JPS61256967A - Manufacture of mn-zn ferrite - Google Patents
Manufacture of mn-zn ferriteInfo
- Publication number
- JPS61256967A JPS61256967A JP60097191A JP9719185A JPS61256967A JP S61256967 A JPS61256967 A JP S61256967A JP 60097191 A JP60097191 A JP 60097191A JP 9719185 A JP9719185 A JP 9719185A JP S61256967 A JPS61256967 A JP S61256967A
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- ferrite
- mol
- basic composition
- magnetic properties
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- Prior art date
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Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
利用産業分野
この発明は、ｆａｎ Ｚｎ系フェライトの製造方法に
係り、高い焼結温度でも粗大結晶組織を生成することな
く、すぐれた磁気特性、特に低磁気損失特性を有する！
’Ｉｎ Ｚｎ系フェライトの製造方法に関する。[Detailed description of the invention] Industrial field of application The present invention relates to a method for manufacturing fan Zn-based ferrite, which does not produce a coarse crystal structure even at high sintering temperatures and has excellent magnetic properties, especially low magnetic loss properties. !
'Relating to a method for manufacturing In Zn-based ferrite.
背景技術
ｔ”ｔｎ −Ｚｎ系フェライトは、通信機器、電子計算
機、ＶＴＲ，１気ヘツド等、各種民生用機器に多用され
、それぞれの用途に応じた改良が施されている。BACKGROUND ART -Zn-based ferrites are widely used in various consumer devices such as communication equipment, electronic computers, VTRs, and single-temperature heads, and have been improved according to their respective uses.
今日の機器の小型化並びに高性能化のため、ますます、
磁気損失の少ない磁性材料が求められている。Due to the miniaturization and higher performance of today's equipment,
There is a need for magnetic materials with low magnetic loss.
かかるＭｎ −Ｚｎ系フェライトにおいて、残預損。In this Mn-Zn ferrite, there is a residual loss.
ヒスブリシス損、渦電流損の少ない材料を得る方法とし
て、従来、アルカリ金属、アルカリ土類金属の酸化物あ
るいはＡｌ２Ｏ３、”１ｒｏ２及びＣａＯを含有する１
１ｎ −Ｚｎ系フェライトが提案され、ざらには、Ｃａ
Ｏと５ＬＯ２の複合添加により、電気抵抗を大きくし、
磁気特性を向上させる手段がよく知られていた。しかし
、材料の密度を向上させるために、焼結温度を高くする
と、異常な焼結反応が起り、焼結組織が大きな結晶と小
さな結晶との混在状態を呈し、磁気特性の劣化を招来し
やすい問題があった。Conventionally, as a method for obtaining materials with low hysteresis loss and eddy current loss, alkali metal or alkaline earth metal oxides or 1 containing Al2O3, 1ro2 and CaO have been used.
1n-Zn-based ferrite has been proposed, and roughly speaking, Ca
The combined addition of O and 5LO2 increases the electrical resistance,
Means of improving magnetic properties were well known. However, when the sintering temperature is raised to improve the density of the material, an abnormal sintering reaction occurs, and the sintered structure becomes a mixture of large and small crystals, which tends to deteriorate magnetic properties. There was a problem.
一般に、ｔａｎ Ｚｎ系フェライトの製造において、
基本組成の原料に対して、添加物を仮焼前の混合時に、
あるいは基本組成の仮焼原料の粉砕時に、単独酸化物の
形にて単体あるいは複合添加し、その後に成型、焼成あ
るいはざらに、熱間静水圧プレス処理されていた。しか
し、従来製造方法においては、上記組成のフェライトの
高密度化を計り、磁気特性を向上させるには限度があり
、今日切望されている高密度でかつ磁気特性のすぐれた
低磁気損失特性を有する？ −Ｚｎ系フェライトが得ら
れなかった。Generally, in the production of tan Zn-based ferrite,
Additives are added to the raw materials of the basic composition before calcination,
Alternatively, when pulverizing a calcined raw material having the basic composition, it is added singly or in combination in the form of a single oxide, and then molded, calcined, or roughened, and hot isostatically pressed. However, with conventional manufacturing methods, there is a limit to the ability to increase the density of ferrite with the above composition and improve its magnetic properties. ? -Zn-based ferrite was not obtained.
