GB795906A - Non-metallic magnetic recording materials and process for producing the same - Google Patents
Non-metallic magnetic recording materials and process for producing the sameInfo
- Publication number
- GB795906A GB795906A GB1256256A GB1256256A GB795906A GB 795906 A GB795906 A GB 795906A GB 1256256 A GB1256256 A GB 1256256A GB 1256256 A GB1256256 A GB 1256256A GB 795906 A GB795906 A GB 795906A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- oxide
- water
- magnetic recording
- april
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
- C04B35/2625—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing magnesium
-
- 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
- G11B5/70678—Ferrites
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Iron (AREA)
Abstract
795,906. Magnetic compositions. MEDVEDIEFF, S. April 24, 1956 [April 27, 1955], No. 12562/56. Class 38 (2). A material suitable for use as magnetic recording medium is made by heating at about 1050‹ C. a mixture in molecular proportions of ferric oxide 40-50 per cent, magnesium oxide 10-40 per cent, cobalt oxide 10-40 per cent, zinc oxide 0-15 per cent, quenching the product in water and then grinding to powder. The magnesium oxide is preferably introduced by starting with magnesium carbonate, the preferred starting ratios in gram molecules being 45 Fe 2 0 3 ; 20-25 CoO; 15-30 MgC0 3 and 0-10 ZnO. In one example, suitable weights of the first three materials were ground for fourteen hours with water in a ball-mill, dried, screened, compressed into a cylinder sintered at 1050‹ C. for one hour and fragmented in water. After regrinding, drying and screening, the powder was heated at 250‹ C. for 12 hours in a magnetic field of 2000 oersteds and cooled to room temperature in one hour. Modifications are described in which suitable proportions of these materials and zinc oxide are used.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1129532T | 1955-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB795906A true GB795906A (en) | 1958-06-04 |
Family
ID=9636921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1256256A Expired GB795906A (en) | 1955-04-27 | 1956-04-24 | Non-metallic magnetic recording materials and process for producing the same |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR1129532A (en) |
| GB (1) | GB795906A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3026215A (en) * | 1960-03-09 | 1962-03-20 | Fuji Photo Film Co Ltd | Process of producing magnetic sound recording material in which co-ni-fe ferrite columnar particles are placed in a direct current magnetic field and oriented by means of an ultrasonic wave and afterwards heated and cooled in the direct current magnetic field |
-
1955
- 1955-04-27 FR FR1129532D patent/FR1129532A/en not_active Expired
-
1956
- 1956-04-24 GB GB1256256A patent/GB795906A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3026215A (en) * | 1960-03-09 | 1962-03-20 | Fuji Photo Film Co Ltd | Process of producing magnetic sound recording material in which co-ni-fe ferrite columnar particles are placed in a direct current magnetic field and oriented by means of an ultrasonic wave and afterwards heated and cooled in the direct current magnetic field |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1129532A (en) | 1957-01-22 |
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