US3168476A - Process for producing magnetic manganese-zinc ferrite with isoperm character - Google Patents

Process for producing magnetic manganese-zinc ferrite with isoperm character Download PDF

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Publication number
US3168476A
US3168476A US86897A US8689761A US3168476A US 3168476 A US3168476 A US 3168476A US 86897 A US86897 A US 86897A US 8689761 A US8689761 A US 8689761A US 3168476 A US3168476 A US 3168476A
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isoperm
mole percent
character
percent
ferrite
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US86897A
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English (en)
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Moser Erich
Ross Erich
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Siemens and Halske AG
Siemens AG
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Siemens AG
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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
    • C04B35/2658—Other ferrites containing manganese or zinc, e.g. Mn-Zn ferrites

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  • the isoperm character is realized in connection with magnetic materials the hysteresis loop of which has, in addition to a relatively low remanence induction and corcive power, as. far reachingas possible a linear parallelism of the inclined branches of: the hysteresis loop.
  • isoperm character is intended to mean that the hysteresis loop is in its middle part described by an obliquely extendingparallelogram the width of which corresponds to twice the coercive powenii and the height of which corresponds at least to twice the remanence induction B
  • the remanence induction shall amount to less than about 25 percent of the saturation induction B
  • Theproperties of such isoperm magnetic materials are for many instances of use extraordinarily advanta- Such magnetic materials offer as compared with magnetic materials with normal hysteresis loop great advantages, particularly as core materialsfforjhighgrade filter coils.
  • the isoperm ferrites according to the invention show, in addition to the. general advantages .offerrites so far as eddy current losses and high initial permeability are concerned, low remanence and with increasing field strength only slight increase of permeability up to maximum permeability. The hysteresis losses are moreover .very low. .The'alignment error of the reversible permeability is likewise slight.
  • the initial permeability is with ferrites according to the invention very constant as to time and relatively insensitive totemporary magnetic or thermal loads.
  • the ferrites produced according to the invention are very densely sintered, so that the isoperm-like hysteresis loop obviously cannot be traced to a shearing of the ferrite which would produce unfavorable and, of course, un-
  • the ferrites according to the invention do not require, any treatmentin a magnetic'field.
  • ferrites knownjwith an isoperm loop which areproducedby particular magnetic field treatment from socalled lerminvar ferrites.
  • frne sintered ferrite body is cooledin aninert gasa'trriosplie ample, in nitrogen.
  • Disturbing substances are particularly those elements the ion radii of which are greaterthanwthe ion radius of the largest element partaking in the "buildingup of the ferrite grid, in the present case,the manganese.
  • the region with less *than" lounole -percent ZnO is distinguished by high Curie'temperatures (T above 250 C. and high valtiesof-"the saturat ion magnetization in the produced ferrite which are only slightlyi dependent upon the temperature.
  • i Q i i V The oxides composed according to the invention. from the region of the three Substance diagram are mixed wet for about ,six hours, fonexampl inaro cker ill,
  • Cores are now formed from the resulting powder by pressure molding and such cores are sinteredflin air, nitrogen oran air-nitrogen mixture or first'in air and thereafter in nitrogen, at temperatures between 1240" C. and 1350" C. for one to fifteenhours, preferably for two hours, whereupon they are cooled in an inert-gasfatmosphere, for example, in pure nitrogen.
  • the formation of the isoperm eharacter is favored by rapid cooling from the sinter temperature to I a temperature from 9005C. to 500 O-within-aninterval from five to fif teen minutes.
  • Such-rapid cooling is particularly indicated in the case of, coresthe dimensions of which are'at least in one. direction very small,--for example ring cores with athic kness'of onlyonemillimeter or less.
  • the ferrites produced according to the. invention thaye initial permeabilities from about a ZOOOtbJOOtL-relative temporal inconstancy values -i smaller than 5.10 and incidental reference hysteresis value 71/zi smaller than 0510-? cm./ka.; whereirf'h ,is” Jordans incide'ntal hysteresis value (see, for example, M.
  • Example 1 i Composition:
  • the oxides which are constituted so that the total impurities in the end product amount to lessthani0.2 .percent by weight, arewith the additionof water in an amount of three times that of the oxides, intermixed by ther with an addition of a binder agent, for two hours, whereupon rings are pressure molded therefrom. which are sintered for one hour in nitrogen at 1280 C.
  • the rings have an outer diameter of 20 millimeters and a thickness of 6 millimeters.
  • the cooling from the sinter temperature to normal temperature is effected within twelve hours in pure nitrogen with an oxygen content of less than 0.02 percent by volume.
  • the ferrites exhibited the following characteristic magnetic values:
  • Cores formed as described in the first example are sintered at 1320 C. for two hours in nitrogen containing 7 percent by volume oxygen, and thereupon rapidly cooled to 850 C., within ten minutes, in nitrogen containing 0.2 percent by volume oxygen. The further cooling to room temperature is efiected within six hours in nitrogen with 0.2 percent There resulted the following values:
  • the iron oxide used in this example had a tetra threadlike particle structure.
  • the initial raw materials are constituted so that the end product contains substantially only the impurities noted in percent by weight, namely, 0.02 percent SiO 0.02 percent TiO 0.002 percent A1 0 0.02 percent CaO'.
  • Cores produced as described in the first example are sintered at 1270 C. first for three hours in air and thereafter for twelve hours in nitrogen with an oxygen content of less than 0.02 volume percent, whereupon they are slowly cooled to room temperature, within about ten hours, in nitrogen. The following values were measured:
  • FIG. 1 shows the hysteresis loop of a magnetic material With isoperm structure
  • FIG. 2 represents the three substance diagram with the area or region according to the invention
  • FIG. 3 shows the hysteresis loop of an isoperrn ferrite made according to Example 1.
  • FIG. 4 shows the course of the reversible permeability of an isoperm ferrite made according to Example 3, in dependence upon the field strength.
  • the three-substance diagram Fe O -MnO-ZnO, represented in FIG. 2 shows the area provided by the present invention which contains the quantitative composition of the initial oxides employed in the new method.
  • Numerals l, 2 and 3 indicate the corner points for which numerical values are specified in the claims.
  • the remanence induction B lies at about 0.75K gauss and the coercive power H at about 0.07 ma./cm.
  • a method of producing a soft magnetic ferrite with isoperm character on the basis of iron-manganese-zinc comprising the steps, following sintering of the molded material, of initially quickly cooling the same within about 5 to 15 minutes, from the sinter temperature to a temperature between 900 C. and 500 C., in an inert gas atmosphere containing less than 0.5 volume percent oxygen, and thereafter gradually cooling it to room temperature.

