DE2202853A1 - Verfahren zur herstellung von feinteiligen, nadelfoermigen, magnetischen eisenoxiden - Google Patents
Verfahren zur herstellung von feinteiligen, nadelfoermigen, magnetischen eisenoxidenInfo
- Publication number
- DE2202853A1 DE2202853A1 DE19722202853 DE2202853A DE2202853A1 DE 2202853 A1 DE2202853 A1 DE 2202853A1 DE 19722202853 DE19722202853 DE 19722202853 DE 2202853 A DE2202853 A DE 2202853A DE 2202853 A1 DE2202853 A1 DE 2202853A1
- Authority
- DE
- Germany
- Prior art keywords
- iron
- magnetic
- hydroxide
- feooh
- oxide
- 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
- 230000005291 magnetic effect Effects 0.000 title claims description 43
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title claims description 35
- 235000013980 iron oxide Nutrition 0.000 title claims description 23
- 238000000034 method Methods 0.000 title claims description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 230000008569 process Effects 0.000 title claims description 9
- 239000010419 fine particle Substances 0.000 title 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 25
- 229910002588 FeOOH Inorganic materials 0.000 claims description 19
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 claims description 16
- 239000000725 suspension Substances 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 230000009467 reduction Effects 0.000 claims description 14
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 claims description 11
- 230000003647 oxidation Effects 0.000 claims description 11
- 238000007254 oxidation reaction Methods 0.000 claims description 11
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 claims description 8
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 claims description 8
- 238000005496 tempering Methods 0.000 claims description 7
- 229910000462 iron(III) oxide hydroxide Inorganic materials 0.000 claims description 6
- 229910021519 iron(III) oxide-hydroxide Inorganic materials 0.000 claims description 6
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- 230000005294 ferromagnetic effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000007858 starting material Substances 0.000 claims description 3
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 2
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 238000010405 reoxidation reaction Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 13
- 235000019353 potassium silicate Nutrition 0.000 description 12
- 239000000047 product Substances 0.000 description 10
- 238000005245 sintering Methods 0.000 description 9
- 229910004298 SiO 2 Inorganic materials 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 239000000969 carrier Substances 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical class O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 2
- 238000000635 electron micrograph Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- QGPQTSCLUYMZHL-UHFFFAOYSA-N iron(3+);oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Fe+3].[Fe+3] QGPQTSCLUYMZHL-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- KNIUHBNRWZGIQQ-UHFFFAOYSA-N 7-diethoxyphosphinothioyloxy-4-methylchromen-2-one Chemical compound CC1=CC(=O)OC2=CC(OP(=S)(OCC)OCC)=CC=C21 KNIUHBNRWZGIQQ-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000004111 Potassium silicate Substances 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- UFMVZRLWGLUPJH-UHFFFAOYSA-L iron(2+) oxygen(2-) dihydroxide Chemical compound [OH-].[O-2].[Fe+2].[OH-].[Fe+2] UFMVZRLWGLUPJH-UHFFFAOYSA-L 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000019351 sodium silicates Nutrition 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
- 150000003754 zirconium Chemical class 0.000 description 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
- G11B5/70652—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
- G11B5/70663—Preparation processes specially adapted therefor, e.g. using stabilising agents
-
