JPS5485198A - Production of ferromagnetic powder for magnetic recording - Google Patents
Production of ferromagnetic powder for magnetic recordingInfo
- Publication number
- JPS5485198A JPS5485198A JP15374577A JP15374577A JPS5485198A JP S5485198 A JPS5485198 A JP S5485198A JP 15374577 A JP15374577 A JP 15374577A JP 15374577 A JP15374577 A JP 15374577A JP S5485198 A JPS5485198 A JP S5485198A
- Authority
- JP
- Japan
- Prior art keywords
- salt
- soln
- alkali
- dispersion
- contg
- 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.)
- Pending
Links
- 230000005294 ferromagnetic effect Effects 0.000 title abstract 2
- 239000000843 powder Substances 0.000 title abstract 2
- 230000005291 magnetic effect Effects 0.000 title 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 abstract 4
- 150000003839 salts Chemical class 0.000 abstract 4
- 239000013078 crystal Substances 0.000 abstract 3
- 239000006185 dispersion Substances 0.000 abstract 3
- 239000003513 alkali Substances 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 abstract 2
- 239000006247 magnetic powder Substances 0.000 abstract 2
- 229910017061 Fe Co Inorganic materials 0.000 abstract 1
- 239000002202 Polyethylene glycol Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 229920001223 polyethylene glycol Polymers 0.000 abstract 1
- 239000002904 solvent Substances 0.000 abstract 1
Landscapes
- Hard Magnetic Materials (AREA)
- Compounds Of Iron (AREA)
Abstract
PURPOSE: To obtain the title product which is hardly demagnetized by heating or pressurization, resulting in little transfer, by dispersing crystal nuclei made of Co- dissolved iron oxide magnetic powder obtd. by a specific method in an aq. soln. contg. a ferrous salt and a Co salt; adding an aq. soln. of alkali of a limited concn.; and heating the alkali-added dispersion to carry out epitaxial growth.
CONSTITUTION: A sol. Co salt such as CoCl2.6H2O is dissolved in an org. solvent such as polyethylene glycol, and ferromagnetic Fe3O4 powder is dispersed in the soln. The dispersion is then heat treated to uniformly disperse Co in the Fe3O4 particles, thus obtaining Co-dissolved iron oxide magnetic powder. The resulting crystal nuclei are dispersed in an ag. soln. contg. a ferrous salt and a Co salt. After adding more than one equivalent of alkali to the salts, the dispersion is heated pref. to 150W300°C to epitaxial grow Fe-Co oxide-based crystals on the unclei.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15374577A JPS5485198A (en) | 1977-12-20 | 1977-12-20 | Production of ferromagnetic powder for magnetic recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15374577A JPS5485198A (en) | 1977-12-20 | 1977-12-20 | Production of ferromagnetic powder for magnetic recording |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5485198A true JPS5485198A (en) | 1979-07-06 |
Family
ID=15569176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15374577A Pending JPS5485198A (en) | 1977-12-20 | 1977-12-20 | Production of ferromagnetic powder for magnetic recording |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5485198A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6197805A (en) * | 1984-10-18 | 1986-05-16 | バスフ アクチェン ゲゼルシャフト | Ferri magnetic particle and making thereof |
| CN104986804A (en) * | 2015-08-12 | 2015-10-21 | 兰州大学 | Method for preparing gamma-Fe2O3 magnetic nanoparticles |
-
1977
- 1977-12-20 JP JP15374577A patent/JPS5485198A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6197805A (en) * | 1984-10-18 | 1986-05-16 | バスフ アクチェン ゲゼルシャフト | Ferri magnetic particle and making thereof |
| CN104986804A (en) * | 2015-08-12 | 2015-10-21 | 兰州大学 | Method for preparing gamma-Fe2O3 magnetic nanoparticles |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS5792527A (en) | Preparation of needle-like ferric oxide | |
| JPS53113754A (en) | Preparation of ferromagnetic powder | |
| JPS5485198A (en) | Production of ferromagnetic powder for magnetic recording | |
| JPS56112449A (en) | Treatment of amorphous magnetic alloy material | |
| JPS6479099A (en) | Production of superconductive material | |
| JPS5684439A (en) | Cobalt based amorphous alloy having small magnetic strain and high permeability | |
| JPS54106895A (en) | Ferromagnetic powder | |
| JPS5556019A (en) | Production of ferromagnetic powder | |
| JPS56257A (en) | Amorphous alloy | |
| JPS5752106A (en) | Magnetic powder for magnetic recording | |
| JPS56134522A (en) | Preparation of magnetic powder for magnetic recording use | |
| JPS54131527A (en) | High-permeability amorphous alloy production | |
| JPS5562105A (en) | Production of magnetic alloy powder | |
| JPS57149442A (en) | Amorphous alloy having high saturated magnetic flux density and high permeability and preparation thereof | |
| JPS5433257A (en) | Production of ferromagnetic powder | |
| JPS5583207A (en) | Preparation of ferromagnetic powder | |
| JPS5556016A (en) | Production of ferromagnetic powder | |
| JPS5547227A (en) | Production of magnetic powder | |
| JPS5635705A (en) | Production of magnetic alloy powder | |
| JPS5756326A (en) | Manufacture of magnetic powder for magnetic recording medium | |
| JPS5433256A (en) | Treating method of magnetic powder | |
| JPS57114646A (en) | Heat treatment of amorphous magnetic alloy | |
| JPS5613409A (en) | Manufacture of ferromagnetic alloy powder | |
| JPS5275700A (en) | Production of magnetic iron oxide powder including co | |
| JPS54128499A (en) | Treatimg method for cobalt-containing iron oxide magnetic powder |