JPS5756331A - Hexagonal ferrite powder - Google Patents
Hexagonal ferrite powderInfo
- 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
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
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04119417A (en) * | 1990-09-11 | 1992-04-20 | Omron Corp | Coordinate input device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4822265A (en) * | 1971-07-26 | 1973-03-20 |
-
1980
- 1980-09-22 JP JP55132150A patent/JPS5756331A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4822265A (en) * | 1971-07-26 | 1973-03-20 |
Cited By (4)
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 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5756329A (en) | Manufacture of magnetic powder for magnetic recording medium | |
JPS56169128A (en) | Manufacture of magnetic powder for magnetic recording | |
JPS5667904A (en) | Preparation method of megnetic powder for high density magnetic recording | |
US4690768A (en) | Process for the preparation of ferrite magnetic particulate for magnetic recording | |
US4493779A (en) | Process for the preparation of ferrite magnetic particulate for magnetic recording | |
JPH0239844B2 (en) | ||
JPS5756331A (en) | Hexagonal ferrite powder | |
JPS5756328A (en) | Manufacture of magnetic powder for magnetic recording medium | |
JPS57185957A (en) | Amorphous alloy for iron core having high saturated magnetic flux density | |
JPS5756326A (en) | Manufacture of magnetic powder for magnetic recording medium | |
JPS5756327A (en) | Manufacture of magnetic powder for magnetic recording medium | |
JPS60210802A (en) | Manufacture of magnetic fine particle | |
JPS5654253A (en) | Glaze composition for alumina substrate | |
JPS5690505A (en) | Manufacture of magnetic powder for high density magnetic recording | |
JPS56134522A (en) | Preparation of magnetic powder for magnetic recording use | |
JPS6121921A (en) | Preparation of magnetic powder | |
KR930011236B1 (en) | Magnetic materials | |
DE1596977C (en) | Glass containing lithium ferrite crystals of relatively uniform size and process for making the same | |
JPS60229307A (en) | Manufacture of magnetic powder for magnetic recording | |
JPS61236104A (en) | Hexagonal crystal ferrite for magnetic recording medium and manufacture thereof | |
JPH02252209A (en) | Manufacture of magnetic powder | |
KR960000501B1 (en) | Method of preparing high density magnetic hexagonal ferrite powder | |
SU550352A1 (en) | Ferromagnetic glass | |
JPS5756325A (en) | Manufacture if nagbetic powder for magnetic recording medium | |
JPH0412604B2 (en) |