- 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
-
- 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
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/42—Magnetic properties
-
- 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
- C01P2006/80—Compositional purity
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Compounds Of Iron (AREA)
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE794292D BE794292A (fr) | 1972-01-21 | Procede de preparation d'oxydes de fer magnetiques aciculaires finement divises | |
| DE19722202853 DE2202853A1 (de) | 1972-01-21 | 1972-01-21 | Verfahren zur herstellung von feinteiligen, nadelfoermigen, magnetischen eisenoxiden |
| US05/322,819 US3947502A (en) | 1972-01-21 | 1973-01-11 | Production of finely divided acicular magnetic iron oxides |
| NL7300705A NL7300705A (US20060205796A1-20060914-C00130.png) | 1972-01-21 | 1973-01-17 | |
| GB283273A GB1402801A (en) | 1972-01-21 | 1973-01-19 | Production of finely divided acicular magnetic iron oxides |
| FR7301966A FR2168562B1 (US20060205796A1-20060914-C00130.png) | 1972-01-21 | 1973-01-19 | |
| CA161,611A CA1019561A (en) | 1972-01-21 | 1973-01-19 | Production of finely divided acicular magnetic iron oxides |
| PL1973160336A PL87763B1 (US20060205796A1-20060914-C00130.png) | 1972-01-21 | 1973-01-19 | |
| IT47788/73A IT976964B (it) | 1972-01-21 | 1973-01-19 | Procedimento per produrre ossidi di ferro magnetici aciculari ed elemento di memoria che li contiene |
| JP48008297A JPS4883100A (US20060205796A1-20060914-C00130.png) | 1972-01-21 | 1973-01-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19722202853 DE2202853A1 (de) | 1972-01-21 | 1972-01-21 | Verfahren zur herstellung von feinteiligen, nadelfoermigen, magnetischen eisenoxiden |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2202853A1 true DE2202853A1 (de) | 1973-07-26 |
Family
ID=5833644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19722202853 Pending DE2202853A1 (de) | 1972-01-21 | 1972-01-21 | Verfahren zur herstellung von feinteiligen, nadelfoermigen, magnetischen eisenoxiden |
Country Status (10)
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2801395A1 (de) * | 1978-01-13 | 1979-07-19 | Bayer Ag | Ferrimagnetisches eisenoxid und verfahren zu dessen herstellung |
| DE3029835A1 (de) * | 1979-08-11 | 1981-03-26 | Tdk Corp., Tokio/Tokyo | Magnetpulver fuer ein magnetisches aufzeichnungsmedium |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4096292A (en) * | 1975-01-14 | 1978-06-20 | Montedison S.P.A. | Process for preparing ferrimagnetic acicular ferric oxide |
| DE2520643C2 (de) * | 1975-05-09 | 1983-11-17 | Basf Ag, 6700 Ludwigshafen | Verfahren zur Herstellung von γ-Eisen(III)oxid |
| DE2550308C3 (de) * | 1975-11-08 | 1978-07-13 | Basf Ag, 6700 Ludwigshafen | Verfahren zur Herstellung von nadeiförmigem a-Eisen(III)-Oxidhydrat |
| DE2550225C3 (de) * | 1975-11-08 | 1978-06-22 | Basf Ag, 6700 Ludwigshafen | Verfahren zur Herstellung von nadeiförmigem Y-Eisen(IID-oxid |
| DE2550307C3 (de) * | 1975-11-08 | 1978-07-06 | Basf Ag, 6700 Ludwigshafen | Verfahren zur Herstellung von nadeiförmigem Y-Eisen(ni)-Oxid |
| JPS5295097A (en) * | 1976-02-04 | 1977-08-10 | Nippon Telegr & Teleph Corp <Ntt> | Magnetic recording material |
| US4133677A (en) * | 1976-04-05 | 1979-01-09 | Toda Kogyo Corp. | Process for producing acicular magnetic metallic particle powder |
| JPS5356196A (en) * | 1976-11-01 | 1978-05-22 | Toda Kogyo Corp | Process for preparing acicular alphaafeooh particle |
| US4136158A (en) * | 1976-11-01 | 1979-01-23 | Toda Kogyo Corp. | Production of acicular magnetic iron oxides |
| JPS5420998A (en) * | 1977-07-18 | 1979-02-16 | Toda Kogyo Corp | Method of making coocontaining acicular crystal magnetic ferrite particulates |
| US4221607A (en) * | 1979-03-23 | 1980-09-09 | Cities Service Company | Calcining effect of synthetic iron oxide |
| US4299635A (en) * | 1979-03-23 | 1981-11-10 | Theodore Dickerson | Flow characteristics of synthetic iron oxide |
