US2989472A - Ferrite with constricted magnetic hysteresis loop - Google Patents

Ferrite with constricted magnetic hysteresis loop Download PDF

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Publication number
US2989472A
US2989472A US616156A US61615656A US2989472A US 2989472 A US2989472 A US 2989472A US 616156 A US616156 A US 616156A US 61615656 A US61615656 A US 61615656A US 2989472 A US2989472 A US 2989472A
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ferrite
hysteresis loop
constricted
weight
magnetic hysteresis
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US616156A
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Eckert Oskar
Zerbes Georg
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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
    • C04B35/265—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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  • thermomagnetic treatment in this connection, is meant the passing through a thermic cycle during the simultaneous presence of a magnetic longitudinal or transverse field.
  • longitudinal or transverse field is, in this connection, to be understood as relative to the later measuring field; a longitudinal or transverse field, respectively, means that such field, during the thermomagnetic treatment, is parallel, respectively vertical, to the later measuring field.
  • nickel-zincferrites with constricted hysteresis loop there exist nickel-zincferrites with constricted hysteresis loop, and it was claimed that, for instance, nickel-zinc-ferrites obtain a constricted hysteresis loop by the addition of manganese oxide and cobalt oxide.
  • this claim is completely wrong; there are only very specific ferrites showing a constricted magnetic hysteresis loop which are, consequently, susceptible to thermomagnetic treatment similarly to the metals.
  • the invention teaches the production of such ferrites of the nickel-zinc-ferrite system which can be subjected to thermomagnetic treatment of the above type, and are distinguished from hitherto familiar ferrites by the fact that, under the same manufacturing conditions, they have constricted hysteresis loops.
  • ferrites with this characteristics in the nickel-zincferrite system must have a composition of at least 50 mol percent Fe O and a small addition of cobalt oxide.
  • the addition of cobalt oxide is suitably determined between 0.1 and 5% by weight, calculated on the total basic batch of the nickelzinc-ferrite, expressed in metallic oxides.
  • the invention has shown that it is particularly advantageous to choose the cobalt oxide content between 0.35 and 1% by weight, calculated on the basic batch.
  • the nickel-zinc-ferrites in question which react strongly to the addition of cobalt oxide with a constricted loop, cover, in the three-component system Fe O -NiO-ZnO the area defined in FIG. 4 of the drawing by the pentagon A, B, C, D, E.
  • the compositions of the corner points in percent by weight are:
  • the above fern'tes may be prepared in the usual way,
  • the powdered mixtures thus obtained may be given the desired form either immediately by dry pressing, extruding, or similar methods, or itmay be desirable, before ceramic forming, to proceed with a calcining firing of the whole or only a part thereof preferablybetween about 750 and 1150 C.
  • the thus obtained parts are subjected to a sintering firing, suitably between 1250 C. and 1380 0., depending on the composition.
  • the cooling takes place slowly, particularly in the temperature range between 700 C. and room temperature.
  • the cooling speed is dependent upon the volume of the fired body. As a criterion, it may be stated that for a ring of about 46 mm. outside diameter, 34 mm. inside diameter,'and 10 mm. height, the cooling time from 700 C. to room temperature should take not less than 12 hours. If the rings are cooled rapidly, the effect of loop constriction does not occur. However, the constriction may be regained even for n'ngs cooled too rapidly, by re-heating them to a temperature of about 700 C., and cooling them slowly, as above described.
  • the rings are cooled to room tepreature in the kiln during a period of approximately 24 hours.
  • the ferrite rings thus obtained are provided with 0.4 mm. copper enamelled wire with windings as primary winding, and, as secondary winding, further 200 windings with 0.2 mm. copper enamelled 'wire are applied.
  • the oscillographic photograph of this ferrite, produced in accordance with the invention, is shown in FIG. 1.
  • the ferrite toroid of this example with 100 windings as a primary winding, is placed in a kiln. While heating to 600 C., and slow cooling for 12 hours to room temperature, a longitudinal magnetic field is maintained by means of the ring winding by l a. direct current, corresponding to a magnetic field strength of about 15 a.- windings/cm. If the hysteresis loop of the ferrite after this thermo-magnetic treatment is recorded in the same manner as described above, the result is analogous to that of metals when they are subjected to heat treatment in the longitudinal magnetic field; a complete change of the form of the hysteresis loop, as may be seen in FIG. 3 takes place.
  • a process of making a ferrite body with a constricted hysteresis loop which ferrite body is susceptible to thermomagnetic treatment to change the hysteresis loop characteristics comprising providing a milled powder mixture consisting essentially of nickel oxide, from 1 to about 16.5% by weight of zinc oxide, 0.1 to 5% by weight of cobalt oxide and at least about 71% by weight and at least 50 mol percent of ferric oxide based on the total metal oxide content of the mixture, forming the powder mixture to the shape desired, sintering the shaped product at about 1250 C. to 1380 C., and thereafter, slowly cooling the sintered body from 700 C. down to room temperature over a period of at least about 12 hours.
  • a process of making a ferrite body with a constricted hysteresis loop which ferrite body is susceptible to thermomagnetic treatment to change the hysteresis loop characteristics comprising providing a milled powder mixture consisting essentially of nickel oxide, from 1 to about 16.5% by weight of Zinc oxide, 0.1 to 5% by weight of cobalt oxide and at least about 71% by weight and at least mol percent of ferric oxide based on the total metal oxide content of the mixture, forming the powder mixture to the shape desired, sintering the shaped product at about 1250 C. to 1380 C., cooling the sintered product, thereafter reheating the sintered product to a temperature of about 700 C. and then slowly cooling to room temperature over a period of at least 12 hours.
  • a fired body of a ferrite of the nickel-zinc ferrite system having a constricted magnetic hysteresis loop which ferrite body is susceptible to thermomagnetic treatment to change the hysteresis loop characteristics said ferrite containing about 0.1 to 5% by weight of cobalt oxide, 71 to 89% by weight and at least 50 mol percent of ferric oxide calculated on the total metal oxide content of the system, about '1 to 16.5% by weight of ZnO and the remainder comprising at least 1% by' weight, being NiO, said ferrite being obtained by gradually cooling the fired body from a temperature of about 700 C. down to room temperature over a period of at least 12 hours.