発明の目的
この発明は、上述のＭｎ Ｚｎ系フェライトの現状に
鑑み、高い焼結温度でも粗大結晶組織を生成することな
く、高密度でかつ、すぐれた磁気特性が得られ、特に低
磁気損失特性を有するｔｌｎ −Ｚｎ系フェライトを目
的として、Ｍｎ−Ｚｎ系フェライトの磁気特性を向上さ
せることができる製造方法を目的としている。Purpose of the Invention In view of the above-mentioned current state of Mn-Zn-based ferrite, the present invention provides a ferrite that has high density and excellent magnetic properties without forming a coarse crystal structure even at high sintering temperatures, and in particular has low magnetic loss properties. The purpose of the present invention is to provide a manufacturing method capable of improving the magnetic properties of Mn-Zn ferrite.
発明の構成と効果
この発明は、一般に実施されているｔａｎ −ＺＴＩ系
フェライトの製造工程、すなわち、基本組成の原料に対
して、添加物を仮焼前の混合時に添加するか、あるいは
基本組成原料粉砕時に添加し、ついで成型、焼結あるい
は、ざらに熱間静水圧プレス処理する工程において、特
に、添加物原料の配合処理について種々検討した結果、
ＣａＯと、アルカリ金属、アルカリ土類金属あるいは７
．ｒ、Ｈの珪酸塩の１種と５ＬＯ２，Ｖ２Ｏ５，Ｃｏｏ
、 ＣＬＬＯ、Ｎｂ２Ｏ５、ＺｒＯ２のうち少なくと
も１種とからなる添加物原料を、基本組成の仮焼原料の
粉砕時に配合添加し、これを微粉砕したのち、成型、焼
結あるいは、ざらに、熱間静水圧プレス処理することに
より、従来の製造方法に比べて一段と磁気特性が向上し
たｉｎ Ｚｎ系フェライトが得られることを知見した
ものである。Structure and Effects of the Invention The present invention utilizes the commonly practiced tan-ZTI ferrite manufacturing process, that is, adding additives to the raw material of the basic composition during mixing before calcination, or adding additives to the raw material of the basic composition. As a result of various studies on the blending process of additive raw materials, especially in the process of adding during pulverization and then molding, sintering, or rough hot isostatic pressing, we found that:
CaO and alkali metals, alkaline earth metals or 7
．． One type of silicate of r, H and 5LO2, V2O5, Coo
, CLLO, Nb2O5, and at least one of ZrO2 are mixed and added at the time of pulverizing the calcined raw material of the basic composition, and after pulverizing this, molding, sintering, roughing, hot It has been discovered that by hydrostatic pressing, in Zn-based ferrite with much improved magnetic properties can be obtained compared to conventional manufacturing methods.
すなわち、この発明は、 Ｆｅ２Ｏ３５０〜７０モル％。That is, this invention: Fe2O350-70 mol%.
？０１０〜４０モル％。? 010-40 mol%.
ＺｎＯ５〜３０モル％。ZnO 5-30 mol%.
からなる基本組成に対し、
ＣａＯ０．０１ｗｔ％〜０．２ｗｔ％と、アルカリ金属
、アルカリ土類金属あるいはＺｒ、Ａｉの珪酸塩の１種
ｏ、 ｏｏ５ｗｔ％〜０．２ｗｔ％と、Ｓｉｎ、 ０．
００１ｗｔ％〜０．２ｗｔ％、Ｖ２Ｏ５０，０１ｗｔ％
〜２ｖＩｔ％、Ａｌ２２０３ ０．０１ ｗｔ％〜２ｗ
ｔ％、Ｃｏｏ ０．０１ｗｔ％〜２ｗｔ％、ＣｕＯ０
．０１ｗｔ％〜０．２ｗｔ％、Ｎｂ２Ｏ５０．０１ｗｔ
％〜０．２ｗｔ％、１ｒ０２０．０１ Ｗｔ９１ｏ〜０
．２Ｗｉ％のうち少なくとも１種を、
上記基本組成の仮焼原料に配合添加し、微粉砕したのち
成型、焼結することを特徴とするｔ’ｔｎ −ＺＴＩフ
ェライトの製造方法でおる。With respect to the basic composition consisting of: 0.01 wt% to 0.2 wt% of CaO, 5 wt% to 0.2 wt% of silicates of alkali metals, alkaline earth metals, or Zr and Al, and 0.01 to 0.2 wt% of CaO.
