JPH05198416A - Mn-zn based ferrite - Google Patents
Mn-zn based ferriteInfo
- Publication number
- JPH05198416A JPH05198416A JP4010123A JP1012392A JPH05198416A JP H05198416 A JPH05198416 A JP H05198416A JP 4010123 A JP4010123 A JP 4010123A JP 1012392 A JP1012392 A JP 1012392A JP H05198416 A JPH05198416 A JP H05198416A
- Authority
- JP
- Japan
- Prior art keywords
- oxide
- weight
- added
- loss
- sic
- 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.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/342—Oxides
- H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、主としてスイッチング
電源用トランス等の磁心の用途に供して好適な、電力損
失の少ないＭｎ−Ｚｎ系フェライトに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Mn-Zn type ferrite having a small power loss, which is suitable for use mainly in magnetic cores such as transformers for switching power supplies.
【０００２】[0002]
【従来の技術】Ｍｎ−Ｚｎ系酸化物磁性材料いわゆるＭ
ｎ−Ｚｎ系フェライトは、各種通信機器、電源等の、コ
ア、トランス材として広く用いられているが、最近のＯ
Ａ（オフィスオートメーション），ＦＡ（ファクトリー
オートメーション）機器の普及により、約１００ｋＨｚ
の高周波域で動作するスイッチング電源のトランス材料
としても使用されている。2. Description of the Related Art Mn--Zn oxide magnetic material, so-called M
The n-Zn ferrite is widely used as a core and a transformer material for various communication devices, power supplies, etc.
Approximately 100 kHz due to the spread of A (office automation) and FA (factory automation) equipment
It is also used as a transformer material for switching power supplies that operate in the high frequency range.
【０００３】かかるトランス材料として使用されるＭｎ
−Ｚｎ系フェライトに要求される特性としては、高飽和
磁束密度、高透磁率および低鉄損など種々の特性が挙げ
られるが、特に本発明で対象とするようなスイッチング
電源用トランスについては、高磁場下において低損失で
あることがとりわけ重要とされる。このためＭｎ−Ｚｎ
系フェライトにおいては、従来から種々の微量成分を添
加することによってその改善が試みられている。Mn used as such a transformer material
Various characteristics such as a high saturation magnetic flux density, a high magnetic permeability and a low iron loss can be mentioned as the characteristics required for the -Zn-based ferrite. Particularly, the characteristics of the switching power supply transformer targeted by the present invention are high. Low loss under magnetic fields is of particular importance. Therefore, Mn-Zn
In ferrites, it has been attempted to improve them by adding various trace components.
【０００４】例えば特開昭５８−１１４４０１号公報で
は、ＣａＯ，Ｎｂ2 Ｏ5 およびＳｉＯ2 の添加により、
また特開昭６０−１３２３０２号公報ではＣａＯおよび
ＳｎＯ2 に加えて、ＳｉＯ2 ，Ｖ2 Ｏ5 ，Ａｌ2 Ｏ3 ，
Ｎｂ2 Ｏ5 ，ＣｏＯ，ＣｕＯ，ＺｒＯ2 等の添加によ
り、現在スイッチング周波数として多く使用されている
１００ｋＨｚにおける損失の改善を図っており、１００
ｋＨｚ，２００ｍＴにおける電力損失が３００〜３５０
ｍＷ／ｃｍ3 程度のレベルまで実現されている。For example, in Japanese Patent Laid-Open No. 58-114401, the addition of CaO, Nb 2 O 5 and SiO 2
In addition, in JP-A-60-132302, in addition to CaO and SnO 2 , SiO 2 , V 2 O 5 , Al 2 O 3 ,
By adding Nb 2 O 5 , CoO, CuO, ZrO 2, etc., the loss at 100 kHz, which is widely used as a switching frequency at present, is improved.
Power loss at kHz, 200 mT is 300-350
It has been realized up to the level of mW / cm 3 .
【０００５】[0005]
【発明が解決しようとする課題】本発明は、前記に引用
した２件の特許に限らず、各種添加物の組合せにより、
低損失化を目標とした数多くの試みがなされているにも
拘らず、限界となっていた１００ｋＨｚ，２００ｍＴの
電力損失を更に改善し、主としてスイッチング電源用ト
ランスとして使用した場合において、損失を大幅に低減
することができる低損失Ｍｎ−Ｚｎ系フェライトを提案
することを目的とする。The present invention is not limited to the two patents cited above, but can be obtained by combining various additives.
