GB456739A - Improvements in or relating to the production of magnetic cores - Google Patents
Improvements in or relating to the production of magnetic coresInfo
- Publication number
- GB456739A GB456739A GB13980/35A GB1398035A GB456739A GB 456739 A GB456739 A GB 456739A GB 13980/35 A GB13980/35 A GB 13980/35A GB 1398035 A GB1398035 A GB 1398035A GB 456739 A GB456739 A GB 456739A
- Authority
- GB
- United Kingdom
- Prior art keywords
- iron
- aluminium
- rings
- alundum
- oxide
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 22
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 18
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract 12
- 229910052742 iron Inorganic materials 0.000 abstract 10
- 239000002245 particle Substances 0.000 abstract 8
- 239000004411 aluminium Substances 0.000 abstract 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 6
- 229910052782 aluminium Inorganic materials 0.000 abstract 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 4
- 238000000137 annealing Methods 0.000 abstract 4
- 238000010438 heat treatment Methods 0.000 abstract 4
- 229910052739 hydrogen Inorganic materials 0.000 abstract 4
- 239000001257 hydrogen Substances 0.000 abstract 4
- 229940115440 aluminum sodium silicate Drugs 0.000 abstract 2
- 239000011230 binding agent Substances 0.000 abstract 2
- 239000000919 ceramic Substances 0.000 abstract 2
- 229910010293 ceramic material Inorganic materials 0.000 abstract 2
- 239000011248 coating agent Substances 0.000 abstract 2
- 238000000576 coating method Methods 0.000 abstract 2
- 238000010410 dusting Methods 0.000 abstract 2
- 230000000694 effects Effects 0.000 abstract 2
- 238000002844 melting Methods 0.000 abstract 2
- 230000008018 melting Effects 0.000 abstract 2
- 238000000034 method Methods 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 2
- 230000002035 prolonged effect Effects 0.000 abstract 2
- 229910052851 sillimanite Inorganic materials 0.000 abstract 2
- 239000000429 sodium aluminium silicate Substances 0.000 abstract 2
- 235000012217 sodium aluminium silicate Nutrition 0.000 abstract 2
- 238000006467 substitution reaction Methods 0.000 abstract 2
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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12181—Composite powder [e.g., coated, etc.]
Abstract
A magnetic core suitable for a loading coil is formed by pressing together with a ceramic binder iron particles individually insulated with a coating of aluminium oxide and annealing by prolonged heating at about the melting temperature of iron in an atmosphere of hydrogen. Finely - divided iron powder is tumbled in a mixture of air and steam at a temperature of about 100 DEG C. to produce a film of iron oxide on each particle of the desired thickness. The particles are then tumbled in a rotating vacuum furnace operating at about 800 DEG C. and having a compartment containing aluminium. The aluminium vapour reacts with the iron oxide to produce a film of aluminium oxide containing metallic iron in a state of molecular subdivision. The coated iron particles are then mixed with moistened ceramic material such as alundum or sodium aluminium silicate and pressed into rings or cores, which are then annealed at a temperature slightly higher than the melting-point of iron. In the case of ring-shaped cores the annealing may be effected in a tubular furnace having an inner tube of porous alundum, fitting the central hole in the rings, and an outer tube of sillimanite fitting the outside of the rings. A dusting of alundum is used to separate the rings from each other and from the walls of the furnace. Moist hydrogen is passed through the furnace during the heat treatment. Other methods of treating the iron oxide with aluminium so as to effect a substitution may be used.ALSO:A magnetic core suitable for a leading coil is formed by pressing together with a ceramic binder iron particles individually insulated with a coating of aluminium oxide and annealing by prolonged heating at about the melting temperature of iron in an atmosphere of hydrogen. Finely-divided iron powder is tumbled in a mixture of air and steam at a temperature of about 100 DEG C. to produce a film of iron oxide on each particle of the desired thickness. The particles are then tumbled in a rotating