001wt%~0.2wt%, V2O50.01wt%
~2vIt%, Al2203 0.01 wt% ~2w
t%, Coo 0.01wt%~2wt%, CuO0
．． 01wt%~0.2wt%, Nb2O50.01wt
%~0.2wt%, 1r020.01 Wt91o~0
．． A method for producing t'tn-ZTI ferrite is characterized in that at least one of 2Wi% is blended and added to the calcined raw material having the above basic composition, which is pulverized, then molded and sintered.
この発明において、すぐれた磁気特性のＩｎｎ Ｚｎ
系フェライトが得られる理由は、以下のとおりである。In this invention, Inn Zn with excellent magnetic properties
The reason why the system ferrite can be obtained is as follows.
水系フェライトの透磁率を大きくし、保磁力を小ざくし
、かつ磁気損失を小さくするため、添加物として、Ｃａ
０．５ＬＯ２とアルカリ金属あるいはアルカリ土類金属
の酸化物、またはＭ２Ｏ３、ＺｒＯ２などを複合添加し
、焼結密度を上げるため、高温度で焼結するが、前記添
加物は、結晶粒界に遍在して、高い電気抵抗を有する層
が形成される。しかしながら、５ＬＯ２は一般に粗大結
晶組織を誘起し易く、高い電気抵抗層を消滅するため、
磁気損失を劣化させていたのである。そこで、この５Ｌ
Ｏ２を、添加物のアルカリ金属、アルカリ土類金属ある
いは７．ｒ、Ｈの珪酸塩の形にて添加すると、高温度の
焼結においても、粗大結晶組織が生成され難くなリ、均
一な結晶組織が得られ、すぐれた磁気特性が得られるの
である。In order to increase the magnetic permeability of water-based ferrite, reduce coercive force, and reduce magnetic loss, Ca is added as an additive.
0.5LO2 and oxides of alkali metals or alkaline earth metals, or M2O3, ZrO2, etc. are added in combination and sintered at high temperatures to increase the sintered density. As a result, a layer with high electrical resistance is formed. However, since 5LO2 generally tends to induce a coarse crystal structure and eliminates a high electrical resistance layer,
This caused magnetic loss to deteriorate. Therefore, this 5L
7. O2 as an additive alkali metal, alkaline earth metal or 7. When R and H are added in the form of silicate, coarse crystal structures are not easily generated even during high-temperature sintering, and a uniform crystal structure can be obtained, resulting in excellent magnetic properties.
この発明においてアルカリ金属の珪酸塩は、Ｎａｚ ５
Ｌｎｓ、ＫｚＳＬＯｓが好ましく、また、アルカリ土類
金属の珪酸塩としては、Ｃａ Ｓ Ｌ Ｏｓ、ＭｇＳ＊
０３、Ｂａ５ＬＯ３、Ｓｒ Ｓ Ｌ ０３が好ましい。In this invention, the alkali metal silicate is Naz 5
Lns, KzSLOs are preferable, and as alkaline earth metal silicates, CaSLOs, MgS*
03, Ba5LO3, Sr S L 03 are preferred.
組成の限定理由
この発明による酸化物磁性材料において、基本組成並び
に添加物の組成を限定した理由を以下に説明する。Reason for Limiting the Composition The reason for limiting the basic composition and the composition of additives in the oxide magnetic material according to the present invention will be explained below.
Ｍｎ −Ｚｎ系フェライトの基本組成を、Ｆｅ２Ｏ３５
０〜７０モル％、 ｌ−１ｎｏ １０〜４０モル％、
ＺｎＯ！ｌ＋〜３０モル％とした理由は、これ以外の組
成では、透磁率が極めて小ざくなり、また、保磁力も大
きくなりすぎて軟質磁性材料として実用的でないためで
おる。The basic composition of Mn-Zn ferrite is Fe2O35
0 to 70 mol%, l-1no 10 to 40 mol%,
ZnO! The reason why the range is 1+ to 30 mol % is that if the composition is other than this, the magnetic permeability will be extremely small and the coercive force will also be too large to be practical as a soft magnetic material.
