US2565111A - Ceramic magnetic material with a small temperature coefficient - Google Patents
Ceramic magnetic material with a small temperature coefficient Download PDFInfo
- Publication number
- US2565111A US2565111A US95582A US9558249A US2565111A US 2565111 A US2565111 A US 2565111A US 95582 A US95582 A US 95582A US 9558249 A US9558249 A US 9558249A US 2565111 A US2565111 A US 2565111A
- Authority
- US
- United States
- Prior art keywords
- zno
- mgo
- mno
- temperature
- phase
- 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 - Lifetime
Links
- 239000000919 ceramic Substances 0.000 title description 6
- 239000000696 magnetic material Substances 0.000 title description 3
- 230000035699 permeability Effects 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 14
- 230000005294 ferromagnetic effect Effects 0.000 claims description 12
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 claims description 8
- 229910044991 metal oxide Inorganic materials 0.000 claims description 7
- 150000004706 metal oxides Chemical class 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 229910010293 ceramic material Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 description 13
- 230000005291 magnetic effect Effects 0.000 description 11
- 239000000047 product Substances 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000010304 firing Methods 0.000 description 5
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910052814 silicon oxide Inorganic materials 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 239000003989 dielectric material Substances 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 241000656145 Thyrsites atun Species 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 229910000708 MFe2O4 Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- VSYMNDBTCKIDLT-UHFFFAOYSA-N [2-(carbamoyloxymethyl)-2-ethylbutyl] carbamate Chemical compound NC(=O)OCC(CC)(CC)COC(N)=O VSYMNDBTCKIDLT-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 235000012243 magnesium silicates Nutrition 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical class [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- 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
Definitions
- This invention relates to a ceramic magnetic material, especially for transformer and inductance coils, with ;a small temperature coefficient and to the process of making the material.
- ferrite compounds have been developed and described in the technical literature, i. e. ferromagnetic oxides of the general formula MFe2O4, where M represents a bivalent metal as, for instance, manganese, copper of magnesium.
- M represents a bivalent metal as, for instance, manganese, copper of magnesium.
- ferromagnetic oxides of the general formula MFe2O4, where M represents a bivalent metal as, for instance, manganese, copper of magnesium.
- M represents a bivalent metal as, for instance, manganese, copper of magnesium.
- An object of the invention is to provide a ferromagnetic compound having better than average magnetic properties such as permeability, initial permeability, Curie point and magnetic losses and at'the same time having a very small temperature coefficient of n. 1
- Another object of the invention is to provide a ferromagnetic compound having better than average magnetic properties such as permeability,
- Another object of the invention is to provide a shaped ferromagnetic body having a Curie point of 250 C. or higher, small magnetic losses and at the same time having a very small temperature coefficient and said body consisting of a crystalline cubic phase and a glassy intercrystalline phase.
- Another object of the invention is to provide a process of making such products.
- Such ferrite compounds have an initial permeability of between about and 150, small magnetic losses over the frequency range of cs. to about 30 mos, a Curie point of 250 C. or higher, a temperature coefficient measured on toroidal cores of not more than 10% for C. temperature increase. This figure of 10% corresponds to a much smaller figure of 1 to 2% only, if the material is used as a cylindrical core in an inductance coil.
- Coils equipped with cores of such materials show no higher temperature coeii'icient than an air coil.
- the fired product would consist of a polycrystalline aggregate presenting only one phase. Materials of this kind are somewhat unfavorable on two accounts. It is known that crystalline aggregates without any intermediate glassy phase sometimes have a tendency to disintegrate. This effect, for instance, is well known from the magnesium silicates which, if formed of merely MgSiOs crystals lacking a protective glassy phase, can disintegrate within a few days after firing into a fine powder. Even if the disintegration does not progress to completion a noticeable change of the physical properties may take place.
- silica In the second place, in the special case of magnetic iron oxides an intermediate glassy phase created by the addition of silica improves not only the insulating properties, diminishing some losses, but eifects also a considerable decrease of the temperature-coefficient of the magnetic permeability. It goes without saying that the silica has to be added in a very finely divided state to be sufiiciently reactive. To facilitate and to support the formation of the glassy phase one or more oxides of univalent elements such as lithium, sodium or potassium may be added in amounts up to about 0.05 mol.
- the components which appear in the final product are not necessarily added to the composition in that form.
- manganese is usually added in the form of the dioxide, but during the firing process it is changed to the monoxide.
