JPS6423415A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS6423415A JPS6423415A JP62179141A JP17914187A JPS6423415A JP S6423415 A JPS6423415 A JP S6423415A JP 62179141 A JP62179141 A JP 62179141A JP 17914187 A JP17914187 A JP 17914187A JP S6423415 A JPS6423415 A JP S6423415A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- metal powder
- iron
- specified
- acicular
- 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
- 230000005291 magnetic effect Effects 0.000 title abstract 4
- 239000000843 powder Substances 0.000 abstract 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 8
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 abstract 6
- 239000002184 metal Substances 0.000 abstract 6
- 229910052751 metal Inorganic materials 0.000 abstract 6
- 229910052742 iron Inorganic materials 0.000 abstract 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 2
- 239000011230 binding agent Substances 0.000 abstract 2
- 230000005294 ferromagnetic effect Effects 0.000 abstract 2
- 229910052760 oxygen Inorganic materials 0.000 abstract 2
- 239000001301 oxygen Substances 0.000 abstract 2
- 239000012299 nitrogen atmosphere Substances 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 229910003145 α-Fe2O3 Inorganic materials 0.000 abstract 1
- 229910006540 α-FeOOH Inorganic materials 0.000 abstract 1
Abstract
PURPOSE:To enhance C/N and to improve oxidation stability by consisting ferromagnetic metal powder essentially consisting of iron specified in crystallite size and specifying the atomic number ratio of oxygen to iron at the time of providing a magnetic layer formed by dispersing the metal powder into a binder on a nonmagnetic base. CONSTITUTION:The metal powder essentially consisting of the iron specified in the crystallite size of the metal powder to 250Angstrom is used and the atomic number ratio of the oxygen to the iron surface is specified to 1.6-3.0 at the time of providing the magnetic layer formed by dispersing the ferromagnetic metal powder in the binder on the nonmagnetic base. For example, acicular alpha-FeOOH (0.4mum length and 20 acicular ratio) which contains 5atom.% Ni and is deposited with 4atom.% Si is heated and dehydrated at 500 deg.C in an N2 atmosphere to form the acicular alpha-Fe2O3 powder and thereafter, the powder is reduced for 6hr at 470 deg.C in gaseous H2 flow, by which the magnetic metal powder is obtd. The powder is thereafter immersed in a toluene in a manner as not to be brought into contact with the air and the toluene is evaporated at 40 deg.C in the air. After the powder is cooled, the concn. of O2 is increased to 30% and the powder is held therein for 3hr.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62179141A JPH0668829B2 (en) | 1987-07-20 | 1987-07-20 | Magnetic recording medium |
| US07/195,224 US4959263A (en) | 1987-05-18 | 1988-05-18 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62179141A JPH0668829B2 (en) | 1987-07-20 | 1987-07-20 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6423415A true JPS6423415A (en) | 1989-01-26 |
| JPH0668829B2 JPH0668829B2 (en) | 1994-08-31 |
Family
ID=16060694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62179141A Expired - Fee Related JPH0668829B2 (en) | 1987-05-18 | 1987-07-20 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0668829B2 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5254998A (en) * | 1975-10-31 | 1977-05-04 | Sony Corp | Oxidation treatment process of metallic magnetic powder for magnetic r ecording medium |
| JPS5789401A (en) * | 1980-11-25 | 1982-06-03 | Sony Corp | Preparation of acicular magnetic metallic particle |
| JPS5975608A (en) * | 1982-10-25 | 1984-04-28 | Fuji Photo Film Co Ltd | Ferromagnetic powder and manufacture thereof |
| JPS59151337A (en) * | 1983-02-17 | 1984-08-29 | Tdk Corp | Magnetic recording medium |
| JPS6122428A (en) * | 1984-06-20 | 1986-01-31 | バイエル・アクチエンゲゼルシヤフト | Manufacture and use of ferromagnetic pigment |
-
1987
- 1987-07-20 JP JP62179141A patent/JPH0668829B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5254998A (en) * | 1975-10-31 | 1977-05-04 | Sony Corp | Oxidation treatment process of metallic magnetic powder for magnetic r ecording medium |
| JPS5789401A (en) * | 1980-11-25 | 1982-06-03 | Sony Corp | Preparation of acicular magnetic metallic particle |
| JPS5975608A (en) * | 1982-10-25 | 1984-04-28 | Fuji Photo Film Co Ltd | Ferromagnetic powder and manufacture thereof |
| JPS59151337A (en) * | 1983-02-17 | 1984-08-29 | Tdk Corp | Magnetic recording medium |
| JPS6122428A (en) * | 1984-06-20 | 1986-01-31 | バイエル・アクチエンゲゼルシヤフト | Manufacture and use of ferromagnetic pigment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0668829B2 (en) | 1994-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS5418709A (en) | Production of magnetic recording media | |
| US4318735A (en) | Process for preparing magnetic particles with metallic region therein, and magnetic particles prepared by the process | |
| JPS5759304A (en) | Magnetic recording material and its manufacture | |
| JPS6423415A (en) | Magnetic recording medium | |
| JPS56156706A (en) | Manufacture of magnetic metallic powder | |
| JPS57140307A (en) | Manufacture of metallic nitride powder for magnetic recording | |
| JPS5752106A (en) | Magnetic powder for magnetic recording | |
| JPS5698401A (en) | Ferromagnetic metal powder with improved oxidation stability and preparation thereof | |
| JPS579802A (en) | Metallic magnetic powder and its manufacture | |
| JPS56203A (en) | Manufacture of alloy magnetic powder composed primarily of metallic iron or iron | |
| JPS5472715A (en) | High permeability amorphous alloy | |
| JPS5789401A (en) | Preparation of acicular magnetic metallic particle | |
| JPS5565405A (en) | Ferromagnetic metal powder for magnetic recording medium | |
| JPS6415911A (en) | Manufacture of oxide perpendicularly magnetizable film | |
| JPS56114833A (en) | Production of fine particle of iron compound for magnetic recording | |
| Hoselitz | Magnetic Iron--Silicon--Boron Metallic Glasses | |
| JPH0143683B2 (en) | ||
| JPS5341202A (en) | Novel magnetic recording medium | |
| JPS5539659A (en) | Treating method of magnetic powder | |
| JP3242102B2 (en) | Magnetic powder and method for producing the same | |
| JPS5384197A (en) | Manufacturing method of magnetic thin film | |
| Matsunaga et al. | Annealing effect on oxidized alpha-Fe particles | |
| JPS5218302A (en) | Magnetic sheet recording/playing method | |
| JPS55167139A (en) | Manufacture of oxide magnetic thin film | |
| JPS6479918A (en) | Magnetic recording medium and its production |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |