JP2017028088A - Flat soft magnetic metal powder for magnetic sheet, magnetic sheet, and antenna coil - Google Patents
Flat soft magnetic metal powder for magnetic sheet, magnetic sheet, and antenna coil Download PDFInfo
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Abstract
Description
本発明は、非接触通信端末向け磁性シートとして好適な、高透磁率かつ低損失の磁性シートに用いられる扁平状軟磁性金属粉末に関する。 The present invention relates to a flat soft magnetic metal powder suitable for use as a magnetic sheet for non-contact communication terminals and used for a magnetic sheet having high permeability and low loss.
非接触通信端末、特にアンテナコイル等を用いた端末やカード間での通信性能向上の目的で、軟磁性材料をシート状に加工した磁性シートが用いられる。
磁性シートの材料としてはフェライトシートを用いたシート、扁平状軟磁性金属粉末を用いたポリマーシート等があるが、従来技術によるこれらの材料は、部材に要求される性能、コストを十分に満足するものではなかった。
For the purpose of improving communication performance between non-contact communication terminals, particularly terminals using antenna coils and the like and cards, a magnetic sheet obtained by processing a soft magnetic material into a sheet shape is used.
The magnetic sheet material includes a sheet using a ferrite sheet and a polymer sheet using a flat soft magnetic metal powder. However, these materials according to the prior art sufficiently satisfy the performance and cost required for the member. It was not a thing.
特許文献１には通信距離向上の手段としてフェライトシート及び金属粉末を用いたポリマーシート等が開示されているが、フェライトシートは磁気特性に優れるが可とう性に乏しいため、保護フィルム等の部材を併用することが必要となり省部材化、低コスト化が困難である欠点を有する。また、金属粉末を用いたポリマーシートは、部材の可とう性に優れるため部材全体の構造の簡素化やコストダウンが期待されるが、磁気特性が十分でなかった。
Patent Document 1 discloses a ferrite sheet and a polymer sheet using metal powder as means for improving communication distance, but the ferrite sheet is excellent in magnetic properties but lacks flexibility, so a member such as a protective film is used. Since it is necessary to use them together, there is a drawback that it is difficult to reduce the number of members and reduce the cost. Moreover, since the polymer sheet using metal powder is excellent in the flexibility of the member, it is expected that the structure of the entire member is simplified and the cost is reduced, but the magnetic properties are not sufficient.
通信性能を向上させるためにはμ´×Ｑ（複素透磁率（μ＝μ´−ｉ・μ´´、ｉは虚数単位）の実部μ´
及び虚部μ´´で表される損失係数（ｔａｎδ＝μ´´／μ´）の逆数をＱ（μ´／μ´´）とする）等の特性が優れることが重要であり、磁性材料として複素透磁率の実数部（μ´）が大きく、虚数部（μ´´）が小さいことが要求される。
In order to improve communication performance, the real part μ ′ of μ ′ × Q (complex permeability (μ = μ′−i · μ ″, i is an imaginary unit))
In addition, it is important to have excellent characteristics such as Q (μ ′ / μ ″) as the reciprocal of the loss coefficient (tan δ = μ ″ / μ ′) represented by the imaginary part μ ″, and a magnetic material It is required that the real part (μ ′) of the complex permeability is large and the imaginary part (μ ″) is small.
上述した課題を解決し、目的を達成するために、本発明は、特定の金属材料組成を有する金属粉末を扁平化形状とし、所定の樹脂等と混合して磁気特性を向上した磁性シートを得ることで通信性能を向上させるものである。
合金成分としては、ａｔｍ％でＳｉ １４〜２２％、 Ｃｒ ０．１〜５％、Ｍｎ ０．１〜２％、及びＦｅを少なくとも含有することで本発明の目的を達成することができる。
また、金属粉末を扁平化形状とすることで反磁界が小さくなりμ´特性が向上する。
In order to solve the above-described problems and achieve the object, the present invention obtains a magnetic sheet having improved magnetic properties by making a metal powder having a specific metal material composition into a flattened shape and mixing it with a predetermined resin or the like. This improves communication performance.