Despite many attempts aimed at lowering the loss, the power loss of 100 kHz and 200 mT, which was the limit, was further improved, and the loss was drastically reduced when used mainly as a transformer for switching power supply. It is an object to propose a low-loss Mn-Zn-based ferrite that can be reduced.
【０００６】[0006]
【課題を解決するための手段】すなわち本発明は、 Ｆｅ2 Ｏ3 ：５２．０〜５４．７ｍｏｌ％ ＭｎＯ： ３１〜４０ｍｏｌ％ ＺｎＯ： ６〜１５ｍｏｌ％ からなる基本成分中に ＳｉＣ：０．００１〜０．０３０重量％ ＣａＯ：０．０２〜０．３０重量％ に加えて 酸化ニオブ：０．０１〜０．０８重量％ 酸化チタン：０．０５〜０．４０重量％ 酸化アンチモン：０．００５〜０．０８重量％ 酸化タンタル：０．０２〜０．１５重量％ 酸化バナジウム：０．００５〜０．２０重量％ 酸化ジルコニウム：０．０２〜０．１５重量％ 酸化スズ：０．０２〜０．５０重量％ 酸化アルミニウム：０．０１〜０．５０重量％ 酸化コバルト：０．０１〜１．０重量％ 酸化銅：０．０２〜０．１５重量％ 酸化ハフニウム：０．０５〜１．０重量％ 酸化シリコン：０．００１〜０．０３０重量％ のうちの一種以上を含有することを特徴とするＭｎ−Ｚ
ｎ系フェライトである。[Means for Solving the Problems] That is, according to the present invention, in a basic component consisting of Fe 2 O 3 : 52.0 to 54.7 mol% MnO: 31 to 40 mol% ZnO: 6 to 15 mol%, SiC: 0.001 In addition to 0.030 wt% CaO: 0.02 to 0.30 wt% Niobium oxide: 0.01 to 0.08 wt% Titanium oxide: 0.05 to 0.40 wt% Antimony oxide: 0.005 -0.08 wt% Tantalum oxide: 0.02-0.15 wt% Vanadium oxide: 0.005-0.20 wt% Zirconium oxide: 0.02-0.15 wt% Tin oxide: 0.02-0 .50 wt% Aluminum oxide: 0.01 to 0.50 wt% Cobalt oxide: 0.01 to 1.0 wt% Copper oxide: 0.02 to 0.15 wt% Hafnium oxide: 0.05 to 1.0 Wt% oxidation Recon: 0.001 to 0.030, characterized in that it contains one or more of the weight% Mn-Z
It is an n-type ferrite.
【０００７】[0007]
【作用】まず本発明において、基本成分の割合を Ｆｅ2 Ｏ3 ：５２．０〜５４．７ｍｏｌ％、 ＭｎＯ： ３１〜４０ｍｏｌ％ 及び ＺｎＯ： ６〜１５ｍｏｌ％ の範囲に限定した理由について説明する。[Action] First, in the present invention, the basic components of the proportion of Fe 2 O 3: 52.0~54.7mol%, MnO: 31~40mol% and ZnO: the reasons for limiting the scope of 6～15Mol% will be described.
【０００８】スイッチング電源用トランスの動作温度
は、通常６０〜７０℃であり、従ってこの温度範囲で電
力損失が低く、かつ低温から動作温度を超える８０〜１
２０℃程度の温度域まで鉄損が負の温度依存性を持つこ
とが望ましい。また、本発明の材料はスイッチング電源
用トランスへの適用に限定されるものではなく高飽和磁
束密度を有し、かつ低損失であることが要求されるフラ
イバックトランス等への使用も可能であり、これらの観
点からＦｅ2 Ｏ3 ，ＭｎＯおよびＺｎＯの割合を検討し
た結果、上記の範囲が得られたのである。The operating temperature of the transformer for the switching power supply is usually 60 to 70 ° C. Therefore, power loss is low in this temperature range, and 80 to 1 which exceeds the operating temperature from low temperature.
It is desirable that the iron loss has a negative temperature dependency up to a temperature range of about 20 ° C. Further, the material of the present invention is not limited to application to a transformer for a switching power supply, but can be used for a flyback transformer or the like which has a high saturation magnetic flux density and requires low loss. As a result of examining the proportions of Fe 2 O 3 , MnO and ZnO from these viewpoints, the above range was obtained.
