US3372123A - Method for manufacturing lithiumnickel-manganese ferrite magnetic memory cores - Google Patents

Method for manufacturing lithiumnickel-manganese ferrite magnetic memory cores Download PDF

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Publication number
US3372123A
US3372123A US552631A US55263166A US3372123A US 3372123 A US3372123 A US 3372123A US 552631 A US552631 A US 552631A US 55263166 A US55263166 A US 55263166A US 3372123 A US3372123 A US 3372123A
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US
United States
Prior art keywords
manufacturing
temperature
lithiumnickel
magnetic memory
ferrite magnetic
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 - Lifetime
Application number
US552631A
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English (en)
Inventor
Esveldt Cornelis Jacobus
Gorter Evert Willem
Peloschek Hans Peter
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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Publication of US3372123A publication Critical patent/US3372123A/en
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    • 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

Definitions

  • ABSTRACT OF THE DISCLOSURE A method of manufacturing magnetic core elements, useful as storage elements, and having a rectangular hysteresis loop, in which a mixture of lithium, nickel, manganese, and ferric oxides, after calcining, is compacted into annular cores which are heated to between 1200 C. and 1400 C. for not more than ten minutes in a water-free atmosphere.
  • magnetic cores as storage elements it is desirable to limit the occurrence of eddy currents as far as possible, so that magnetically soft, oxidic materials are used more andmore as raw materials for such cores, which materials have, as is well-known, a very low electric conductivity.
  • the period which elapses between the beginning of the control current pulse and the moment at which the output 'voltage of the one-signal attains its maximum value is substantially; constant, For practical reasons the; beginning 'of the 'control current pulse is not used but the momentat which the control current reaches a strength of 10% of its maximum value-The term peak time (T ;of a magnetic core is then to be understood to mean the time which elapses between the instant at which the control cfurrent reaches a strength of 10% of its maximum valuefand the instant at which the output voltage of the one-signal, which is produced by the relevant control curnaturally dependent upon the time of rise (1,) of the control current pulse. In the experiments having led to the present invention, this time of rise was invariably 0.15 microsecond.
  • a sutficiently great rectangular ratio of the hysteresis loop but of which also the output voltage of the onesignal, as well as the peak time, are not dependent on temperature or to a small extent only within a wide range of temperatures (preferably between 40 C. and (3.).
  • magnetic cores consisting of lithium-manganese-(nickel) ferrites, within a range of compositions to be defined hereinafter and manufac-' tured by a method described hereinafter, have current pulse characteristics which render them highly suitable for use as storage elements.
  • the present invention relates to a method of manufacturing magnetic cores suitable for use as magnetic storage elements by sintering a mass of oxides of lithium, manganese, iron and possibly nickel, and/or compounds of said metals which change to the oxides when strongly heated, which mass has been molded before into the desired shape and, presintered at a temperature lower than 800 C., and it is characterised in that the relative quantitles of the said metals in the mass to be sintered, expressed in mol percent of the oxides Li O, MnO, Fe O and possibly NiO, are:
  • Magnetic cores manufactured in accordance with the invention are compared, as to their suitability for use as storage cores, with known magnetic cores consisting of manganese-magnesium-(zinic) ferrites, manganesecopper-(zinc) ferrites or lithium-manganese ferrites the following is found.
  • Magnetic cores manufactured in accordance with the invention if containing higher contents of manganese, are distinguished, with properties otherwise equivalent to those of the aforementioned known magnetic cores, by a strikingly high value of the output voltage of the one-signal. In the case of lower contents of manganese they have, as special favorable properties a very low temperature coefficient of the output voltage of the one-signal and a very low temperature coefficient What is claimed is:

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Magnetic Ceramics (AREA)
  • Soft Magnetic Materials (AREA)
  • Hard Magnetic Materials (AREA)
US552631A 1962-05-25 1966-05-24 Method for manufacturing lithiumnickel-manganese ferrite magnetic memory cores Expired - Lifetime US3372123A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL278942 1962-05-25

Publications (1)

Publication Number Publication Date
US3372123A true US3372123A (en) 1968-03-05

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ID=19753850

Family Applications (1)

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US552631A Expired - Lifetime US3372123A (en) 1962-05-25 1966-05-24 Method for manufacturing lithiumnickel-manganese ferrite magnetic memory cores