As an alloy component, Si 14-22%, Cr 0.1-5%, Mn 0.1-2%, and Fe are contained by atm%, and the objective of this invention can be achieved.
Further, by making the metal powder into a flattened shape, the demagnetizing field is reduced and the μ ′ characteristics are improved.
上記扁平状軟磁性金属粉末（以下、場合により「扁平粉」という）は、扁平粉の重量平均粒径Ｄ５０が１０〜１００μｍ、平均厚さが０．５〜５μｍであると、より高透磁率磁性シートが得られやすく、かつ、シートの密度も向上する。Ｄ５０が１０μｍ未満であると、保磁力Ｈｃが小さな扁平粉が得られ難く、シート化した際にも扁平粉同士の隙間の数が多くなるため高透磁率磁性シートが得られ難くなる。一方、Ｄ５０が１００μｍを超えると、シートの表面が粗くなり厚さから算出されるシートの密度が低下する傾向がある。
また、扁平粉の平均厚さを０．５μｍ未満とすることは製造上、扁平化やシート化が困難となり、一方５μｍを超えると反磁界が大きくなりμ´特性が低下する。
The flat soft magnetic metal powder (hereinafter referred to as “flat powder” in some cases) is more highly transparent when the weight average particle diameter D 50 of the flat powder is 10 to 100 μm and the average thickness is 0.5 to 5 μm. A magnetic magnetic sheet can be easily obtained, and the density of the sheet is also improved. If D 50 is less than 10 [mu] m, hard coercive force Hc small flat powder is obtained, the number of gaps flat powders each other even when the sheets of the high-permeability magnetic sheet to become more difficult to obtain. On the other hand, if D 50 exceeds 100 [mu] m, the density of the sheet calculated from the sheet surface becomes rough thickness tends to decrease.
Further, when the average thickness of the flat powder is less than 0.5 μm, it is difficult to flatten or form a sheet in production. On the other hand, when it exceeds 5 μm, the demagnetizing field is increased and the μ ′ characteristic is deteriorated.
本発明は、磁性シート用の扁平状軟磁性金属粉末を特定の金属材料組成、及び粒子形状とすることで磁気特性を向上し、通信性能を向上することができるという効果を奏する。 The present invention has the effect that the magnetic properties can be improved and the communication performance can be improved by making the flat soft magnetic metal powder for magnetic sheets into a specific metal material composition and particle shape.
＜扁平状軟磁性金属粉末＞
本実施形態の扁平状軟磁性金属粉末は、ＦｅＳｉＣｒＭｎ系合金において、ａｔｍ％でＳｉ １４〜２２％、 Ｃｒ ０．１〜５％、Ｍｎ ０．１〜２％、及びＦｅを少なくとも含有することで高透磁率（μ´）及び低損失（μ´´）の磁性シートが得られる。Ｍｎを合金成分として上記の範囲で添加すると、熱処理温度の選定により保磁力Ｈｃが下がり、良好な特性が得られると考えられる。
また、扁平粉の重量平均粒径Ｄ５０が１０μｍ以上１００μｍ以下、平均厚さが０．５〜５μｍであると高透磁率の磁性シートが得られる。以下にその作製方法の一例を記載する。
<Flat soft magnetic metal powder>
In the FeSiCrMn alloy, the flat soft magnetic metal powder of the present embodiment contains at least 14% to 22% Si, 0.1% to 5% Cr, 0.1% to 2% Mn, and Fe atm%. A magnetic sheet having high magnetic permeability (μ ′) and low loss (μ ″) is obtained. When Mn is added as an alloy component in the above range, it is considered that the coercive force Hc is lowered by selecting the heat treatment temperature, and good characteristics are obtained.
