US3652416A - Oxide magnetic materials - Google Patents

Oxide magnetic materials Download PDF

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Publication number
US3652416A
US3652416A US872094A US3652416DA US3652416A US 3652416 A US3652416 A US 3652416A US 872094 A US872094 A US 872094A US 3652416D A US3652416D A US 3652416DA US 3652416 A US3652416 A US 3652416A
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percent
oxide
sno
manganese
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Izuru Sugano
Tsuneo Akashi
Tetsujin Matsubara
Yoshihiro Kenmoku
Taneaki Okuda
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NEC Corp
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Nippon Electric Co Ltd
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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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  • OXIDE MAGNETIC MATERIALS lnventors lzuru Sugano; Tsuneo Akashi; Tetsujin Matsubara; Yoshihiro Kenmoku; Taneaki Okuda, all of Tokyo, Japan Assignee: Nippon Electric Company, Limited,
  • ABSTRACT Manganese-zinc ferrites consisting essentially of manganese oxide, zinc oxide and iron oxide and small but effective amount of stannic oxide and lithium oxide ranging up to about 3.2 percent by weight of stannic acid and up to about 0.125 percent by weight of lithium oxide.
  • Manganese-zinc ferrites have found extensive applications as excellent soft magnetic materials for communications use in the frequency band near 100 KHZ. and various improvements in magnetic properties have been attempted to cope with their diversified application fields. In keeping with the present-day rapid progress of communications equipment, miniaturization and high performance of magnetic cores have been in great demand, with the result that improvements in material and performance of ferrites themselves have become an important problem. 7
  • manganese-zinc ferrites with quality factors (tan 8/p.) and hysteresis loss factors (h10) less than 2 X 10 and at 100 kl-lz., respectively, have hitherto not been attainable.
  • the quality factor and the hysteresis loss factor are defined according to the following equation:
  • FIGS. 1 to 18 illustrate the manner in which the magnetic properties of the ferrites are improved by this invention.
  • the present invention resides in the addition of stannic oxide (SnO and lithium oxide (Li O), in combination to the manganese-zinc ferrite composition in amounts that effectively improves the loss characreristics of the ferrites, i.e., both the quality factor and the hysteresis loss factor.
  • Example 1 Before describing in detail the subject matter of this invention, it will be noted hereinafter from Example 1 that a remarkable effect can be obtained for improvements in both the quality and the hysteresis loss factors when a compound of tin and a compound of lithium are added together to a manganese-zinc ferrite having a basic composition containing 55.9 mol percent Fe O 38.0 mol percent MnO, and 6.1 mol percent ZnO as the main constituents so that the additives may ultimately take the form of SD02 and U 0.
  • Example 7 it will be noted that the effect of the presence of SnO, and U 0 in the ferrite composition is markedly noticeable even when a special heat treatment is applied for improving magnetic properties as disclosed in Japanese patent application, No. 62961/1967.
  • Example 8 it will also be noted that the effect of the addition of Sn0 and LL 0 per se remains substantially unchanged even when another combination of additives, such as CaO and $0, is present in varying amounts in the manganese-zinc ferrite composition.
  • iron oxide, manganese carbonate, zinc oxide, calcium oxide, and silicon oxide, together with the essential additive agents of this invention, i.e., stannic oxide and lithium carbonate, are individually weighed so as to obtain a predetermined composition and these compounds were mixed and pulverized for about 60 hours in a ball-mill using alcohol as a dispersion medium, followed by presintering the mixture for about 4 hours at about 800C, pressing into a desired shape, firing for about 8 hours at about 1180C in a nitrogen atmosphere containing 0.4 percent oxygen and then cooling. During cooling, the oxygen content in the nitrogen atmosphere is controlled.
  • FIGS. 1 and 2 in combination demonstrate that the effect of U 0 and Sn0 added together to a manganese-zinc ferrite having a basic composition of 38.0 mol percent MnO, 6.10 mol percent ZnO, and 55.90 mol percent Fe,,0 is excellent insofar as improvements in the loss characteristics tan tS/p. and h are concerned.
  • An inspection of these graphs readily reveals the following: Both tan 8/ and h are markedly improved by the addition of SnO and Li O in small but effective amounts ranging from:
  • FIGS. 3 and 4 illustrate in combination the effect of Li,0 and SnO, added together to a manganese-zinc ferrite having a basic composition of 36.0 mol percent MnO, 8.8 mol percent ZnO, and 55.2 mol percent re o,
