GB842005A - Improvements in or relating to ferromagnetic materials - Google Patents

Improvements in or relating to ferromagnetic materials

Info

Publication number
GB842005A
GB842005A GB24173/56A GB2417356A GB842005A GB 842005 A GB842005 A GB 842005A GB 24173/56 A GB24173/56 A GB 24173/56A GB 2417356 A GB2417356 A GB 2417356A GB 842005 A GB842005 A GB 842005A
Authority
GB
United Kingdom
Prior art keywords
starting material
oxides
sintering
aug
oxygen
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
GB24173/56A
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 GB842005A publication Critical patent/GB842005A/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
    • C04B35/2683—Other ferrites containing alkaline earth metals or lead
    • 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

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compounds Of Iron (AREA)
  • Hard Magnetic Materials (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Magnetic Ceramics (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

842,005. Magnetic compositions. PHILIPS ELECTRICAL INDUSTRIES Ltd. Aug. 7, 1956 [Aug. 10, 1955], No. 24173/56. Drawings to Specification. Class 38 (2). Ferromagnetic material suitable for use at frequencies of at least 50 Mc/sec. consists of simple and/or mixed crystals having a formula represented by Ba M<SP>II</SP> Fe 6 <SP>III</SP> On wherein up to half the Ba may be replaced by Sr, or up to a quarter by Ca or Pb, or part by two or more of these elements, wherein not more than onetenth of the Fe<SP>III</SP> may be replaced by A1 and/or Cr and wherein M<SP>II</SP> designates one or more of the bivalent metals Mn, Fe, Co, Ni, Cu, Zn and Mg. The crystals are rhombohedric having a C-axis of about 43.5Š and an A-axis of about 5.9Š. The material may be made by sintering at more than 1000‹ C., preferably between 1150‹ and 1300‹ C. a mixture of oxides or compounds such as carbonates, oxalates and acetates which convert to oxides on heating. The mixture is first ground in a ball mill with ethyl alcohol. The starting material may be presintered at 900-1200‹ C., reground and if desired, resintered several times. The starting material may include preformed reaction products of two or metal oxides, e.g. Ba Fe 12 O 19 having the structure of magneto-plumbite. The sintering processes are carried out in air or oxygen. Compounds containing Fe<SP>II</SP> are sintered at above 1200‹ C. in an atmosphere poor in oxygen. To facilitate sintering, silicates or fluorides may be added, and water or an organic binder may be used when the material is pressed to its final shape. Examples are described, specifying appropriate amounts of starting material and the manufacturing steps. A table giving composition, and specifying properties including values of real permeability Á<SP>1</SP> is given. For some compositions curves are given showing variation of Á<SP>1</SP> and with frequency (Figs. 1-5, not shown). Small quantities of impurities, such as ferrites may be found in the materials. By bringing the material to the state of magnetic remanence before use, the losses may be reduced.
GB24173/56A 1955-08-10 1956-08-07 Improvements in or relating to ferromagnetic materials Expired GB842005A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL199610 1955-08-10

Publications (1)

Publication Number Publication Date
GB842005A true GB842005A (en) 1960-07-20

Family

ID=19750722

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24173/56A Expired GB842005A (en) 1955-08-10 1956-08-07 Improvements in or relating to ferromagnetic materials

Country Status (6)

Country Link
US (1) US2946753A (en)
CH (1) CH377268A (en)
ES (1) ES230262A1 (en)
FR (1) FR1169565A (en)
GB (1) GB842005A (en)
NL (1) NL88300C (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL108776C (en) * 1957-04-18 1964-07-15
NL99528C (en) * 1957-06-22 1961-11-15
BE558662A (en) * 1957-06-24
US3093453A (en) * 1959-04-15 1963-06-11 Weizmann Inst Of Science Ferrite material containing fluorine
US3191132A (en) * 1961-12-04 1965-06-22 Mayer Ferdy Electric cable utilizing lossy material to absorb high frequency waves
US3319191A (en) * 1965-07-08 1967-05-09 Jr Samuel Dixon Microwave power limiter utilizing a planar ferrite sphere
US4243697A (en) * 1979-03-14 1981-01-06 The United States Of America As Represented By The Secretary Of The Air Force Self biased ferrite resonators
US20040119552A1 (en) * 2002-12-20 2004-06-24 Com Dev Ltd. Electromagnetic termination with a ferrite absorber

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659698A (en) * 1949-01-03 1953-11-17 Aladdin Ind Inc Magnetic core and method for manufacturing same
LU30876A1 (en) * 1950-09-19
US2736708A (en) * 1951-06-08 1956-02-28 Henry L Crowley & Company Inc Magnetic compositions
BE516395A (en) * 1951-12-21
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
FR1100865A (en) * 1954-03-05 1955-09-26 Magnetic materials based on oxides for the production of magnetic recording tapes
FR1114010A (en) * 1954-11-09 1956-04-06 Audax Sintered mixed oxide permanent magnets

Also Published As

Publication number Publication date
US2946753A (en) 1960-07-26
ES230262A1 (en) 1957-03-01
NL88300C (en) 1958-05-16
CH377268A (en) 1964-04-30
FR1169565A (en) 1958-12-31

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