GB820853A - Improvements in or relating to methods of manufacturing non-metallic ferromagnetic materials - Google Patents

Improvements in or relating to methods of manufacturing non-metallic ferromagnetic materials

Info

Publication number
GB820853A
GB820853A GB3748655A GB3748655A GB820853A GB 820853 A GB820853 A GB 820853A GB 3748655 A GB3748655 A GB 3748655A GB 3748655 A GB3748655 A GB 3748655A GB 820853 A GB820853 A GB 820853A
Authority
GB
United Kingdom
Prior art keywords
mno
mgo
oxides
zno
metals
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
GB3748655A
Inventor
Andre Pierrot
Yves Lescroel
Bogdan Grabowski
Charles Louis Guillaud
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 GB820853A publication Critical patent/GB820853A/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
    • C04B35/2625—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

Abstract

820,853. Magnetic compositions. LIGNES TELEGRAPHIQUES ET TELEPHONIQUES. Dec. 30, 1955 [Feb. 3, 1955; May 3, 1965], No. 37486/55. Drawings to Specification. Class 38 (2). A magnetic ferrite having a rectangular hysteresis loop, a negative coefficient of magnetostriction and containing substantially equal molecular percentages of oxides of metals in the bivalent and in the trivalent states is made by compressing a mixture of metal oxides including ferric oxide and an oxide of manganese, heating between 1200‹ and 1350‹ C. and cooling slowly in an inert atmosphere. The heating may be for 2-6 hours in nitrogen containing up to 2% by volume of oxygen, and the cooling may be for 15 hours in pure nitrogen. Other oxides of metals in the trivalent state may be of aluminium and chromium, and oxides of metals in the bivalent state may be of magnesium, zinc and cadmium. Suitable limits of proportions of starting materials are given. The percentages of oxides of metals in the bivalent and trivalent states need not be equal, part of the MnO acting as though in the Mn 2 O 3 state after the manufacturing process. The addition of ZnO increases the flux density for a given magnetizing force, and reduces the coercive force, the addition of MgO acts oppositely, without affecting the rectangularity of the loop. The effect of the addition of Al 2 O 3 or Cr 2 O 3 is similar to that of MgO, Fig. 3 (not shown). The mixture must not contain by weight more than 0.5% impurities in general and more than 0.05% of any of SiO 2 , BaO, PbO, and SrO. The oxides are ground in distilled water with iron balls. The compression may be at between 0.5-15.0 metric tons/cm.<SP>2</SP>, preferably 5 metric tons/cm.<SP>2</SP>, giving linear shrinkage of 15% upon sintering. Sufficient shrinkage, between 8 and 30%, is needed to produce mechanical strain. The sintering temperature varies with the constitution of the ferrite, which may also be presintered between 900 and 1100‹ C. and reground. The production of materials is described in which Fc 2 O 3 is associated with MnO; MnO, ZnO; MnO, MgO, ZnO; MnO, MgO; MnO, Al 2 O 3 ; MnO, Cr 2 O 3 ; MnO, MgO, ZnO, Cr 2 O 3 ; MnO, MgO, ZnO, Al 2 O 3 . Specification 820,854 is referred to.
GB3748655A 1955-02-03 1955-12-30 Improvements in or relating to methods of manufacturing non-metallic ferromagnetic materials Expired GB820853A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR684899A FR1121088A (en) 1955-02-03 1955-02-03 Ferromagnetic materials with rectangular hysteresis cycle

Publications (1)

Publication Number Publication Date
GB820853A true GB820853A (en) 1959-09-30

Family

ID=32731795

Family Applications (2)

Application Number Title Priority Date Filing Date
GB3748655A Expired GB820853A (en) 1955-02-03 1955-12-30 Improvements in or relating to methods of manufacturing non-metallic ferromagnetic materials
GB2977358A Expired GB820854A (en) 1955-02-03 1955-12-30 Improvements in or relating to non-metallic ferromagnetic materials

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB2977358A Expired GB820854A (en) 1955-02-03 1955-12-30 Improvements in or relating to non-metallic ferromagnetic materials

Country Status (6)

