GB1295440A - - Google Patents
Info
- Publication number
- GB1295440A GB1295440A GB1295440DA GB1295440A GB 1295440 A GB1295440 A GB 1295440A GB 1295440D A GB1295440D A GB 1295440DA GB 1295440 A GB1295440 A GB 1295440A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- particles
- suspension
- silica
- 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 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 6
- 239000000725 suspension Substances 0.000 abstract 6
- 239000000243 solution Substances 0.000 abstract 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract 4
- 239000012670 alkaline solution Substances 0.000 abstract 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract 2
- 229910021529 ammonia Inorganic materials 0.000 abstract 2
- -1 hydroxyl ions Chemical class 0.000 abstract 2
- 239000000377 silicon dioxide Substances 0.000 abstract 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 abstract 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 abstract 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 abstract 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract 1
- 229910020630 Co Ni Inorganic materials 0.000 abstract 1
- 229910002440 Co–Ni Inorganic materials 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 abstract 1
- 239000001099 ammonium carbonate Substances 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 230000005294 ferromagnetic effect Effects 0.000 abstract 1
- 239000003302 ferromagnetic material Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 150000002506 iron compounds Chemical class 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 150000002823 nitrates Chemical class 0.000 abstract 1
- 239000008188 pellet Substances 0.000 abstract 1
- 239000002244 precipitate Substances 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 abstract 1
- 239000000047 product Substances 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)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Compounds Of Iron (AREA)
- Oxygen, Ozone, And Oxides In General (AREA)
- Silicon Compounds (AREA)
- Soft Magnetic Materials (AREA)
Abstract
1295440 Coated particles STAMICARBON NV 17 Dec 1969 [19 Dec 1968] 61526/69 Heading C1A [Also in Division H1] Carrier particles bearing fine ferromagnetic particles or their surfaces are made by suspending the carrier particles in a solution of at least one compound of at least one metal capable of conversion to ferromagnetic material, gradually introducing an alkaline solution into the agitated suspension through a tube below the surface of the suspension, to generate hydroxyl ions and form a precipitate substantially entirely on the surfaces of the carrier particles, and then separating the loaded particles from the suspension. The rate of addition of alkaline solution is such that during the precipitation the average pH of the suspension does not increase by more than 0À1 per minute, and deviations from the average increase do not exceed 0À05 pH. If an iron compound is present in the solution, the iron ions must be divalent. The alkaline solution may be a carbonate, bicarbonate or ammonia. The separated loaded carrier particles may be dried, calcined and optionally, reduced. In Examples (1) silica particles are coated with iron oxide by adding oxygen-free Na 2 CO 3 solution to an oxygen-free suspension of silica in FeCl 2 solution; (2) silica particles are coated with Co-Ni alloy by adding ammonia and ammonium bicarbonate to a suspension of silica in a solution of nitrates, and reducing in H 2 compressed pellets of the dried product.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6800237A NL6800237A (en) | 1968-01-06 | 1968-01-06 | |
| NL6804970A NL6804970A (en) | 1968-04-09 | 1968-04-09 | |
| NL6804971A NL6804971A (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 |
|---|---|
| GB1295440A true GB1295440A (en) | 1972-11-08 |
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 (2)
| 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 |
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 |
|---|---|---|---|---|
| JPS4836163A (en) * | 1971-09-21 | 1973-05-28 | ||
| 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 FR FR6910908A patent/FR2005878A1/fr not_active Withdrawn
- 1969-04-09 SE SE05023/69A patent/SE352767B/xx unknown
- 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 DE DE1958606A patent/DE1958606C3/en not_active Expired
- 1969-11-21 BE BE742017D patent/BE742017A/xx unknown
- 1969-11-21 FR FR6940166A patent/FR2030660A5/fr not_active Expired
- 1969-11-21 SE SE16062/69A patent/SE352978B/xx unknown
- 1969-11-21 JP JP44093548A patent/JPS4912959B1/ja active Pending
- 1969-11-21 DK DK619869AA patent/DK134932B/en unknown
- 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 AT AT1186469A patent/AT297660B/en not_active IP Right Cessation
- 1969-12-19 JP JP44102388A patent/JPS526958B1/ja active Pending
- 1969-12-19 DE DE19691963828 patent/DE1963828A1/en active Pending
- 1969-12-19 FR FR6944049A patent/FR2026578A6/fr not_active Expired
- 1969-12-19 BE BE743394D patent/BE743394A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2026578A6 (en) | 1970-09-18 |
| DK134932C (en) | 1977-07-04 |
| DE1958606A1 (en) | 1970-06-18 |
| FR2005878A1 (en) | 1969-12-19 |
| DE1958606B2 (en) | 1978-07-20 |
| AT295175B (en) | 1971-12-27 |
| DE1963828A1 (en) | 1970-10-08 |
| DE1958606C3 (en) | 1979-04-19 |
| ES373717A1 (en) | 1972-04-16 |
| CH546712A (en) | 1974-03-15 |
| CH558980A (en) | 1975-02-14 |
| FR2030660A5 (en) | 1970-11-13 |
| GB1261399A (en) | 1972-01-26 |
| JPS4912959B1 (en) | 1974-03-28 |
| ES374722A2 (en) | 1972-04-01 |
| DE1917644A1 (en) | 1970-09-10 |
| SE352767B (en) | 1973-01-08 |
| DK134932B (en) | 1977-02-14 |
| GB1291064A (en) | 1972-09-27 |
| AT297660B (en) | 1972-04-10 |
| SE352978B (en) | 1973-01-15 |
| BE743394A (en) | 1970-06-19 |
| BE731186A (en) | 1969-10-08 |
| JPS526958B1 (en) | 1977-02-25 |
| BE742017A (en) | 1970-05-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |