GB862135A - Improvements in or relating to ferromagnetic materials, more particularly for use inmicro-wave equipment - Google Patents

Improvements in or relating to ferromagnetic materials, more particularly for use inmicro-wave equipment

Info

Publication number
GB862135A
GB862135A GB33217/58A GB3321758A GB862135A GB 862135 A GB862135 A GB 862135A GB 33217/58 A GB33217/58 A GB 33217/58A GB 3321758 A GB3321758 A GB 3321758A GB 862135 A GB862135 A GB 862135A
Authority
GB
United Kingdom
Prior art keywords
hours
sintering
bafe
constituents
oct
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
GB33217/58A
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 GB862135A publication Critical patent/GB862135A/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
    • C04B35/2633—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
    • 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
    • C04B35/2683—Other ferrites containing alkaline earth metals or lead

Landscapes

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

Abstract

862,135. Magnetic compositions. PHILIPS ELECTRICAL INDUSTRIES Ltd. Oct. 17, 1958 [Oct. 21, 1957], No. 33217/58. Class 38 (2). A ferromagnetic material having a structure similar to that of the compound BaFe 12 O 19 has the formula wherein D represents at least one of the tetravalent metal Ti, Ge, Zr, Hf, Sn, wherein Me represents at least one of the bivalent metals Mn, Ni, Zn, Mg and Cu, and wherein O # a # 1, O # b # 1, O # C # 0.4, 0 < d # 2.5, 0 # e < 1, O # f # 3. The material is made by sintering, once or several times, a finely divided mixture of the constituent metal oxides, oxide yielding compounds or reaction products cf two or more of these oxides e.g. BaFe 12 O 19 . Sintering may take place between 1000‹ and 1450‹ C. and sintering agents e.g. silicates and fluorides may be added. A body exhibiting a preferred direction may be provided by sintering in a magnetic field, and this effect is enhanced when one of the constituents of the mixture itself exhibits preferred orientation. As an example the manufacture of BaTi 0.6 Co 0.6 Fe 10.8 O 19 included the steps of grinding the constituents in alcohol for 8 hours, suspended in acetone and moulded under 1 ton/square inch a magnetic field of 1000 oersted, heated up to 500‹ C. in 16 hours from 500-1210‹ C. in 5 hours and sintered for 2 hours at 1210‹ C. in O 2 .
GB33217/58A 1957-10-21 1958-10-17 Improvements in or relating to ferromagnetic materials, more particularly for use inmicro-wave equipment Expired GB862135A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL221785 1957-10-21

Publications (1)

Publication Number Publication Date
GB862135A true GB862135A (en) 1961-03-01

Family

ID=19751010

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33217/58A Expired GB862135A (en) 1957-10-21 1958-10-17 Improvements in or relating to ferromagnetic materials, more particularly for use inmicro-wave equipment

Country Status (7)

Country Link
US (1) US3046227A (en)
BE (1) BE572208A (en)
CH (1) CH407352A (en)
DE (2) DE1095900B (en)
FR (1) FR1212959A (en)
GB (1) GB862135A (en)
NL (1) NL95813C (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1323644A (en) * 1962-02-27 1963-04-12 Lignes Telegraph Telephon Ferromagnetic materials and processes for their manufacture
FR1472484A (en) * 1965-03-25 1967-05-24
DE1276534B (en) * 1965-05-10 1968-08-29 Philips Patentverwaltung Process for the production of a ferromagnetic ferrite material with a hexagonal crystal structure
GB2144114B (en) * 1983-07-28 1986-08-06 Central Glass Co Ltd Preparing ferrite of magnetoplumbite structure
US4778734A (en) * 1987-02-03 1988-10-18 Ube Industries, Ltd. Barium ferrite magnetic powder and magnetic recording medium containing the same
EP0310323B1 (en) * 1987-09-30 1993-08-18 Kabushiki Kaisha Toshiba Magnetic powder for high-density magnetic recording and magnetic recording medium using the same
DE19847272B4 (en) * 1998-10-07 2008-12-11 Siemens Ag Method for producing sintered metal cores

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640813A (en) * 1948-06-26 1953-06-02 Aladdin Ind Inc Reaction product of a mixed ferrite and lead titanate
US2656319A (en) * 1949-01-03 1953-10-20 Aladdin Ind Inc Magnetic core composition and method of producing the same
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
US2847101A (en) * 1951-11-10 1958-08-12 Basf Ag Overload releasing magnetic powder-clutch
NL93755C (en) * 1951-12-21
IT527607A (en) * 1952-02-07
BE537450A (en) * 1954-04-20
FR1110334A (en) * 1954-07-13 1956-02-10 Improvements to such ferromagnetic materials

Also Published As

Publication number Publication date
DE1095900B (en) 1960-12-29
DE1087962B (en) 1960-08-25
US3046227A (en) 1962-07-24
FR1212959A (en) 1960-03-28
CH407352A (en) 1966-02-15
NL95813C (en) 1960-11-15
BE572208A (en) 1959-04-20

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