DE2045842C3 - Verfahren zum Herstellen eines magnetischen Stoffes für Aufzeichnungsträger - Google Patents
Verfahren zum Herstellen eines magnetischen Stoffes für AufzeichnungsträgerInfo
- Publication number
- DE2045842C3 DE2045842C3 DE2045842A DE2045842A DE2045842C3 DE 2045842 C3 DE2045842 C3 DE 2045842C3 DE 2045842 A DE2045842 A DE 2045842A DE 2045842 A DE2045842 A DE 2045842A DE 2045842 C3 DE2045842 C3 DE 2045842C3
- Authority
- DE
- Germany
- Prior art keywords
- magnetic
- particles
- acicular
- autoclave
- water
- 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.)
- Expired
Links
- 239000000696 magnetic material Substances 0.000 title claims description 8
- 238000000034 method Methods 0.000 title description 19
- 230000005291 magnetic effect Effects 0.000 claims description 69
- 239000002245 particle Substances 0.000 claims description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 239000006249 magnetic particle Substances 0.000 claims description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 15
- 239000010419 fine particle Substances 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910001429 cobalt ion Inorganic materials 0.000 claims description 2
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 2
- 229910052753 mercury Inorganic materials 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 42
- 239000000243 solution Substances 0.000 description 34
- 239000000047 product Substances 0.000 description 31
- 239000000203 mixture Substances 0.000 description 29
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 23
- 239000011162 core material Substances 0.000 description 22
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 18
- 235000011114 ammonium hydroxide Nutrition 0.000 description 18
- 229910045601 alloy Inorganic materials 0.000 description 16
- 239000000956 alloy Substances 0.000 description 16
- 239000001257 hydrogen Substances 0.000 description 14
- 229910052739 hydrogen Inorganic materials 0.000 description 14
- 239000012153 distilled water Substances 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 12
- 239000013078 crystal Substances 0.000 description 12
- 238000004898 kneading Methods 0.000 description 12
- 239000010935 stainless steel Substances 0.000 description 12
- 229910001220 stainless steel Inorganic materials 0.000 description 12
- 239000004570 mortar (masonry) Substances 0.000 description 11
- 229910000859 α-Fe Inorganic materials 0.000 description 10
- 239000010941 cobalt Substances 0.000 description 9
- 229910017052 cobalt Inorganic materials 0.000 description 9
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 9
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 9
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 9
- 239000005995 Aluminium silicate Substances 0.000 description 8
- 235000012211 aluminium silicate Nutrition 0.000 description 8
- 238000012982 x-ray structure analysis Methods 0.000 description 8
- 241000080590 Niso Species 0.000 description 7
- 230000005294 ferromagnetic effect Effects 0.000 description 7
- 239000010453 quartz Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 229910052596 spinel Inorganic materials 0.000 description 7
- 239000011029 spinel Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 229910020630 Co Ni Inorganic materials 0.000 description 6
- 229910002440 Co–Ni Inorganic materials 0.000 description 6
- 229910017061 Fe Co Inorganic materials 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000012298 atmosphere Substances 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 6
- 230000004907 flux Effects 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 229910002588 FeOOH Inorganic materials 0.000 description 5
- 238000000151 deposition Methods 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 239000007795 chemical reaction product Substances 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 235000013980 iron oxide Nutrition 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 4
- 230000033458 reproduction Effects 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 description 3
- 150000004056 anthraquinones Chemical class 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000007771 core particle Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 3
- 239000006247 magnetic powder Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 2
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- SMEGJBVQLJJKKX-HOTMZDKISA-N [(2R,3S,4S,5R,6R)-5-acetyloxy-3,4,6-trihydroxyoxan-2-yl]methyl acetate Chemical compound CC(=O)OC[C@@H]1[C@H]([C@@H]([C@H]([C@@H](O1)O)OC(=O)C)O)O SMEGJBVQLJJKKX-HOTMZDKISA-N 0.000 description 2
- 229940081735 acetylcellulose Drugs 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 2
- 229920002301 cellulose acetate Polymers 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- MULYSYXKGICWJF-UHFFFAOYSA-L cobalt(2+);oxalate Chemical compound [Co+2].[O-]C(=O)C([O-])=O MULYSYXKGICWJF-UHFFFAOYSA-L 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 229910052598 goethite Inorganic materials 0.000 description 2
- 239000011019 hematite Substances 0.000 description 2
- 229910052595 hematite Inorganic materials 0.000 description 2
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 2
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 101150039167 Bex3 gene Proteins 0.000 description 1
- 229910001152 Bi alloy Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 description 1
- -1 acicular gaysite Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 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
