GB1291064A - Permanently magnetizable material - Google Patents
Permanently magnetizable materialInfo
- Publication number
- GB1291064A GB1291064A GB56715/69A GB5671569A GB1291064A GB 1291064 A GB1291064 A GB 1291064A GB 56715/69 A GB56715/69 A GB 56715/69A GB 5671569 A GB5671569 A GB 5671569A GB 1291064 A GB1291064 A GB 1291064A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- particles
- oxides
- mixed
- coated
- 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
- 239000002245 particle Substances 0.000 abstract 5
- 239000000243 solution Substances 0.000 abstract 5
- 229910020598 Co Fe Inorganic materials 0.000 abstract 3
- 229910002519 Co-Fe Inorganic materials 0.000 abstract 3
- 229910004298 SiO 2 Inorganic materials 0.000 abstract 2
- 238000002347 injection Methods 0.000 abstract 2
- 239000007924 injection Substances 0.000 abstract 2
- 229910021645 metal ion Inorganic materials 0.000 abstract 2
- 239000007800 oxidant agent Substances 0.000 abstract 2
- 230000003647 oxidation Effects 0.000 abstract 2
- 238000007254 oxidation reaction Methods 0.000 abstract 2
- 230000001590 oxidative effect Effects 0.000 abstract 2
- 239000000725 suspension Substances 0.000 abstract 2
- 229910003271 Ni-Fe Inorganic materials 0.000 abstract 1
- 239000002253 acid Substances 0.000 abstract 1
- 239000012670 alkaline solution Substances 0.000 abstract 1
- 238000000975 co-precipitation Methods 0.000 abstract 1
- 229910052736 halogen Inorganic materials 0.000 abstract 1
- 150000002367 halogens Chemical class 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 229920006267 polyester film Polymers 0.000 abstract 1
- 229920002635 polyurethane Polymers 0.000 abstract 1
- 239000004814 polyurethane Substances 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 abstract 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
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/8416—Processes or apparatus specially adapted for manufacturing record carriers coating a support with a magnetic layer by precipitation
-
- 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
- G11B5/7061—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 with a non-magnetic core
-
- 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
- H01F1/063—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 non magnetic core
-
- 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
- H01F1/10—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
- H01F1/111—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles with a non-magnetic core
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Metallurgy (AREA)
- Hard Magnetic Materials (AREA)
- Compounds Of Iron (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Soft Magnetic Materials (AREA)
- Oxygen, Ozone, And Oxides In General (AREA)
- Silicon Compounds (AREA)
Abstract
1291064 Oxide-coated particles STAMICARBON NY 19 Nov 1969 [21 Nov 1968] 56715/69 Heading C1A [Also in Division H1] Permanently magnetizable MO.Fe 2 O 3 (M is Fe<SP>++</SP> or another bivalent metal ion) is precipitated on to carrier particles suspended in a solution containing Fe<SP>++</SP> with or without another bivalent metal ion by converting Fe<SP>++</SP> to Fe<SP>++</SP><SP>+</SP> at pH 2-6À5 at such a gradual rate in the agitated solution that precipitation is not effected in the body of the solution. The particles are then separated from the liquid, washed and dried by heating. The particles may then be calcined, optionally followed by complete or partial reduction. Oxidation may be effected