JP3739849B2 - Low-loss oxide magnetic material - Google Patents
Low-loss oxide magnetic material Download PDFInfo
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- JP3739849B2 JP3739849B2 JP03784096A JP3784096A JP3739849B2 JP 3739849 B2 JP3739849 B2 JP 3739849B2 JP 03784096 A JP03784096 A JP 03784096A JP 3784096 A JP3784096 A JP 3784096A JP 3739849 B2 JP3739849 B2 JP 3739849B2
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- 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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Description
【０００１】
【発明の属する技術分野】
本発明はスイッチング電源用トランスやチョークコイル等の磁心として使用する低損失酸化物磁性材料に関するもので、特に高周波領域で使用される低損失酸化物磁性材料に関するものである。
【０００２】
【従来の技術】
従来、スイッチング電源用トランスやチョークコイル等の磁心として使用される磁性材料としては一般にＭｎ−Ｚｎ系フェライト材が用いられてきた。
【０００３】
しかし、エレクトロニクス製品は常に小型化、軽量化、高性能化が望まれており、それに伴ってエレクトロニクス製品に使用される酸化物磁性材料もこれらの要求を満足させるため、動作周波数の高周波化が要求され、高周波領域で使用可能な低損失酸化物磁性材料の開発が急務となっていた。
【０００４】
ここで、Ｍｎ−Ｚｎ系フェライト材は比抵抗が小さいため高周波領域では渦電流損失が増大する。即ち、Ｍｎ−Ｚｎ系フェライト材は図７の鉄損の周波数特性（ｆ・Ｂｍ積：２５ｋＴＨｚ）を示すグラフからわかるように、高周波領域における鉄損が大きいため実用には適さない。ここで、ｆ・Ｂｍ積とは磁心の電力伝送状態を示す値であって、使用周波数とそのときの磁束密度の積で表す。
【０００５】
また、比抵抗が大きいＮｉ−Ｚｎ系フェライト材は渦電流損失は小さいが、ヒステリシス損失が大きく、前記Ｍｎ−Ｚｎ系フェライト材と同様に実用には至っていない。
【０００６】
そこで、高周波領域においても低損失な低損失酸化物磁性材料として特開平４ー３３７６０５号公報が提案されている。
【０００７】
これはＦｅ，Ｚｎ，Ｎｉ，Ｃｕを適当に混合させて生成焼結させた低損失酸化物磁性材料であり、Ｎｉ−Ｚｎ系フェライト材でありながらヒステリシス損失を比較的小さくすることが可能で、２ＭＨｚの高周波領域であっても３７０〜５００ｋｗ／ｍ3（２０ｍＴ）を達成している。
【０００８】
【発明が解決しようとする課題】
現在、エレクトロニクス製品は小型、軽量化即ち軽薄短小化の波に追われ、高周波領域にあっても低損失な酸化物磁性材料の開発が求められている。そのような環境の中から２ＭＨｚの高周波領域にて３７０〜５００ｋｗ／ｍ3（２０ｍＴ）の低損失を可能としたものが提案されているが、スイッチング電源用トランスやチョークコイル等の磁心として使用される磁性材料はできるだけ小さいことが望ましく、電源回路の小型化のため更なる高周波領域での低損失化が求められている。
【０００９】
