US2905641A - Method of manufacturing a magnet core having an approximately rectangular hysteresis loop - Google Patents
Method of manufacturing a magnet core having an approximately rectangular hysteresis loop Download PDFInfo
- Publication number
- US2905641A US2905641A US476532A US47653254A US2905641A US 2905641 A US2905641 A US 2905641A US 476532 A US476532 A US 476532A US 47653254 A US47653254 A US 47653254A US 2905641 A US2905641 A US 2905641A
- Authority
- US
- United States
- Prior art keywords
- hysteresis loop
- approximately rectangular
- manufacturing
- magnet core
- rectangular hysteresis
- 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
- 238000004519 manufacturing process Methods 0.000 title description 4
- 239000000203 mixture Substances 0.000 claims description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims description 6
- 230000005294 ferromagnetic effect Effects 0.000 claims description 4
- 230000005291 magnetic effect Effects 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 4
- 239000003302 ferromagnetic material Substances 0.000 description 4
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 4
- 239000005751 Copper oxide Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910000431 copper oxide Inorganic materials 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000015654 memory Effects 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 229940093474 manganese carbonate Drugs 0.000 description 2
- 235000006748 manganese carbonate Nutrition 0.000 description 2
- 239000011656 manganese carbonate Substances 0.000 description 2
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 description 2
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005307 ferromagnetism Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
Definitions
- Magnet cores having an approximately rectangular hysteresis loop are of importance for various uses.
- This kind of cores is used inter alia for so-called magnetic memories (cf. for example W. N. Papian, Proceedings of the I.R.E., April 1952, pages 475 to 478, and D. R. Brown and E. Albers-Schoenberg, Electronics, April 1953, pages 146 to 149).
- Such magnetic memories are used inter alia in counting machines and automatic pilots. A further use is made of these cores in magnetic switches.
- FIG. 1 and 2 show portions of hysteresis loops of a ferromagnetic material.
- the measure to which the shape of the hysteresis loop approaches that of a rectangle may be expressed quantitatively in various ways.
- a conventional measure may be the quotient a B cl
- B designates the remanent inductance
- B the inductance at which the hysteresis loop just closes. In practice it is often not easy to measure B with great accuracy.
- an approximately correct value of B may be readily found by taking the average of the inductances subsequent to partial magnetisation and partial demagnetisation (with intermediate saturation), the two inductances being measured at the same field strength, which is chosen to be such that the said in ductances differ from one another more than 1% but less than 3%.
- the coercivity H should be low (preferably not higher than 10 oersteds and preferably even lower than 5 oersteds), since otherwise the electromagnetic losses would be too high.
- magnet cores having an approximately rectangular hysteresis loop in which the conditions and/or (R,),,,,,,, 0.6 and H 4 oersteds are fulfilled may be obtained by manufacturing them from a material consisting mainly of at least one compound of the formula:
- Example A mixture of copper oxide, CuO, manganese carbonate, MnCO and iron oxide, Fe O is ground in alcohol for five hours and then preheated in air at 900 C. for one hour. Subsequent to cooling the reaction product is ground again in alcohol for two hours, after which the ground product is moulded to form a ring. This ring is heated at about 1350" C. in oxygen for two hours.
- annular cores of different compositions are obtained.
