DE3478286D1 - Ferromagnetic alloy particles for magnetic recording media and process for their manufacture - Google Patents
Ferromagnetic alloy particles for magnetic recording media and process for their manufactureInfo
- Publication number
- DE3478286D1 DE3478286D1 DE8484309054T DE3478286T DE3478286D1 DE 3478286 D1 DE3478286 D1 DE 3478286D1 DE 8484309054 T DE8484309054 T DE 8484309054T DE 3478286 T DE3478286 T DE 3478286T DE 3478286 D1 DE3478286 D1 DE 3478286D1
- Authority
- DE
- Germany
- Prior art keywords
- manufacture
- magnetic recording
- recording media
- alloy particles
- ferromagnetic alloy
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
- B22F9/22—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds using gaseous reductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F10/00—Thin magnetic films, e.g. of one-domain structure
- H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
- H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
- H01F10/12—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being metals or alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
-
- 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
- G11B5/70605—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 metals or alloys
- G11B5/70615—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 metals or alloys containing Fe metal or alloys
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Power Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Hard Magnetic Materials (AREA)
- Magnetic Record Carriers (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58246462A JPS60138002A (ja) | 1983-12-27 | 1983-12-27 | 紡錘型を呈した鉄を主成分とする金属磁性粒子粉末及びその製造法 |
JP59245300A JPH0619082B2 (ja) | 1984-11-19 | 1984-11-19 | 紡錘型を呈した鉄を主成分とする金属磁性粒子粉末及びその製造法 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3478286D1 true DE3478286D1 (en) | 1989-06-29 |
Family
ID=26537158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8484309054T Expired DE3478286D1 (en) | 1983-12-27 | 1984-12-21 | Ferromagnetic alloy particles for magnetic recording media and process for their manufacture |
Country Status (4)
Country | Link |
---|---|
US (1) | US4773931A (de) |
EP (1) | EP0148634B1 (de) |
KR (1) | KR850004869A (de) |
DE (1) | DE3478286D1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3876529T2 (de) * | 1987-07-31 | 1993-06-24 | Tdk Corp | Magnetisches weicheisenpulver zur formung magnetischer abschirmung, verbindung und verfahren zur herstellung. |
DE68923544T2 (de) * | 1988-12-29 | 1996-03-28 | Toda Kogyo Corp | Magnetische Eisenoxydteilchen und Verfahren zu ihrer Herstellung. |
US5238483A (en) * | 1989-01-27 | 1993-08-24 | Toda Kogyo Corporation | Acicular magnetic iron based alloy particles for magnetic recording and method of producing the same |
DE68918836T2 (de) * | 1989-01-27 | 1995-02-23 | Toda Kogyo Corp | Nadelförmige magnetische Teilchen aus einer Eisenlegierung für magnetische Aufzeichnung und Verfahren zu ihrer Herstellung. |
US5137783A (en) * | 1989-04-07 | 1992-08-11 | Toda Kogyo Corporation | Acicular magnetic metal particles containing iron as main ingredient and process for producing the same |
US5028483A (en) * | 1990-06-01 | 1991-07-02 | Minnesota Mining And Manufacturing Company | Magnetic recording medium comprising acicular dendrite free iron oxide magnetic pigment particles |
EP0466338B1 (de) * | 1990-06-26 | 1995-12-20 | Toda Kogyo Corp. | Magnetische spindelförmige Eisenlegierungsteilchen und Verfahren zu ihrer Herstellung |
JPH09504503A (ja) * | 1993-11-01 | 1997-05-06 | ミネソタ・マイニング・アンド・マニュファクチュアリング・カンパニー | ゲータイトの製造方法 |
DE102006042843A1 (de) * | 2006-09-08 | 2008-03-27 | Nanogate Ag | Elektretausrüstung |
JP7172091B2 (ja) * | 2018-03-28 | 2022-11-16 | Tdk株式会社 | 複合磁性体 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1099221A (fr) * | 1953-03-17 | 1955-08-31 | Electro Chimie Soc D | Procédé de production de poudres magnétisables et aimants permanents obtenus à partir de ces poudres |
JPS508099A (de) * | 1973-05-28 | 1975-01-28 | ||
JPS52155124A (en) * | 1976-06-18 | 1977-12-23 | Hitachi Metals Ltd | Permanent magnetic alloy |
JPS54122664A (en) * | 1978-03-16 | 1979-09-22 | Kanto Denka Kogyo Kk | Production of magnetic powder for magnetic recording based on iron |
JPS54122663A (en) * | 1978-03-16 | 1979-09-22 | Kanto Denka Kogyo Kk | Production of magnetic powder for magnetic recording based on iron |
US4289549A (en) * | 1978-10-31 | 1981-09-15 | Kabushiki Kaisha Suwa Seikosha | Resin bonded permanent magnet composition |
JPS5853688B2 (ja) * | 1980-08-05 | 1983-11-30 | 戸田工業株式会社 | Fe−Mgを主成分とする針状晶合金磁性粒子粉末の製造法 |
US4400337A (en) * | 1981-01-10 | 1983-08-23 | Hitachi Maxell, Ltd. | Method for production of metal magnetic particles |
JPS57183626A (en) * | 1981-05-07 | 1982-11-12 | Fuji Photo Film Co Ltd | Magnetic recording medium |
JPS5920402A (ja) * | 1982-07-26 | 1984-02-02 | Fuji Photo Film Co Ltd | 強磁性金属粉末 |
US4437881A (en) * | 1982-07-31 | 1984-03-20 | Toda Kogyo Corp. | Acicular ferromagnetic alloy particles and process for producing said particles |
-
1984
- 1984-10-27 KR KR1019840008412A patent/KR850004869A/ko not_active Application Discontinuation
- 1984-12-21 EP EP84309054A patent/EP0148634B1/de not_active Expired
- 1984-12-21 DE DE8484309054T patent/DE3478286D1/de not_active Expired
-
1987
- 1987-01-23 US US07/008,113 patent/US4773931A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0148634A2 (de) | 1985-07-17 |
US4773931A (en) | 1988-09-27 |
EP0148634B1 (de) | 1989-05-24 |
KR850004869A (ko) | 1985-07-27 |
EP0148634A3 (en) | 1986-06-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8339 | Ceased/non-payment of the annual fee |