【０００９】そして本発明では、上述した主要成分中に
ＳｉＣおよびＣａＯを加え、さらに種々の微量酸化物の
うちの一種以上を含有させるところに特徴がある。本発
明者らは鉄損低減を目的とした微量成分添加の従来技術
においては、添加成分の形態はほとんどの場合酸化物で
あり、例外的にフッ化物や各種酸塩等があるに過ぎない
ことに鑑み、各種非酸化物形態の添加物について数多く
の実験を積み重ねた結果本発明を完成させたものであ
る。The present invention is characterized in that SiC and CaO are added to the above-mentioned main components and that one or more kinds of various trace oxides are further contained. In the prior art of adding a minor component for the purpose of reducing iron loss, the present inventors have found that the form of the additive component is almost always an oxide, and there are exceptionally only fluorides and various acid salts. In view of the above, the present invention has been completed as a result of numerous experiments conducted on various non-oxide type additives.
【００１０】ＳｉＣの添加によってＭｎ−Ｚｎ系フェラ
イトの高周波下での鉄損が著しく改善されることが認め
られる。その理由は現時点では十分明らかになっている
訳ではないが、ＣａＯとの共存によって粒界の比抵抗を
高め、渦電流損の低減に有効に寄与していることも一因
となっている。ＳｉＣの含有量は０．００１重量％に満
たないとその添加効果に乏しく、一方０．０３０重量％
を越えると焼成時に異常粒成長が起こりやすく、特性が
不安定になるので０．００１〜０．０３０重量％の範囲
に限定した。It is recognized that the addition of SiC significantly improves the iron loss of Mn-Zn ferrite at high frequencies. The reason for this is not clear at the present time, but it is partly due to the fact that coexistence with CaO increases the specific resistance of the grain boundary and effectively contributes to the reduction of eddy current loss. If the content of SiC is less than 0.001% by weight, its effect is poor, while 0.030% by weight
If it exceeds 1.0%, abnormal grain growth is likely to occur during firing, and the characteristics become unstable. Therefore, the range is set to 0.001 to 0.030% by weight.
【００１１】ＣａＯはＳｉＣとの共存下で効果的に粒界
抵抗を高め、もって低損失をもたらす有用成分である
が、含有量が０．０２重量％に満たないと粒界抵抗の向
上効果に乏しく、一方０．３０重量％を超えると逆に損
失が大きくなるので０．０２〜０．３０重量％の範囲で
添加するものとした。本発明においては、ＳｉＣを微量
添加することを最も顕著な特徴とするが、更に酸化ニオ
ブ（主としてＮｂ2 Ｏ5 ）、酸化チタン（主としてＴｉ
Ｏ2 ）、酸化アンチモン（主としてＳｂ2 Ｏ3 ）、酸化
タンタル（主としてＴａ2 Ｏ5 ）、酸化バナジウム（主
としてＶ2 Ｏ5 ）、酸化ジルコニウム（主としてＺｒＯ
2 ）、酸化スズ（主としてＳｎＯ2 ）、酸化アルミニウ
ム（主としてＡｌ2 Ｏ3 ）、酸化コバルト（主としてＣ
ｏＯ）、酸化銅（主としてＣｕＯ）、酸化ハフニウム
（主としてＨｆＯ2 ）、酸化シリコン（主としてＳｉＯ
2 ）のうち１種以上含有させることにより、鉄損の低減
に著しい効果が得られるが、Ｎｂ2 Ｏ5 ：０．０１重量
％未満、ＴｉＯ2 ：０．０５重量％未満、Ｓｂ2 Ｏ3 ：
０．００５重量％未満、Ｔａ2 Ｏ5 ：０．０２重量％未
満、Ｖ2 Ｏ5 ：０．００５重量％未満、ＺｒＯ2 ：０．
０２重量％未満、ＳｎＯ2 ：０．０２重量％未満、Ａｌ
2 Ｏ3 ：０．０１重量％未満、ＣｏＯ：０．０１重量％
未満、ＣｕＯ：０．０２重量％未満、ＨｆＯ2 ：０．０
５重量％未満、ＳｉＯ2 ：０．００１重量％未満の添加
では多くの場合、渦電流損失の低減が小さく、添加効果
が十分発揮されない。CaO is a useful component that effectively enhances the grain boundary resistance in the presence of SiC and thus brings about a low loss, but if the content is less than 0.02% by weight, it has the effect of improving the grain boundary resistance. On the other hand, if it exceeds 0.30% by weight, on the other hand, the loss becomes large, so the addition amount was made 0.02 to 0.30% by weight. In the present invention, the most prominent feature is the addition of a small amount of SiC, but niobium oxide (mainly Nb 2 O 5 ) and titanium oxide (mainly Ti
O 2 ), antimony oxide (mainly Sb 2 O 3 ), tantalum oxide (mainly Ta 2 O 5 ), vanadium oxide (mainly V 2 O 5 ), zirconium oxide (mainly ZrO 2 ).