- lithium, sodium and potassium oxides are desired in the final product the carbonates of these metals are usually added to the original composition.
- the various components of the powder from which the products are molded are ground and mixed together by milling, etc.
- the powders are preferably ground ver fine, to less than 0.010 m. m., for example.
- the mixed powders are moistened with just enough aqueous liquid to make the unfired product adhere when molded.
- the aqueous liquid may be ordinary water or it may be water having wax or other binding material emulsified therein.
- the moistened powder may be molded in a steel die or other ceramic molding machine such as an extrusion machine. The molded product must be fired at a temperature high enough to cause a phase separation between the cubic crystalline ferrite materials and the glassy
- Example 1 A mix of the following ingredients in the proportions indicated is compounded:
- Example 3 A mix is made up of the following ingredients in the proportions indicated:
- a ferromagnetic ceramic material consisting mainly of iron oxide compounds of the magnetitetype, suitable for the use at frequencies between 60 es. and about 30 mos, composed of the four bivalent metal oxides, MgO, MnO, ZnO, and NiO, silica and F6203, in the mol ratio of .05-.35 MgO .10-.25 MnO .15-.30 ZnO .15-.40 N10 .10-.20 S102 about 1 F6203 the total mol proportion of the bivalent metal oxides to F8203 being approximately 1:1 said material having'a Curie point of at least 250 C. an initial permeability between 50 and and a temperature coefficient of a (measured on a toroid) of less than 10% between room temperature and 120 C.
- a shaped ferromagnetic ceramic article consisting mainly of iron oxide compounds of the magnetite type, composed of MgO, MnO, ZnO, NiO, F8203 the total mol proportion of the bivalent metal oxides being approximately equal to the mol proportion of F9203 and an amount of about .2 mol of silica (per mol proportion of F8203) said material forming a heterogeneous body of a crystalline cubic phase and a glassy intercrystalline phase, the material of said article having a Curie point of at least 250 C'. an initial permeability of about 50 to 150 and a temperature coefiicient of a (measured on a toroid) of less than 10% between room. temperature and 3.
- a ferromagnetic ceramic material consisting essentially of iron oxide compounds of the magnetite type, composed of about 1 mol proportion of MgO, MnO, ZnO and N10, 1 mol total proportion of F6203 and an amount of about .1.2 mol of silica and about 0.05 mol of an univalent metal oxide, per mol proportion of F8203, said material consisting of a heterogeneous body of a crystalline cubic phase and a glassy intercrystalline phase and 9, having a Curie point of at least 250 0., an initial permeability of about 50 to 150 and a temperature coefiicient of ,1 (measured on a toroid) of less than between room temperature and 100 C.
- a process of makin a shaped ferromagnetic body consisting essentially of iron oxide compounds of the magnetite type, which body consists of a heterogeneous body having a crystalline cubic phase and a glassy intercrystalline phase comprising the steps of mixing together F6203 and compounds of Mg, Mn, Zn, and Ni adapted to appear in the final prdouct after firing as MgO, MnO, ZnO, NiO the mol proportion of the Fezos being approximately equal to the total mol proportion of the first four oxides, adding about 0.10 to 0.20 mol proportion of the finely divided SiOz based on the mols of Fe2o3 present,
- a process of making a shaped ferromagnetic body consisting essentially of iron oxide compounds of the magnetite type, which body consists of a heterogeneous body having a crystalline cubic phase and a glassy intercrystalline phase comprising the steps of mixing together powdered MgO, MnOz, ZnO, N10, and F8203 the mol proportion of the F6203 being approximately equal to the total mol proportion of the first four oxides, adding about 0.10 to 0.20 mol proportion of finely divided 8102 based on the mols of F6203 present, and less than 0.05 mol proportion of L (on the same basis) moistening and plasticizing the mix, with a wax emulsion, molding the mix to the desired shape and firing the molded product at a temperature to produce a two phase system consisting of a cubic crystalline phase and a glassy intercrystalline phase.