そこで、本発明は２ＭＨｚ以上の高周波領域においても低損失で、スイッチング電源用トランスやチョークコイル等の磁心として適切な高周波用低損失酸化物磁性材料を提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明は、酸化物換算で、Ｆｅ ２ Ｏ ３ を４７ｍｏｌ％、ＮｉＯを２０ｍｏｌ％、ＣｕＯを９ｍｏｌ％、ＺｎＯを２４ｍｏｌ％の組成比で含有し、添加物として、ＣｏＯを０．１〜２．４ｗｔ％の範囲で含有するスイッチング電源用トランスの磁心用低損失酸化物磁性材料を提供する。
また、本発明は、酸化物換算で、Ｆｅ ２ Ｏ ３ を４７ｍｏｌ％、ＮｉＯを２０ｍｏｌ％、ＣｕＯを９ｍｏｌ％、ＺｎＯを２４ｍｏｌ％の組成比で含有し、添加物として、ＣｏＯを０．１〜２．４ｗｔ％の範囲で含有するチョークコイルの磁心用低損失酸化物磁性材料を提供する。
更に本発明は、酸化物換算で、Ｆｅ ２ Ｏ ３ を４７ｍｏｌ％、ＮｉＯを９〜３１ｍｏｌ％、ＣｕＯを１５ｍｏｌ％、残部をＺｎＯの組成比で含有し、添加物として、ＣｏＯを０．５ｗｔ％の範囲で含有するスイッチング電源用トランスの磁心用低損失酸化物磁性材料を提供する。
また、本発明は、酸化物換算で、Ｆｅ ２ Ｏ ３ を４７ｍｏｌ％、ＮｉＯを９〜３１ｍｏｌ％、ＣｕＯを１５ｍｏｌ％、残部をＺｎＯの組成比で含有し、添加物として、ＣｏＯを０．５ｗｔ％の範囲で含有するチョークコイルの磁心用低損失酸化物磁性材料を提供する。
また、本発明は、酸化物換算で、Ｆｅ ２ Ｏ ３ を４７ｍｏｌ％、ＮｉＯを１７ｍｏｌ％、ＣｕＯを６〜２０ｍｏｌ％、残部をＺｎＯの組成比で含有し、添加物として、ＣｏＯを０．５ｗｔ％の範囲で含有するスイッチング電源用トランスの磁心用低損失酸化物磁性材料を提供する。
また、本発明は、酸化物換算で、Ｆｅ ２ Ｏ ３ を４７ｍｏｌ％、ＮｉＯを１７ｍｏｌ％、ＣｕＯを６〜２０ｍｏｌ％、残部をＺｎＯの組成比で含有し、
添加物として、ＣｏＯを０．５ｗｔ％の範囲で含有するチョークコイルの磁心用低損失酸化物磁性材料を提供する。
また、本発明は、酸化物換算で、Ｆｅ ２ Ｏ ３ を４５．５〜４９ｍｏｌ％、ＣｕＯを１５ｍｏｌ％、ＺｎＯを１８ｍｏｌ％、残部をＮｉＯの組成比で含有し、添加物として、ＣｏＯを０．５ｗｔ％の範囲で含有するスイッチング電源用トランスの磁心用低損失酸化物磁性材料を提供する。
また、本発明は、酸化物換算で、Ｆｅ ２ Ｏ ３ を４５．５〜４９ｍｏｌ％、ＣｕＯを１５ｍｏｌ％、ＺｎＯを１８ｍｏｌ％、残部をＮｉＯの組成比で含有し、添加物として、ＣｏＯを０．５ｗｔ％の範囲で含有するチョークコイルの磁心用低損失酸化物磁性材料を提供する。
上記発明によれば、２ＭＨｚ以上の高周波においても低損失で、スイッチング電源用トランスやチョークコイル等の磁心として適切な低損失酸化物磁性材料が提供される。
【００１１】
【発明の実施の形態】
Ｆｅ2Ｏ3、ＮｉＯ、ＣｕＯ、ＺｎＯ、ＣｏＯを湿式ボールミルにて５時間混合した後、乾燥させた。次に、８００℃にて２時間仮焼成を行った後、湿式ボールミルにて２０時間粉砕し、乾燥させた後バインダーを加えて造粒した。これをトロイダル形状に１ｔｏｎ／ｃｍ3にて加圧成型し、９９０〜１０００℃で２時間焼成し図１に示すような組成ごとの含有量をもつ焼結酸化物磁性材料であるトロイダルコアを得た。
【００１２】
ここで、得られた焼結酸化物磁性材料であるトロイダルコアについてＢ−Ｈアナライザーにより５ＭＨｚ，５ｍＴにて鉄損（Ｐｃｖ）を測定した。
【００１３】
図２にＣｏＯの量を０〜３重量％変化させこのときの鉄損の値の変化を示す。
【００１４】
一般に、スイッチング電源用トランスやチョークコイル等の磁心の温度上昇は上昇分で４０〜５０℃以下が望ましいとされており、このときの鉄損の値は６０〜８０ｋｗ／ｍ3（ｆ・Ｂｍ積：２５ｋＴＨｚ）となる。
【００１５】
したがって、図２よりＣｏＯは０．１乃至２．４重量％の範囲で含有すれば、スイッチング電源用チョークコイル等の磁心として適切な高周波用低損失酸化物磁性材料となることがわかる。また、鉄損の値は４０ｋＷ／ｍ ３ 以下であることがより好ましいが、このような鉄損の値を得ることのできるＣｏＯの含有率は０．２重量％以上、１．７５重量％以下であることが図２よりわかる。