ＣａＯは、低磁気損失を得るために添加するが、０．０
１ ｗｔ％未満では電気抵抗が小さくなり、所要の磁気
特性が得られず、また、０．２ｗｔ％を越える添加では
、焼結密度が低下し、高密度化のため焼結温度を高くす
ると、異常組織が発生しゃすくなるため、０．０１ ｗ
ｔ％から０．２ｗｔ％ｗｔ％とする。CaO is added to obtain low magnetic loss, but 0.0
If it is less than 1 wt%, the electrical resistance becomes small and the required magnetic properties cannot be obtained, and if it exceeds 0.2 wt%, the sintered density decreases, and if the sintering temperature is increased to increase the density, 0.01 w because abnormal tissues are more likely to occur.
t% to 0.2wt%wt%.
アルカリ金属、アルカリ土類金属または／Ｖ、Ｚｒの珪
酸塩の１種を添加することは、この発明の特徴であり、
５ＬＯ２の形で添加するために生成する粗大結晶組織が
防止され、すぐれた磁気特性が得られるため添加するが
、０．００５ｗｔ％未満では上記効果が少なく、また、
０．２ｗｔ％を越えると、高密度化のために焼成温度を
高くした際に逆に粗大結晶組織を生成してしまうため、
０．００５ｗｔ％〜０．２ｖｔ％の添加とする。It is a feature of this invention that one type of silicate of alkali metal, alkaline earth metal or /V, Zr is added,
When added in the form of 5LO2, coarse crystal structures are prevented and excellent magnetic properties are obtained, so it is added, but if it is less than 0.005 wt%, the above effects are small, and
If it exceeds 0.2 wt%, a coarse crystal structure will be generated when the firing temperature is increased to increase the density.
The addition amount is 0.005wt% to 0.2vt%.
また、５ＬＯ２ｏ、ｏｏｉｗｔ％未満、Ｖ２Ｏ５０．０
１ｗｔ％未満、／Ｖｚ０３０．０１ ｗｔ％未満、Ｃｏ
ｏ ０．０１ｗｔ％未満、ＣＩＯ０．０１ｗｔ％未満
、Ｎｂｚｏｓ ０．０１ｗｔ％未満、Ｚｒ０ｚ ０．
０１ｗｔ％未満では、添加効果がほとんどなく、所要の
磁気特性が得られず、Ｓ′、、０２が０．２ｗｔ％を越
え、ｖ２ｏ５が２ｗｔ％を越え、Ｍ２Ｏ３が２ｗｔ％を
越え、Ｃｏｏ カ２ｗｔ％を越え、ＣＬＬＯが０．２ｗ
ｔ％を越え、Ｎｂ ２０５が０．２ｗｔ％を越え、Ｚｒ
０ｔが０．２ｗｔ％を越える場合は、焼結時に粗大結晶
が発生し、磁気損失が多くなるため好ましくない。よっ
て、５ＬＯ２０、００１ｗｔ％〜０．２ｗｔ％、Ｖ２Ｏ
５０，０１ｗｔ％〜２ｗｔ％、Ｍ２Ｏ３０，０１Ｖ＋Ｉ
ｔ％〜２ｗｔ％、Ｃｏｏ ０．０１ｖｔ％〜２ｗｔ％
、ＣＩＬＯ０．０１ｗｔ％〜０．２ｖｔ％、ｌ”１）２
０５ ０．０１Ｗ℃％〜０．２ｗｔ％、ＺｒＯ２０，０
１Ｗ［％〜０．２ｗｔ％に限定する。Also, 5LO2o, less than ooiwt%, V2O50.0
Less than 1wt%, /Vz030.01wt%, Co
o Less than 0.01wt%, CIO less than 0.01wt%, Nbzos less than 0.01wt%, Zr0z 0.