Landscapes
- 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)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US95582A US2565111A (en) | 1949-05-26 | 1949-05-26 | Ceramic magnetic material with a small temperature coefficient |
GB11666/50A GB668699A (en) | 1949-05-26 | 1950-05-10 | Ceramic magnetic material with a small temperature coefficient |
FR1018562D FR1018562A (fr) | 1949-05-26 | 1950-05-24 | Matière céramique magnétique |
CH289183D CH289183A (de) | 1949-05-26 | 1950-05-25 | Keramischer, ferromagnetischer Körper und Verfahren zu dessen Herstellung. |
NL76660D NL76660C (xx) | 1949-05-26 | 1950-05-26 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US95582A US2565111A (en) | 1949-05-26 | 1949-05-26 | Ceramic magnetic material with a small temperature coefficient |
Publications (1)
Publication Number | Publication Date |
---|---|
US2565111A true US2565111A (en) | 1951-08-21 |
Family
ID=22252661
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US95582A Expired - Lifetime US2565111A (en) | 1949-05-26 | 1949-05-26 | Ceramic magnetic material with a small temperature coefficient |
Country Status (5)
Country | Link |
---|---|
US (1) | US2565111A (xx) |
CH (1) | CH289183A (xx) |
FR (1) | FR1018562A (xx) |
GB (1) | GB668699A (xx) |
NL (1) | NL76660C (xx) |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2670331A (en) * | 1951-09-28 | 1954-02-23 | Steatite Res Corp | Magnesium-zinc ceramic ferrite containing copper |
US2734034A (en) * | 1956-02-07 | Magnetic compositions | ||
US2764552A (en) * | 1952-02-22 | 1956-09-25 | Int Standard Electric Corp | Ferromagnetic materials |
US2830162A (en) * | 1954-06-22 | 1958-04-08 | Raytheon Mfg Co | Heating method and apparatus |
US2846655A (en) * | 1955-08-19 | 1958-08-05 | Hughes Aircraft Co | Impregnated ferrite |
DE1064412B (de) * | 1952-02-28 | 1959-08-27 | Centre Nat Rech Scient | Verfahren zur Herstellung eines Eisen-Mangan-Magnesium-Zink-Ferrits |
US2980617A (en) * | 1956-03-13 | 1961-04-18 | Indiana General Corp | Ferrite compositions and method of making same |
US2981903A (en) * | 1954-02-26 | 1961-04-25 | Bell Telephone Labor Inc | Gyromagnetic wave transmission devices |
US2981690A (en) * | 1957-06-18 | 1961-04-25 | Steatite Res Corp | Ferrites with square hysteresis loops |
US2992990A (en) * | 1956-01-05 | 1961-07-18 | Richard G Parker | Soft magnetic material |
US3007875A (en) * | 1959-06-23 | 1961-11-07 | Steatite Res Corp | Square loop ferrites |
US3023165A (en) * | 1956-08-17 | 1962-02-27 | Bell Telephone Labor Inc | Magnesium ferrite containing aluminum and method of making same |
US3033792A (en) * | 1957-05-28 | 1962-05-08 | Kikuchi Yoshimitsu | Method of manufacturing ferrite magnetostriction vibrators |
US3039964A (en) * | 1957-05-06 | 1962-06-19 | Du Pont | Preparation of ilmenite-type compounds |
US3039965A (en) * | 1957-05-06 | 1962-06-19 | Du Pont | Ilmenite-type complex manganese oxides and preparation thereof |
US3061546A (en) * | 1960-03-02 | 1962-10-30 | Rca Corp | Magnetic cores |
US3066233A (en) * | 1957-07-25 | 1962-11-27 | Clevite Corp | Ferrite transducers |
DE976406C (de) * | 1951-10-30 | 1963-08-29 | Steatite Res Corp | Verwendung eines gebrannten Produktes als ferromagnetische Masse |
US5346638A (en) * | 1992-09-14 | 1994-09-13 | Murata Manufacturing Co., Inc. | Oxide magnetic material |
US5523549A (en) * | 1994-05-25 | 1996-06-04 | Ceramic Powders, Inc. | Ferrite compositions for use in a microwave oven |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL114043C (xx) * | 1955-06-30 | |||
DE1176544B (de) * | 1957-09-18 | 1964-08-20 | Hermsdorf Keramik Veb | Verfahren zur Herstellung von hartmagnetischen Oxydwerkstoffen |
US3096288A (en) * | 1957-12-23 | 1963-07-02 | Union Carbide Corp | Ferri-magnetic spinel bodies |
US2934667A (en) * | 1958-06-17 | 1960-04-26 | Gen Electric | Controlled resistivity glaze for ignitor plugs |
NL273242A (xx) * | 1962-01-05 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1881711A (en) * | 1931-08-14 | 1932-10-11 | Bell Telephone Labor Inc | Magnetic structure |
US2382136A (en) * | 1943-03-13 | 1945-08-14 | Henry L Crowley & Company Inc | Ceramic bodies and method of producing same |
US2452531A (en) * | 1943-05-31 | 1948-10-26 | Hartford Nat Bank & Trust Co | Process of manufacturing a magnetic material and magnetic core |
-
1949
- 1949-05-26 US US95582A patent/US2565111A/en not_active Expired - Lifetime
-
1950
- 1950-05-10 GB GB11666/50A patent/GB668699A/en not_active Expired
- 1950-05-24 FR FR1018562D patent/FR1018562A/fr not_active Expired
- 1950-05-25 CH CH289183D patent/CH289183A/de unknown
- 1950-05-26 NL NL76660D patent/NL76660C/xx active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1881711A (en) * | 1931-08-14 | 1932-10-11 | Bell Telephone Labor Inc | Magnetic structure |
US2382136A (en) * | 1943-03-13 | 1945-08-14 | Henry L Crowley & Company Inc | Ceramic bodies and method of producing same |
US2452531A (en) * | 1943-05-31 | 1948-10-26 | Hartford Nat Bank & Trust Co | Process of manufacturing a magnetic material and magnetic core |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2734034A (en) * | 1956-02-07 | Magnetic compositions | ||
US2670331A (en) * | 1951-09-28 | 1954-02-23 | Steatite Res Corp | Magnesium-zinc ceramic ferrite containing copper |
DE976406C (de) * | 1951-10-30 | 1963-08-29 | Steatite Res Corp | Verwendung eines gebrannten Produktes als ferromagnetische Masse |
US2764552A (en) * | 1952-02-22 | 1956-09-25 | Int Standard Electric Corp | Ferromagnetic materials |
DE1064412B (de) * | 1952-02-28 | 1959-08-27 | Centre Nat Rech Scient | Verfahren zur Herstellung eines Eisen-Mangan-Magnesium-Zink-Ferrits |
US2981903A (en) * | 1954-02-26 | 1961-04-25 | Bell Telephone Labor Inc | Gyromagnetic wave transmission devices |
US2830162A (en) * | 1954-06-22 | 1958-04-08 | Raytheon Mfg Co | Heating method and apparatus |
US2846655A (en) * | 1955-08-19 | 1958-08-05 | Hughes Aircraft Co | Impregnated ferrite |
US2992990A (en) * | 1956-01-05 | 1961-07-18 | Richard G Parker | Soft magnetic material |
US2980617A (en) * | 1956-03-13 | 1961-04-18 | Indiana General Corp | Ferrite compositions and method of making same |
US3023165A (en) * | 1956-08-17 | 1962-02-27 | Bell Telephone Labor Inc | Magnesium ferrite containing aluminum and method of making same |
US3039964A (en) * | 1957-05-06 | 1962-06-19 | Du Pont | Preparation of ilmenite-type compounds |
US3039965A (en) * | 1957-05-06 | 1962-06-19 | Du Pont | Ilmenite-type complex manganese oxides and preparation thereof |
US3033792A (en) * | 1957-05-28 | 1962-05-08 | Kikuchi Yoshimitsu | Method of manufacturing ferrite magnetostriction vibrators |
US2981690A (en) * | 1957-06-18 | 1961-04-25 | Steatite Res Corp | Ferrites with square hysteresis loops |
US3066233A (en) * | 1957-07-25 | 1962-11-27 | Clevite Corp | Ferrite transducers |
US3007875A (en) * | 1959-06-23 | 1961-11-07 | Steatite Res Corp | Square loop ferrites |
US3061546A (en) * | 1960-03-02 | 1962-10-30 | Rca Corp | Magnetic cores |
US5346638A (en) * | 1992-09-14 | 1994-09-13 | Murata Manufacturing Co., Inc. | Oxide magnetic material |
US5523549A (en) * | 1994-05-25 | 1996-06-04 | Ceramic Powders, Inc. | Ferrite compositions for use in a microwave oven |
US5665819A (en) * | 1994-05-25 | 1997-09-09 | Ceramic Powders, Inc. | Ferrite compositions for use in a microwave oven |
Also Published As
Publication number | Publication date |
---|---|
NL76660C (xx) | 1954-12-15 |
GB668699A (en) | 1952-03-19 |
FR1018562A (fr) | 1953-01-09 |
CH289183A (de) | 1953-02-28 |
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