2 ), tin oxide (mainly SnO 2 ), aluminum oxide (mainly Al 2 O 3 ), cobalt oxide (mainly C
oO), copper oxide (mainly CuO), hafnium oxide (mainly HfO 2 ), silicon oxide (mainly SiO)
By containing one or more of 2 ), a remarkable effect in reducing iron loss can be obtained, but Nb 2 O 5 : less than 0.01% by weight, TiO 2 : less than 0.05% by weight, Sb 2 O 3 :
Less than 0.005% by weight, Ta 2 O 5 : less than 0.02% by weight, V 2 O 5 : less than 0.005% by weight, ZrO 2 : 0.
Less than 02 wt%, SnO 2 : less than 0.02 wt%, Al
2 O 3 : less than 0.01% by weight, CoO: 0.01% by weight
Less than, CuO: less than 0.02% by weight, HfO 2 : 0.0
Addition of less than 5% by weight or SiO 2 : less than 0.001% by weight often causes little reduction in eddy current loss, and the addition effect is not sufficiently exhibited.
【００１２】またＮｂ2 Ｏ5 ：０．０８重量％、ＴｉＯ
2 ：０．４０重量％、Ｓｂ2 Ｏ3 ：０．０８重量％、Ｔ
ａ2 Ｏ5 ：０．１５重量％、Ｖ2 Ｏ5 ：０．２０重量
％、ＺｒＯ2 ：０．１５重量％、ＳｎＯ2 ：０．５０重
量％、Ａｌ2 Ｏ3 ：０．５０重量％、ＣｏＯ：１．０重
量％、ＣｕＯ：０．１５重量％、ＨｆＯ2 ：１．０重量
％、ＳｉＯ2 ：０．０３０重量％を越えて添加すると主
として焼成中に異常粒成長が起こり、履歴損および渦電
流損共に増大してしまうために、各添加物について上記
で示した下限値および上限値の範囲内で添加されなけれ
ばならない。Nb 2 O 5 : 0.08% by weight, TiO 2
2 : 0.40% by weight, Sb 2 O 3 : 0.08% by weight, T
a 2 O 5: 0.15 wt%, V 2 O 5: 0.20 wt%, ZrO 2: 0.15 wt%, SnO 2: 0.50 wt%, Al 2 O 3: 0.50 wt% , CoO: 1.0% by weight, CuO: 0.15% by weight, HfO 2 : 1.0% by weight, SiO 2 : 0.030% by weight, abnormal grain growth mainly occurs during firing, In order to increase both the loss and the eddy current loss, each additive must be added within the range of the lower limit value and the upper limit value shown above.
【００１３】ＳｉＣ以外の添加物については、原料の仮
焼又は焼成中に容易に酸化物に変化するものであれば、
添加物の化学形態は問わない。本発明によるフェライト
を製造するにあたっては原料、混合−仮焼−粉砕−造粒
−成形−焼成の常法の工程に従って処理を施せばよい。
微量添加成分の添加時期は原料混合または粉砕時に行え
ばよい。With respect to the additives other than SiC, as long as they are easily converted into oxides during calcination or firing of the raw materials,
The chemical form of the additive does not matter. In producing the ferrite according to the present invention, treatment may be carried out in accordance with the usual steps of raw materials, mixing-calcination-pulverization-granulation-molding-firing.
The minute addition component may be added at the time of mixing the raw materials or crushing.
【００１４】本発明の効果を以下に実施例をもって具体
的に説明する。The effects of the present invention will be specifically described below with reference to examples.
