122205B2 (en) 1989-04-25

Family

ID=15074005

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13212680A Granted JPS5756327A (en) 1980-09-22 1980-09-22 Manufacture of magnetic powder for magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS5756327A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6081804A (en) * 1983-10-12 1985-05-09 Toda Kogyo Corp Hexagonal plate type ba ferrite fine-grained powder for magnetic recording and manufacture thereof
JPS60262403A (en) * 1984-06-08 1985-12-25 Toshiba Glass Co Ltd Manufacture of magnetic powder

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6081804A (en) * 1983-10-12 1985-05-09 Toda Kogyo Corp Hexagonal plate type ba ferrite fine-grained powder for magnetic recording and manufacture thereof
JPH0578161B2 (en) * 1983-10-12 1993-10-28 Toda Kogyo Corp
JPS60262403A (en) * 1984-06-08 1985-12-25 Toshiba Glass Co Ltd Manufacture of magnetic powder
JPH0412604B2 (en) * 1984-06-08 1992-03-05 Toshiba Glass Kk

Also Published As

Publication number Publication date
JPH0122205B2 (en) 1989-04-25

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