US2685568A - Soft ferromagnetic mixed ferrite material - Google Patents

Soft ferromagnetic mixed ferrite material Download PDF

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Publication number
US2685568A
US2685568A US161188A US16118850A US2685568A US 2685568 A US2685568 A US 2685568A US 161188 A US161188 A US 161188A US 16118850 A US16118850 A US 16118850A US 2685568 A US2685568 A US 2685568A
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Prior art keywords
per cent
ferrite
mol per
oxide
cuo
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US161188A
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English (en)
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Volney C Wilson
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General Electric Co
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General Electric Co
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Priority to NL81425D priority Critical patent/NL81425C/xx
Priority to BE503124D priority patent/BE503124A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US161188A priority patent/US2685568A/en
Priority to DEI4077A priority patent/DE970458C/de
Priority to GB9649/51A priority patent/GB679349A/en
Priority to FR1049318D priority patent/FR1049318A/fr
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Publication of US2685568A publication Critical patent/US2685568A/en
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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

Definitions

  • the present invention relates to a soft ferromagnetic material consisting of mixed ferrites. It is particularly concerned with a mixed spineltype crystal ferrite characterized particularly by a low dielectric constant and a higt initial permeability combined with a high electrical resistivity.
  • Ferromagnetic oxides have been known for some time. All of them comprise one or more binary compounds of the formula MF204 (or MOFezOs) wherein M represents a bivalent metal.
  • the fired or sintered ferrites or mixtures thereof are ordinarily in the form of mixed crystalline compounds, the magnetic properties of which depend to a large extent upon the particular metal or metals M employed in their preparation.
  • the cobalt ferrites and cobalt nickel ferrites are hard (permanent) magnetic materials while mixed ferrites containing substantial amounts of examples of soft magnetic materials, 1. e., materials having a low coercive force.
  • the present invention is based on the discovery that marked improvements in certain of the properties of the nickel zinc ferrites can be obtained by including small amounts of copper oxide as a fourth oxide constituent and maintaining the iron oxide content of the ferrite ma terial at a mol percentage slightly below 50 per cent.
  • nickel zinc copper ferrites containing from 1 to 8 mol per cent, preferably from 2 to 6 mol per cent, copper oxide, from 4''! to 49 mol per cent ferric oxide, 28 to 38 per cent, preferably 28-32 percent, zinc oxide, balance nickel oxide are characterized by markedly improved permeabilities and higher A. C. and D. C. resistivities than comparable ferrites containing only nickel and zinc oxides in addition to the iron oxide.
  • the ferrites of the zinc ferrite are 2 present invention are further noted for their high Q values and better over-all magnetic prop erties particularly at high frequencies.
  • these improved results are obtained without recourse to special firing conditions such as firing in an atmosphere of oxygen as recommended in the Snoek patent.
  • Fig. 1 shows the manner in which the resistivityvaries with change in the copper oxide content
  • Fig. 2 is a plotof the normal magnetization' curves of certain indicated compositions
  • Fig. 3 shows the effect of varying the firing temperature of a copper-free ferrite containing 59 mol per cent F6203, 20 mol per cent NiO and 30 mol per cent ZnO
  • Figs. 4, 5 and 6 are plots of induction as a function of composition or (3110 content for 0.2, 1 and 60 oersteds respectively.
  • Fig. 1 shows the way the resistivity varies with percentage of CuO. From these results it will be seen that when a maximum resistivity substantially above 2 l0 ohm/cm. is desired, the ferrite should contain from 2 to 6, preferably 3 to 4 mol per cent CuO.
  • the 2 per cent CuO- of this series compares with the formula of Fig. 3 fired at about 1300 C.