【００１５】[0015]
【実施例】最終組成としてＦｅ2 Ｏ3 ：５３．１ｍｏｌ
％、ＭｎＯ：３５．５ｍｏｌ％、ＺｎＯ：１１．４ｍｏ
ｌ％となる基本組成の原料を混合した後、大気中で９５
０℃で仮焼を施した。この仮焼粉に対し、表１〜表４に
示す割合で、本発明に含まれる範囲および本発明から外
れる範囲の添加成分を添加配合し、同時に湿式ボールミ
ルで粉砕・混合した。ついで粉砕粉にバインダーとして
ＰＶＡを添加し、造粒した後外径３６ｍｍ、内径２４ｍ
ｍ、厚さ１２ｍｍのトロイダル形状に成形した後、酸素
分圧を制御した窒素雰囲気中で１３３０℃で焼成を行っ
た。かくして得られた焼成コアの、周波数１００ｋＨ
ｚ、最大磁束密度２００ｍＴ、温度１００℃における鉄
損値を交流ＢＨループトレーサーによって測定した結果
を表１、表２、表３、表４に併記する。Example: Fe 2 O 3 as final composition: 53.1 mol
%, MnO: 35.5 mol%, ZnO: 11.4 mo
After mixing the raw materials with the basic composition of 1%,
It was calcined at 0 ° C. To this calcined powder, the additive components in the range included in the present invention and the range deviating from the present invention were added and blended in the proportions shown in Tables 1 to 4, and simultaneously pulverized and mixed by a wet ball mill. Next, PVA was added as a binder to the pulverized powder, and after granulation, the outer diameter was 36 mm and the inner diameter was 24 m.
After being formed into a toroidal shape having a thickness of m and a thickness of 12 mm, firing was performed at 1330 ° C. in a nitrogen atmosphere with a controlled oxygen partial pressure. The frequency of the thus obtained fired core is 100 kHz.
Table 1, Table 2, Table 3, and Table 4 also show the results of measuring the iron loss value at z, maximum magnetic flux density of 200 mT, and temperature of 100 ° C. by an AC BH loop tracer.
【００１６】表１、表２、表３、表４から明らかなよう
に、本発明に従って副成分を添加含有させたものはいず
れも３００ｍＷ／ｃｍ3 を下回る、低い電力損失が達成
されている。これに対しこの本発明の適正範囲から外れ
たものはいずれも損失の改善効果に乏しく、甚しい場合
には異常粒成長によって損失特性は著しく劣っている。As is clear from Table 1, Table 2, Table 3 and Table 4, all of the compositions containing the auxiliary component added according to the present invention have achieved a low power loss of less than 300 mW / cm 3 . On the other hand, all of those outside the proper range of the present invention have a poor loss improving effect, and in extreme cases, the loss characteristics are remarkably inferior due to abnormal grain growth.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【表２】 [Table 2]
【００１９】[0019]
【表３】 [Table 3]
【００２０】[0020]
【表４】 [Table 4]
【００２１】[0021]
【発明の効果】本発明によれば、スイッチング電源を始
めとする各種高周波電源のトランスコアとして、従来の
材料と比較して損失が格段に小さいＭｎ−Ｚｎ系フェラ
イトを得ることができる。According to the present invention, as a transformer core for various high frequency power supplies such as a switching power supply, Mn-Zn type ferrite having a much smaller loss than conventional materials can be obtained.
Claims (1)
％ ＭｎＯ： ３１〜４０ｍｏｌ％ ＺｎＯ： ６〜１５ｍｏｌ％ からなる基本成分中に ＳｉＣ：０．００１〜０．０３０重量％ ＣａＯ：０．０２〜０．３０重量％ に加えて 酸化ニオブ：０．０１〜０．０８重量％ 酸化チタン：０．０５〜０．４０重量％ 酸化アンチモン：０．００５〜０．０８重量％ 酸化タンタル：０．０２〜０．１５重量％ 酸化バナジウム：０．００５〜０．２０重量％ 酸化ジルコニウム：０．０２〜０．１５重量％ 酸化スズ：０．０２〜０．５０重量％ 酸化アルミニウム：０．０１〜０．５０重量％ 酸化コバルト：０．０１〜１．０重量％ 酸化銅：０．０２〜０．１５重量％ 酸化ハフニウム：０．０５〜１．０重量％ 酸化シリコン：０．００１〜０．０３０重量％ のうちの一種以上を含有することを特徴とするＭｎ−Ｚ
ｎ系フェライト。1. Fe 2 O 3 : 52.0 to 54.7 mol
% MnO: 31-40 mol% ZnO: 6-15 mol% In addition to SiC: 0.001-0.030 wt% CaO: 0.02-0.30 wt% Niobium oxide: 0.01 -0.08 wt% Titanium oxide: 0.05-0.40 wt% Antimony oxide: 0.005-0.08 wt% Tantalum oxide: 0.02-0.15 wt% Vanadium oxide: 0.005-0 20% by weight Zirconium oxide: 0.02 to 0.15% by weight Tin oxide: 0.02 to 0.50% by weight Aluminum oxide: 0.01 to 0.50% by weight Cobalt oxide: 0.01 to 1.0 % By weight Copper oxide: 0.02-0.15% by weight Hafnium oxide: 0.05-1.0% by weight Silicon oxide: 0.001-0.030% by weight To M -Z
