US2877183A - Method for improving the magnetic properties of ferrite with a rectangular-shaped hysteresis loop - Google Patents

Method for improving the magnetic properties of ferrite with a rectangular-shaped hysteresis loop Download PDF

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Publication number
US2877183A
US2877183A US569704A US56970456A US2877183A US 2877183 A US2877183 A US 2877183A US 569704 A US569704 A US 569704A US 56970456 A US56970456 A US 56970456A US 2877183 A US2877183 A US 2877183A
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Prior art keywords
ferrite
hysteresis loop
rectangular
improving
magnetic properties
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Expired - Lifetime
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US569704A
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English (en)
Inventor
Eckert Oskar
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Steatit Magnesia AG
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Steatit Magnesia AG
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    • 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
    • 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

Definitions

  • Fig. 1 represents a hysteresis loop of a ring core ideally corresponding to the above conditions
  • Fig. 2 represents the hysteresis loop of another ring core not satisfying the requirements.
  • Ferrites of the system MgO--MnO-Fe203' which show rectangular hysteresis loops, generally have a rather large coercive force of about ⁇ 1.5-3 ampere .windings/ cm., and the requirement H2:H1 2 can generally not always be fulfilled.
  • the invention relates to a magnesium-manganese ferrite with rectangularly shaped hysteresis loop and its object is thecreation of an extended ferrite system of this type which permits the controllable regulation ofthe coercive force and of the relation H2:H1. In accordance with the invention, this is accomplished because the ferrite contains lead compounds.
  • suchlead compounds are used in the raw mixtures which react in ceramic firing either directly or after decompositionwith the iron oxide existing in the mixture, and form leadferrite (PbFe2O4)-
  • leadferrite PbFe2O4
  • separately prepared lead ferrite in quantities up to 10% of weight, calculated on the weight of the basic mixture, may be added to the pre-sintered basic mixture before the ceramic forming and firing.
  • the invention is illustrated by the following example.
  • a ferrite powder is prepared. This is reground and ring cores are pressed therefrom according to ceramic production methods, whereupon the ring cores are subjected to a sintering fire at 1350, and kept on this temperature for a period of two hours in normal atmosphere.
  • the cores are dense and have the following properties:
  • the production of the lead ferrite may be carried out jointly with the pro duction of the other ferrite components in a simultaneous sinter-iiring. It has been noted, however, that a greater consistency is assured when the lead ferrite is produced separately and added to the basic frit.y
  • a magnesium manganese ferrite at least 90--99% thereof consisting essentially of the components MnO, MgO and Fe203, the remaining 1-10% consisting of lead ferrite (PbFe2O4).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Magnetic Ceramics (AREA)
  • Soft Magnetic Materials (AREA)
US569704A 1955-03-11 1956-03-06 Method for improving the magnetic properties of ferrite with a rectangular-shaped hysteresis loop Expired - Lifetime US2877183A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST9570A DE1010441B (de) 1955-03-11 1955-03-11 Verfahren zur Verbesserung der magnetischen Eigenschaften von Ferriten mit rechteckfoermiger Hystereseschleife

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US2877183A true US2877183A (en) 1959-03-10

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US569704A Expired - Lifetime US2877183A (en) 1955-03-11 1956-03-06 Method for improving the magnetic properties of ferrite with a rectangular-shaped hysteresis loop

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US (1) US2877183A (fr)
DE (1) DE1010441B (fr)
FR (1) FR1148632A (fr)
GB (1) GB834230A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2981688A (en) * 1960-05-27 1961-04-25 Steatite Res Corp Ferrites for microwave applications
US2987481A (en) * 1956-10-15 1961-06-06 Ibm Manganese-zinc ferrite
US3042617A (en) * 1958-12-31 1962-07-03 Rca Corp Magnetic bodies and methods of preparation thereof
US3043776A (en) * 1957-04-18 1962-07-10 Philips Corp Ferromagnetic oxidic material
US3065181A (en) * 1956-09-24 1962-11-20 Sprague Electric Co Inductor materials
US3108074A (en) * 1960-08-12 1963-10-22 Ibm Technique for processing ferrite cores
US3337461A (en) * 1962-08-01 1967-08-22 Westinghouse Electric Corp Two-phase ferrite magnet composition and method for preparing same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE516395A (fr) * 1951-12-21
GB735375A (en) * 1952-02-07 1955-08-17 Steatite Res Corp Ferromagnetic ceramic materials with hysteresis loops of rectangular shape
US2736708A (en) * 1951-06-08 1956-02-28 Henry L Crowley & Company Inc Magnetic compositions

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736708A (en) * 1951-06-08 1956-02-28 Henry L Crowley & Company Inc Magnetic compositions
BE516395A (fr) * 1951-12-21
GB735375A (en) * 1952-02-07 1955-08-17 Steatite Res Corp Ferromagnetic ceramic materials with hysteresis loops of rectangular shape

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065181A (en) * 1956-09-24 1962-11-20 Sprague Electric Co Inductor materials
US2987481A (en) * 1956-10-15 1961-06-06 Ibm Manganese-zinc ferrite
US3043776A (en) * 1957-04-18 1962-07-10 Philips Corp Ferromagnetic oxidic material
US3042617A (en) * 1958-12-31 1962-07-03 Rca Corp Magnetic bodies and methods of preparation thereof
US2981688A (en) * 1960-05-27 1961-04-25 Steatite Res Corp Ferrites for microwave applications
US3108074A (en) * 1960-08-12 1963-10-22 Ibm Technique for processing ferrite cores
US3337461A (en) * 1962-08-01 1967-08-22 Westinghouse Electric Corp Two-phase ferrite magnet composition and method for preparing same

Also Published As

Publication number Publication date
DE1010441B (de) 1957-06-13
FR1148632A (fr) 1957-12-12
GB834230A (en) 1960-05-04

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