【００１６】
図３にＮｉＯの量を５〜３５ｍｏｌ％変化させこのときの鉄損の値の変化を示す。
【００１７】
図３よりＮｉＯは９乃至３１ｍｏｌ％の範囲で含有すれば、スイッチング電源用トランスやチョークコイル等の磁心として適切な高周波用低損失酸化物磁性材料となることがわかる。また、鉄損の値として前記４０ｋＷ／ｍ ３ 以下の値を得ることのできるＮｉＯの含有率は１３ｍｏｌ％以上、２８ｍｏｌ％以下であることが図３よりわかる。
【００１８】
図４にＣｕＯの量を５〜２１ｍｏｌ％変化させこのときの鉄損の値の変化を示す。
【００１９】
図４よりＣｕＯは６乃至２０ｍｏｌ％の範囲で含有すれば、スイッチング電源用トランスやチョークコイル等の磁心として適切な高周波用低損失酸化物磁性材料となることがわかる。また、鉄損の値として前記４０ｋＷ／ｍ ３ 以下の値を得ることのできるＣｕＯの含有率は７．５ｍｏｌ％以上、１８ｍｏｌ％以下であることが図４よりわかる。但し、本発明におけるＣｕＯの含有率の範囲は、特開平６−１２００２１号公報に開示のフェライトコアとの差異を明確にするために、８ｍｏｌ％より大で１８ｍｏｌ％以下に減縮する。
【００２０】
図５にＦｅ2Ｏ3の量を４５〜５０ｍｏｌ％変化させこのときの鉄損の値の変化を示す。
【００２１】
図５よりＦｅ２Ｏ３は４５．５乃至４９ｍｏｌ％の範囲で含有すれば、スイッチング電源用トランスやチョークコイル等の磁心として適切な高周波用低損失酸化物磁性材料となることがわかる。また、鉄損の値として前記４０ｋＷ／ｍ ３ 以下の値を得ることのできるＦｅ ２ Ｏ ３ の含有率は４６ｍｏｌ％以上、４８．５ｍｏｌ％未満であることが図５よりわかる。
【００２２】
さらに、組成物の配合量を図１のＮｏ．５に示す値に固定し周波数を変化させたときの鉄損の値の変化を図６に示す。ただし、このときのｆ・Ｂｍ積は２５ｋＴＨｚに固定することとする。
【００２３】
図６より周波数範囲２Ｍ〜２０ＭＨｚで鉄損は８０ｋｗ／ｍ3以下となり、高周波領域で使用されるスイッチング電源用トランスやチョークコイル等の磁心として適切な高周波用低損失酸化物磁性材料であることがわかる。
【００２４】
【発明の効果】
酸化物換算で、Ｆｅ2Ｏ3を４５．５乃至４９ｍｏｌ％、ＮｉＯを９乃至３１ｍｏｌ％、ＣｕＯを６乃至２０ｍｏｌ％、残部をＺｎＯの組成比で含有し、添加物として、ＣｏＯを０．１乃至２．４重量％の範囲で含有する酸化物磁性材料により、２ＭＨｚ以上の高周波にて使用できる、低損失なスイッチング電源用トランスやチョークコイル等の磁心を提供することが可能となった。
【図面の簡単な説明】
【図１】焼結酸化物磁性材料であるトロイダルコアの含有量を示す図表
【図２】ＣｏＯの量を変化させた場合の鉄損の変化を示すグラフ
【図３】ＮｉＯの量を変化させた場合の鉄損の変化を示すグラフ
【図４】ＣｕＯの量を変化させた場合の鉄損の変化を示すグラフ
【図５】Ｆｅ2Ｏ3の量を変化させた場合の鉄損の変化を示すグラフ
【図６】鉄損の周波数特性を示すグラフ
【図７】Ｍｎ−Ｚｎ系酸化物磁性材料の鉄損の周波数特性を示すグラフ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a low-loss oxide magnetic material used as a magnetic core for a switching power transformer, choke coil or the like, and more particularly to a low-loss oxide magnetic material used in a high frequency region.