  • the induction at all values of H is improved by either the addition of 2 per cent CuO or by increasing the firing temperature to 1300 C.
  • Increasing the CuO to 8 per cent or increasing the firing temperature to 1390" C. increases the induction at H values below 1 oersted but decreases the induction above 1 oersted.
  • one advantage of the addition of CuO to the NiZn ferrites is that for a given firing temperature, improved induction values can be obtained or conversely a desired induction value can be obtained at a lower firing temperature and hence at a lower processing cost. It would appear that within limits, the CuO additions effectively improve the formation of the desired spinel structure,
  • Fig. 4 there is plotted induction values of the series of ferrites as a function of CuO content at 0.2 oersted.
  • Fig. is a similar plot at 1 oersted and Fig. 6 at 60 oersteds. From these three figures it is apparent that in all cases the induction is improved by the addition of from 1 to 8 per cent CuO. The preferred amount to be added will depend upon the use to which the material is to be applied. If a field strength of 1 oersted is contemplated, then from 4 to 6 per cent CuO will give the highest induction and permeability. If the material is to be driven to higher H values, then about 2 per cent CuO will give the best results. If a high resistivity is required, then as shown by the results plotted in Fig. 1, from 3 to 4 per cent CuO should be used.
  • the dielectric constants of all of these materials were about the same; ranging from 15.5 to 24.1 in the frequency range from 0.6 to 5 me.
  • the products of the present invention may be used for various core applications. Some of them, particularly those containing about 4 mol per cent CuO, have been found to be particularly useful in television sweep transformers.
  • a further advantage of the materials of the present invention is that these improved properties are obtained at relatively low firing temperatures in air.
  • a special atmosphere such as an oxygen atmosphere is not required although it can be used if so desired.
  • a firing or sintering temperature of 1200 C. is preferred, it is, of course, understood that the invention is not limited thereto. Higher or lower sintering temperatures can be employed with resultant variations in the properties of the sintered products in much the same way as was noted in connection with the straight nickel zinc ferrites of Fig. 3.
  • the coppermodified materials give a higher permeability and combined with a higher resistivity, plus better performance characteristics particularly at frequencies of one megacycle and above.
  • a soft magnetic mixed crystal ferrite material consisting essentially of nickel ferrite, zinc ferrite and copper ferrite and having a metal oxide content of 47 to 49 mol per cent iron oxide, 1 to 8 mol per cent copper oxide, 28 to 38 mol per cent zinc oxide, balance nickel oxide, said mixed ferrite having a D. C. resistivity greater than 141) ohm-cm, and a magnetic induction greater than 400 gauss at a field strength of 1 oersted.
  • a soft magnetic mixed crystal ferrite material consisting essentially of nickel ferrite, zinc ferrite and copper ferrite and having a metal oxide content of 4'7 to 49 mol per cent iron oxide, 2 to 6 mol per cent copper oxide, 28 to 32 mol per cent zinc oxide, balance nickel oxide, said mixed ferrite having a D. C. resistivity of the order of 2 10 ohm-cm, and a magnetic induction greater than 1000 gauss at a field strength of 1 oersted.
  • a soft magnetic mixed crystal ferrite material consisting essentially of nickel ferrite, zinc ferrite and copper ferrite and having a metal oxide content of 47 to 49 mol per cent iron oxide, about 4 mol per cent copper oxide, 28 to 32 mol per cent zinc oxide, balance nickel oxide, said mixed ferrite having a D. C. resistivity of the order of at least 1x10 ohm-cm, and a magnetic induction greater than 1200 gauss at a field strength of 1 oersted.
  • a magnetic mixed crystal ferrite material consisting essentially of nickel ferrite, zinc ferrite and copper ferrite and having a metal oxide content of about 4 mol per cent copper oxide, about 28 mol per cent zinc oxide, about 18 mol per cent nickel oxide and slightly less than 50 mol per cent iron oxide.