The weight average particle diameter D 50 of the flat powder is 10μm or 100μm or less, the magnetic sheet of the average thickness is 0.5~5μm high permeability can be obtained. An example of the manufacturing method is described below.
軟磁性合金粉末は、水アトマイズ法、ガスアトマイズ法又はガス噴霧水アトマイズ法などのアトマイズ法で作製するのが簡便である。本発明においては、低コストで合金粉末を得ることが可能な水アトマイズ法で製造された軟磁性合金粉末を用いたが、本発明はこれに限定されるものではない。 The soft magnetic alloy powder can be easily produced by an atomizing method such as a water atomizing method, a gas atomizing method, or a gas spray water atomizing method. In the present invention, the soft magnetic alloy powder manufactured by the water atomization method capable of obtaining the alloy powder at low cost is used, but the present invention is not limited to this.
上記合金粉末を乾燥後、扁平化処理を行う。
扁平化方法は、特に制限はなく、例えば、アトライタ、ボールミル、振動ミル等を用いて行なうことができる。中でも、ボールミルや振動ミルに比べ、短時間で処理できるアトライタを用いることが好ましい。また、扁平化処理は有機溶媒を用いて湿式で行なうことが好ましい。
有機溶媒を添加することにより脆い軟磁性合金粉末を用いた場合でも、その粒子径が大きく、十分に扁平化された扁平粉を高い歩留りで作製できる。
上記有機溶媒としては、例えば、トルエン、ヘキサン、アセトン、メタノール及び炭素数２〜４の１価アルコールを用いることができる。
有機溶媒の添加量は、合金粉末１００質量部に対して、２００〜２０００質量部であることが好ましく、５００〜１０００質量部であることがより好ましい。有機溶媒の添加量が２００質量部未満では、扁平粉の粒径が小さくなる傾向があり、２０００質量部を超えると、処理時間が長くなり生産性が低下する。
The alloy powder is dried and then flattened.
There is no restriction | limiting in particular in the flattening method, For example, it can carry out using an attritor, a ball mill, a vibration mill, etc. Among these, it is preferable to use an attritor that can process in a shorter time than a ball mill or a vibration mill. In addition, the flattening treatment is preferably performed in a wet manner using an organic solvent.
Even when a soft magnetic alloy powder that is brittle is used by adding an organic solvent, a flat powder that has a large particle size and is sufficiently flattened can be produced with a high yield.
As said organic solvent, toluene, hexane, acetone, methanol, and a C2-C4 monohydric alcohol can be used, for example.
The amount of the organic solvent added is preferably 200 to 2000 parts by mass and more preferably 500 to 1000 parts by mass with respect to 100 parts by mass of the alloy powder. If the addition amount of the organic solvent is less than 200 parts by mass, the particle size of the flat powder tends to be small, and if it exceeds 2000 parts by mass, the processing time becomes long and the productivity decreases.
扁平粉の粒径を大きくするために、有機溶媒と共に扁平化助剤を用いてもよい。扁平化助剤としては、例えば、ステアリン酸等の脂肪酸を好適に用いることができる。扁平化助剤の添加量は、熱処理粉末１００質量部に対して、０．１〜５質量部であることが好ましく、０．５〜２質量部であることがより好ましい。扁平化助剤の添加量が５質量部を超えても扁平粉の粒径はそれ以上大きくならない上に、有機溶媒の回収利用が困難になり、熱処理炉の汚染が激しくなる。また、有機溶媒として炭素数２〜４の１価アルコール類を使用した場合、扁平化助剤を添加しなくても粒径の大きな扁平粉が得られる。 In order to increase the particle size of the flat powder, a flattening aid may be used together with the organic solvent. As the flattening aid, for example, fatty acids such as stearic acid can be suitably used. The amount of the flattening aid added is preferably 0.1 to 5 parts by mass and more preferably 0.5 to 2 parts by mass with respect to 100 parts by mass of the heat-treated powder. Even if the addition amount of the flattening aid exceeds 5 parts by mass, the particle size of the flat powder does not increase any more, and it becomes difficult to recover and use the organic solvent, and contamination of the heat treatment furnace becomes severe. Further, when monohydric alcohols having 2 to 4 carbon atoms are used as the organic solvent, a flat powder having a large particle size can be obtained without adding a flattening aid.