  • very good oxide magnetic materials meeting the two conditions tan ti/u 1.0 X 10", and h 3 can be obtained by the addition of small but effective amounts of from 0.6 to 2.7 wt. percent SnO and from 0.01 to 0.1 wt. percent Li O.
  • Such markedly improved magnetic properties have heretofore not been realized.
  • FIGS. 5 and 6 illustrate in combination the effect of Li,0 and SnO added together to a manganese-zinc ferrite having a basic composition of 36.0 mol percent MnO, 9.5 mol percent ZnO, and 54.5 mol percent R 0
  • excellent oxide magnetic materials meeting the two conditions tan 6/ 1.0 X 10', and h 3 at 100 KHz. are obtained by the addition of small but effective amounts of SnO, and U 0 in the ranges expressed as 2.0 wt.% E SnO- 3.2 wt.% 0.0 1wt.% Li O 5 0.06 wt.
  • FIGS. 7 and 8 indicate in combination the effect of U 0 and Sn0 added together to a manganese-zinc ferrite having a basic composition of 34.0 mol percent MnO, 1 1.60 mol percent ZnO, and 54.4 mol percent Fe O
  • the loss characteristics of the ferrites can be markedly improved by the addition of small but effective amounts of SnO and U 0 expressed as 0.8 wt.% Sn0 2.3 wt.% 0 wt.% Li 0.07 wt.% and excellent oxide magnetic materials meeting the two conditions, tan 8],; l.2'X 10' and h 4, at 100 KHz. can be ob tained.
  • FIGS. 9 and 10 indicate in combination the effect of SnO and Li o added together to a manganese-zinc ferrite having a basic composition of 34.0 mol percent MnO, 10.75 mol percent ZnO, and 55.25 mol percent Fe O
  • excellent oxide magnetic materials meeting the two conditions tan 8/11. 1.2 X 10 and h 4 heretofore have not been realized by known methods, can be obtained by the addition of small but effective amounts of SnO and U expressed as 0 wt. SnO a 1.4 wt.% 0 wt. Li O 0.06 wt.%
  • FIGS. 11 and 12 indicate in combination the effect of SnO and Li O added together to a manganese-zinc ferrite having a basic composition of 32.0 mol percent MnO, 13.15 mol percent ZnO, and 54.85 mol percent Fe O
  • excellent oxide magnetic materials meeting the two conditions, tan Blp. 1.3
  • X l0 and h at 100 KHz. can be obtained by the addition of small but effective amounts of SnO and U 0 expressed as 0.4 wt.% E SnO 1.1 wt.% 0.01 wt.% Li O 0.05 wt.%
  • Example 7 An example for this is shown in Example 7 that follows.
  • FIGS. 13 and 14 illustrate respectively improvements in the loss characteristics tan 8/11. and h of specimens of a ferrite having the same composition as in Example 1, i.e., MnOzZ- nOzFe o 38:61:55.9 mol percent and containing Li O and SnO as additive agents, the specimens being prepared, after sintering, by subjecting to a heat treatment for 32 hours at 250C.
  • the manganese-zinc ferrites used in this example contained 0.06 wt. percent CaO and 0.02 wt. percent SiO besides SnO; and Li O.
  • the effect of combined SnO and Li,0 per se was substantially unaffected when the amounts of addition of CaO and S10 were varied as will be evident from Example 8.
  • F 10S. and 16 illustrate respectively graphs of tan Sly and h of manganese-zinc ferrites having a basic composition of 38.0 mol percent MnO, 6.1 mol percent ZnO, and 55.9 mol percent Fe,O and containing from 0 to 0.3 wt. percent CaO and from 0 to 0.04 wt. percent SiO
  • FIGS. 17 and 18 illustrate respectively graphs of tan 6/11. and h of these ferrites which contained 0.05 wt. percent U 0 and 1.5 wt. percent SnO, as another additive combination.
  • a preferred manganese-zinc ferrite composition consisting essentially of about 32.0 to 38.0 mol percent MnO, about 54.4 to 55.9 mol percent Fe O and the balance essentially ZnO, and containing about 0.01 to 0.1 weight percent Li O, about 0.4 to 3.2 weight percent $110,, less than about 0.3 weight percent CaO and less than about 0.04 weight percent S10
  • a comparison of these graphs readily demonstrates that the effect of addition of SnO, and U 0 per se is still conspicuous under the co-presence of another additive combination C210 and SiO: in varying amounts.
  • a manganese-zinc ferrite composition consisting essentially of about 28 to 40 mol percent MnO, about 51 to 58 mol percent Fe o and the balance essentially ZnO, and further containing less than about 0.3 percent by weight of calcium oxide, and, less than about 0.04 percent by weight of silicon and small but effective amounts of less than about 3.2 percent by weight of stannic oxide and less than about 0.125 percent weight of lithium oxide, said amounts of stannic oxide and lithium oxide being sufficient to effect improvements in the values of the quality factor (tan 6/;/.) and hysteresis loss factor (h of said composition, said ferrite composition being characterized by values of tan 8/;1. at KHz. of less than 1.3 l0' and h at 100 KHz. ofless than 5.
  • composition containing about 0.01 to 0.1 weight percent Li O, about 0.4 to 3.2 weight percent SnO less than about 0.3 weight percent CaO and less than about 0.04 weight percent SiO, said composition being characterized by values of tan Sly. at KHz. ofless than 1.3X10 and h at 100 KHz. ofless than 5.0.