Country Link
BE (1) BE543302A (en)
CH (1) CH343545A (en)
DE (1) DE1239606B (en)
ES (1) ES226467A1 (en)
FR (2) FR1121088A (en)
GB (2) GB820853A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3039962A (en) * 1961-01-30 1962-06-19 Rca Corp Ferromagnetic ferrite and process of preparing same

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3031406A (en) * 1958-01-07 1962-04-24 Rca Corp Magnetic cores
ES246988A1 (en) * 1958-02-13 1959-05-16 Itt Magnetic materials of the high permeability ferrite type
NL256989A (en) * 1959-11-10
NL257266A (en) * 1959-11-10
US3226327A (en) * 1962-07-31 1965-12-28 Bell Telephone Labor Inc Ferrite compositions and method of manufacture
CN108640670B (en) * 2018-04-26 2021-03-02 湖北华磁电子科技有限公司 High Bs value and low power loss soft magnetic ferrite material and preparation method of magnetic core

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL63875C (en) * 1943-07-01
US2640813A (en) * 1948-06-26 1953-06-02 Aladdin Ind Inc Reaction product of a mixed ferrite and lead titanate
IT492518A (en) * 1951-10-30
GB737284A (en) * 1952-02-15 1955-09-21 Steatite Res Corp Rectangular loop ferro nagnetic materials
FR1051851A (en) * 1952-02-28 1954-01-19 Centre Nat Rech Scient Improvements to ferromagnetic materials in mixed ferrites of manganese, magnesium and zinc and to the manufacturing processes of said materials
GB730703A (en) * 1952-07-31 1955-05-25 Centre Nat Rech Scient Magnetic materials and methods of manufacturing such materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3039962A (en) * 1961-01-30 1962-06-19 Rca Corp Ferromagnetic ferrite and process of preparing same

Also Published As

Publication number Publication date
DE1239606B (en) 1967-04-27
GB820854A (en) 1959-09-30
FR67809E (en) 1958-03-24
FR1121088A (en) 1956-07-20
BE543302A (en) 1955-12-30
ES226467A1 (en) 1956-04-01
CH343545A (en) 1959-12-31

Similar Documents

Publication Publication Date Title
US2636860A (en) Magnetic core
GB730703A (en) Magnetic materials and methods of manufacturing such materials
US3565806A (en) Manganese zinc ferrite core with high initial permeability
US2962445A (en) Rectangular hysteresis loop ferrites
US2764552A (en) Ferromagnetic materials
GB820853A (en) Improvements in or relating to methods of manufacturing non-metallic ferromagnetic materials
GB795269A (en) Improvements in or relating to ferromagnetic ceramic materials
ES219075A1 (en) Method of producing magnet cores having an approximately rectangular shape of the hysteresis loop
GB759245A (en) Improvements in or relating to methods of manufacturing non-metallic magnetic cores having a substantially rectangular hysteresis loop
GB1226594A (en)
GB954775A (en) Improvements in methods of manufacturing sintered ferrite bodies
JPS6111892B2 (en)
GB994240A (en) Improvements in or relating to methods of manufacturing magnetic cores and magnetic cores manufactured by such methods
GB671788A (en) Ferromagnetic bodies having high insulating properties
GB802613A (en) Method of manufacture of manganese zinc ferrites
GB834230A (en) Improvements in or relating to magnetically soft ferrites having rectangular hysteresis loops
GB759248A (en) Improvements in or relating to methods of manufacturing non-metallic magnetic cores having a substantially rectangular hysteresis loop
US3057802A (en) Magnetic materials of the high permeability ferrite type
GB764118A (en) Improvements in or relating to methods of manufacturing non-metallic magnetic cores having a substantially rectangular hysteresis loop
GB669571A (en) Improvements in or relating to magnet cores for electromagnetic devices
JPS6253446B2 (en)
GB763809A (en) Improvements in or relating to a method of manufacturing a non-metallic magnetic core having a substantially rectangular hysteresis loop
US3168476A (en) Process for producing magnetic manganese-zinc ferrite with isoperm character
GB756374A (en) A method for the manufacture of ferrite cores
US2995517A (en) Ferrites containing niobium