US3372123A - Method for manufacturing lithiumnickel-manganese ferrite magnetic memory cores - Google Patents
Method for manufacturing lithiumnickel-manganese ferrite magnetic memory cores Download PDFInfo
- 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
- Authority
- 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
Links
- 230000005291 magnetic effect Effects 0.000 title description 12
- 229910000859 α-Fe Inorganic materials 0.000 title description 8
- 238000000034 method Methods 0.000 title description 7
- 238000004519 manufacturing process Methods 0.000 title description 5
- 229910052748 manganese Inorganic materials 0.000 title description 2
- 239000011572 manganese Substances 0.000 title description 2
- 239000000203 mixture Substances 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 1
- ZYXUQEDFWHDILZ-UHFFFAOYSA-N [Ni].[Mn].[Li] Chemical compound [Ni].[Mn].[Li] ZYXUQEDFWHDILZ-UHFFFAOYSA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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
- C04B35/2616—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:
Landscapes
- 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)
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 |
Family
ID=19753850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 (is") |
| AT (1) | AT241138B (is") |
| BE (1) | BE632810A (is") |
| CH (1) | CH428013A (is") |
| DE (1) | DE1471340B2 (is") |
| DK (1) | DK116144B (is") |
| ES (1) | ES288241A1 (is") |
| FR (1) | FR1358754A (is") |
| GB (1) | GB994240A (is") |
| NL (2) | NL135253C (is") |
| OA (1) | OA00820A (is") |
Cited By (4)
| 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 (is") * | 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)
| 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)
| 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 |
-
0
- NL NL278942D patent/NL278942A/xx unknown
-
1962
- 1962-05-25 NL NL135253D patent/NL135253C/xx active
-
1963
- 1963-05-21 DE DE19631471340 patent/DE1471340B2/de active Pending
- 1963-05-22 DK DK244563AA patent/DK116144B/da unknown
- 1963-05-22 AT AT413563A patent/AT241138B/de active
- 1963-05-22 CH CH640163A patent/CH428013A/de unknown
- 1963-05-22 GB GB20383/63A patent/GB994240A/en not_active Expired
- 1963-05-22 ES ES288241A patent/ES288241A1/es not_active Expired
- 1963-05-24 FR FR935940A patent/FR1358754A/fr not_active Expired
- 1963-05-24 BE BE632810D patent/BE632810A/xx unknown
-
1964
- 1964-12-16 OA OA50899A patent/OA00820A/xx unknown
-
1966
- 1966-05-24 US US552631A patent/US3372123A/en not_active Expired - Lifetime
Patent Citations (8)
| 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)
| 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 (is") * | 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 |
|---|---|
| NL135253C (is") | 1972-05-15 |
| CH428013A (de) | 1967-01-15 |
| GB994240A (en) | 1965-06-02 |
| DE1471340B2 (de) | 1971-07-01 |
| DK116144B (da) | 1969-12-15 |
| DE1471340A1 (de) | 1970-02-05 |
| ES288241A1 (es) | 1963-12-01 |
| FR1358754A (fr) | 1964-04-17 |
| BE632810A (is") | 1963-11-25 |
| AT241138B (de) | 1965-07-12 |
| NL278942A (is") | |
| OA00820A (fr) | 1967-11-15 |
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