Country Status (11)

Country Link
US (1) US3372123A (da)
AT (1) AT241138B (da)
BE (1) BE632810A (da)
CH (1) CH428013A (da)
DE (1) DE1471340B2 (da)
DK (1) DK116144B (da)
ES (1) ES288241A1 (da)
FR (1) FR1358754A (da)
GB (1) GB994240A (da)
NL (2) NL135253C (da)
OA (1) OA00820A (da)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3477960A (en) * 1967-08-23 1969-11-11 Ampex Preparation of lithium-manganese ferrite
US3523901A (en) * 1966-12-28 1970-08-11 Hitachi Ltd Magnetic material having square hysteresis loop characteristic and a memory core made of the same
JPS5427560B1 (da) * 1971-03-10 1979-09-11
US6503156B1 (en) 1993-06-01 2003-01-07 Spalding Sports Worldwide, Inc. Golf ball having multi-layer cover with unique outer cover characteristics

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2663360A (en) * 1951-05-03 1953-12-22 Englander Co Inc Seat
DE1671022B1 (de) * 1966-03-17 1971-05-19 Siemens Ag Verwendung von lithiumferriten

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2882234A (en) * 1953-12-21 1959-04-14 Philips Corp Method of producing magnet cores having an approximately rectangular shape of the hysteresis loop
US3034987A (en) * 1957-12-31 1962-05-15 Rca Corp Magnetic cores
US3038860A (en) * 1956-12-20 1962-06-12 Francis E Vinal Lithium nickel ferrites
US3039962A (en) * 1961-01-30 1962-06-19 Rca Corp Ferromagnetic ferrite and process of preparing same
US3054752A (en) * 1959-11-10 1962-09-18 Ibm Square loop magnetic manganeseferrite material and manufacture thereof
US3065182A (en) * 1959-11-17 1962-11-20 Ibm Low flux density ferromagnetic material
US3093588A (en) * 1960-04-04 1963-06-11 Ampex Lithium ferrites
US3226328A (en) * 1962-01-05 1965-12-28 Philips Corp Method for making lithium nickel ferrite having a substantially rectangular hysteresis loop

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2882234A (en) * 1953-12-21 1959-04-14 Philips Corp Method of producing magnet cores having an approximately rectangular shape of the hysteresis loop
US3038860A (en) * 1956-12-20 1962-06-12 Francis E Vinal Lithium nickel ferrites
US3034987A (en) * 1957-12-31 1962-05-15 Rca Corp Magnetic cores
US3054752A (en) * 1959-11-10 1962-09-18 Ibm Square loop magnetic manganeseferrite material and manufacture thereof
US3065182A (en) * 1959-11-17 1962-11-20 Ibm Low flux density ferromagnetic material
US3093588A (en) * 1960-04-04 1963-06-11 Ampex Lithium ferrites
US3039962A (en) * 1961-01-30 1962-06-19 Rca Corp Ferromagnetic ferrite and process of preparing same
US3226328A (en) * 1962-01-05 1965-12-28 Philips Corp Method for making lithium nickel ferrite having a substantially rectangular hysteresis loop

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3523901A (en) * 1966-12-28 1970-08-11 Hitachi Ltd Magnetic material having square hysteresis loop characteristic and a memory core made of the same
US3477960A (en) * 1967-08-23 1969-11-11 Ampex Preparation of lithium-manganese ferrite
JPS5427560B1 (da) * 1971-03-10 1979-09-11
US6503156B1 (en) 1993-06-01 2003-01-07 Spalding Sports Worldwide, Inc. Golf ball having multi-layer cover with unique outer cover characteristics

Also Published As

Publication number Publication date
NL278942A (da)
NL135253C (da) 1972-05-15
FR1358754A (fr) 1964-04-17
ES288241A1 (es) 1963-12-01
OA00820A (fr) 1967-11-15
AT241138B (de) 1965-07-12
CH428013A (de) 1967-01-15
DE1471340A1 (de) 1970-02-05
BE632810A (da) 1963-11-25
DE1471340B2 (de) 1971-07-01
GB994240A (en) 1965-06-02
DK116144B (da) 1969-12-15

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