| US4291010A (en) * | 1979-09-05 | 1981-09-22 | Titan Kogyo Kabushiki Kaisha | Heat stable yellow iron oxides |
| JPS5676510A (en) * | 1979-11-28 | 1981-06-24 | Tdk Corp | Manufacture of magnetic recording material |
| JPS5677931A (en) * | 1979-11-28 | 1981-06-26 | Tdk Corp | Magnetic recording medium and its producton |
| DE3022875A1 (de) * | 1980-06-19 | 1982-01-14 | Bayer Ag, 5090 Leverkusen | Verfahren zur herstellung von eisenoxidpigmenten mit verbesserter reinheit sowie deren verwendung |
| JPS5763605A (en) * | 1980-10-01 | 1982-04-17 | Kanto Denka Kogyo Kk | Manufacture of metallic magnetic powder |
| US4451495A (en) * | 1982-08-30 | 1984-05-29 | International Business Machines Corporation | Increasing magnetic particle concentration in magnetic coatings |
| DE3484652D1 (de) * | 1983-03-21 | 1991-07-04 | Union Oil Co | Verfahren zum abtrennen schwerer metalle aus waessrigen loesungen durch kopraezipitation. |
| US5045214A (en) * | 1983-03-21 | 1991-09-03 | Union Oil Company Of California | Methods for removing substances from aqueous solutions |
| DE3573039D1 (en) * | 1984-04-28 | 1989-10-19 | Toda Kogyo Corp | Magnetic iron oxide particles |
| US5286687A (en) * | 1991-08-09 | 1994-02-15 | Agency Of Industrial Science And Technology | Method for production of needlelike crystalline particles |
| US5814164A (en) * | 1994-11-09 | 1998-09-29 | American Scientific Materials Technologies L.P. | Thin-walled, monolithic iron oxide structures made from steels, and methods for manufacturing such structures |
| US6461562B1 (en) | 1999-02-17 | 2002-10-08 | American Scientific Materials Technologies, Lp | Methods of making sintered metal oxide articles |
| DE102008003615A1 (de) * | 2008-01-09 | 2009-07-16 | Magforce Nanotechnologies Ag | Magnetische Transducer |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1176544B (de) * | 1957-09-18 | 1964-08-20 | Hermsdorf Keramik Veb | Verfahren zur Herstellung von hartmagnetischen Oxydwerkstoffen |
| US3115470A (en) * | 1961-03-29 | 1963-12-24 | Georgia Kaolin Co | Magnetic material, magnetic impulse recording members, and methods of making magnetic material |
| DE1252646B (de) * | 1965-07-26 | 1967-10-26 | VEB Filmfabrik Wolfen Wolfen (Kr Bitterfeld) | Verfahren zur Stabili sierung von a-FeO(OH) fur die Herstellung von } Fe2O3 |
-
0
- BE BE794292D patent/BE794292A/xx unknown
-
1972
- 1972-01-21 DE DE19722202853 patent/DE2202853A1/de active Pending
-
1973
- 1973-01-11 US US05/322,819 patent/US3947502A/en not_active Expired - Lifetime
- 1973-01-17 NL NL7300705A patent/NL7300705A/xx not_active Application Discontinuation
- 1973-01-19 GB GB283273A patent/GB1402801A/en not_active Expired
- 1973-01-19 IT IT47788/73A patent/IT976964B/it active
- 1973-01-19 PL PL1973160336A patent/PL87763B1/pl unknown
- 1973-01-19 CA CA161,611A patent/CA1019561A/en not_active Expired
- 1973-01-19 FR FR7301966A patent/FR2168562B1/fr not_active Expired
- 1973-01-20 JP JP48008297A patent/JPS4883100A/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2801395A1 (de) * | 1978-01-13 | 1979-07-19 | Bayer Ag | Ferrimagnetisches eisenoxid und verfahren zu dessen herstellung |
| DE3029835A1 (de) * | 1979-08-11 | 1981-03-26 | Tdk Corp., Tokio/Tokyo | Magnetpulver fuer ein magnetisches aufzeichnungsmedium |
Also Published As
| Publication number | Publication date |
|---|---|
| IT976964B (it) | 1974-09-10 |
| PL87763B1 (US20060205796A1-20060914-C00130.png) | 1976-07-31 |
| JPS4883100A (US20060205796A1-20060914-C00130.png) | 1973-11-06 |
| US3947502A (en) | 1976-03-30 |
| CA1019561A (en) | 1977-10-25 |
| BE794292A (fr) | 1973-07-19 |
| FR2168562B1 (US20060205796A1-20060914-C00130.png) | 1978-12-29 |
| FR2168562A1 (US20060205796A1-20060914-C00130.png) | 1973-08-31 |
| NL7300705A (US20060205796A1-20060914-C00130.png) | 1973-07-24 |
| GB1402801A (en) | 1975-08-13 |
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