GB578250A - Improvements in or relating to magnetic dust cores - Google Patents
Improvements in or relating to magnetic dust coresInfo
- Publication number
- GB578250A GB578250A GB1640744A GB1640744A GB578250A GB 578250 A GB578250 A GB 578250A GB 1640744 A GB1640744 A GB 1640744A GB 1640744 A GB1640744 A GB 1640744A GB 578250 A GB578250 A GB 578250A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- class
- magnetic dust
- powder
- magnetic
- 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
-
- 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
- H01F1/12—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 soft-magnetic materials
- H01F1/14—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 soft-magnetic materials metals or alloys
- H01F1/20—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/22—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/24—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
- H01F1/26—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
Abstract
578,250. Magnetic dust cores. STANDARD TELEPHONES & CABLES, Ltd., and BUCKLEY, S. E. Aug. 29, 1944, No. 16407. [Class 38 (ii)] [Also in Group II] In a magnetic dust core the insulating and binding material consists of a non-reactive mixture of inorganic material with between 1 per cent. and 10 per cent. by weight of a high molecular weight organic material. Inorganic materials named are colloidal clay, magnesium hydroxide, sodium silicate, chromic acid, talc, and kaolin, while suitable organic materials are phenol formaldehyde resin, urea formaldehyde resin, polystyrene, shellac, starch, casein, gelatine, dextrin and glue. In manufacturing the core, talc may be mixed with magnetic powder prepared as described in Specification 564,651, which is then annealed, ground to a powder and mixed with the kaolin and such organic materials as are a powder. Sodium silicate and magnesium hydroxide may be added dissolved and suspended respectively in water, and gelatine may also be added in solution. After the cores have been compressed into shape, they may be heat treated to produce a desired permeability or just baked to dry and given a surface coating. The magnetic dust may be formed from an alloy containing 78 per cent. to 82 per cent. nickel, 16 per cent. to 19 per cent. iron and up to 4 per cent. molybdenum. Specifications 269,510, [Class 37], 269,511, [Class 38 (ii)], 357,537 and 438,803, [Group XXXVI], also are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1640744A GB578250A (en) | 1944-08-29 | 1944-08-29 | Improvements in or relating to magnetic dust cores |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1640744A GB578250A (en) | 1944-08-29 | 1944-08-29 | Improvements in or relating to magnetic dust cores |
Publications (1)
Publication Number | Publication Date |
---|---|
GB578250A true GB578250A (en) | 1946-06-20 |
Family
ID=10076762
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1640744A Expired GB578250A (en) | 1944-08-29 | 1944-08-29 | Improvements in or relating to magnetic dust cores |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB578250A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0175535A1 (en) * | 1984-09-12 | 1986-03-26 | Polyplastics Co. Ltd. | Magnetic composite |
CN100429024C (en) * | 2006-09-27 | 2008-10-29 | 王忠强 | Making process of high magnetic permeability iron powder core |
CN100453214C (en) * | 2006-09-27 | 2009-01-21 | 王忠强 | Making process of high temperature resistant iron powder core |
-
1944
- 1944-08-29 GB GB1640744A patent/GB578250A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0175535A1 (en) * | 1984-09-12 | 1986-03-26 | Polyplastics Co. Ltd. | Magnetic composite |
CN100429024C (en) * | 2006-09-27 | 2008-10-29 | 王忠强 | Making process of high magnetic permeability iron powder core |
CN100453214C (en) * | 2006-09-27 | 2009-01-21 | 王忠强 | Making process of high temperature resistant iron powder core |
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