GB1428000A - Magnetic materials for magnetic circuits - Google Patents

Magnetic materials for magnetic circuits

Info

Publication number
GB1428000A
GB1428000A GB957573A GB957573A GB1428000A GB 1428000 A GB1428000 A GB 1428000A GB 957573 A GB957573 A GB 957573A GB 957573 A GB957573 A GB 957573A GB 1428000 A GB1428000 A GB 1428000A
Authority
GB
United Kingdom
Prior art keywords
heating
temperature
transformation
materials
march
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
Application number
GB957573A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lignes Telegraphiques et Telephoniques LTT SA
Original Assignee
Lignes Telegraphiques et Telephoniques LTT SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from FR7207816A external-priority patent/FR2174683A1/en
Priority claimed from FR7210779A external-priority patent/FR2177508A1/en
Application filed by Lignes Telegraphiques et Telephoniques LTT SA filed Critical Lignes Telegraphiques et Telephoniques LTT SA
Publication of GB1428000A publication Critical patent/GB1428000A/en
Expired legal-status Critical Current

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
    • H01F1/34—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 non-metallic substances, e.g. ferrites
    • H01F1/36—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 non-metallic substances, e.g. ferrites in the form of particles
    • H01F1/37—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 non-metallic substances, e.g. ferrites in the form of particles in a bonding agent
    • 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
    • C04B35/265—Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt
    • 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
    • C04B35/2675—Other ferrites containing rare earth metals, e.g. rare earth ferrite garnets
    • 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
    • H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
    • H01F1/0311—Compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/32—Non-reciprocal transmission devices
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
    • Y10T29/49076—From comminuted material

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

1428000 Ferrimagnetic materials LIGNES TELEGRAPHIQUES ET TELEPHONIQUES 27 Feb 1973 [7 March 1972 28 March 1972] 9575/73 Heading C1J A solid magnetic body with a spatially uneven distribution of permeability is manufactured by heating a sintered body of polycrystalline ferrimagnetic material F 1 at a temperature to initiate transformation of the material F, into another ferrimagnetic material F 2 , the free energy of F 2 being higher than F 1 at said temperature which transformation involves passage through a liquid phase having a different chemical composition to that of F 1 , or heating in the presence of an oxide or salt of a foreign metal whereby the foreign metal ions diffuse into F 1 to form F 2 , cooling down to room temperature before the transformation is complete and machining the body such that it still consists of both F 1 and F 2 materials. Examples decribe the heating of an Fe, Y, Gd, Al garnet and a NiFn ferrite involving passage through a liquid phase and the heating of Ni ferrite below the temperature of liquefaction in the presence of CuO, FnO and B 2 O 3 and Y, Gd, Al, Fe garnet again below the liquefaction temperature in the presence of B 2 O 3 . The magnetic body may be used as a substrate for a microwave integrated circuit.
GB957573A 1972-03-07 1973-02-27 Magnetic materials for magnetic circuits Expired GB1428000A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7207816A FR2174683A1 (en) 1972-03-07 1972-03-07 Integrated microwave circuit substrate - by heating polycrystalline magnetic starting material and mechanically working
FR7210779A FR2177508A1 (en) 1972-03-28 1972-03-28 Integrated microwave circuit substrate - by heating polycrystalline magnetic starting material and mechanically working

Publications (1)

Publication Number Publication Date
GB1428000A true GB1428000A (en) 1976-03-10

Family

ID=26216961

Family Applications (1)

Application Number Title Priority Date Filing Date
GB957573A Expired GB1428000A (en) 1972-03-07 1973-02-27 Magnetic materials for magnetic circuits

Country Status (3)

Country Link
US (1) US3855691A (en)
GB (1) GB1428000A (en)
NL (1) NL7302964A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5446459A (en) * 1991-08-13 1995-08-29 Korea Institute Of Science And Technology Wide band type electromagnetic wave absorber
DE4142728C2 (en) * 1991-12-21 1996-01-11 Advanced Ferrite Tech Use of a ferrite body for microwave circuits
DE102004041649B4 (en) * 2004-08-27 2006-10-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Magnetorheological elastomers and their use
DE102004041651B4 (en) * 2004-08-27 2006-10-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Magnetorheological materials with magnetic and non-magnetic inorganic additives and their use
DE102004041650B4 (en) * 2004-08-27 2006-10-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Magnetorheological materials with high switching factor and their use
DE102007017589B3 (en) * 2007-04-13 2008-10-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Damping device with field-controllable fluid
US10619755B2 (en) * 2018-01-17 2020-04-14 Nextern, Inc. Solenoid operated valve with flux density concentration ring and molded-in valve seat

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2982948A (en) * 1957-11-01 1961-05-02 Ibm Multi-material ferrite cores
ES246988A1 (en) * 1958-02-13 1959-05-16 Itt Magnetic materials of the high permeability ferrite type
US3132105A (en) * 1962-03-14 1964-05-05 Sperry Rand Corp Temperature compensated yttrium gadolinium iron garnets
FR1430189A (en) * 1964-12-29 1966-03-04 Lignes Telegraph Telephon Ferromagnetic materials and processes for their manufacture
US3763045A (en) * 1970-04-03 1973-10-02 Nippon Electric Co Calcium-vanadium ferrimagnetic garnets

Also Published As

Publication number Publication date
US3855691A (en) 1974-12-24
NL7302964A (en) 1973-09-11

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee