US2068658A - Inductance coil core - Google Patents
Inductance coil core Download PDFInfo
- Publication number
- US2068658A US2068658A US731465A US73146534A US2068658A US 2068658 A US2068658 A US 2068658A US 731465 A US731465 A US 731465A US 73146534 A US73146534 A US 73146534A US 2068658 A US2068658 A US 2068658A
- Authority
- US
- United States
- Prior art keywords
- iron
- cores
- inductance coil
- core
- particles
- 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 - Lifetime
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 31
- 239000011162 core material Substances 0.000 description 25
- 239000002245 particle Substances 0.000 description 16
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000001464 adherent effect Effects 0.000 description 1
- DNEHKUCSURWDGO-UHFFFAOYSA-N aluminum sodium Chemical compound [Na].[Al] DNEHKUCSURWDGO-UHFFFAOYSA-N 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 229910052851 sillimanite Inorganic materials 0.000 description 1
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.]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Soft Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Description
Patented Jan. .26, 1937 PATENT OFFICE INDUCTANCE COIL CORE Irvin W. Cox, Chicago, Ill., assignor to Associated Electric Laboratories, Inc., Chicago, Ill., a corporation of Delaware No Drawing. Application June 20, 1934, Serial No. 731,465
3 Claims.
My invention relates in general to an inductance coil core and more specifically to a core for use with loading coils in telephone circuits or other like coils andto the method of making the core.
Among the objects of the invention are to provide an inductance 'coil core of higher permeability and lower losses than heretofore obtained,
which is made .from an easily workable material formed at high pressure into cores and which may be heat treated at a temperature near or above the melting point of iron in the presence of hydrogen without damage to the particles forming the core or to the insulating material therein.
My improved core is formed in the following manner. As a core material I use fine iron powder obtained in known manner. The iron powder is first tumbled in moist air and steam at a temperature of approximately 100 C. long enough to provide each particle with a film of iron oxide of controlled thickness. The. particles are then tumbled in a rotating vacuum furnace at about 800 C., which may contain a compartment containing aluminum, in such a manner that the vapor from the aluminum passes through the irondust at an elevated temperature and the iron oxide film over theparticles is thus replaced by an adherent aluminum oxide film of uniform controllable thickness in intimate contact witheach particle. The reaction takes place according to the equations:
Any other method of introducing aluminum vapor into the furnace will serve. In this process any metal other thanaluminum whose oxide is an electrical insulator and which is not reduced by hydrogen maybe used. In this manner the iron component of the iron oxide film is reduced in the aluminum oxide film so that the insulating film is itself permeable to some extent, and the thickness of the aluminum film is controlled or determined by the thickness of the iron oxide on the particles. v
The iron dust, each particle of which now has an aluminum oxide skin or envelope, is now mixed with a small amount of moistened ceramic refractory material suchas alundum or sodium aluminum silicate and pressed into rings or cores by well known methods.
After the core material is formed into cores or rings the rings are heat treated in a tubular furnace at a temperature which may be slightly higher than the melting point of iron. When the cores are ring shaped the inner tube of the furnace may be of porous alundum which fits into the hole of the rings and the outer tube may be of sillimanite fitting the outer diameter 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 of the cores. Due to the fact that the aluminum oxide film remains stable in an atmosphere of hydrogen at a temperature above the melting point of iron the particles remain in their normal state and acquire a high degree of permeability under this high heat treatment.
It will thus be seen that this method will produce a magnet core of high permeability and low losses due to the small space required for the insulating film and also due to the high heat treatment possible. The aluminum oxide film is nonconducting and heat resisting and due to the film itself containing reduced iron in a state of molecular subdivision it has some ferro magnetic permeability and thus tends to increase the permeability of the whole core.
Having described the process or method of forming the core what I consider to be new and desire to have protected by United States Letters Patent will be pointed out in the appended claims.
What is claimed is:
1. A method of making inductance coil cores of iron particles which consists in first forming an iron oxide film around each particle, of heating the iron particles in the presence of aluminum vapor to transform the iron oxide film into a film having different characteristics but which contains the reduced iron occluded in the new film being in a nearly molecular state of subdivision, of mixing the insulated particles with a binder, and then forming said particles into cores at high pressure.
2. The method of making inductance coil cores which consists in forming an insulating film around iron particles which film is stable in an atmosphere of hydrogen at a temperature equal to the melting point of iron, of forming the partices into cores at high pressure with a ceramic binder, and subjecting the cores to a heat treatment at the melting temperature of iron in a current of hydrogen containing a trace of water vapor.
3. A method of manufacturing inductance coil cores which consists in oxidizing the surface of iron particles to a predetermined thickness, of roasting the particles in the. presence of aluminum vapor at about 800 C. to cause aluminum to replace the iron in the oxidized surface and form a film of aluminum oxide ALzOa, containing a portion-of reduced iron in a state of molecular subdivision, of mixing the insulated particles with a small amount of ceramic binder and forming them into cores at high pressure, and then heat treating the cores at the melting point of Iron in a. current of hydrogen containing a. trace 0! water vapor for a period of hours.
IRVIN W. COX.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US731465A US2068658A (en) | 1934-06-20 | 1934-06-20 | Inductance coil core |
NL73485A NL41776C (en) | 1934-06-20 | 1935-05-08 | Method of manufacturing magnetic cores for Pupin coils and the like |
BE409383A BE409383A (en) | 1934-06-20 | 1935-05-09 | Magnetic core and its manufacturing process |
DEA75993D DE659388C (en) | 1934-06-20 | 1935-05-11 | Process for the production of mass cores |
GB13980/35A GB456739A (en) | 1934-06-20 | 1935-05-13 | Improvements in or relating to the production of magnetic cores |
FR789996D FR789996A (en) | 1934-06-20 | 1935-05-14 | Improvements to magnetic cores and their production processes |
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 |
---|---|
US2068658A true US2068658A (en) | 1937-01-26 |
Family
ID=24939618
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US731465A Expired - Lifetime US2068658A (en) | 1934-06-20 | 1934-06-20 | Inductance coil core |
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 (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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 |
EP0088992A2 (en) * | 1982-03-17 | 1983-09-21 | Asea Ab | Method for manufacturing an object of soft-magnetic material by bonding together a mass of powder grains |
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 |
Families Citing this family (5)
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 |
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 |
DE19735271C2 (en) * | 1997-08-14 | 2000-05-04 | Bosch Gmbh Robert | Soft magnetic, mouldable composite material and process for its production |
-
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 (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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 |
EP0088992A2 (en) * | 1982-03-17 | 1983-09-21 | Asea Ab | Method for manufacturing an object of soft-magnetic material by bonding together a mass of powder grains |
EP0088992A3 (en) * | 1982-03-17 | 1984-12-19 | Asea Ab | Method for manufacturing an object of soft-magnetic material by bonding together a mass of powder grains |
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 |
Also Published As
Publication number | Publication date |
---|---|
FR789996A (en) | 1935-11-09 |
NL41776C (en) | 1937-10-15 |
DE659388C (en) | 1938-05-03 |
GB456739A (en) | 1936-11-13 |
BE409383A (en) | 1935-06-29 |
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