- the following table indicates the composition, the value of the quotient the value of (Rg and the value of H Composition i (Rog... H,
- a ferromagnetic ferrite having a substantially square hysteresis loop consisting essentially of a composition having the formula in which x is between 0.05 and 0.2 and y is less than 0.7, said ferrite having a coercive force of less than 4 oersteds, and at least one of the following properties: (a) Br/B greater than 0.7, and (b) (R greater than 0.6, said ferrite being obtained by firing in an atmosphere consisting essentially of oxygen at a temperature of about 4 1350 to 1400" C. a finely-divided mixture of copper oxide, manganese oxide, and ferric oxide in proportions corresponding to said formula.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (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 |
|---|---|---|---|
| NL183828 | 1953-12-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2905641A true US2905641A (en) | 1959-09-22 |
Family
ID=19750639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US476532A Expired - Lifetime US2905641A (en) | 1953-12-22 | 1954-12-20 | Method of manufacturing a magnet core having an approximately rectangular hysteresis loop |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US2905641A (de) |
| BE (1) | BE534279A (de) |
| CH (1) | CH345393A (de) |
| DE (1) | DE977635C (de) |
| ES (1) | ES219076A1 (de) |
| FR (1) | FR1116334A (de) |
| GB (1) | GB759248A (de) |
| NL (1) | NL82276C (de) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3054752A (en) * | 1959-11-10 | 1962-09-18 | Ibm | Square loop magnetic manganeseferrite material and manufacture thereof |
| US3083164A (en) * | 1959-11-10 | 1963-03-26 | Ibm | Method of producing ferrite bodies |
| US3188290A (en) * | 1958-06-03 | 1965-06-08 | Philips Corp | Method of manufacturing a magnet core for use as a memory element |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL111145C (de) * | 1956-09-17 | |||
| US2987481A (en) * | 1956-10-15 | 1961-06-06 | Ibm | Manganese-zinc ferrite |
| US3177145A (en) * | 1963-02-04 | 1965-04-06 | Ibm | Manganese copper ferrite composition containing titanium and germanium and method ofpreparation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB671788A (en) * | 1950-05-23 | 1952-05-07 | Steatite Res Corp | Ferromagnetic bodies having high insulating properties |
| GB697219A (en) * | 1951-10-30 | 1953-09-16 | Steatite Res Ccrporation | Ferromagnetic ceramic materials with hysteresis loops of rectangular shape |
| US2715109A (en) * | 1954-06-14 | 1955-08-09 | Steatite Res Corp | Ferromagnetic ceramic materials with hysteresis loops of rectangular shape |
| US2818387A (en) * | 1954-10-28 | 1957-12-31 | Philips Corp | Square loop ferromagnetic material |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL61937C (de) * | 1941-10-24 | 1948-11-15 | ||
| CH247856A (de) * | 1943-05-15 | 1947-03-31 | Philips Nv | Magnetischer Kern und Verfahren zu dessen Herstellung. |
| US2636860A (en) * | 1944-07-06 | 1953-04-28 | Hartford Nat Bank & Trust Co | Magnetic core |
| US2656319A (en) * | 1949-01-03 | 1953-10-20 | Aladdin Ind Inc | Magnetic core composition and method of producing the same |
-
0
- NL NL82276D patent/NL82276C/xx active
- BE BE534279D patent/BE534279A/xx unknown
-
1954
- 1954-12-18 ES ES0219076A patent/ES219076A1/es not_active Expired
- 1954-12-19 DE DEN9931A patent/DE977635C/de not_active Expired
- 1954-12-20 US US476532A patent/US2905641A/en not_active Expired - Lifetime
- 1954-12-20 CH CH345393D patent/CH345393A/de unknown
- 1954-12-21 FR FR1116334D patent/FR1116334A/fr not_active Expired
- 1954-12-22 GB GB37111/54A patent/GB759248A/en not_active Expired
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB671788A (en) * | 1950-05-23 | 1952-05-07 | Steatite Res Corp | Ferromagnetic bodies having high insulating properties |
| GB697219A (en) * | 1951-10-30 | 1953-09-16 | Steatite Res Ccrporation | Ferromagnetic ceramic materials with hysteresis loops of rectangular shape |
| US2715109A (en) * | 1954-06-14 | 1955-08-09 | Steatite Res Corp | Ferromagnetic ceramic materials with hysteresis loops of rectangular shape |
| US2818387A (en) * | 1954-10-28 | 1957-12-31 | Philips Corp | Square loop ferromagnetic material |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3188290A (en) * | 1958-06-03 | 1965-06-08 | Philips Corp | Method of manufacturing a magnet core for use as a memory element |
| US3054752A (en) * | 1959-11-10 | 1962-09-18 | Ibm | Square loop magnetic manganeseferrite material and manufacture thereof |
| US3083164A (en) * | 1959-11-10 | 1963-03-26 | Ibm | Method of producing ferrite bodies |
Also Published As
| Publication number | Publication date |
|---|---|
| CH345393A (de) | 1960-03-31 |
| FR1116334A (fr) | 1956-05-07 |
| BE534279A (de) | |
| NL82276C (de) | |
| GB759248A (en) | 1956-10-17 |
| ES219076A1 (es) | 1955-12-16 |
| DE977635C (de) | 1967-11-02 |
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