DE2305153A1 - Verfahren zur herstellung eines nadelfoermigen magnetischen puders fuer die herstellung von magnetbaendern - Google Patents
Verfahren zur herstellung eines nadelfoermigen magnetischen puders fuer die herstellung von magnetbaendernInfo
- Publication number
- DE2305153A1 DE2305153A1 DE19732305153 DE2305153A DE2305153A1 DE 2305153 A1 DE2305153 A1 DE 2305153A1 DE 19732305153 DE19732305153 DE 19732305153 DE 2305153 A DE2305153 A DE 2305153A DE 2305153 A1 DE2305153 A1 DE 2305153A1
- Authority
- DE
- Germany
- Prior art keywords
- cobalt
- iron
- modified
- ions
- needle
- 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.)
- Ceased
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 26
- 239000006247 magnetic powder Substances 0.000 title claims description 5
- 239000000843 powder Substances 0.000 claims description 62
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 60
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 claims description 43
- 229910052742 iron Inorganic materials 0.000 claims description 30
- 230000003647 oxidation Effects 0.000 claims description 26
- 238000007254 oxidation reaction Methods 0.000 claims description 26
- -1 iron ions Chemical class 0.000 claims description 22
- 229910017052 cobalt Inorganic materials 0.000 claims description 21
- 239000010941 cobalt Substances 0.000 claims description 21
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 20
- QVYYOKWPCQYKEY-UHFFFAOYSA-N [Fe].[Co] Chemical compound [Fe].[Co] QVYYOKWPCQYKEY-UHFFFAOYSA-N 0.000 claims description 19
- 239000000725 suspension Substances 0.000 claims description 18
- 229910001429 cobalt ion Inorganic materials 0.000 claims description 17
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 17
- 229910000531 Co alloy Inorganic materials 0.000 claims description 16
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 16
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 14
- 229910052598 goethite Inorganic materials 0.000 claims description 8
- 239000004575 stone Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 150000001868 cobalt Chemical class 0.000 claims description 4
- 150000004679 hydroxides Chemical class 0.000 claims description 4
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims 1
- 239000007858 starting material Substances 0.000 claims 1
- 239000000696 magnetic material Substances 0.000 description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 239000002245 particle Substances 0.000 description 11
- 230000006698 induction Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 239000000243 solution Substances 0.000 description 8
- 229910002588 FeOOH Inorganic materials 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 6
- 229910021503 Cobalt(II) hydroxide Inorganic materials 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 description 5
- ASKVAEGIVYSGNY-UHFFFAOYSA-L cobalt(ii) hydroxide Chemical compound [OH-].[OH-].[Co+2] ASKVAEGIVYSGNY-UHFFFAOYSA-L 0.000 description 5
- 235000014413 iron hydroxide Nutrition 0.000 description 5
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 5
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 4
- 229910017061 Fe Co Inorganic materials 0.000 description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- 239000012670 alkaline solution Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 description 2
- 229910001981 cobalt nitrate Inorganic materials 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 150000002505 iron Chemical class 0.000 description 2
- 229910000358 iron sulfate Inorganic materials 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- 235000006408 oxalic acid Nutrition 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 241000036316 Callitropsis Species 0.000 description 1
- 229910020598 Co Fe Inorganic materials 0.000 description 1
