JPS5756904A - Magnetic powder for magnetic recording medium - Google Patents
Magnetic powder for magnetic recording mediumInfo
- Publication number
- JPS5756904A JPS5756904A JP55132124A JP13212480A JPS5756904A JP S5756904 A JPS5756904 A JP S5756904A JP 55132124 A JP55132124 A JP 55132124A JP 13212480 A JP13212480 A JP 13212480A JP S5756904 A JPS5756904 A JP S5756904A
- Authority
- JP
- Japan
- Prior art keywords
- particles
- precipitate
- sio2
- pure water
- grain size
- 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
- 239000006247 magnetic powder Substances 0.000 title abstract 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 6
- 239000002245 particle Substances 0.000 abstract 5
- 229910000859 α-Fe Inorganic materials 0.000 abstract 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract 3
- 229910052681 coesite Inorganic materials 0.000 abstract 3
- 229910052906 cristobalite Inorganic materials 0.000 abstract 3
- 239000002244 precipitate Substances 0.000 abstract 3
- 239000000377 silicon dioxide Substances 0.000 abstract 3
- 235000012239 silicon dioxide Nutrition 0.000 abstract 3
- 229910052682 stishovite Inorganic materials 0.000 abstract 3
- 229910052905 tridymite Inorganic materials 0.000 abstract 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 3
- 239000011230 binding agent Substances 0.000 abstract 2
- 229910020517 Co—Ti Inorganic materials 0.000 abstract 1
- 229910003074 TiCl4 Inorganic materials 0.000 abstract 1
- PWHCIQQGOQTFAE-UHFFFAOYSA-L barium chloride dihydrate Chemical compound O.O.[Cl-].[Cl-].[Ba+2] PWHCIQQGOQTFAE-UHFFFAOYSA-L 0.000 abstract 1
- NQXWGWZJXJUMQB-UHFFFAOYSA-K iron trichloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].Cl[Fe+]Cl NQXWGWZJXJUMQB-UHFFFAOYSA-K 0.000 abstract 1
- 238000003756 stirring Methods 0.000 abstract 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
- G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
- G11B5/70642—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
- G11B5/70678—Ferrites
Landscapes
- Hard Magnetic Materials (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
PURPOSE:To remarkably improve the dispersibility in a binder by adhering SiO2 to the surface of microminiature particles of hexagonal ferrite having mean grain size of 0.01-0.3mum. CONSTITUTION:0.014mol of BaCl2.2H2O, 0.13mol of FeCl3.6H2O, 0.01mol of TiCl4, and 0.01mol of CoCl2.6H2O are dissolved in 200ml of pure water, the solution is then mixed with solution of 40ml of pure water, 50g of NaOH and 12.5g of NaCO3, and co-precipitate is prepared. After the co-precipitate is washed and dried, it is heat treated at 900 deg.C for 2hr to prepare Co-Ti substituted Ba ferrite particle group having mean grain size of 0.12mum, and is suspended at 100g in 2l of pure water. The solution obtained by suspending 1g of SiO2 particles having mean grain size of 0.013mum is filled while stirring it, and the precipitate is dried. The magnetic powder adhered with the SiO2 on the surfaces of the ferrite particles in this manner has extremley good dispersability in the binder. Accordingly, the degree of orientation of the ferrite particles can be improved, and the degree of gloss can also be improved, thereby obtaining magnetic recording medium of high quality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55132124A JPS5756904A (en) | 1980-09-22 | 1980-09-22 | Magnetic powder for magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55132124A JPS5756904A (en) | 1980-09-22 | 1980-09-22 | Magnetic powder for magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5756904A true JPS5756904A (en) | 1982-04-05 |
Family
ID=15073963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55132124A Pending JPS5756904A (en) | 1980-09-22 | 1980-09-22 | Magnetic powder for magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5756904A (en) |
Cited By (6)
| 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 |
| US4529524A (en) * | 1983-12-26 | 1985-07-16 | Toda Kogyo Corp. | Process for producing plate-like barium ferrite particles for magnetic recording |
| US5284716A (en) * | 1989-01-19 | 1994-02-08 | Konica Corporation | Magnetic recording medium |
| JPH06290449A (en) * | 1992-04-28 | 1994-10-18 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
| US5484545A (en) * | 1992-11-11 | 1996-01-16 | Toda Kogyo Corporation | Magnetic particles for magnetic recording medium and process for producing the same |
| WO2002031060A1 (en) * | 2000-10-09 | 2002-04-18 | Bayer Aktiengesellschaft | Composite particles |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5583208A (en) * | 1978-12-20 | 1980-06-23 | Hitachi Maxell Ltd | Preparation of ferromagnetic powder |
| JPS5586103A (en) * | 1978-12-22 | 1980-06-28 | Toshiba Corp | High density magnetic recording unit |
-
1980
- 1980-09-22 JP JP55132124A patent/JPS5756904A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5583208A (en) * | 1978-12-20 | 1980-06-23 | Hitachi Maxell Ltd | Preparation of ferromagnetic powder |
| JPS5586103A (en) * | 1978-12-22 | 1980-06-28 | Toshiba Corp | High density magnetic recording unit |
Cited By (10)
| 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 |
| US4698182A (en) * | 1983-10-12 | 1987-10-06 | Toda Kogyo Corp. | Hexagonal plate-like barium ferrite particles for magnetic recording and process for producing the same |
| US4529524A (en) * | 1983-12-26 | 1985-07-16 | Toda Kogyo Corp. | Process for producing plate-like barium ferrite particles for magnetic recording |
| US5284716A (en) * | 1989-01-19 | 1994-02-08 | Konica Corporation | Magnetic recording medium |
| JPH06290449A (en) * | 1992-04-28 | 1994-10-18 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
| US5484545A (en) * | 1992-11-11 | 1996-01-16 | Toda Kogyo Corporation | Magnetic particles for magnetic recording medium and process for producing the same |
| US5543069A (en) * | 1992-11-11 | 1996-08-06 | Toda Kogyo Corporation | Magnetic particles for magnetic recording medium and process for producing the same |
| WO2002031060A1 (en) * | 2000-10-09 | 2002-04-18 | Bayer Aktiengesellschaft | Composite particles |
| US6565973B2 (en) | 2000-10-09 | 2003-05-20 | Bayer Aktiengesellschaft | Composite particles |
| JP2004511612A (en) * | 2000-10-09 | 2004-04-15 | バイエル アクチェンゲゼルシャフト | Composite particles |
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