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  • 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)
US86897A 1960-03-14 1961-02-03 Process for producing magnetic manganese-zinc ferrite with isoperm character Expired - Lifetime US3168476A (en)

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DES0067557 1960-03-14

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US (1) US3168476A (ja)
DE (1) DE1302342C2 (ja)
DK (1) DK117791B (ja)
GB (1) GB940234A (ja)
NL (1) NL262122A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860524A (en) * 1969-12-29 1975-01-14 Spang Ind Inc High permeability manganese-zinc ferrites
CN110824395A (zh) * 2019-11-26 2020-02-21 上海宝钢磁业有限公司 基于居里温度和磁感应强度快速确定贫铁锰锌铁氧体成分的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0551907B1 (en) * 1992-01-14 1997-04-09 Matsushita Electric Industrial Co., Ltd. An oxide magnetic material

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636860A (en) * 1944-07-06 1953-04-28 Hartford Nat Bank & Trust Co Magnetic core
US2886529A (en) * 1952-07-31 1959-05-12 Centre Nat Rech Scient Magnetic materials and their methods of manufacture
US2924573A (en) * 1956-05-10 1960-02-09 Int Standard Electric Corp Process of making manganese-zinc-ferrite
US2956024A (en) * 1957-04-01 1960-10-11 Western Electric Co Method of making magnetic cores

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636860A (en) * 1944-07-06 1953-04-28 Hartford Nat Bank & Trust Co Magnetic core
US2886529A (en) * 1952-07-31 1959-05-12 Centre Nat Rech Scient Magnetic materials and their methods of manufacture
US2924573A (en) * 1956-05-10 1960-02-09 Int Standard Electric Corp Process of making manganese-zinc-ferrite
US2956024A (en) * 1957-04-01 1960-10-11 Western Electric Co Method of making magnetic cores

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860524A (en) * 1969-12-29 1975-01-14 Spang Ind Inc High permeability manganese-zinc ferrites
CN110824395A (zh) * 2019-11-26 2020-02-21 上海宝钢磁业有限公司 基于居里温度和磁感应强度快速确定贫铁锰锌铁氧体成分的方法

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Publication number Publication date
DK117791B (da) 1970-06-01
DE1302342B (ja) 1971-02-25
DE1302342C2 (de) 1974-01-03
NL262122A (ja)
GB940234A (en) 1963-10-30

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