US3032503A - Composition of magnetic core material and method of producing same - Google Patents

Composition of magnetic core material and method of producing same Download PDF

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Publication number
US3032503A
US3032503A US818126A US81812659A US3032503A US 3032503 A US3032503 A US 3032503A US 818126 A US818126 A US 818126A US 81812659 A US81812659 A US 81812659A US 3032503 A US3032503 A US 3032503A
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mol
oxide
core material
carbonate
temperature
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Sixtus Klaus
Reichel Karl
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Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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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
    • C04B35/265—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

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  • the present invention relates to a new composition of magnetic core material and method of producing the same. More in particular, the present invention relates to a new composition of magnetic core material and a method of producing such magnetic core material having a substantially rectangular hysteresis loop.
  • Magnetic core material having a substantially rectangular hysteresis loop is used for example, in switches, for storage purposes, or in magnetic amplifiers.
  • core material having a substantially rectangular hysteresis loop comprising magnetizable ceramic material containing iron oxide, magnesium oxide, and manganese oxide.
  • a hysteresis loop is obtained having a remanence B of up to 3000 gausses, a coercive force of from 5 to 80 oersteds, and a squareness ratio R, from 0.5 to 0.95. Even these values are obtained only in the direction in which the core material has been exposed to the magnetic field during heat treatment, whereas the hysteresis loop has retained its normal, S-shaped configuration in all other directions.
  • All these known core materials and the methods of producing them are unsatisfactory. In addition to a rectangular hysteresis loop it is extremely desirable for several purposes to have a high remanence but at the same time a low coercive force.
  • Such core materials are used, for example, in magnetic amplifiers, in switching and counting devices and in digital computers.
  • the known core materials, their particular composition and the methods for producing them do not meet these requirements. They do not accomplish the triple purpose of providing for core materials having, at the same time, a substantially rectangular hysteresis loop, a high remanence and a low coercive force.
  • the last mentioned method of exposing the core material to the influence of heat and a magnetic field is complicated and costly.
  • the core material is composed of the following materials in the following ratio:
  • C00, NiO and CuO is one.
  • the mol ratio between the iron oxide and the total of the other oxides is in the range of from 0.8 to 1:1.
  • CuO copper oxide
  • the metal oxides or compounds giving off the oxides when heated are pulverized, mixed and subjected to a first sintering process in air and at a temperature of from 800 to 1000 C., whereupon the cores are molded, which are then subjected to a second, main sintering operation in oxygen and at a temperature of from 1200 to 1400" C.
  • the cobalt compound which is to furnish the necessary share of C00 in the core material is added only after the other substances have gone through the aforementioned first sintering operation.
  • a certain quantity of iron oxide is mixed, for example with nickel carbonate, zinc carbonate and cobalt carbonate of such quantities, that the abovedescribed mol ratio is obtained.
  • the mixture is then finely ground, with water being added, in a grinding mil-l as, e.g., a ball mill; Two hours will be sufficient to effect this wet grinding operation.
  • This finely ground mixture is then dried. Thereafter, it is exposed to a first sintering process.
  • the sintering is done in air or oxygen at a temperature taken from the range of from 800 to 1000" C., and for a period of about two hours.
  • the sintered product is ground again in a suitable grinding mill, such as a ball mill, with water being added.
  • the product is dried and then used as the material for molding annular cores, in a manner known per se. These cores are then subjected to a second, main sintering operation, which is done in oxygen and at a temperature of from 1200 to 1400 C.
  • Example I 58.3 grams iron oxide (Fe O 17.85 grams nickel carbonate, 24.4 grams zinc carbonate and 2.1 grams cobalt carbonate are taken, which amounts correspond to the mol ratio of 0.98 mol Fe O :0.'37 mol NiO:0.58 mol ZnO:0.05 mol CoO. These substances are mixed in a ball mill'for about two hours during which process Water is added. The mixture is then removed from the ball mill and dried. Thereafter, the dried mixture is sintered for a first time for two hours at 950 C. in air. The sintered product is then wet ground in a ball mill and thereafter dried again. Thereupon the dried product is subjected to a pressure of 0.5 ton/cm.
  • the specific electric resistance is 9 centimeters.
  • Example vll 553 grams iron oxide (F6 03), 183.2 grams nickel carbonate and 243.8 grams zinc carbonate are mixed with water for about two hours, whereupon the mixture is dried.
  • the dried mixture is then exposed to-a first sintering process in oxygen at a temperature of 900 C. and for a period of two hours.
  • To 100 grams of this mixture there are added 2.1 grams cobalt carbonate and 1.7 grams iron oxide (Fe O so as to obtain a composition having a ratio of 0.96 mol Fe O :0.38 mol NiO:0.58 mol ZnO:0.04 mol C00.
  • the mixture is then wet ground and dried.
  • the ground and dried product is then pressed as in Example I to the shape of an annular core.
  • the annular cores are then sintered in oxygen at a temperature of 1250" C. for two hours.
  • the specific electric resistance is 2.10 9 centimeters.
  • Example III 553 grams iron oxide (Fe O 183.2 grams nickel carbonate and 24.3.8 grams Zinc carbonate are mixed, dried and sintered in oxygen for two hours at a temperature of 900 C. To 100 grams of this sintered mixture there are added 0.64 gram cobalt carbonate and 2.2 grams iron oxide so as to have a composition with the ratio of 0.98 mol Fe O :0.398 mol NiO:0.59 mol ZnO:0.012 mol CoO. This mixture is then wet ground and dried whereupon the annular cores are formed. These are then exposed to a sintering process in oxygen at a temperature of 1250 C. and for a period of two hours.
  • Magnetic coremateiial having a substantially rectangular hysteresis loop, composed of iron oxide, zinc oxide, cobalt oxide, and nickel 3.
  • iron oxide Fe Q nickel carbonate, zinc carbonate and cobalt carbonate