n-type ferrite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4010123A JPH05198416A (en) | 1992-01-23 | 1992-01-23 | Mn-zn based ferrite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4010123A JPH05198416A (en) | 1992-01-23 | 1992-01-23 | Mn-zn based ferrite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05198416A true JPH05198416A (en) | 1993-08-06 |
Family
ID=11741521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4010123A Pending JPH05198416A (en) | 1992-01-23 | 1992-01-23 | Mn-zn based ferrite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05198416A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995029491A1 (en) * | 1994-04-27 | 1995-11-02 | Tdk Corporation | Ferrite and ferrite core for power source |
| US6627103B2 (en) | 2000-03-31 | 2003-09-30 | Tdk Corporation | Mn-Zn ferrite production process, Mn-Zn ferrite, and ferrite core for power supplies |
| JP2006303522A (en) * | 1994-11-07 | 2006-11-02 | Jfe Chemical Corp | Mn-Zn-Co SYSTEM FERRITE IRON CORE MATERIAL |
| JP2007311387A (en) * | 2006-05-16 | 2007-11-29 | Nec Tokin Corp | Oxide magnetic material |
| CN104051110A (en) * | 2014-06-24 | 2014-09-17 | 铜陵三佳变压器有限责任公司 | Cobalt-based ferrite core materials |
| CN104064311A (en) * | 2014-06-24 | 2014-09-24 | 安徽皖宏电气设备有限公司 | Silicon carbide-based ferrite magnetic core material for transformer |
| WO2018181242A1 (en) | 2017-03-28 | 2018-10-04 | 日立金属株式会社 | MnZn-BASED FERRITE SINTERED BODY |
| CN112299836A (en) * | 2020-11-25 | 2021-02-02 | 南通冠优达磁业有限公司 | High-frequency low-loss soft magnetic ferrite material and preparation method thereof |
-
1992
- 1992-01-23 JP JP4010123A patent/JPH05198416A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995029491A1 (en) * | 1994-04-27 | 1995-11-02 | Tdk Corporation | Ferrite and ferrite core for power source |
| JP2006303522A (en) * | 1994-11-07 | 2006-11-02 | Jfe Chemical Corp | Mn-Zn-Co SYSTEM FERRITE IRON CORE MATERIAL |
| US6627103B2 (en) | 2000-03-31 | 2003-09-30 | Tdk Corporation | Mn-Zn ferrite production process, Mn-Zn ferrite, and ferrite core for power supplies |
| JP2007311387A (en) * | 2006-05-16 | 2007-11-29 | Nec Tokin Corp | Oxide magnetic material |
| CN104051110A (en) * | 2014-06-24 | 2014-09-17 | 铜陵三佳变压器有限责任公司 | Cobalt-based ferrite core materials |
| CN104064311A (en) * | 2014-06-24 | 2014-09-24 | 安徽皖宏电气设备有限公司 | Silicon carbide-based ferrite magnetic core material for transformer |
| WO2018181242A1 (en) | 2017-03-28 | 2018-10-04 | 日立金属株式会社 | MnZn-BASED FERRITE SINTERED BODY |
| EP3594193A4 (en) * | 2017-03-28 | 2020-01-15 | Hitachi Metals, Ltd. | MnZn-BASED FERRITE SINTERED BODY |
| TWI771395B (en) * | 2017-03-28 | 2022-07-21 | 日商日立金屬股份有限公司 | Manganese-zinc ferrite sintered body |
| US11398328B2 (en) | 2017-03-28 | 2022-07-26 | Hitachi Metals, Ltd. | Sintered MnZn ferrite body |
| CN112299836A (en) * | 2020-11-25 | 2021-02-02 | 南通冠优达磁业有限公司 | High-frequency low-loss soft magnetic ferrite material and preparation method thereof |
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