ES393851A1 - Ferrite particles for flexible permenent magnets - Google Patents

Ferrite particles for flexible permenent magnets

Info

Publication number
ES393851A1
ES393851A1 ES393851A ES393851A ES393851A1 ES 393851 A1 ES393851 A1 ES 393851A1 ES 393851 A ES393851 A ES 393851A ES 393851 A ES393851 A ES 393851A ES 393851 A1 ES393851 A1 ES 393851A1
Authority
ES
Spain
Prior art keywords
particles
ferrite particles
fe2o3
ferrite
alpha
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
ES393851A
Other languages
Spanish (es)
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of ES393851A1 publication Critical patent/ES393851A1/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
    • H01F1/032—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 hard-magnetic materials
    • H01F1/10—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
    • H01F1/113—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
    • H01F1/117—Flexible bodies
    • 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

Abstract

1.- A procedure for manufacturing barium ferrite particles, which comprises the operations of: (1) homogeneously mixing (a) Fe2O3 alpha, and (b) CO3Ba or an equivalent source of barium oxide, in sufficient quantity to give, by reaction with Fe2O3 alpha, a ferrite of the generalized formula BaFe12O19, (2) calcining the mixture, (3) grinding the calcined product, (4) annealing the ground particles, and (5) treating the annealed ferrite particles aqueous acid to extract undesirable reaction products and any unreacted materials, and further characterized by adding, in step (1), about 1-3 weight percent Bi2O3 and about 1-6 weight percent of fluxing agent, carry out the calcination, in operation (2) at 950º-1150ºC, continue grinding, in operation (3), until the particles are submicron-sized, and anneal, in operation (4), at 900º-1000ºC. (Machine-translation by Google Translate, not legally binding)
ES393851A 1970-08-12 1971-08-02 Ferrite particles for flexible permenent magnets Expired ES393851A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6329870A 1970-08-12 1970-08-12

Publications (1)

Publication Number Publication Date
ES393851A1 true ES393851A1 (en) 1973-09-16

Family

ID=22048282

Family Applications (1)

Application Number Title Priority Date Filing Date
ES393851A Expired ES393851A1 (en) 1970-08-12 1971-08-02 Ferrite particles for flexible permenent magnets

Country Status (8)

Country Link
BE (1) BE771171A (en)
CA (1) CA961257A (en)
DE (1) DE2140320A1 (en)
ES (1) ES393851A1 (en)
FR (1) FR2104251A5 (en)
GB (1) GB1354598A (en)
NL (1) NL7110643A (en)
SE (1) SE362979B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4057606A (en) * 1972-07-14 1977-11-08 Fuji Electrochemical Co., Ltd. Method of producing anisotropic ferrite magnet
DE2401934C3 (en) * 1974-01-16 1981-05-14 Fuji Electrochemical Co., Ltd., Tokyo Method of manufacturing an anisotropic ferrite magnet
US4200547A (en) * 1979-01-02 1980-04-29 Minnesota Mining And Manufacturing Company Matrix-bonded permanent magnet having highly aligned magnetic particles
NL7907717A (en) * 1979-10-19 1981-04-22 Philips Nv DEVICE FOR DISPLAYING COLORED IMAGES.
JPS5941806A (en) * 1982-08-31 1984-03-08 Toda Kogyo Corp Manufacture of tabular ba ferrite particle powder for magnetic recording
US4881988A (en) * 1987-11-16 1989-11-21 Rjf International Corporation Novel flexible magnet for use in small dc motors
DE19910182B4 (en) * 1999-03-08 2013-12-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method for producing and magnetizing permanent magnetic films

Also Published As

Publication number Publication date
NL7110643A (en) 1972-02-15
GB1354598A (en) 1974-06-05
SE362979B (en) 1973-12-27
CA961257A (en) 1975-01-21
BE771171A (en) 1972-02-11
FR2104251A5 (en) 1972-04-14
AU3218371A (en) 1973-02-15
DE2140320A1 (en) 1972-10-19

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