by NO 3 derived from a solution of NH 4 NO 3 or by halogen oxy-acids. The required pH may be maintained by injection of an alkaline solution, e.g. Na 2 CO 3 , NaHCO 3 or NH 4 OH, Alternatively, oxidation may be carried out by injecting a rapid oxidant, e.g. KM 2 O 4 or NaNO 2 into the carrier suspension. In this embodiment, the rate of injection is such that the increase in the amount of Fe<SP>++</SP><SP>+</SP> in the suspension is not more than 0À05 mole per litre and per minute, and the deviations around the mean change do not exceed 0À001 mole per litre of solution. Examples describe the co-precipitation, on to SiO 2 particles, of mixed Ni-Fe oxides, mixed Co-Fe oxides and a Co-Fe oxide containing Mn (derived from KMnO 4 oxidant). The oxides are described as ferrites. In one example, the product (SiO 2 coated with Co-Fe oxides) is mixed with polyurethane in DMF and coated on to a polyester film.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL6800237A NL6800237A (en) | 1968-01-06 | 1968-01-06 | |
NL6804971A NL6804971A (en) | 1968-04-09 | 1968-04-09 | |
NL6804970A NL6804970A (en) | 1968-04-09 | 1968-04-09 | |
NL6816682A NL6816682A (en) | 1968-11-21 | 1968-11-21 | Permanently magnetisable substance |
NL6818247A NL6818247A (en) | 1968-12-19 | 1968-12-19 | Ferromagnetic material prepn. |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1291064A true GB1291064A (en) | 1972-09-27 |
Family
ID=27532474
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08245/69A Expired GB1261399A (en) | 1968-01-06 | 1969-04-09 | Process for preparing supported permanently-magnetizable metals or alloys |
GB56715/69A Expired GB1291064A (en) | 1968-01-06 | 1969-11-19 | Permanently magnetizable material |
GB1295440D Expired GB1295440A (en) | 1968-01-06 | 1969-12-17 |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08245/69A Expired GB1261399A (en) | 1968-01-06 | 1969-04-09 | Process for preparing supported permanently-magnetizable metals or alloys |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1295440D Expired GB1295440A (en) | 1968-01-06 | 1969-12-17 |
Country Status (10)
Country | Link |
---|---|
JP (2) | JPS4912959B1 (en) |
AT (2) | AT295175B (en) |
BE (3) | BE731186A (en) |
CH (2) | CH546712A (en) |
DE (3) | DE1917644A1 (en) |
DK (1) | DK134932B (en) |
ES (2) | ES373717A1 (en) |
FR (3) | FR2005878A1 (en) |
GB (3) | GB1261399A (en) |
SE (2) | SE352767B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT967674B (en) * | 1971-09-21 | 1974-03-11 | Union Carbide Corp | THERMOSET ARYLIMIDES |
NL7708959A (en) * | 1977-08-15 | 1979-02-19 | Philips Nv | PROCEDURE FOR FORMING A MAGNETO-OPTIC POLYCRYSTALLINE COBALT FERRITE LAYER AND COBALT FERRITE LAYER MANUFACTURED BY THE PROCESS. |
JPS59111929A (en) * | 1982-12-15 | 1984-06-28 | Masanori Abe | Preparation of ferrite film |
JPS6310163A (en) * | 1986-06-30 | 1988-01-16 | Nippon Paint Co Ltd | Toner coated with magnetic material |
-
1969
- 1969-04-05 DE DE19691917644 patent/DE1917644A1/en active Pending
- 1969-04-08 BE BE731186D patent/BE731186A/xx unknown
- 1969-04-09 GB GB08245/69A patent/GB1261399A/en not_active Expired
- 1969-04-09 SE SE05023/69A patent/SE352767B/xx unknown
- 1969-04-09 FR FR6910908A patent/FR2005878A1/fr not_active Withdrawn
- 1969-11-18 CH CH1712369A patent/CH546712A/en not_active IP Right Cessation
- 1969-11-19 GB GB56715/69A patent/GB1291064A/en not_active Expired
- 1969-11-19 AT AT1081369A patent/AT295175B/en active
- 1969-11-20 ES ES373717A patent/ES373717A1/en not_active Expired