[0002]
[Prior art]
Conventionally, as a magnetic material used as a magnetic core for a switching power transformer or choke coil, a Mn—Zn ferrite material has generally been used.
[0003]
However, electronic products are always required to be smaller, lighter, and higher in performance, and accordingly oxide magnetic materials used in electronic products also meet these requirements, and therefore require higher operating frequencies. Therefore, there has been an urgent need to develop a low-loss oxide magnetic material that can be used in a high-frequency region.
[0004]
Here, since the Mn—Zn ferrite material has a small specific resistance, eddy current loss increases in a high frequency region. That is, as can be seen from the graph showing the frequency characteristics of iron loss in FIG. 7 (f · Bm product: 25 kTHz), the Mn—Zn ferrite material is not suitable for practical use because the iron loss in the high frequency region is large. Here, the f · Bm product is a value indicating the power transmission state of the magnetic core, and is represented by the product of the operating frequency and the magnetic flux density at that time.
[0005]
In addition, Ni—Zn ferrite material having a large specific resistance has small eddy current loss but large hysteresis loss, and has not been put into practical use like the Mn—Zn ferrite material.
[0006]
In view of this, Japanese Patent Laid-Open No. 4-337605 has been proposed as a low-loss oxide magnetic material having a low loss even in a high-frequency region.
[0007]
This is a low-loss oxide magnetic material produced and sintered by appropriately mixing Fe, Zn, Ni, and Cu, and it is possible to relatively reduce hysteresis loss while being a Ni-Zn ferrite material. Even in the high frequency region of 2 MHz, 370 to 500 kw / m 3 (20 mT) is achieved.
[0008]
[Problems to be solved by the invention]
At present, electronic products are being pursued by the wave of miniaturization, weight reduction, that is, thinness and miniaturization, and there is a demand for the development of low-loss oxide magnetic materials even in the high frequency region. In such an environment, what has enabled a low loss of 370 to 500 kw / m 3 (20 mT) in a high frequency region of 2 MHz has been proposed, but it is used as a magnetic core for a switching power transformer or choke coil. It is desirable that the magnetic material to be as small as possible, and further reduction in loss in the high frequency region is required for miniaturization of the power supply circuit.
[0009]
SUMMARY OF THE INVENTION An object of the present invention is to provide a high-frequency low-loss oxide magnetic material that has low loss even in a high-frequency region of 2 MHz or higher and is suitable as a magnetic core for a switching power supply transformer, choke coil, or the like.
[0010]
[Means for Solving the Problems]
The present invention contains 47 mol% Fe 2 O 3 , 20 mol% NiO, 9 mol% CuO, and 24 mol% ZnO in terms of oxides, and CoO is added in an amount of 0.1-2. Provided is a low-loss oxide magnetic material for a magnetic core of a switching power supply transformer, which is contained in a range of 4 wt%.
Further, the present invention contains, in terms of oxide , 47 mol% Fe 2 O 3 , 20 mol% NiO, 9 mol% CuO, and 24 mol% ZnO, and contains 0.1 to 0.1 CoO as an additive. Provided is a low-loss oxide magnetic material for a magnetic core of a choke coil that is contained in a range of 2.4 wt%.
Furthermore, the present invention in terms of oxide, Fe 2 O 3 to 47mol%, 9~31mol% of NiO, 15 mol% of CuO, the balance being contained in the composition ratio of ZnO, as an additive, 0.5 wt% of CoO A low-loss oxide magnetic material for a magnetic core of a switching power supply transformer contained in the range of
Further, the present invention contains, in terms of oxide , 47 mol% Fe 2 O 3 , 9 to 31 mol% NiO, 15 mol% CuO, and the remaining ZnO in a composition ratio of ZnO, and 0.5 wt% of CoO as an additive. A low-loss oxide magnetic material for a magnetic core of a choke coil is provided.
