GB828756A - Non metallic ferromagnetic materials having a rectangular hysteresis cycle - Google Patents

Non metallic ferromagnetic materials having a rectangular hysteresis cycle

Info

Publication number
GB828756A
GB828756A GB38845/57A GB3884557A GB828756A GB 828756 A GB828756 A GB 828756A GB 38845/57 A GB38845/57 A GB 38845/57A GB 3884557 A GB3884557 A GB 3884557A GB 828756 A GB828756 A GB 828756A
Authority
GB
United Kingdom
Prior art keywords
range
tabulated
cores
resin
dec
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
GB38845/57A
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.)
Lignes Telegraphiques et Telephoniques LTT SA
Original Assignee
Lignes Telegraphiques et Telephoniques LTT SA
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 Lignes Telegraphiques et Telephoniques LTT SA filed Critical Lignes Telegraphiques et Telephoniques LTT SA
Publication of GB828756A publication Critical patent/GB828756A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
    • H01F1/342—Oxides
    • H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
    • 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

Abstract

828,756. Magnetic compositions. LIGNES TELEGRAPHIQUES ET TELEPHONIQUES. Dec. 13, 1957 [Dec. 14, 1956; Sept. 18, 1957], No. 38845/57. Drawings to Specification. Class 38 (2). A ferromagnetic ferrite with a rectangular hysteresis loop is made by compressing and heating a mixture having the composition xFe 2 O 3 , yT 2 O 3 , uNiO, vCuO, sZnO, tCdO, where T is Al or Cr, x+y is in the range 47-50, y is in the range 0-2, v is in the range 3-15, u+v is in the range 25-53 and s+t is in the range 0-25, the heat treatment producing mechanical stresses in the material. In manufacture, a mixture of oxides is ground in a ball mill for 12-48 hours in distilled water, compressed at 0.5-15 tons/sq.cm., sintered at 900‹ to 1300‹ C. in oxygen and cooled for 15 hours. The magnetic properties of a large number of different compositions within the above formulµ are tabulated and graphically illustrated, the effects of varying the proportions of different ingredients being shown. To improve the rectangularity of the hysteresis loop a core of the material may be subjected to external mechanical stress. This may be applied by hydraulic pressure, by a clamped rubber band, by a cured enamel coating or by polymerizing a potting resin. The latter may be a non-saturated polyester resin with monostyrene to which is added benzoyl peroxide as catalyst and cobalt naphthenate or oxtoate in white spirit or styrolene as accelerator. A ring-shaped core may be completely coated or surrounded by a band of the resin, or a perforated plate or a set of cores may be coated. The properties of stressed and unstressed cores of 48Fe 2 O 3 , 47NiO, 5CuO are tabulated.
GB38845/57A 1956-12-14 1957-12-13 Non metallic ferromagnetic materials having a rectangular hysteresis cycle Expired GB828756A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR727692 1956-12-14
FR747548 1957-09-18

Publications (1)

Publication Number Publication Date
GB828756A true GB828756A (en) 1960-02-24

Family

ID=26183073

Family Applications (1)

Application Number Title Priority Date Filing Date
GB38845/57A Expired GB828756A (en) 1956-12-14 1957-12-13 Non metallic ferromagnetic materials having a rectangular hysteresis cycle

Country Status (7)

Country Link
US (1) US3031405A (en)
BE (1) BE562891A (en)
CH (1) CH377539A (en)
DE (1) DE1087507B (en)
FR (2) FR1163304A (en)
GB (1) GB828756A (en)
NL (1) NL112299C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3150095A (en) * 1961-11-24 1964-09-22 Ibm Ferrite ceramic compositions and method of preparation
DE1646997B1 (en) * 1965-08-10 1972-06-29 Siemens Ag PROCESS FOR MANUFACTURING A FERROMAGNETIC SWITCH CORE FROM FERRITE WITH A RECTANGULAR HYSTERESIS LOOP
US7385341B2 (en) * 2004-03-05 2008-06-10 Matsushita Toshiba Picture Display Co., Ltd. Cathode-ray tube apparatus with magnetic spacers between magnetic rings
US7126292B2 (en) * 2004-03-16 2006-10-24 Matsushita Toshiba Picture Display Co., Ltd. Cathode-ray tube apparatus

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL63875C (en) * 1943-07-01
US2532876A (en) * 1946-12-19 1950-12-05 Asche Robert Electromagnetic artificial muscle
US2565861A (en) * 1947-09-26 1951-08-28 Rca Corp Magnetic materials
NL75788C (en) * 1947-12-31
US2601212A (en) * 1948-11-09 1952-06-17 Gen Aniline & Film Corp Heat resistant magnetic cores and method of making
NL81425C (en) * 1950-05-10
FR1058390A (en) * 1951-07-24 1954-03-16 Steatite Res Corp Ferromagnetic core with variable permeability shells
CA525699A (en) * 1952-02-07 1956-05-29 Albers-Schoenberg Ernst Ferromagnetic ceramic materials with hysteresis loops of rectangular shape
US2748099A (en) * 1952-09-04 1956-05-29 Du Pont Polyamide compositions containing a high percentage of metal filler
US2723239A (en) * 1952-09-29 1955-11-08 Rca Corp Ferrospinel compositions
NL84264C (en) * 1952-10-02
FR65914E (en) * 1952-11-08 1956-03-27
GB752659A (en) * 1953-11-06 1956-07-11 Acec Improvements in and relating to ferrite compositions
NO88184A (en) * 1953-12-21
US2849312A (en) * 1954-02-01 1958-08-26 Milton J Peterman Method of aligning magnetic particles in a non-magnetic matrix
FR1107654A (en) * 1954-06-23 1956-01-04 Telecommunications Sa Low loss magnetic ferroceramic materials
FR1122258A (en) * 1955-02-03 1956-09-04 Centre Nat Rech Scient Ferromagnetic material and its manufacturing process
NL112277C (en) * 1955-07-01

Also Published As

Publication number Publication date
FR72272E (en) 1960-03-31
NL112299C (en) 1966-01-17
US3031405A (en) 1962-04-24
BE562891A (en)
FR1163304A (en) 1958-09-24
CH377539A (en) 1964-05-15
DE1087507B (en) 1960-08-18

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