If the amount is less than 01wt%, there is almost no addition effect and the required magnetic properties cannot be obtained, S',,02 exceeds 0.2wt%, v2o5 exceeds 2wt%, M2O3 exceeds 2wt%, and Coo 2wt%. %, CLLO is 0.2w
t%, Nb 205 exceeds 0.2wt%, Zr
If 0t exceeds 0.2 wt%, coarse crystals will be generated during sintering and magnetic loss will increase, which is not preferable. Therefore, 5LO20, 001wt%~0.2wt%, V2O
50,01wt%~2wt%, M2O30,01V+I
t%~2wt%, Coo 0.01vt%~2wt%
, CILO0.01wt%~0.2vt%, l”1)2
05 0.01W℃%~0.2wt%, ZrO20.0
1W[% to 0.2wt%.
また、この発明における主原料、添加物には、焼成によ
り酸化物となる化合物を使用することができる。Further, as the main raw materials and additives in this invention, compounds that become oxides upon firing can be used.
実施例
Ｆｅ２Ｏ３５３モル％、 ｔｒｉｏ ３１モル％、 Ｚ
ＴＩｏ １６モル％。Example Fe2O3 53 mol%, trio 31 mol%, Z
TIo 16 mol%.
からなる基本組成の原料を配合、混合したのち、８５０
℃で仮焼成した。After blending and mixing raw materials with a basic composition of 850
Temporary firing was performed at ℃.
上記の基本組成仮焼原料を、ボールミルで粉砕する際に
、基本組成に対して、第１表に示す如く、ＣａＯに、Ｚ
ｒ Ｓ ｉ ０４、Ｍ２Ｏ３３ＳｊＯ２、Ｎａ２５ＬＯ
３、Ｋ２ＳＬ０３、Ｃａ！１ｔｏｓ、ｒ１１ｇＳｊ０３
、Ｂａ５ＬＯ３、Ｓｒ Ｓ Ｌ ０３の１種と、５ｉｏ
＝、 Ｖ２Ｏ５，Ｃｏｏ 、 ＣＬＬＯ、ＦＪｂ２０ｓ
、 ＺｒＯ２のうち少なくとも１種との複合添加の形
で、添加物原料を配合、混合粉砕した。When the calcined raw material with the above basic composition is pulverized in a ball mill, as shown in Table 1, CaO, Z
r S i 04, M2O33SjO2, Na25LO
3, K2SL03, Ca! 1tos, r11gSj03
, Ba5LO3, one type of Sr S L 03, and 5io
=, V2O5,Coo, CLLO, FJb20s
, ZrO2, and at least one of ZrO2 was mixed and ground.
その後、外径３６ｍｍＸ内径２４ｍｍＸ高ざ６ｍｍ寸法
のリング状に成型し、さらに、酸素濃度を制御した窒素
ガス雰囲気で、１２５０℃、３時間の条件で焼成した。Thereafter, it was molded into a ring shape with dimensions of 36 mm in outer diameter, 24 mm in inner diameter, and 6 mm in height, and was further fired at 1250° C. for 3 hours in a nitrogen gas atmosphere with controlled oxygen concentration.
得られた焼成品の磁気特性を測定し、その結果を第１表
に示す。The magnetic properties of the obtained fired product were measured and the results are shown in Table 1.
また、比較のため、第１表に示す如く、添加物原料を単
独酸化物の形にて、基本組成の仮焼原料の粉砕時に、添
加粉砕する以外は、基本組成、添加物配合量及び成型、
焼成条件を本発明例（陽１〜３４）と同一条件として、
焼成した比較焼成品（Ｎｏ、３５〜５５）の磁気特性を
測定し、測定結果を第１表に示す。For comparison, as shown in Table 1, the additive raw materials were added in the form of a single oxide, and the basic composition, additive blending amount, and molding were performed when the calcined raw materials of the basic composition were crushed. ,
The firing conditions were the same as those of the present invention examples (positive numbers 1 to 34),
The magnetic properties of the comparative fired products (No. 35 to 55) were measured, and the measurement results are shown in Table 1.
なお、第１表におけるコア損失は、上記リング状焼成品
を巻線し、１００ｋＨｚの交流電流を流し、２０００Ｇ
のときのコア損失を測定した。In addition, the core loss in Table 1 is calculated by winding the ring-shaped fired product, passing an alternating current of 100 kHz, and heating it at 2000 G.
The core loss was measured.