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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)
  • Compounds Of Iron (AREA)
US616156A 1955-10-20 1956-10-16 Ferrite with constricted magnetic hysteresis loop Expired - Lifetime US2989472A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEST10447A DE1057254B (de) 1955-10-20 1955-10-20 Verfahren zur Herstellung von ferromagnetischen Ferritkoerpern mit eingeschnuerter Hystereseschleife
DEST10460A DE1057255B (de) 1955-10-20 1955-10-24 Verfahren zur Herstellung von ferromagnetischen Ferritkoerpern mit eingeschnuerter Hystereseschleife

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US2989472A true US2989472A (en) 1961-06-20

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US616156A Expired - Lifetime US2989472A (en) 1955-10-20 1956-10-16 Ferrite with constricted magnetic hysteresis loop
US616490A Expired - Lifetime US2929787A (en) 1955-10-20 1956-10-17 Ferrite with constricted magnetic hysteresis loop
US616817A Expired - Lifetime US2989473A (en) 1955-10-20 1956-10-18 Ferrite with constricted magnetic hysteresis loop

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US616817A Expired - Lifetime US2989473A (en) 1955-10-20 1956-10-18 Ferrite with constricted magnetic hysteresis loop

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US (3) US2989472A (de)
DE (2) DE1057254B (de)
FR (1) FR1160057A (de)
GB (1) GB849217A (de)
NL (1) NL96342C (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
US3526599A (en) * 1967-05-25 1970-09-01 Nippon Electric Co Samarium oxide containing nickel-zinc ferrite
US3533949A (en) * 1967-11-21 1970-10-13 Bell Telephone Labor Inc Heat treating method for obtaining a ferrite with a high muq product
US3609083A (en) * 1970-03-17 1971-09-28 Bell Telephone Labor Inc Heat treatment of nickel zinc cobalt ferrite