- 229910002519 Co-Fe Inorganic materials 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910000361 cobalt sulfate Inorganic materials 0.000 description 1
- 229940044175 cobalt sulfate Drugs 0.000 description 1
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/065—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder obtained by a reduction
-
- 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
- G11B5/70668—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 containing a dopant
- G11B5/70673—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 containing a dopant containing Co
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/50—Solid solutions
- C01P2002/52—Solid solutions containing elements as dopants
- C01P2002/54—Solid solutions containing elements as dopants one element only
-
- 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
- C01P2004/54—Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension
-
- 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)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inorganic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Magnetic Record Carriers (AREA)
- Paints Or Removers (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Compounds Of Iron (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1294572A JPS5529577B2 (enrdf_load_html_response) | 1972-02-04 | 1972-02-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2305153A1 true DE2305153A1 (de) | 1973-08-16 |
Family
ID=11819406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19732305153 Ceased DE2305153A1 (de) | 1972-02-04 | 1973-02-02 | Verfahren zur herstellung eines nadelfoermigen magnetischen puders fuer die herstellung von magnetbaendern |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5529577B2 (enrdf_load_html_response) |
| DE (1) | DE2305153A1 (enrdf_load_html_response) |
| FR (1) | FR2170278B1 (enrdf_load_html_response) |
| GB (1) | GB1418733A (enrdf_load_html_response) |
| IT (1) | IT978774B (enrdf_load_html_response) |
| NL (1) | NL7301614A (enrdf_load_html_response) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2510799A1 (de) * | 1974-03-12 | 1975-09-18 | Fuji Photo Film Co Ltd | Magnetisches eisenoxid und verfahren zu dessen herstellung |
| DE2738421A1 (de) * | 1976-08-27 | 1978-03-02 | Victor Company Of Japan | Magnetisches metallisches pulver und dessen verwendung |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6011446B2 (ja) * | 1976-07-15 | 1985-03-26 | 日立マクセル株式会社 | 強磁性金属粉末の製造法 |
| JPS53127400A (en) * | 1977-04-13 | 1978-11-07 | Nippon Telegr & Teleph Corp <Ntt> | Production of goethite |
| JPS5562105A (en) * | 1978-10-30 | 1980-05-10 | Hitachi Maxell Ltd | Production of magnetic alloy powder |
| JPS5571002A (en) * | 1978-11-24 | 1980-05-28 | Hitachi Ltd | Manufacture of magnetic powder for magnetic recording medium |
| JPS5573803A (en) * | 1978-11-25 | 1980-06-03 | Hitachi Maxell Ltd | Production of magnetic alloy powder |
| JPS583250A (ja) * | 1981-06-30 | 1983-01-10 | Toshiba Corp | 半導体装置の製造方法 |
| AU548794B2 (en) | 1981-07-28 | 1986-01-02 | Ishihara Sangyo Kaisha Ltd. | Process for producing cobalt containing ferromagnetic iron oxides |
| JPS5869964U (ja) * | 1981-11-06 | 1983-05-12 | 日本電気株式会社 | 太陽電池パネル |
| JPS62127577U (enrdf_load_html_response) * | 1986-02-06 | 1987-08-13 | ||
| JPH01257309A (ja) * | 1988-04-07 | 1989-10-13 | Tdk Corp | 磁気記録媒体用磁性粉末とその製造方法 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3117933A (en) * | 1959-06-12 | 1964-01-14 | Bayer Ag | Process for the production of needleshaped, cobalt-containing gamma-ferric oxide crystalline particles |
| DE1247026B (de) * | 1965-01-09 | 1967-08-10 | Basf Ag | Verfahren zur Herstellung von fuer die Herstellung von Magnetogrammtraegern geeigneten, magnetisierbaren metallischen Teilchen |