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  • Engineering & Computer Science (AREA)
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  • Ceramic Engineering (AREA)
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  • Organic Chemistry (AREA)
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US872094A 1968-10-30 1969-10-29 Oxide magnetic materials Expired - Lifetime US3652416A (en)

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JP7954068A JPS546713B1 (enrdf_load_stackoverflow) 1968-10-30 1968-10-30

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JP (1) JPS546713B1 (enrdf_load_stackoverflow)
CA (1) CA918906A (enrdf_load_stackoverflow)
DE (1) DE1953286B2 (enrdf_load_stackoverflow)
FR (1) FR2021906A1 (enrdf_load_stackoverflow)
GB (1) GB1271706A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4372865A (en) * 1980-09-26 1983-02-08 Spang Industries, Inc. Carbonate/hydroxide coprecipitation process
US5518642A (en) * 1992-01-14 1996-05-21 Matsushita Electric Industrial Co., Ltd. Oxide magnetic material
US6858155B1 (en) 2001-12-12 2005-02-22 Spang & Company Ferrite materials, methods of preparing the same, and products formed therefrom
US20070181847A1 (en) * 2006-02-08 2007-08-09 Tdk Corporation Ferrite material
US20070267594A1 (en) * 2006-05-17 2007-11-22 Fanton Mark A Ferrite materials, methods of preparing the same, and products formed therefrom

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS565046B1 (enrdf_load_stackoverflow) * 1969-05-09 1981-02-03

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3415751A (en) * 1964-11-27 1968-12-10 Matsushita Electric Ind Co Ltd Manganese-zinc ferrites
US3492236A (en) * 1963-07-26 1970-01-27 Siemens Ag Ferromagnetic core and process for its production

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3492236A (en) * 1963-07-26 1970-01-27 Siemens Ag Ferromagnetic core and process for its production
US3415751A (en) * 1964-11-27 1968-12-10 Matsushita Electric Ind Co Ltd Manganese-zinc ferrites

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4372865A (en) * 1980-09-26 1983-02-08 Spang Industries, Inc. Carbonate/hydroxide coprecipitation process
US5518642A (en) * 1992-01-14 1996-05-21 Matsushita Electric Industrial Co., Ltd. Oxide magnetic material
US6858155B1 (en) 2001-12-12 2005-02-22 Spang & Company Ferrite materials, methods of preparing the same, and products formed therefrom
US20070181847A1 (en) * 2006-02-08 2007-08-09 Tdk Corporation Ferrite material
US20070267594A1 (en) * 2006-05-17 2007-11-22 Fanton Mark A Ferrite materials, methods of preparing the same, and products formed therefrom

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FR2021906A1 (enrdf_load_stackoverflow) 1970-07-24
DE1953286A1 (de) 1970-05-14
JPS546713B1 (enrdf_load_stackoverflow) 1979-03-30
DE1953286B2 (de) 1972-12-07
GB1271706A (en) 1972-04-26
CA918906A (en) 1973-01-16

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