EP0024692A3 - Process for preparing acicular ferromagnetic iron particles, and their use - Google Patents
Process for preparing acicular ferromagnetic iron particles, and their use Download PDFInfo
- Publication number
- EP0024692A3 EP0024692A3 EP80104974A EP80104974A EP0024692A3 EP 0024692 A3 EP0024692 A3 EP 0024692A3 EP 80104974 A EP80104974 A EP 80104974A EP 80104974 A EP80104974 A EP 80104974A EP 0024692 A3 EP0024692 A3 EP 0024692A3
- Authority
- EP
- European Patent Office
- Prior art keywords
- iron particles
- ferromagnetic iron
- acicular ferromagnetic
- preparing acicular
- preparing
- 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.)
- Granted
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
- 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
-
- 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)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Hard Magnetic Materials (AREA)
- Compounds Of Iron (AREA)
- Paints Or Removers (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Magnetic Record Carriers (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2935357 | 1979-09-01 | ||
DE19792935357 DE2935357A1 (en) | 1979-09-01 | 1979-09-01 | METHOD FOR PRODUCING NEEDLE-SHAPED FERROMAGNETIC IRON PARTICLES AND THE USE THEREOF |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0024692A2 EP0024692A2 (en) | 1981-03-11 |
EP0024692A3 true EP0024692A3 (en) | 1981-08-26 |
EP0024692B1 EP0024692B1 (en) | 1984-03-28 |
Family
ID=6079796
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80104974A Expired EP0024692B1 (en) | 1979-09-01 | 1980-08-21 | Process for preparing acicular ferromagnetic iron particles, and their use |
Country Status (4)
Country | Link |
---|---|
US (1) | US4295879A (en) |
EP (1) | EP0024692B1 (en) |
JP (1) | JPS5641835A (en) |
DE (2) | DE2935357A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56145525A (en) * | 1980-04-11 | 1981-11-12 | Tdk Corp | Magnetic recording medium |
DE3231192A1 (en) * | 1982-08-21 | 1984-02-23 | Basf Ag, 6700 Ludwigshafen | MOLDED IRON CATALYST, THEIR PRODUCTION AND USE |
JPS59157204A (en) * | 1983-02-23 | 1984-09-06 | Chisso Corp | Manufacture of ferromagnetic metallic fine particle |
JP2582764B2 (en) * | 1986-02-05 | 1997-02-19 | バスフ アクチェン ゲゼルシャフト | Method for producing acicular ferromagnetic metal powder consisting essentially of iron |
JP2931182B2 (en) * | 1992-07-17 | 1999-08-09 | 石原産業株式会社 | Method for producing acicular γ-FeOOH |
SE9401392D0 (en) * | 1994-04-25 | 1994-04-25 | Hoeganaes Ab | Heat-treating or iron powders |
US5796018A (en) * | 1997-01-29 | 1998-08-18 | Procedyne Corp. | Process for coating iron particles with phosphorus and forming compacted articles |
ITMI20020567A1 (en) * | 2002-03-18 | 2003-09-18 | Sud Chemie S R L | PROCESS FOR THE PREPARATION OF IRON OXIDES |
US8911663B2 (en) * | 2009-03-05 | 2014-12-16 | Quebec Metal Powders, Ltd. | Insulated iron-base powder for soft magnetic applications |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH528320A (en) * | 1969-04-17 | 1972-09-30 | Stamicarbon | Discs, tapes and magnetic bodies for magnetic recordings |
FR2368131A1 (en) * | 1976-10-14 | 1978-05-12 | Basf Ag | PARTICLES |
FR2385476A1 (en) * | 1977-04-01 | 1978-10-27 | Basf Ag | PROCESS FOR PREPARING ACICULAR FERROMAGNETIC IRON PARTICLES |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3082067A (en) * | 1959-04-28 | 1963-03-19 | Bayer Ag | Process for the production of isometric ferromagnetic gamma-ferric oxide |
NL162233C (en) * | 1968-03-05 | 1980-04-15 | Philips Nv | METHOD FOR PREPARING AN IRON MAGNETIC STABLE POWDER, FOR MAGNETIC REGISTRATION. |
NL163355C (en) * | 1969-04-08 | 1980-08-15 | Philips Nv | METHOD FOR PREPARING AN IRON MAGNETIC STABLE METAL POWDER, FOR MAGNETIC REGISTRATION. |
JPS4922630B1 (en) * | 1970-06-23 | 1974-06-10 | ||
DE2434058C2 (en) * | 1974-07-16 | 1985-12-19 | Basf Ag, 6700 Ludwigshafen | Acicular ferromagnetic metal particles consisting primarily of iron and processes for their manufacture |
DE2434096C2 (en) * | 1974-07-16 | 1985-10-17 | Basf Ag, 6700 Ludwigshafen | Acicular ferromagnetic metal particles consisting primarily of iron and processes for their manufacture |
-
1979
- 1979-09-01 DE DE19792935357 patent/DE2935357A1/en not_active Withdrawn
-
1980
- 1980-07-31 US US06/174,240 patent/US4295879A/en not_active Expired - Lifetime
- 1980-08-21 EP EP80104974A patent/EP0024692B1/en not_active Expired
- 1980-08-21 DE DE8080104974T patent/DE3067268D1/en not_active Expired
- 1980-08-29 JP JP11854180A patent/JPS5641835A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH528320A (en) * | 1969-04-17 | 1972-09-30 | Stamicarbon | Discs, tapes and magnetic bodies for magnetic recordings |
FR2368131A1 (en) * | 1976-10-14 | 1978-05-12 | Basf Ag | PARTICLES |
FR2385476A1 (en) * | 1977-04-01 | 1978-10-27 | Basf Ag | PROCESS FOR PREPARING ACICULAR FERROMAGNETIC IRON PARTICLES |
Also Published As
Publication number | Publication date |
---|---|
DE2935357A1 (en) | 1981-09-10 |
US4295879A (en) | 1981-10-20 |
JPS5641835A (en) | 1981-04-18 |
EP0024692A2 (en) | 1981-03-11 |
DE3067268D1 (en) | 1984-05-03 |
EP0024692B1 (en) | 1984-03-28 |
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