GB626946A - Improvements in or relating to magnetic cores - Google Patents

Improvements in or relating to magnetic cores

Info

Publication number
GB626946A
GB626946A GB1403546A GB1403546A GB626946A GB 626946 A GB626946 A GB 626946A GB 1403546 A GB1403546 A GB 1403546A GB 1403546 A GB1403546 A GB 1403546A GB 626946 A GB626946 A GB 626946A
Authority
GB
United Kingdom
Prior art keywords
ferrite
heating
oxygen
copper
zinc
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
GB1403546A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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
Application filed by Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB626946A publication Critical patent/GB626946A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/0018—Mixed oxides or hydroxides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/009—Compounds containing, besides iron, two or more other elements, with the exception of oxygen or hydrogen
    • 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
    • C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
    • C04B35/2625—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing magnesium
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/30—Three-dimensional structures
    • C01P2002/32—Three-dimensional structures spinel-type (AB2O4)
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • C01P2002/76—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by a space-group or by other symmetry indications

Landscapes

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

Abstract

A magnetic core consists of a ferromagnetic mixed ferrite having a specific resistance of at least 1000 ohms-cm. cube which exhibits a homogeneous cubic crystal structure and an initial permeability of at least 60 and a loss factor less than 0.06 throughout the frequency range of 10 to 100 kc/sec. For these properties the ferrite must be fully oxidized and the oxygen loss occurring on heating during its preparation, is minimised by using as low a formation temperature as possible and oxygen is replaced by heating and cooling slowly in oxygen. To facilitate this the ferrite should be fine grained and porous. The ferrite may be produced by heating together a mixture of oxides in a fine state produced by prolonged grinding or by precipitation from a solution, and pressed into a core before or after heating. Methods are described, with appropriate proportions and details of treatment, for producing by the grinding method copper-cadmium ferrite, copper-zinc ferrite, magnesium-zinc ferrite and nickel-zine ferrite and for producing copper-zinc ferrite by the precipitation method. Curves show the relationship between frequency and tan d of a coil wound on a specified annular ferrite cores and permeabilities are stated.
GB1403546A 1941-10-24 1946-05-09 Improvements in or relating to magnetic cores Expired GB626946A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL103362 1941-10-24

Publications (1)

Publication Number Publication Date
GB626946A true GB626946A (en) 1949-07-25

Family

ID=32733175

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1403546A Expired GB626946A (en) 1941-10-24 1946-05-09 Improvements in or relating to magnetic cores

Country Status (4)

Country Link
CH (1) CH256023A (en)
DE (1) DE976355C (en)
GB (1) GB626946A (en)
NL (1) NL61937C (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH260717A (en) * 1943-05-31 1949-03-31 Philips Nv A method of manufacturing a magnetic core, and a magnetic core manufactured by this method.
US2565058A (en) * 1949-05-26 1951-08-21 Steatite Res Corp Ceramic magnetic materials with high saturation-flux density
NL82274C (en) * 1953-12-21 1956-08-15
NL82273C (en) * 1953-12-21 1956-08-15
NL82276C (en) * 1953-12-22
BE535198A (en) * 1954-01-27
FR1110334A (en) * 1954-07-13 1956-02-10 Improvements to such ferromagnetic materials

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE227787C (en) *
DE226347C (en) *
US946964A (en) * 1909-09-01 1910-01-18 J A Sauls Chalk-line holder.
US1647737A (en) * 1927-01-03 1927-11-01 Bell Telephone Labor Inc Magnetic core
US1647738A (en) * 1927-01-05 1927-11-01 Bell Telephone Labor Inc Insulation of magnetic material

Also Published As

Publication number Publication date
DE976355C (en) 1963-08-01
NL61937C (en) 1948-11-15
CH256023A (en) 1948-07-31

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