扁平化時間は、所定の平均粒径及び平均厚さとなる時間とする。扁平化の装置や条件にもよるが、滞留時間（合金粉末に有機溶媒を加えたスラリーが処理装置内を通過して処理される実時間）として１〜５時間程度が所定の粒径及び厚さを得るために好適である。扁平粉の粒径が大きくなるにつれ平均厚さは小さくなり、平均粒径Ｄ５０／平均厚さ で定義されるアスペクト比が大きくなる。アスペクト比が大きくなるとかさ密度ＢＤは小さくなるため、アスペクト比の代用特性として、扁平粉のかさ密度ＢＤを用いることができる。本発明において、アスペクト比が２０以上５０以下となると透磁率特性が向上するが、その際のかさ密度は本実施例記載のＦｅＳｉＣｒＭｎ系合金では、０．１５〜０．５０Ｍｇ／ｍ３である。ＢＤは、ＪＩＳ Ｋ−５１０１に準拠する方法でカサ比重測定器を用いて測定することができる。 The flattening time is a time for obtaining a predetermined average particle diameter and average thickness. Although depending on the flattening device and conditions, about 1 to 5 hours is a predetermined particle size and thickness as a residence time (actual time in which a slurry obtained by adding an organic solvent to the alloy powder passes through the processing device). It is suitable for obtaining the thickness. As the particle size of the flat powder increases, the average thickness decreases and the aspect ratio defined by the average particle size D 50 / average thickness increases. Since the bulk density BD decreases as the aspect ratio increases, the bulk density BD of flat powder can be used as a substitute characteristic of the aspect ratio. In the present invention, when the aspect ratio is 20 or more and 50 or less, the magnetic permeability characteristics are improved. In this case, the bulk density is 0.15 to 0.50 Mg / m 3 in the FeSiCrMn alloy described in this example. BD can be measured by using a specific gravity measuring instrument in accordance with JIS K-5101.
扁平粉の重量平均粒径Ｄ５０及び平均厚さは、次の方法で測定した値とする。
Ｄ５０はフランホーファーの回折理論を利用したレーザー回折式の粒度分布測定装置により測定され、体積分布の積算で５０％になるときの粒径とする。本実施例では、乾式分散ユニットを有する日本レーザー社製の「ＨＥＬＯＳ ＳＹＳＴＥＭ」を用いた測定値とした。
平均厚さは扁平粉を樹脂埋め後、研磨面と垂直な方向の磁束を有する磁石の上で硬化し、鏡面加工後、断面をＳＥＭで観察した値とした。
アスペクト比は上記平均粒径及び平均厚さを用いて「Ｄ５０／厚さ」の値とした。
Weight average particle diameter D 50 and an average thickness of the flat powder is a value measured by the following method.
D 50 is measured by a laser diffraction type particle size distribution measuring apparatus using the Franchoffer diffraction theory, and is a particle diameter when the volume distribution is 50%. In this example, the measurement value was determined using “HELOS SYSTEM” manufactured by Nippon Laser Co., Ltd. having a dry dispersion unit.
The average thickness was a value obtained by embedding a flat powder with a resin, then curing on a magnet having a magnetic flux in a direction perpendicular to the polished surface, and after mirror finishing, the cross section was observed with an SEM.
The aspect ratio was set to the value of “D 50 / thickness” using the average particle diameter and the average thickness.
