JPS5756331A - Hexagonal ferrite powder - Google Patents

Hexagonal ferrite powder

Info

Publication number
JPS5756331A
JPS5756331A JP55132150A JP13215080A JPS5756331A JP S5756331 A JPS5756331 A JP S5756331A JP 55132150 A JP55132150 A JP 55132150A JP 13215080 A JP13215080 A JP 13215080A JP S5756331 A JPS5756331 A JP S5756331A
Authority
JP
Japan
Prior art keywords
ferrite
bao
ions
hexagonal ferrite
rapidly
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
JP55132150A
Other languages
Japanese (ja)
Other versions
JPS6353134B2 (en
Inventor
Osamu Kubo
Tsutomu Nomura
Tatsumi Maeda
Tadashi Ido
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 JP55132150A priority Critical patent/JPS5756331A/en
Publication of JPS5756331A publication Critical patent/JPS5756331A/en
Publication of JPS6353134B2 publication Critical patent/JPS6353134B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To obtain hexagonal ferrite for a magnetic recording medium with high recording density by mixing a glass forming substance, basic components for ferrite and a substituting component, melting the mixture, cooling melt very rapidly to form an amorphous body, heat treating the body to deposit fine ferrite particles, and removing the glassy substance with dil. acid.
CONSTITUTION: In order to substitute Co or Ti ions for part of Fe ions in magnetoplumbite type Ba ferrite and to use B2O3-BaO as a glass forming substance, Fe2O3, TiO2, B2O3, BaO and CoO are mixed as starting materials, heated, and melted. The melt is cooled very rapidly by spraying on twin rolls rotating a high speed to form an amorphous ribbon. This ribbon is heated to deposit fine Ba ferrite particles, and the glass component is removed to ≤0.3% by immersion in a 20% acetic acid soln. at 80°C. The resulting ferrite is washed and dried to manufacture hexagonal ferrite powder as a magnetic recording medium with high recording density.
COPYRIGHT: (C)1982,JPO&Japio
JP55132150A 1980-09-22 1980-09-22 Hexagonal ferrite powder Granted JPS5756331A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55132150A JPS5756331A (en) 1980-09-22 1980-09-22 Hexagonal ferrite powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55132150A JPS5756331A (en) 1980-09-22 1980-09-22 Hexagonal ferrite powder

Publications (2)

Publication Number Publication Date
JPS5756331A true JPS5756331A (en) 1982-04-03
JPS6353134B2 JPS6353134B2 (en) 1988-10-21

Family

ID=15074521

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55132150A Granted JPS5756331A (en) 1980-09-22 1980-09-22 Hexagonal ferrite powder

Country Status (1)

Country Link
JP (1) JPS5756331A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6272529A (en) * 1985-09-27 1987-04-03 Toshiba Glass Co Ltd Production of magnetic powder
JPH0379001A (en) * 1989-08-22 1991-04-04 Toshiba Glass Co Ltd Hexagonal ferrite magnetic powder
JP2012238722A (en) * 2011-05-11 2012-12-06 Dowa Electronics Materials Co Ltd Hexagonal ferrite aggregated particles and magnetic recording medium using the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04119417A (en) * 1990-09-11 1992-04-20 Omron Corp Coordinate input device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4822265A (en) * 1971-07-26 1973-03-20

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4822265A (en) * 1971-07-26 1973-03-20

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6272529A (en) * 1985-09-27 1987-04-03 Toshiba Glass Co Ltd Production of magnetic powder
JPH0348139B2 (en) * 1985-09-27 1991-07-23 Toshiba Glass Kk
JPH0379001A (en) * 1989-08-22 1991-04-04 Toshiba Glass Co Ltd Hexagonal ferrite magnetic powder
JP2012238722A (en) * 2011-05-11 2012-12-06 Dowa Electronics Materials Co Ltd Hexagonal ferrite aggregated particles and magnetic recording medium using the same

Also Published As

Publication number Publication date
JPS6353134B2 (en) 1988-10-21

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