ES294384A1 - Method of making memory core - Google Patents

Method of making memory core

Info

Publication number
ES294384A1
ES294384A1 ES0294384A ES294384A ES294384A1 ES 294384 A1 ES294384 A1 ES 294384A1 ES 0294384 A ES0294384 A ES 0294384A ES 294384 A ES294384 A ES 294384A ES 294384 A1 ES294384 A1 ES 294384A1
Authority
ES
Spain
Prior art keywords
air
per cent
mol per
core
temperature
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
ES0294384A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of ES294384A1 publication Critical patent/ES294384A1/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
    • C04B35/265—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
    • 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

Landscapes

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

Abstract

An annular magnetic core having an outer diameter of at most 0À6 mm., an inner diameter of at least half the outer diameter, a switching time of at most 0.25 Á/sec. and a value of the quotient uV1 [alpha]Vz greater than 3, with a disturbance ratio of 0.61, is obtained by sintering the presintered product of a mixture of oxides or equivalent compounds Cu,Fe and Mn in the proportions 4-6 mol per cent CuO, 38-14 mol per cent Fe 2 O 3 , 50-58 mol per cent MnO. In preparation the presintered product is mixed with polyvinyl alcohol to form a paste, the paste is inspissated to a mass having a weight 1-1 to 1-2 times the weight of the presintered product, the larger particles are sieved out, and the remaining particles are compressed into a core having a density of 2.3 to 3À0 gm./c.c. The core is then heated within 1 minute in air or an air-oxygen mixture to a temperature between 1040 C. and 1120 C. on a high melting-point metal (platinum) or metal alloy (platinum rhodium) plate, held at this temperature for 1:5 to 10 minutes, cooled during 30 minutes by at least 70 C. and quenched in air at room temperature.
ES0294384A 1962-12-13 1963-12-11 Method of making memory core Expired ES294384A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL286714 1962-12-13

Publications (1)

Publication Number Publication Date
ES294384A1 true ES294384A1 (en) 1964-01-16

Family

ID=19754282

Family Applications (1)

Application Number Title Priority Date Filing Date
ES0294384A Expired ES294384A1 (en) 1962-12-13 1963-12-11 Method of making memory core

Country Status (10)

Country Link
US (1) US3297576A (en)
AT (1) AT241865B (en)
BE (1) BE641145A (en)
CH (1) CH453514A (en)
DE (1) DE1471341B2 (en)
DK (1) DK116383B (en)
ES (1) ES294384A1 (en)
FR (1) FR1382406A (en)
GB (1) GB1060609A (en)
NL (1) NL286714A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6403377A (en) * 1964-03-28 1965-09-29

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2818387A (en) * 1954-10-28 1957-12-31 Philips Corp Square loop ferromagnetic material
NL210710A (en) * 1956-09-17
NL256173A (en) * 1959-11-16

Also Published As

Publication number Publication date
GB1060609A (en) 1967-03-08
NL286714A (en) 1965-12-10
BE641145A (en) 1964-06-11
CH453514A (en) 1968-06-14
DK116383B (en) 1970-01-05
US3297576A (en) 1967-01-10
FR1382406A (en) 1964-12-18
DE1471341A1 (en) 1969-04-10
DE1471341B2 (en) 1971-09-16
AT241865B (en) 1965-08-10

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