Further, the present invention contains, in terms of oxide , 47 mol% Fe 2 O 3 , 17 mol% NiO, 6 to 20 mol% CuO, and the remainder in a composition ratio of ZnO, and 0.5 wt% of CoO as an additive. A low-loss oxide magnetic material for a magnetic core of a transformer for a switching power supply, contained in the range of%.
Further, the present invention is in terms of oxide, 47 mol% of Fe 2 O 3, 17mol% of NiO, 6~20mol% of CuO, containing the remainder in the composition ratio of ZnO,
As an additive, a low-loss oxide magnetic material for a magnetic core of a choke coil containing CoO in a range of 0.5 wt% is provided.
Further, the present invention is in terms of oxide, Fe 2 O 3 the 45.5~49mol%, 15mol% of CuO, ZnO and 18 mol%, the remainder was contained in the composition ratio of NiO, as an additive, the
Further, the present invention is in terms of oxide, Fe 2 O 3 the 45.5~49mol%, 15mol% of CuO, ZnO and 18 mol%, the remainder was contained in the composition ratio of NiO, as an additive, the
According to the above invention, a low-loss oxide magnetic material suitable for a magnetic core of a transformer for a switching power supply, a choke coil or the like is provided with a low loss even at a high frequency of 2 MHz or higher.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Fe 2 O 3 , NiO, CuO, ZnO, and CoO were mixed in a wet ball mill for 5 hours and then dried. Next, after calcination at 800 ° C. for 2 hours, the mixture was pulverized with a wet ball mill for 20 hours, dried, and then granulated with a binder. This is pressed into a toroidal shape at 1 ton / cm 3 and fired at 990 to 1000 ° C. for 2 hours to obtain a toroidal core which is a sintered oxide magnetic material having a content for each composition as shown in FIG. It was.
[0012]
Here, the iron loss (Pcv) of the obtained toroidal core, which is a sintered oxide magnetic material, was measured with a BH analyzer at 5 MHz and 5 mT.
[0013]
FIG. 2 shows the change in the value of iron loss when the amount of CoO is changed from 0 to 3% by weight.
[0014]
Generally, it is desirable that the temperature rise of the magnetic core of a transformer for a switching power supply, a choke coil, etc. is 40 to 50 ° C. or less, and the iron loss at this time is 60 to 80 kw / m 3 (f · Bm product). : 25 kTHz).
[0015]
Therefore, it can be seen from FIG. 2 that if CoO is contained in the range of 0.1 to 2.4% by weight, it becomes a high-frequency low-loss oxide magnetic material suitable as a magnetic core for a switching power supply choke coil or the like. Further, the iron loss value is more preferably 40 kW / m 3 or less, but the CoO content capable of obtaining such an iron loss value is 0.2 wt% or more and 1.75 wt% or less. It can be seen from FIG.
[0016]
FIG. 3 shows the change in the value of iron loss when the amount of NiO is changed by 5 to 35 mol%.
[0017]
FIG. 3 shows that when NiO is contained in the range of 9 to 31 mol%, it becomes a high-frequency low-loss oxide magnetic material suitable as a magnetic core for a switching power supply transformer or choke coil. Further, it can be seen from FIG. 3 that the content of NiO that can obtain the value of 40 kW / m 3 or less as the value of iron loss is 13 mol% or more and 28 mol% or less.
[0018]
FIG. 4 shows the change in the iron loss value when the amount of CuO is changed by 5 to 21 mol%.
[0019]
From FIG. 4, it can be seen that if CuO is contained in the range of 6 to 20 mol%, it becomes a high-frequency low-loss oxide magnetic material suitable as a magnetic core for a switching power transformer or choke coil. Moreover, it can be seen from FIG. 4 that the CuO content at which the iron loss value can be 40 kW / m 3 or less is 7.5 mol% or more and 18 mol% or less. However, the range of the CuO content in the present invention is reduced from 8 mol% to 18 mol% in order to clarify the difference from the ferrite core disclosed in JP-A-6-120021.
[0020]
FIG. 5 shows the change of the iron loss value when the amount of Fe 2 O 3 is changed by 45 to 50 mol%.