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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)
US161188A 1950-05-10 1950-05-10 Soft ferromagnetic mixed ferrite material Expired - Lifetime US2685568A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL81425D NL81425C (es) 1950-05-10
BE503124D BE503124A (es) 1950-05-10
US161188A US2685568A (en) 1950-05-10 1950-05-10 Soft ferromagnetic mixed ferrite material
DEI4077A DE970458C (de) 1950-05-10 1951-04-22 Weichmagnetisches Kernmaterial aus Nickel-Zink-Ferrit
GB9649/51A GB679349A (en) 1950-05-10 1951-04-25 Improvements in and relating to magnetically soft mixed ferrite materials
FR1049318D FR1049318A (fr) 1950-05-10 1951-05-07 Ferrite mixte ferromagnétique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US161188A US2685568A (en) 1950-05-10 1950-05-10 Soft ferromagnetic mixed ferrite material

Publications (1)

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US2685568A true US2685568A (en) 1954-08-03

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US161188A Expired - Lifetime US2685568A (en) 1950-05-10 1950-05-10 Soft ferromagnetic mixed ferrite material

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US (1) US2685568A (es)
BE (1) BE503124A (es)
DE (1) DE970458C (es)
FR (1) FR1049318A (es)
GB (1) GB679349A (es)
NL (1) NL81425C (es)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773039A (en) * 1952-11-24 1956-12-04 Steatite Res Corp Magnetically strong ferromagnetic magnesium-zinc type of ferrite
US2967794A (en) * 1956-09-12 1961-01-10 Handy & Harman Fine particle magnets
US2972176A (en) * 1956-02-15 1961-02-21 Clevite Corp Prestressed dielectric ceramic bodies
US2994045A (en) * 1955-04-11 1961-07-25 Bell Telephone Labor Inc Electrical transmission devices utilizing gyromagnetic ferrites
US3003966A (en) * 1957-09-09 1961-10-10 Bell Telephone Labor Inc Polycrystalline garnet materials
US3031405A (en) * 1956-12-14 1962-04-24 Lignes Telegraph Telephon Ferromagnetic materials having a rectangular hysteresis cycle
US3039966A (en) * 1959-06-17 1962-06-19 Philips Corp Square loop ferromagnetic material
US3100194A (en) * 1958-01-15 1963-08-06 Philips Corp Ferromagnetic material and method of making the same
US4042518A (en) * 1973-09-05 1977-08-16 Xerox Corporation Stoichiometric ferrite carriers
US5435929A (en) * 1992-02-28 1995-07-25 Kureha Kagaku Kogyo Kabushiki Kaisha Permeable magnetic composition and magnetic component
US5855810A (en) * 1996-11-30 1999-01-05 Samsung Electro-Mechanics Co., Ltd. Soft ferrite material for use in making inductors, and method for manufacturing inductors using the material

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1182129B (de) * 1958-06-04 1964-11-19 Licentia Gmbh Verfahren zur Herstellung eines magnetischen Kernmaterials mit nahezu rechteckfoermiger Hystereseschleife

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1976230A (en) * 1930-12-25 1934-10-09 Mitsubishi Electric Corp Permanent magnet and method of manufacturing same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE447683A (es) * 1941-10-24
US2452530A (en) * 1943-05-15 1948-10-26 Hartford Nat Bank & Trust Co Magnetic core
CH260717A (de) * 1943-05-31 1949-03-31 Philips Nv Verfahren zur Herstellung eines magnetischen Kernes, und nach diesem Verfahren hergestellter magnetischer Kern.
US2656319A (en) * 1949-01-03 1953-10-20 Aladdin Ind Inc Magnetic core composition and method of producing the same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1976230A (en) * 1930-12-25 1934-10-09 Mitsubishi Electric Corp Permanent magnet and method of manufacturing same

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773039A (en) * 1952-11-24 1956-12-04 Steatite Res Corp Magnetically strong ferromagnetic magnesium-zinc type of ferrite
US2994045A (en) * 1955-04-11 1961-07-25 Bell Telephone Labor Inc Electrical transmission devices utilizing gyromagnetic ferrites
US2972176A (en) * 1956-02-15 1961-02-21 Clevite Corp Prestressed dielectric ceramic bodies
US2967794A (en) * 1956-09-12 1961-01-10 Handy & Harman Fine particle magnets
US3031405A (en) * 1956-12-14 1962-04-24 Lignes Telegraph Telephon Ferromagnetic materials having a rectangular hysteresis cycle
US3003966A (en) * 1957-09-09 1961-10-10 Bell Telephone Labor Inc Polycrystalline garnet materials
US3100194A (en) * 1958-01-15 1963-08-06 Philips Corp Ferromagnetic material and method of making the same
US3039966A (en) * 1959-06-17 1962-06-19 Philips Corp Square loop ferromagnetic material
US4042518A (en) * 1973-09-05 1977-08-16 Xerox Corporation Stoichiometric ferrite carriers
US5435929A (en) * 1992-02-28 1995-07-25 Kureha Kagaku Kogyo Kabushiki Kaisha Permeable magnetic composition and magnetic component
US5855810A (en) * 1996-11-30 1999-01-05 Samsung Electro-Mechanics Co., Ltd. Soft ferrite material for use in making inductors, and method for manufacturing inductors using the material

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Publication number Publication date
DE970458C (de) 1958-09-18
FR1049318A (fr) 1953-12-29
NL81425C (es)
BE503124A (es)
GB679349A (en) 1952-09-17

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