JPS56104721A - Preparation of magnetic powder - Google Patents
Preparation of magnetic powderInfo
- Publication number
- JPS56104721A JPS56104721A JP527080A JP527080A JPS56104721A JP S56104721 A JPS56104721 A JP S56104721A JP 527080 A JP527080 A JP 527080A JP 527080 A JP527080 A JP 527080A JP S56104721 A JPS56104721 A JP S56104721A
- Authority
- JP
- Japan
- Prior art keywords
- solution
- ions
- salt
- aqueous solution
- cobalt hydroxide
- 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
- 229910006297 γ-Fe2O3 Inorganic materials 0.000 abstract 4
- 229910021503 Cobalt(II) hydroxide Inorganic materials 0.000 abstract 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract 3
- 239000007864 aqueous solution Substances 0.000 abstract 3
- ASKVAEGIVYSGNY-UHFFFAOYSA-L cobalt(ii) hydroxide Chemical compound [OH-].[OH-].[Co+2] ASKVAEGIVYSGNY-UHFFFAOYSA-L 0.000 abstract 3
- 239000000243 solution Substances 0.000 abstract 3
- 238000010438 heat treatment Methods 0.000 abstract 2
- 150000002500 ions Chemical class 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
- 239000002245 particle Substances 0.000 abstract 2
- 150000003839 salts Chemical class 0.000 abstract 2
- 239000002002 slurry Substances 0.000 abstract 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract 1
- 239000003513 alkali Substances 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 229940044175 cobalt sulfate Drugs 0.000 abstract 1
- 229910000361 cobalt sulfate Inorganic materials 0.000 abstract 1
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 abstract 1
- 229910001448 ferrous ion Inorganic materials 0.000 abstract 1
- 230000003993 interaction Effects 0.000 abstract 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 230000035515 penetration Effects 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 abstract 1
- 235000011121 sodium hydroxide Nutrition 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide [Fe2O3]
-
- 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
- G11B5/70652—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 gamma - Fe2 O3
- G11B5/70657—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 gamma - Fe2 O3 with a skin
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
- C01P2004/52—Particles with a specific particle size distribution highly monodisperse size distribution
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/42—Magnetic properties
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Compounds Of Iron (AREA)
Abstract
PURPOSE: To prepare magnetic powder for magnetic recording use, having stable coercive force and high stability under heat and pressure, by carrying out the reaction of a Co salt with an alkali in a hot slurry of γ-Fe2O3 dispersion, and if necessary, carrying out the addition of an aqueous solution of ferrous salt also under heating.
CONSTITUTION: γ-Fe2O3 powder is dispersed homogeneously in water to obtain a slurry, mixed with a solution of a Co salt, e.g. solution of cobalt sulfate, heated at room temp. to 100°C, added with an alkaline aqueous solution, e.g. solution of caustic soda to precipitate cobalt hydroxide, and then added with an aqueous solution of FeSO4 after cooling or under heating. The process promotes the penetration of Co ions into the γ-Fe2O3 core, facilitates the precipitation of coarser cobalt hydroxide particles, increases the mutual interaction of the Co ions with ferrous ions, and improves the coecive force of the product. Furthermore, the stability against heat and pressure can be improved because of the closer contact of the cobalt hydroxide to the surface of the γ-Fe2O3 particle.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP527080A JPS56104721A (en) | 1980-01-22 | 1980-01-22 | Preparation of magnetic powder |
| DE19813101834 DE3101834A1 (en) | 1980-01-22 | 1981-01-21 | Process for preparing magnetic powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP527080A JPS56104721A (en) | 1980-01-22 | 1980-01-22 | Preparation of magnetic powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56104721A true JPS56104721A (en) | 1981-08-20 |
Family
ID=11606530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP527080A Pending JPS56104721A (en) | 1980-01-22 | 1980-01-22 | Preparation of magnetic powder |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS56104721A (en) |
| DE (1) | DE3101834A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58161927A (en) * | 1982-03-19 | 1983-09-26 | Sony Corp | Manufacture of magnetic powder |
| JPS59138312A (en) * | 1983-01-28 | 1984-08-08 | Ishihara Sangyo Kaisha Ltd | Manufacture of magnetic ferrous oxide powder containing cobalt |
| US4551327A (en) * | 1982-07-16 | 1985-11-05 | Ishihara Sangyo Kaishi, Limited | Process for producing cobalt-and ferrous iron-containing ferromagnetic iron oxides |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3407722A1 (en) * | 1984-03-02 | 1985-09-05 | Basf Ag, 6700 Ludwigshafen | METHOD FOR PRODUCING COBALTIC, ISOTROPPER MAGNETIC IRON OXIDES |
| DE4319572A1 (en) * | 1993-06-14 | 1994-12-15 | Toda Kogyo Corp | Co-containing iron oxide pigments, processes for their preparation and magnetic media containing them |
-
1980
- 1980-01-22 JP JP527080A patent/JPS56104721A/en active Pending
-
1981
- 1981-01-21 DE DE19813101834 patent/DE3101834A1/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58161927A (en) * | 1982-03-19 | 1983-09-26 | Sony Corp | Manufacture of magnetic powder |
| JPH034489B2 (en) * | 1982-03-19 | 1991-01-23 | Sony Corp | |
| US4551327A (en) * | 1982-07-16 | 1985-11-05 | Ishihara Sangyo Kaishi, Limited | Process for producing cobalt-and ferrous iron-containing ferromagnetic iron oxides |
| JPS59138312A (en) * | 1983-01-28 | 1984-08-08 | Ishihara Sangyo Kaisha Ltd | Manufacture of magnetic ferrous oxide powder containing cobalt |
| JPH0425686B2 (en) * | 1983-01-28 | 1992-05-01 | Ishihara Sangyo Kaisha |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3101834A1 (en) | 1982-03-11 |
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