[0021]
FIG. 5 shows that when Fe 2 O 3 is contained in the range of 45.5 to 49 mol%, it becomes a high-frequency low-loss oxide magnetic material suitable as a magnetic core for a switching power transformer or choke coil. Moreover, it can be seen from FIG. 5 that the Fe 2 O 3 content at which the iron loss value can be 40 kW / m 3 or less is 46 mol% or more and less than 48.5 mol%.
[0022]
Further, the blending amount of the composition was changed to No. 1 in FIG. FIG. 6 shows a change in the iron loss value when the frequency is changed while being fixed to the value shown in FIG. However, the f · Bm product at this time is fixed at 25 kTHz.
[0023]
From FIG. 6, the iron loss is 80 kw / m 3 or less in the frequency range of 2 to 20 MHz, and it is a low-frequency oxide magnetic material suitable for high-frequency use as a magnetic core for a switching power transformer or choke coil used in a high-frequency range. Recognize.
[0024]
【The invention's effect】
In terms of oxide, it contains 45.5 to 49 mol% of Fe 2 O 3 , 9 to 31 mol% of NiO, 6 to 20 mol% of CuO, and the balance in the composition ratio of ZnO. The oxide magnetic material contained in the range of up to 2.4% by weight makes it possible to provide a magnetic core such as a low-loss transformer for a switching power supply or a choke coil that can be used at a high frequency of 2 MHz or higher.
[Brief description of the drawings]
FIG. 1 is a graph showing the content of a toroidal core that is a sintered oxide magnetic material. FIG. 2 is a graph showing changes in iron loss when the amount of CoO is changed. FIG. 3 is a graph showing changes in the amount of NiO. Fig. 4 is a graph showing a change in iron loss when the amount of CuO is changed. Fig. 5 is a graph showing a change in iron loss when the amount of CuO is changed. Fig. 5 is a change in iron loss when the amount of Fe 2 O 3 is changed. FIG. 6 is a graph showing the frequency characteristic of iron loss. FIG. 7 is a graph showing the frequency characteristic of iron loss of the Mn—Zn-based oxide magnetic material.
Claims (8)
ＦｅFe ２2 ＯO ３3 を４７ｍｏｌ％、47 mol%,
ＮｉＯを２０ｍｏｌ％、20 mol% NiO,
ＣｕＯを９ｍｏｌ％、9 mol% CuO,
ＺｎＯを２４ｍｏｌ％の組成比で含有し、Containing ZnO at a composition ratio of 24 mol%,
添加物として、As an additive
ＣｏＯを０．１〜２．４ｗｔ％0.1 to 2.4 wt% of CoO
の範囲で含有するスイッチング電源用トランスの磁心用低損失酸化物磁性材料。A low-loss oxide magnetic material for a magnetic core of a switching power supply transformer contained in the range of
ＦｅFe ２2 ＯO ３3 を４７ｍｏｌ％、47 mol%,
ＮｉＯを２０ｍｏｌ％、20 mol% NiO,
ＣｕＯを９ｍｏｌ％、9 mol% CuO,
ＺｎＯを２４ｍｏｌ％の組成比で含有し、Containing ZnO at a composition ratio of 24 mol%,
添加物として、As an additive
ＣｏＯを０．１〜２．４ｗｔ％0.1 to 2.4 wt% of CoO
の範囲で含有するチョークコイルの磁心用低損失酸化物磁性材料。Low loss oxide magnetic material for choke coil magnetic cores contained in the range of
ＦｅFe ２2 ＯO ３3 を４７ｍｏｌ％、47 mol%,
ＮｉＯを９〜３１ｍｏｌ％、9-31 mol% NiO,
ＣｕＯを１５ｍｏｌ％、15 mol% CuO,
残部をＺｎＯの組成比で含有し、The balance is contained in the composition ratio of ZnO,
添加物として、As an additive
ＣｏＯを０．５ｗｔ％CoO 0.5wt%