- 238000001816 cooling Methods 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- VEPSWGHMGZQCIN-UHFFFAOYSA-H ferric oxalate Chemical compound [Fe+3].[Fe+3].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O VEPSWGHMGZQCIN-UHFFFAOYSA-H 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000011361 granulated particle Substances 0.000 description 1
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 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
- 239000007788 liquid Substances 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 235000006408 oxalic acid Nutrition 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
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
- 239000004094 surface-active agent Substances 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
- H01F1/061—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 with a protective layer
-
- 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
- G11B5/70647—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 with a skin
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Health & Medical Sciences (AREA)
- Dermatology (AREA)
- General Health & Medical Sciences (AREA)
- Hard Magnetic Materials (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Paints Or Removers (AREA)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7338869 | 1969-09-16 | ||
| JP44076468A JPS5020557B1 (Direct) | 1969-09-25 | 1969-09-25 | |
| JP8622269 | 1969-10-29 | ||
| JP8791669 | 1969-10-31 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2045842A1 DE2045842A1 (de) | 1971-05-27 |
| DE2045842B2 DE2045842B2 (de) | 1975-03-13 |
| DE2045842C3 true DE2045842C3 (de) | 1975-10-23 |
Family
ID=27465579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2045842A Expired DE2045842C3 (de) | 1969-09-16 | 1970-09-16 | Verfahren zum Herstellen eines magnetischen Stoffes für Aufzeichnungsträger |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3770500A (Direct) |
| DE (1) | DE2045842C3 (Direct) |
| FR (1) | FR2061051A5 (Direct) |
| NL (1) | NL155116B (Direct) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3920410A (en) * | 1971-04-28 | 1975-11-18 | Sherritt Gordon Mines Ltd | Cobalt coated composite powder |
| JPS5029157B1 (Direct) * | 1971-05-27 | 1975-09-20 | ||
| JPS5613005B2 (Direct) * | 1971-08-19 | 1981-03-25 | ||
| US4064292A (en) * | 1972-09-01 | 1977-12-20 | Badische Anilin- & Soda-Fabrik, Aktiengesellschaft | Manufacture of cobalt-modified γ-iron(III)oxides |
| US4010310A (en) * | 1973-03-20 | 1977-03-01 | Tdk Electronics Company, Limited | Magnetic powder |
| JPS5719049B2 (Direct) * | 1974-06-13 | 1982-04-20 | ||
| JPS604566B2 (ja) * | 1974-06-28 | 1985-02-05 | 富士写真フイルム株式会社 | 強磁性粉末及びこれを使用した磁気記録体の安定化方法 |
| JPS6018129B2 (ja) * | 1975-07-03 | 1985-05-09 | 凸版印刷株式会社 | 磁気記録用金属微粒子の製造方法 |
| US4272510A (en) * | 1976-04-26 | 1981-06-09 | Smith Kendall O | Magnetic attraction transfer process for use in solid phase radioimmunoassays and in other assay methods |
| US4150173A (en) * | 1976-08-02 | 1979-04-17 | Xerox Corporation | Process of preparing transparent colored magnetic materials |
| US4137342A (en) | 1976-10-29 | 1979-01-30 | Minnesota Mining And Manufacturing Company | Cobalt-doped acicular hyper-magnetite particles |
| US4501774A (en) * | 1981-10-12 | 1985-02-26 | Ishihara Sangyo Kaisha, Ltd. | Process for the production of cobalt-containing magnetic iron oxide powder |
| US4657816A (en) * | 1982-04-19 | 1987-04-14 | Memorex Corporation | Ferromagnetic recording materials |
| JPS6028025A (ja) * | 1983-07-26 | 1985-02-13 | Fuji Photo Film Co Ltd | 磁気記録媒体 |
| US4563184A (en) * | 1983-10-17 | 1986-01-07 | Bernard Korol | Synthetic resin wound dressing and method of treatment using same |
| JPS6120302A (ja) * | 1984-07-06 | 1986-01-29 | Hitachi Maxell Ltd | 強磁性粉末とその製造方法 |
| DE3633130A1 (de) * | 1986-09-30 | 1988-03-31 | Basf Ag | Feinteilige, sphaerische, zweischichtige feststoffteilchen |
| US5075169A (en) * | 1988-06-08 | 1991-12-24 | Toda Kogyo Corp. | Plate-like composite ferrite particles for magnetic recording and process for producing the same |
| US9138727B2 (en) * | 2012-12-12 | 2015-09-22 | The United States of America, as represented by the Secretary of Commerce, The National Institute of Standards and Technology | Iron—nickel core-shell nanoparticles |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3046158A (en) * | 1958-12-31 | 1962-07-24 | Fuji Photo Film Co Ltd | Process for producing magnetic material |
| US3062680A (en) * | 1960-06-20 | 1962-11-06 | Sherritt Gordon Mines Ltd | Hydrogenation catalysts for reducing reactions |
| US3042543A (en) * | 1960-11-07 | 1962-07-03 | Franklin Inst Of The State Of | Magnetic particles and method of making same |
| US3147154A (en) * | 1961-05-25 | 1964-09-01 | Texaco Inc | Method of depositing metal-containing material onto an extended surface |
| US3348969A (en) * | 1963-11-06 | 1967-10-24 | Gen Motors Corp | Electroless nickel plating |
-
1970
- 1970-08-26 US US00067273A patent/US3770500A/en not_active Expired - Lifetime
- 1970-09-07 FR FR7032435A patent/FR2061051A5/fr not_active Expired
- 1970-09-16 NL NL707013667A patent/NL155116B/xx unknown
- 1970-09-16 DE DE2045842A patent/DE2045842C3/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US3770500A (en) | 1973-11-06 |
| DE2045842B2 (de) | 1975-03-13 |
| NL7013667A (Direct) | 1971-03-18 |
| NL155116B (nl) | 1977-11-15 |
| FR2061051A5 (Direct) | 1971-06-18 |
| DE2045842A1 (de) | 1971-05-27 |
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