第１表と第２表より明らかな如く、この発明の特徴であ
る添加物原料、ＣａＯとアルカリ金属、アルカリ土類金
属、”ｌｒ、Ｍとの珪酸塩の１種と５ＬＯ２、ｖ２ｏ５
、Ｎ１ｔ０３、Ｃｏｏ 、 ＣＬＬＯ、Ｎｂ２Ｏ５、Ｚ
ｒ０ｚの少なくとも１種の複合添加の形にて、基本組成
粉砕時に添加配合することにより、Ｍ＋＋ −ＺＴＩ系
フエライトは、高密度化と共にコア損失の低減、磁気特
性の改善に著しい効果があることが分る。As is clear from Tables 1 and 2, the additive raw materials, which are the characteristics of this invention, include CaO, an alkali metal, an alkaline earth metal, a type of silicate of "lr, M, and 5LO2, v2o5.
, N1t03, Coo, CLLO, Nb2O5, Z
By adding and blending the basic composition at the time of pulverization in the form of a composite addition of at least one type of r0z, M++-ZTI ferrite has a remarkable effect on increasing density, reducing core loss, and improving magnetic properties. I understand.
以下余白Below margin
Claims (1)
珪酸塩の１種０．００５ｗｔ％〜０．２ｗｔ％と、Ｓｉ
Ｏ＿２０．００１ｗｔ％〜０．２ｗｔ％、Ｖ＿２Ｏ＿５
０．０１ｗｔ％〜２ｗｔ％、 Ａｌ＿２Ｏ＿３０．０１ｗｔ％〜２ｗｔ％、ＣｏＯ０．
０１ｗｔ％〜２ｗｔ％、 ＣｕＯ０．０１ｗｔ％〜０．２ｗｔ％、 Ｎｂ＿２Ｏ＿５０．０１ｗｔ％〜０．２ｗｔ％、ＺｒＯ
＿２０．０１ｗｔ％〜０．２ｗｔ％のうち少なくとも１
種を、 上記基本組成の仮焼原料に配合添加し、微粉砕したのち
成型、焼結することを特徴とするＭｎ−Ｚｎ系フェライ
トの製造方法。[Claims] With respect to the basic composition consisting of Fe_2O_350 mol% to 70 mol%, MnO 10 to 40 mol%, Zn 5 to 30 mol%, CaO 0.01 wt% to 0.2 wt%, and an alkali metal, alkaline earth. 0.005 wt% to 0.2 wt% of metal or silicate of Zr or Al, and Si
O_20.001wt% ~ 0.2wt%, V_2O_5
0.01wt%~2wt%, Al_2O_30.01wt%~2wt%, CoO0.
01wt%~2wt%, CuO0.01wt%~0.2wt%, Nb_2O_50.01wt%~0.2wt%, ZrO
_At least 1 from 20.01wt% to 0.2wt%
A method for producing Mn-Zn ferrite, which comprises adding seeds to a calcined raw material having the above-mentioned basic composition, pulverizing the mixture, and then molding and sintering it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60097191A JPS61256967A (en) | 1985-05-08 | 1985-05-08 | Manufacture of mn-zn ferrite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60097191A JPS61256967A (en) | 1985-05-08 | 1985-05-08 | Manufacture of mn-zn ferrite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61256967A true JPS61256967A (en) | 1986-11-14 |
| JPH0238537B2 JPH0238537B2 (en) | 1990-08-30 |
Family
ID=14185687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60097191A Granted JPS61256967A (en) | 1985-05-08 | 1985-05-08 | Manufacture of mn-zn ferrite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61256967A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6351607A (en) * | 1986-08-21 | 1988-03-04 | Nippon Ferrite Ltd | Mn-zn ferrite |
| JPS63222018A (en) * | 1987-03-09 | 1988-09-14 | Taiyo Yuden Co Ltd | Ferrite composition |
| JPS63319254A (en) * | 1987-06-20 | 1988-12-27 | Tokin Corp | Oxide magnetic material generating low magnetic loss |
| JPH01143307A (en) * | 1987-11-30 | 1989-06-05 | Tokin Corp | Low-loss oxide magnetic material |
| JPH0254901A (en) * | 1988-08-19 | 1990-02-23 | Mitsubishi Electric Corp | Low-loss oxide magnetic material |
| JPH02124724A (en) * | 1988-11-02 | 1990-05-14 | Taiyo Yuden Co Ltd | Mn-zn ferrite material |
| EP0551907A2 (en) * | 1992-01-14 | 1993-07-21 | Matsushita Electric Industrial Co., Ltd. | An oxide magnetic material |
| WO2002081130A1 (en) * | 2001-04-02 | 2002-10-17 | Mitsubishi Materials Corporation | Composite soft magnetic sintered material having high density and high magnetic permeability and method for preparation thereof |