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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)
  • Soft Magnetic Materials (AREA)
  • Magnetic Ceramics (AREA)
US818126A 1958-06-04 1959-06-04 Composition of magnetic core material and method of producing same Expired - Lifetime US3032503A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL30537A DE1182129B (de) 1958-06-04 1958-06-04 Verfahren zur Herstellung eines magnetischen Kernmaterials mit nahezu rechteckfoermiger Hystereseschleife

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US3032503A true US3032503A (en) 1962-05-01

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US818126A Expired - Lifetime US3032503A (en) 1958-06-04 1959-06-04 Composition of magnetic core material and method of producing same

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US (1) US3032503A (de)
DE (1) DE1182129B (de)
FR (1) FR1226142A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3514405A (en) * 1965-08-10 1970-05-26 Siemens Ag Ferromagnetic switching core of ferrite with rectangular hysteresis loop and process for the production thereof
US5626789A (en) * 1991-09-11 1997-05-06 American Research Corp. Of Virginia Ferrimagnetic core materials for megahertz frequency high flux density transformers and inductors
US6071430A (en) * 1996-04-05 2000-06-06 Thomson-Csf Low-loss ferrite working between 1 MHZ and 100 MHZ and method of manufacture
US6436307B1 (en) * 1999-06-29 2002-08-20 Thomson-Csf Low loss ferrites

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656319A (en) * 1949-01-03 1953-10-20 Aladdin Ind Inc Magnetic core composition and method of producing the same
FR1100865A (fr) * 1954-03-05 1955-09-26 Matériaux magnétiques à base d'oxydes pour la réalisation de bandes d'enregistrement magnétique
US2723239A (en) * 1952-09-29 1955-11-08 Rca Corp Ferrospinel compositions
US2736708A (en) * 1951-06-08 1956-02-28 Henry L Crowley & Company Inc Magnetic compositions
GB752659A (en) * 1953-11-06 1956-07-11 Acec Improvements in and relating to ferrite compositions
FR1160057A (fr) * 1955-10-20 1958-07-07 Steatit Magnesia Ag Ferrites à boucle d'hystérésis magnétique étranglée
US2860105A (en) * 1953-12-21 1958-11-11 Philips Corp Method of manufacturing ferromagnetic cores

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT168523B (de) * 1946-03-27 1951-06-25 Philips Nv Magnetischer Kern für 1000 kHz übersteigende Frequenzen und Verfahren zu seiner Herstellung
NL81425C (de) * 1950-05-10
DE1017521B (de) * 1953-11-27 1957-10-10 Steatit Magnesia Ag Verfahren zur Herstellung ferromagnetischer, keramischer Koerper mit hoher Guete bei Hochfrequenz
DE1070540B (de) * 1955-07-01 1959-12-03

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656319A (en) * 1949-01-03 1953-10-20 Aladdin Ind Inc Magnetic core composition and method of producing the same
US2736708A (en) * 1951-06-08 1956-02-28 Henry L Crowley & Company Inc Magnetic compositions
US2723239A (en) * 1952-09-29 1955-11-08 Rca Corp Ferrospinel compositions
GB752659A (en) * 1953-11-06 1956-07-11 Acec Improvements in and relating to ferrite compositions
US2860105A (en) * 1953-12-21 1958-11-11 Philips Corp Method of manufacturing ferromagnetic cores
FR1100865A (fr) * 1954-03-05 1955-09-26 Matériaux magnétiques à base d'oxydes pour la réalisation de bandes d'enregistrement magnétique
FR1160057A (fr) * 1955-10-20 1958-07-07 Steatit Magnesia Ag Ferrites à boucle d'hystérésis magnétique étranglée

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3514405A (en) * 1965-08-10 1970-05-26 Siemens Ag Ferromagnetic switching core of ferrite with rectangular hysteresis loop and process for the production thereof
US5626789A (en) * 1991-09-11 1997-05-06 American Research Corp. Of Virginia Ferrimagnetic core materials for megahertz frequency high flux density transformers and inductors
US6433299B1 (en) 1991-09-11 2002-08-13 American Research Corporation Of Virginia Monolithic magnetic modules for integrated planar magnetic circuitry and process for manufacturing same
US6071430A (en) * 1996-04-05 2000-06-06 Thomson-Csf Low-loss ferrite working between 1 MHZ and 100 MHZ and method of manufacture
US6436307B1 (en) * 1999-06-29 2002-08-20 Thomson-Csf Low loss ferrites

Also Published As

Publication number Publication date
DE1182129B (de) 1964-11-19
FR1226142A (fr) 1960-07-08

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