の範囲で含有するスイッチング電源用トランスの磁心用低損失酸化物磁性材料。A low-loss oxide magnetic material for a magnetic core of a switching power supply transformer contained in the range of
ＦｅFe ２2 ＯO ３3 を４７ｍｏｌ％、47 mol%,
ＮｉＯを９〜３１ｍｏｌ％、9-31 mol% NiO,
ＣｕＯを１５ｍｏｌ％、15 mol% CuO,
残部をＺｎＯの組成比で含有し、The balance is contained in the composition ratio of ZnO,
添加物として、As an additive
ＣｏＯを０．５ｗｔ％CoO 0.5wt%
の範囲で含有するチョークコイルの磁心用低損失酸化物磁性材料。Low loss oxide magnetic material for choke coil magnetic cores contained in the range of
ＦｅFe ２2 ＯO ３3 を４７ｍｏｌ％、47 mol%,
ＮｉＯを１７ｍｏｌ％、17 mol% NiO,
ＣｕＯを６〜２０ｍｏｌ％、6-20 mol% CuO,
残部をＺｎＯの組成比で含有し、The balance is contained in the composition ratio of ZnO,
添加物として、As an additive
ＣｏＯを０．５ｗｔ％CoO 0.5wt%
の範囲で含有するスイッチング電源用トランスの磁心用低損失酸化物磁性材料。A low-loss oxide magnetic material for a magnetic core of a switching power supply transformer contained in the range of
ＦｅFe ２2 ＯO ３3 を４７ｍｏｌ％、47 mol%,
ＮｉＯを１７ｍｏｌ％、17 mol% NiO,
ＣｕＯを６〜２０ｍｏｌ％、6-20 mol% CuO,
残部をＺｎＯの組成比で含有し、The balance is contained in the composition ratio of ZnO,
添加物として、As an additive
ＣｏＯを０．５ｗｔ％CoO 0.5wt%
の範囲で含有するチョークコイルの磁心用低損失酸化物磁性材料。Low loss oxide magnetic material for choke coil magnetic cores contained in the range of
ＦｅFe ２2 ＯO ３3 を４５．５〜４９ｍｏｌ％、45.5 to 49 mol%,
ＣｕＯを１５ｍｏｌ％、15 mol% CuO,
ＺｎＯを１８ｍｏｌ％、18 mol% ZnO,
残部をＮｉＯの組成比で含有し、The balance is contained in a composition ratio of NiO,
添加物として、As an additive
ＣｏＯを０．５ｗｔ％CoO 0.5wt%
の範囲で含有するスイッチング電源用トランスの磁心用低損失酸化物磁性材料。A low-loss oxide magnetic material for a magnetic core of a switching power supply transformer contained in the range of
ＦｅFe ２2 ＯO ３3 を４５．５〜４９ｍｏｌ％、45.5 to 49 mol%,
ＣｕＯを１５ｍｏｌ％、15 mol% CuO,
ＺｎＯを１８ｍｏｌ％、18 mol% ZnO,
残部をＮｉＯの組成比で含有し、The balance is contained in a composition ratio of NiO,
添加物として、As an additive
ＣｏＯを０．５ｗｔ％CoO 0.5wt%
の範囲で含有するチョークコイルの磁心用低損失酸化物磁性材料。Low loss oxide magnetic material for choke coil magnetic cores contained in the range of
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| JP03784096A JP3739849B2 (en) | 1996-02-26 | 1996-02-26 | Low-loss oxide magnetic material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03784096A JP3739849B2 (en) | 1996-02-26 | 1996-02-26 | Low-loss oxide magnetic material |
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| Publication Number | Publication Date |
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| JP3739849B2 true JP3739849B2 (en) | 2006-01-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2795855B1 (en) * | 1999-06-29 | 2001-10-05 | Thomson Csf | LOW LOSS FERRITES |
| US8436708B2 (en) * | 2007-12-25 | 2013-05-07 | Hitachi Metals, Ltd. | Multilayer inductor and power converter comprising it |
| JP5580961B2 (en) * | 2010-07-15 | 2014-08-27 | Ｆｄｋ株式会社 | Oxidized magnetic material and manufacturing method thereof |
| US9824802B2 (en) | 2012-10-31 | 2017-11-21 | Toda Kogyo Corp. | Ferrite sintered plate and ferrite sintered sheet |
| JP5880517B2 (en) | 2013-10-16 | 2016-03-09 | Tdk株式会社 | Ferrite composition and electronic component |
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