GB645056A - Improved process of manufacturing magnetic material - Google Patents

Improved process of manufacturing magnetic material

Info

Publication number
GB645056A
GB645056A GB7310/47A GB731047A GB645056A GB 645056 A GB645056 A GB 645056A GB 7310/47 A GB7310/47 A GB 7310/47A GB 731047 A GB731047 A GB 731047A GB 645056 A GB645056 A GB 645056A
Authority
GB
United Kingdom
Prior art keywords
iron
oxide
ferric
active
magnetic material
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
GB7310/47A
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 GB645056A publication Critical patent/GB645056A/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
    • H01F1/342—Oxides
    • H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/02—Oxides; Hydroxides
    • C01G49/06—Ferric oxide (Fe2O3)
    • 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

Abstract

Ferromagnetic ferrites for use as magnetic cores are made by sintering in an atmosphere of oxygen a mechanical mixture of metallic oxides of which the iron oxide content is in the "active" state and free from alkali. The active oxide, recognizable by its light colour preferably between bordeaux red and orange, is produced by precipitating the hydrate of iron from an iron salt solution for example ferric chloride, with ammonia, and dehydrating the precipitate at a low temperature for example 105 DEG C., or by heating a solid iron compound such as ferric sulphate to produce ferric oxide, which is then mixed with, for example copper and zinc oxides and sintered at a temperature between 900 DEG and 1100 DEG C.
GB7310/47A 1944-05-30 1947-03-17 Improved process of manufacturing magnetic material Expired GB645056A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL645056X 1944-05-30

Publications (1)

Publication Number Publication Date
GB645056A true GB645056A (en) 1950-10-25

Family

ID=19791897

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7310/47A Expired GB645056A (en) 1944-05-30 1947-03-17 Improved process of manufacturing magnetic material

Country Status (1)

Country Link
GB (1) GB645056A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989479A (en) * 1955-11-21 1961-06-20 Steatit Magnesia Ag Ferrite with constricted magnetic hysteresis loop
US2989478A (en) * 1955-11-16 1961-06-20 Stcatit Magnesia Ag Ferrite with constricted magnetic hysteresis loop

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989478A (en) * 1955-11-16 1961-06-20 Stcatit Magnesia Ag Ferrite with constricted magnetic hysteresis loop
US3024196A (en) * 1955-11-16 1962-03-06 Steatit Magnesia Ag Ferrite with constricted magnetic hysteresis loop
US2989479A (en) * 1955-11-21 1961-06-20 Steatit Magnesia Ag Ferrite with constricted magnetic hysteresis loop
US2989477A (en) * 1955-11-21 1961-06-20 Steatit Magnesia Ag Ferrite with constricted magnetic hysteresis loop

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