- 1969-11-21 SE SE16062/69A patent/SE352978B/xx unknown
- 1969-11-21 DK DK619869AA patent/DK134932B/en unknown
- 1969-11-21 DE DE1958606A patent/DE1958606C3/en not_active Expired
- 1969-11-21 FR FR6940166A patent/FR2030660A5/fr not_active Expired
- 1969-11-21 BE BE742017D patent/BE742017A/xx unknown
- 1969-11-21 JP JP44093548A patent/JPS4912959B1/ja active Pending
- 1969-12-17 GB GB1295440D patent/GB1295440A/en not_active Expired
- 1969-12-18 CH CH1886869A patent/CH558980A/en unknown
- 1969-12-19 ES ES374722A patent/ES374722A2/en not_active Expired
- 1969-12-19 BE BE743394D patent/BE743394A/xx unknown
- 1969-12-19 JP JP44102388A patent/JPS526958B1/ja active Pending
- 1969-12-19 AT AT1186469A patent/AT297660B/en not_active IP Right Cessation
- 1969-12-19 DE DE19691963828 patent/DE1963828A1/en active Pending
- 1969-12-19 FR FR6944049A patent/FR2026578A6/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE743394A (en) | 1970-06-19 |
JPS526958B1 (en) | 1977-02-25 |
CH558980A (en) | 1975-02-14 |
FR2026578A6 (en) | 1970-09-18 |
DK134932C (en) | 1977-07-04 |
SE352978B (en) | 1973-01-15 |
DE1958606C3 (en) | 1979-04-19 |
DK134932B (en) | 1977-02-14 |
FR2005878A1 (en) | 1969-12-19 |
ES373717A1 (en) | 1972-04-16 |
AT297660B (en) | 1972-04-10 |
SE352767B (en) | 1973-01-08 |
JPS4912959B1 (en) | 1974-03-28 |
ES374722A2 (en) | 1972-04-01 |
DE1958606B2 (en) | 1978-07-20 |
CH546712A (en) | 1974-03-15 |
GB1261399A (en) | 1972-01-26 |
AT295175B (en) | 1971-12-27 |
BE731186A (en) | 1969-10-08 |
BE742017A (en) | 1970-05-21 |
DE1958606A1 (en) | 1970-06-18 |
DE1963828A1 (en) | 1970-10-08 |
GB1295440A (en) | 1972-11-08 |
DE1917644A1 (en) | 1970-09-10 |
FR2030660A5 (en) | 1970-11-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1392980A (en) | Production of acicular magnetic iron oxides | |
GB1264994A (en) | ||
GB1142215A (en) | Improvements in or relating to ferrite particles and process for manufacturing same | |
GB1224273A (en) | Preparation of active electrode material | |
GB1402801A (en) | Production of finely divided acicular magnetic iron oxides | |
GB1312227A (en) | Method of making a magnetic powder | |
GB1347615A (en) | Cobalt doped magnetic iron oxide particles | |
GB1221733A (en) | Method of preparing magnetically stable powders | |
GB1303523A (en) | ||
GB1269859A (en) | Magnetisable particulate material | |
GB1356846A (en) | Preparation of iron oxide pigments | |
GB1441183A (en) | Magnetic recording particles | |
GB1291064A (en) | Permanently magnetizable material | |
GB1195333A (en) | Permanent Magnet Built up from Fine Particles of a Compound M5R | |
US3117933A (en) | Process for the production of needleshaped, cobalt-containing gamma-ferric oxide crystalline particles | |
GB1487008A (en) | Preparation of magnetite from ferrous sulphate | |
GB1535889A (en) | Continuous production of iron oxide black pigments | |
GB644639A (en) | Improvements in or relating to magnetic materials | |
GB1226876A (en) | ||
JPS54106895A (en) | Ferromagnetic powder | |
GB1125093A (en) | Production of magnetizable metallic particles suitable for the production of magnetic recording media | |
GB1164318A (en) | Catalysts and the preparation thereof | |
ES315543A1 (en) | Procedure for the production of sponge iron. (Machine-translation by Google Translate, not legally binding) | |
GB2001942A (en) | Methods of making magnetic powders and magnetic recording media including magnetic powders so made | |
JPS54122103A (en) | Magnetic recording medium and production of the same |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |