GB880865A - Improvements in or relating to ferromagnetic ferrite materials - Google Patents

Improvements in or relating to ferromagnetic ferrite materials

Info

Publication number
GB880865A
GB880865A GB12163/58A GB1216358A GB880865A GB 880865 A GB880865 A GB 880865A GB 12163/58 A GB12163/58 A GB 12163/58A GB 1216358 A GB1216358 A GB 1216358A GB 880865 A GB880865 A GB 880865A
Authority
GB
United Kingdom
Prior art keywords
oxides
bao
zno
mol
hours
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
Application number
GB12163/58A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB880865A publication Critical patent/GB880865A/en
Expired legal-status Critical Current

Links

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
    • C04B35/2616—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 lithium
    • 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
    • C04B35/2633—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 barium, strontium or calcium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Magnetic Ceramics (AREA)
  • Compounds Of Iron (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

880,865. Magnetic compositions. PHILIPS ELECTRICAL INDUSTRIES Ltd. April 16, 1958 [April 18, 1957], No. 12163/58. Drawings to Specification. Class 38 (2). A ferromagnetic material comprises AO, 2-21 mol. per cent; MeO, 5-45 mol. per cent; Fe 2 Og, 52-83 mol. per cent, where A is at least one of bivalent metals Ba, Sr, Pb, Ca, and Me is at least one of the bivalent metals Fe, Mn, Co, Ni, Zn, Mg, Cu, or and exhibits at least two ferromagnetic crystal phases selected from the cubic crystal structure of spinel and hexagonal crystal structures of which the a-axis is 5.9 Š and the C-axis is 32.8, 43.5, 52.3, 113.1 or 84.1 Š. Proportions of constituent oxides are stated, which produce materials whose hexagonal crystal phases exhibit preferred planes and preferred directions of magnetization respectively. The former have high initial permeabilities, especially at high frequencies, and associate better with the cubic crystal phase whose properties are normally inferior, and the latter are suitable for permanent magnets and micro-wave equipment. Examples are described of materials made from a mixture of oxides, compounds which convert to oxides when heated or compounds of oxides by processes including at least some of the following steps: milling in ethyl alcohol for 1 hour, presintering in air for 15 hours at 1000 ‹ C., remilling, pressing after adding an organic binder, sintering in air at 1200‹ C. to 1330‹ C. for 2-4 hours, regrinding, pressing after further addition of a binder and resintering in oxygen at 1260‹ C. for 2 hours. The production of compositions containing in addition to Fe 2 O 3 BaO and ZnO, BaO and CoO, BaO, ZnO and CoO are described, their constituent crystal phases stated and the values of permeability and tan 8 for different frequencies tabulated, Starting materials specified are Ba carbonate, Co carbonate, ZnO, Fe 2 O 3 and BaFe 12 O 19 . In some cases values of density are given to show the improvement obtained. The proportions of AO, MeO and Fe 2 O 3 are set out on triaxial diagrams.
GB12163/58A 1957-04-18 1958-04-16 Improvements in or relating to ferromagnetic ferrite materials Expired GB880865A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL216536 1957-04-18

Publications (1)

Publication Number Publication Date
GB880865A true GB880865A (en) 1961-10-25

Family

ID=19750876

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12163/58A Expired GB880865A (en) 1957-04-18 1958-04-16 Improvements in or relating to ferromagnetic ferrite materials

Country Status (7)

Country Link
US (1) US3043776A (en)
BE (1) BE566891A (en)
CH (1) CH398823A (en)
DE (1) DE1185104B (en)
FR (1) FR1204540A (en)
GB (1) GB880865A (en)
NL (1) NL108776C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3114714A (en) * 1960-06-23 1963-12-17 Philips Corp Ferromagnetic material
JPS54150360A (en) * 1978-05-19 1979-11-26 Tdk Corp Manufacture of magnetic powder

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE756383C (en) * 1938-09-17 1952-10-20 Neosid Hansgeorg Pemetzrieder Low-loss ferromagnetic materials made from metal oxides for high frequency purposes
US2640813A (en) * 1948-06-26 1953-06-02 Aladdin Ind Inc Reaction product of a mixed ferrite and lead titanate
US2659698A (en) * 1949-01-03 1953-11-17 Aladdin Ind Inc Magnetic core and method for manufacturing same
US2736708A (en) * 1951-06-08 1956-02-28 Henry L Crowley & Company Inc Magnetic compositions
FR1071068A (en) * 1951-08-29 1954-08-24 Anorgana U S Administration Process for improving the magnetic properties of fe2o3 gamma
US2847101A (en) * 1951-11-10 1958-08-12 Basf Ag Overload releasing magnetic powder-clutch
US2723239A (en) * 1952-09-29 1955-11-08 Rca Corp Ferrospinel compositions
US2778803A (en) * 1953-02-06 1957-01-22 Aerovox Corp Magnetically hard materials
DE927259C (en) * 1953-04-26 1955-05-02 Eisen & Stahlind Ag Oxydic ferromagnetic material
FR1110819A (en) * 1953-07-20 1956-02-17 Magnetic material of ceramic nature
FR1100865A (en) * 1954-03-05 1955-09-26 Magnetic materials based on oxides for the production of magnetic recording tapes
DE1004265B (en) * 1954-04-21 1957-03-14 N S F Nuernberger Schraubenfab Non-metallic mass produced in the sintering process
US2715109A (en) * 1954-06-14 1955-08-09 Steatite Res Corp Ferromagnetic ceramic materials with hysteresis loops of rectangular shape
FR1110334A (en) * 1954-07-13 1956-02-10 Improvements to such ferromagnetic materials
DE1010441B (en) * 1955-03-11 1957-06-13 Steatit Magnesia Ag Process for improving the magnetic properties of ferrites with a rectangular hysteresis loop
GB842005A (en) * 1955-08-10 1960-07-20 Philips Electrical Ind Ltd Improvements in or relating to ferromagnetic materials
NL88281C (en) * 1955-08-10
NL88282C (en) * 1955-08-10 1958-05-16

Also Published As

Publication number Publication date
FR1204540A (en) 1960-01-26
NL108776C (en) 1964-07-15
CH398823A (en) 1966-03-15
DE1185104B (en) 1965-01-07
BE566891A (en) 1958-10-17
US3043776A (en) 1962-07-10

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