| GB1212126A (en) * | 1967-08-07 | 1970-11-11 | Toda Kogyo Kabushiki Kaisha | A METHOD OF MANUFACTURING gamma-Fe2O3 PARTICLES |
-
1972
- 1972-02-04 JP JP1294572A patent/JPS5529577B2/ja not_active Expired
-
1973
- 1973-01-31 GB GB479473A patent/GB1418733A/en not_active Expired
- 1973-02-02 IT IT1998973A patent/IT978774B/it active
- 1973-02-02 DE DE19732305153 patent/DE2305153A1/de not_active Ceased
- 1973-02-05 FR FR7304009A patent/FR2170278B1/fr not_active Expired
- 1973-02-05 NL NL7301614A patent/NL7301614A/xx not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2510799A1 (de) * | 1974-03-12 | 1975-09-18 | Fuji Photo Film Co Ltd | Magnetisches eisenoxid und verfahren zu dessen herstellung |
| DE2738421A1 (de) * | 1976-08-27 | 1978-03-02 | Victor Company Of Japan | Magnetisches metallisches pulver und dessen verwendung |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2170278A1 (enrdf_load_html_response) | 1973-09-14 |
| IT978774B (it) | 1974-09-20 |
| NL7301614A (enrdf_load_html_response) | 1973-08-07 |
| FR2170278B1 (enrdf_load_html_response) | 1978-04-21 |
| GB1418733A (en) | 1975-12-24 |
| JPS4882395A (enrdf_load_html_response) | 1973-11-02 |
| JPS5529577B2 (enrdf_load_html_response) | 1980-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE1592470C3 (de) | Verfahren zur Herstellung von Ferritpulvern | |
| DE2130921C3 (de) | Verfahren zur Herstellung von Pulver aus metallischem Eisen mit Kobalt und/oder Nickel für magnetische Aufzeichnungsbänder | |
| EP0015485B1 (de) | Ferromagnetisches, im wesentlichen aus Eisen bestehendes Metallpulver und Verfahren zu dessen Herstellung | |
| DE69526313T2 (de) | Magnetische, spindelförmige Legierungsteilchen mit Kobalt und Eisen als Hauptbestandteilen sowie Verfahren zu deren Herstellung | |
| DE2326258C2 (de) | Magnetischer Aufzeichnungsträger | |
| DE2434096C2 (de) | Nadelförmige, vorwiegend aus Eisen bestehende ferromagnetische Metallteilchen und Verfahren zu ihrer Herstellung | |
| EP0014902B1 (de) | Verfahren zur Herstellung von nadelförmigem kobalthaltigem magnetischem Eisenoxid | |
| DE2923152C2 (enrdf_load_html_response) | ||
| DE2305153A1 (de) | Verfahren zur herstellung eines nadelfoermigen magnetischen puders fuer die herstellung von magnetbaendern | |
| EP0014903B1 (de) | Verfahren zur Herstellung von nadelförmigem kobalthaltigem magnetischem Eisenoxid | |
| DE3700943A1 (de) | Verfahren zur herstellung von lepidokrokit | |
| DE2045842A1 (de) | Magnetische Stoffe mit hoher Koerzi tivkraft, und Verfahren zu ihrer Herstellung | |
| DE2235383C3 (de) | Verfahren zur Herstellung ferromagnetischer nadelförmiger Teilchen für ein Aufzeichnungssystem | |
| DE2629931A1 (de) | Verfahren zur herstellung eines kobalt- und eisenhaltigen ferromagnetischen pulvers | |
| DE3217212A1 (de) | Magnetisches aufzeichnungsmedium | |
| DE2428875C2 (de) | Verfahren zur Herstellung von &gamma;-Eisen(III)oxid | |
| DE2905037C2 (de) | Magnetisches Material für Magnetaufzeichnungsmedien | |
| DE3235425C2 (de) | Magnetisches Aufzeichnungsmedium und Verfahren zu seiner Herstellung | |
| DE69123732T2 (de) | Verfahren zur Herstellung von nadelförmigen Goethit-Teilchen und nadelförmigen magnetischen Eisenoxid-Teilchen | |
| DE2550308C3 (de) | Verfahren zur Herstellung von nadeiförmigem a-Eisen(III)-Oxidhydrat | |
| DE69021132T2 (de) | Plattenförmige Magnetitteilchen und Verfahren zu ihrer Erzeugung. | |
| DE69800243T2 (de) | Verfahren zur Herstellung von Eisenoxid Hydrat und ferromagnetisches Eisenoxid | |
| DE69111196T2 (de) | Sphärische schwarze Eisenoxid-Teilchen vom Typ Spinel und Verfahren zu deren Herstellung. | |
| DE3520762C2 (enrdf_load_html_response) | ||
| DE2144553C2 (de) | Kristallines &gamma;-Eisen (III)oxid, Verfahren zu dessen Herstellung sowie Verwendung desselben |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OD | Request for examination | ||
| 8131 | Rejection |