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3081264A (en) * 1958-04-09 1963-03-12 Matake Kurokawa Method of preparing a magnetic recorder powder
US3072576A (en) * 1958-05-27 1963-01-08 Aladdin Ind Inc Ferrites having rectangular hysteresis loops and method for manufacture of same
DE1182129B (de) * 1958-06-04 1964-11-19 Licentia Gmbh Verfahren zur Herstellung eines magnetischen Kernmaterials mit nahezu rechteckfoermiger Hystereseschleife
US3055832A (en) * 1960-06-10 1962-09-25 Ampex Magnetically annealed ferrite material
DE1696456B1 (de) * 1965-03-24 1970-11-12 Telefunken Patent Verfahren zur Herstellung eines unterstoechiometrischen Ferrites mit nahezu rechteckfoermiger,temperaturstabiler Hystereschleife fuer Schaltringkerne
JPS5231555B1 (de) * 1967-07-25 1977-08-16

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2452530A (en) * 1943-05-15 1948-10-26 Hartford Nat Bank & Trust Co Magnetic core
US2636860A (en) * 1944-07-06 1953-04-28 Hartford Nat Bank & Trust Co Magnetic core
US2640813A (en) * 1948-06-26 1953-06-02 Aladdin Ind Inc Reaction product of a mixed ferrite and lead titanate
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
GB751623A (en) * 1953-11-27 1956-07-04 Steatite Res Corp Improvements in or relating to ferromagnetic ceramic bodies
GB756374A (en) * 1952-11-08 1956-09-05 Licentia Gmbh A method for the manufacture of ferrite cores
FR1125577A (fr) * 1955-05-03 1956-11-02 Lignes Telegraph Telephon Matériaux ferromagnétiques à cycle d'hystérésis rectangulaire

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL63875C (de) * 1943-07-01
US2565861A (en) * 1947-09-26 1951-08-28 Rca Corp Magnetic materials
GB669571A (en) * 1948-03-27 1952-04-02 Philips Electrical Ind Ltd Improvements in or relating to magnet cores for electromagnetic devices
US2549089A (en) * 1948-12-15 1951-04-17 Rca Corp Mixed ferrite compositions, including lithium ferrite
BE534757A (de) * 1954-01-12
FR1110334A (fr) * 1954-07-13 1956-02-10 Perfectionnements aux matériaux ferromagnétiques du genre
FR1127577A (fr) * 1955-06-07 1956-12-19 Schlumberger Prospection Perfectionnements aux dispositifs à charges creuses servant à la perforation

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2452530A (en) * 1943-05-15 1948-10-26 Hartford Nat Bank & Trust Co Magnetic core
US2636860A (en) * 1944-07-06 1953-04-28 Hartford Nat Bank & Trust Co Magnetic core
US2640813A (en) * 1948-06-26 1953-06-02 Aladdin Ind Inc Reaction product of a mixed ferrite and lead titanate
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
GB756374A (en) * 1952-11-08 1956-09-05 Licentia Gmbh A method for the manufacture of ferrite cores
GB751623A (en) * 1953-11-27 1956-07-04 Steatite Res Corp Improvements in or relating to ferromagnetic ceramic bodies
FR1125577A (fr) * 1955-05-03 1956-11-02 Lignes Telegraph Telephon Matériaux ferromagnétiques à cycle d'hystérésis rectangulaire

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
US3526599A (en) * 1967-05-25 1970-09-01 Nippon Electric Co Samarium oxide containing nickel-zinc ferrite
US3533949A (en) * 1967-11-21 1970-10-13 Bell Telephone Labor Inc Heat treating method for obtaining a ferrite with a high muq product
US3609083A (en) * 1970-03-17 1971-09-28 Bell Telephone Labor Inc Heat treatment of nickel zinc cobalt ferrite

Also Published As

Publication number Publication date
GB849217A (en) 1960-09-21
US2929787A (en) 1960-03-22
NL96342C (de)
DE1057254B (de) 1959-05-14
FR1160057A (fr) 1958-07-07
DE1057255B (de) 1959-05-14
US2989473A (en) 1961-06-20

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