GB620269A - Improvements in or relating to magnetic dust cores - Google Patents
Improvements in or relating to magnetic dust coresInfo
- Publication number
- GB620269A GB620269A GB125147A GB125147A GB620269A GB 620269 A GB620269 A GB 620269A GB 125147 A GB125147 A GB 125147A GB 125147 A GB125147 A GB 125147A GB 620269 A GB620269 A GB 620269A
- Authority
- GB
- United Kingdom
- Prior art keywords
- water
- per cent
- hour
- heated
- glass
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Powder Metallurgy (AREA)
- Developing Agents For Electrophotography (AREA)
- Soft Magnetic Materials (AREA)
Abstract
620,269. Powdered magnetic cores. GENERAL ELECTRIC CO., Ltd., and BARDELL, P. R. Jan. 14, 1947, No. 1251. [Class 38 (ii)] In manufacturing a magnetic dust core, a mixture containing magnetic powder, 1.5 to 3.0 per cent by weight of water-glass and 3.5 to 10.0 per cent by weight of china clay, is heated for at least one hour at 550‹ to 650‹ C., and then shaped under pressure. The china clay and water-glass may be made into a paste with water and methylated spirit in a paddle mixer before mixing with the magnetic powder, which may be a 1:4 nickel-iron alloy. The total mixture is heated for several hours at 150‹ C., then at 550‹ to 650‹ C. for at least one hour, 1 per cent by weight of talc is added, the core is compressed at 50-100 tons/sq. inch into a suitable shape, e.g. an annulus, and then heated for one hour at 570-600‹ C. and cooled at 12-35‹ C. per minute. All the heating may be done in a reducing atmosphere. The cores may be coated with synthetic resin, which is polymerized under heat. A suitable water-glass may contain 54 per cent of total solids comprising silica and sodium oxide in ratio 2: 1. Size analysis of a suitable china clay is given, as also are figures of hysteresis loss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB125147A GB620269A (en) | 1947-01-14 | 1947-01-14 | Improvements in or relating to magnetic dust cores |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB125147A GB620269A (en) | 1947-01-14 | 1947-01-14 | Improvements in or relating to magnetic dust cores |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB620269A true GB620269A (en) | 1949-03-22 |
Family
ID=9718746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB125147A Expired GB620269A (en) | 1947-01-14 | 1947-01-14 | Improvements in or relating to magnetic dust cores |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB620269A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015092002A1 (en) * | 2013-12-20 | 2015-06-25 | Höganäs Ab (Publ) | Soft magnetic powder mix |
-
1947
- 1947-01-14 GB GB125147A patent/GB620269A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015092002A1 (en) * | 2013-12-20 | 2015-06-25 | Höganäs Ab (Publ) | Soft magnetic powder mix |
| CN105873697A (en) * | 2013-12-20 | 2016-08-17 | 霍加纳斯股份有限公司 | Soft magnetic powder mix |
| CN105873697B (en) * | 2013-12-20 | 2019-05-10 | 霍加纳斯股份有限公司 | Soft magnetic powder mixture |
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