vacuum furnace operating at about 800 DEG C. and having a compartment containing aluminium. The aluminium vapour reacts with the iron oxide to produce a film of aluminium oxide containing metallic iron in a state of molecular subdivision. The coated iron particles are then mixed with moistened ceramic material such as alundum or sodium aluminium silicate and pressed into rings or cores, which are then annealed at a temperature slightly higher than the melting-point of iron. In the case of ring-shaped cores the annealing may be effected in a tubular furnace having an inner tube of porous alundum, fitting the central hole in the rings, and an outer tube of sillimanite fitting the outside of the rings. A dusting of alundum is used to separate the rings from each other and from the walls of the furnace. Moist hydrogen is passed through the furnace during the heat treatment. Other methods of treating the iron oxide with aluminium so as to effect a substitution may be used.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US731465A US2068658A (en) | 1934-06-20 | 1934-06-20 | Inductance coil core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB456739A true GB456739A (en) | 1936-11-13 |
Family
ID=24939618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13980/35A Expired GB456739A (en) | 1934-06-20 | 1935-05-13 | Improvements in or relating to the production of magnetic cores |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2068658A (en) |
| BE (1) | BE409383A (en) |
| DE (1) | DE659388C (en) |
| FR (1) | FR789996A (en) |
| GB (1) | GB456739A (en) |
| NL (1) | NL41776C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19735271A1 (en) * | 1997-08-14 | 1999-02-25 | Bosch Gmbh Robert | Weakly magnetic deformable composite substance |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE910941C (en) * | 1941-08-12 | 1954-05-10 | Siemens Ag | Process for isolating easily oxidizable, magnetizable particles, especially for mass cores of high frequency technology |
| US2565861A (en) * | 1947-09-26 | 1951-08-28 | Rca Corp | Magnetic materials |
| US2809275A (en) * | 1952-06-18 | 1957-10-08 | Philips Corp | Method of manufacturing stud welding cartridges and method of welding |
| DE1173196B (en) * | 1955-06-03 | 1964-07-02 | Siemens Ag | Process for the production of a soft-magnetic sintered body with high permeability and small eddy current losses |
| DE1195882B (en) * | 1955-06-08 | 1965-07-01 | Siemens Ag | Process for the production of a soft magnetic sintered body |
| DE1037351B (en) * | 1955-08-24 | 1958-08-21 | Licentia Gmbh | Magnetic mixed material made of metallic and metal oxide components as well as process for its production |
| US2873512A (en) * | 1955-10-13 | 1959-02-17 | Sprague Electric Co | Ferro magnetic core materials and methods of producing same |
| US3004918A (en) * | 1956-05-01 | 1961-10-17 | Bell Telephone Labor Inc | Production of magnetic ferrite bodies |
| US3180021A (en) * | 1962-11-21 | 1965-04-27 | James N Cordea | Weld joint backing and method of welding with same |
| SE8201678L (en) * | 1982-03-17 | 1983-09-18 | Asea Ab | SET TO MAKE FORMS OF SOFT MAGNETIC MATERIAL |
| US5069972A (en) * | 1988-09-12 | 1991-12-03 | Versic Ronald J | Moldable microcapsule that contains a high percentage of solid core material, and method of manufacture thereof |
-
1934
- 1934-06-20 US US731465A patent/US2068658A/en not_active Expired - Lifetime
-
1935
- 1935-05-08 NL NL73485A patent/NL41776C/en active
- 1935-05-09 BE BE409383A patent/BE409383A/en unknown
- 1935-05-11 DE DEA75993D patent/DE659388C/en not_active Expired
- 1935-05-13 GB GB13980/35A patent/GB456739A/en not_active Expired
- 1935-05-14 FR FR789996D patent/FR789996A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19735271A1 (en) * | 1997-08-14 | 1999-02-25 | Bosch Gmbh Robert | Weakly magnetic deformable composite substance |
| DE19735271C2 (en) * | 1997-08-14 | 2000-05-04 | Bosch Gmbh Robert | Soft magnetic, mouldable composite material and process for its production |
Also Published As
| Publication number | Publication date |
|---|---|
| FR789996A (en) | 1935-11-09 |
| US2068658A (en) | 1937-01-26 |
| NL41776C (en) | 1937-10-15 |
| DE659388C (en) | 1938-05-03 |
| BE409383A (en) | 1935-06-29 |
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