| EP1547988A1 (en) * | 2002-09-26 | 2005-06-29 | TDK Corporation | Ferrite material |
| JP2005272196A (en) * | 2004-03-24 | 2005-10-06 | Jfe Steel Kk | Manganese-cobalt-zinc-based ferrite |
| JP2005317924A (en) * | 2004-03-31 | 2005-11-10 | Neomax Co Ltd | Stacked inductor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0251726U (en) * | 1988-10-06 | 1990-04-12 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5950072A (en) * | 1982-09-11 | 1984-03-22 | 住友特殊金属株式会社 | Oxide magnetic material and manufacture |
-
1985
- 1985-05-08 JP JP60097191A patent/JPS61256967A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5950072A (en) * | 1982-09-11 | 1984-03-22 | 住友特殊金属株式会社 | Oxide magnetic material and manufacture |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6351607A (en) * | 1986-08-21 | 1988-03-04 | Nippon Ferrite Ltd | Mn-zn ferrite |
| JPS63222018A (en) * | 1987-03-09 | 1988-09-14 | Taiyo Yuden Co Ltd | Ferrite composition |
| JPS63319254A (en) * | 1987-06-20 | 1988-12-27 | Tokin Corp | Oxide magnetic material generating low magnetic loss |
| JPH0457628B2 (en) * | 1987-06-20 | 1992-09-14 | Tokin Corp | |
| JPH01143307A (en) * | 1987-11-30 | 1989-06-05 | Tokin Corp | Low-loss oxide magnetic material |
| JPH0254901A (en) * | 1988-08-19 | 1990-02-23 | Mitsubishi Electric Corp | Low-loss oxide magnetic material |
| JPH02124724A (en) * | 1988-11-02 | 1990-05-14 | Taiyo Yuden Co Ltd | Mn-zn ferrite material |
| EP0551907A3 (en) * | 1992-01-14 | 1994-07-13 | Matsushita Electric Ind Co Ltd | An oxide magnetic material |
| EP0551907A2 (en) * | 1992-01-14 | 1993-07-21 | Matsushita Electric Industrial Co., Ltd. | An oxide magnetic material |
| US5518642A (en) * | 1992-01-14 | 1996-05-21 | Matsushita Electric Industrial Co., Ltd. | Oxide magnetic material |
| EP0716053A2 (en) * | 1992-01-14 | 1996-06-12 | Matsushita Electric Industrial Co., Ltd. | An oxide magnetic material |
| EP0716053A3 (en) * | 1992-01-14 | 1996-07-03 | Matsushita Electric Ind Co Ltd | |
| WO2002081130A1 (en) * | 2001-04-02 | 2002-10-17 | Mitsubishi Materials Corporation | Composite soft magnetic sintered material having high density and high magnetic permeability and method for preparation thereof |
| WO2002081129A1 (en) * | 2001-04-02 | 2002-10-17 | Mitsubishi Materials Corporation | Composite soft magnetic sintered material having high density and high magnetic permeability and method for preparation thereof |
| US7371271B2 (en) | 2001-04-02 | 2008-05-13 | Mitsubishi Materials Pmg Corporation | Composite soft magnetic sintered material having high density and high magnetic permeability and method for preparation thereof |
| EP1547988A1 (en) * | 2002-09-26 | 2005-06-29 | TDK Corporation | Ferrite material |
| EP1547988A4 (en) * | 2002-09-26 | 2007-12-05 | Tdk Corp | Ferrite material |
| JP2005272196A (en) * | 2004-03-24 | 2005-10-06 | Jfe Steel Kk | Manganese-cobalt-zinc-based ferrite |
| JP2005317924A (en) * | 2004-03-31 | 2005-11-10 | Neomax Co Ltd | Stacked inductor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0238537B2 (en) | 1990-08-30 |
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