なお、扁平化処理後、得られた扁平状軟磁性金属粉末を不活性雰囲気中で熱処理することが好ましい。これにより、保磁力Ｈｃが小さくなり高透磁率磁性シートが得られやすくなる。熱処理温度や保持時間は、扁平状軟磁性金属粉末の組成や積載量により選択する。保磁力Ｈｃは市販のＨｃメーター（本実施例では、東北特殊鋼株式会社製、商品名「Ｋ−ＨＣ１０００」）を用いて測定することができる。 In addition, it is preferable to heat-process the obtained flat soft magnetic metal powder in an inert atmosphere after a flattening process. Thereby, the coercive force Hc becomes small and it becomes easy to obtain a high permeability magnetic sheet. The heat treatment temperature and holding time are selected depending on the composition and loading amount of the flat soft magnetic metal powder. The coercive force Hc can be measured using a commercially available Hc meter (in this example, manufactured by Tohoku Special Steel Co., Ltd., trade name “K-HC1000”).
＜磁性シート＞
磁性シートは、上記扁平状軟磁性金属粉末を用いて作製することができる。本発明の磁性シートの作製方法について一例を示すと次のようになる。
扁平状軟磁性金属粉末とバインダーとしてポリウレタン樹脂、希釈溶剤としてトルエン、キシレン、酢酸ブチル等から選択される溶剤と、メチルエチルケトン等の溶剤との混合溶剤を含む磁性塗料を混練する。混練方法は特に限定されないが、本実施例ではプラネタリーミキサーを用いた。混練終了直前に硬化剤としてイソシアネート化合物を加え、最後に真空脱泡し塗料に含まれる気泡を除去する。
<Magnetic sheet>
The magnetic sheet can be produced using the flat soft magnetic metal powder. An example of the method for producing the magnetic sheet of the present invention is as follows.
A magnetic coating material containing a mixed solvent of a flat soft magnetic metal powder, a polyurethane resin as a binder, a solvent selected from toluene, xylene, butyl acetate and the like as a diluent solvent, and a solvent such as methyl ethyl ketone is kneaded. The kneading method is not particularly limited, but a planetary mixer was used in this example. Immediately before the end of kneading, an isocyanate compound is added as a curing agent, and finally, vacuum deaeration is performed to remove bubbles contained in the paint.
バインダーの配合比は、扁平状軟磁性金属粉末１００重量部に対し、好ましくは８重量部以上２２重量部以下の範囲内に、さらに好ましくは８重量部以上１８重量部以下の範囲内に設定される。
硬化剤の添加量は、バインダー１００重量部に対して５重量部以上３０重量部以下の範囲内に、さらに好ましくは１０重量部以上２０重量部以下の範囲内に設定される。
揮発性溶剤の添加量は、塗料粘度が一定範囲になるように調整する。塗料粘度の範囲は４００〜１５００ｍＰａ・ｓが好ましい。塗料粘度が４００ｍＰａ・ｓ未満であると、塗布直後に行なう磁場配向の痕跡が残りやすく、塗料粘度が高いと乾燥後のシート表面に凹凸が残りやすく外観が悪くなる。
The blending ratio of the binder is preferably set in the range of 8 to 22 parts by weight, more preferably in the range of 8 to 18 parts by weight with respect to 100 parts by weight of the flat soft magnetic metal powder. The
The addition amount of the curing agent is set in the range of 5 to 30 parts by weight, more preferably in the range of 10 to 20 parts by weight with respect to 100 parts by weight of the binder.
The amount of the volatile solvent added is adjusted so that the viscosity of the paint is in a certain range. The range of the viscosity of the paint is preferably 400 to 1500 mPa · s. If the paint viscosity is less than 400 mPa · s, traces of magnetic field orientation performed immediately after application tend to remain, and if the paint viscosity is high, irregularities are likely to remain on the sheet surface after drying, resulting in poor appearance.
上記磁性塗料をドクターブレード法でベースフィルム上に所定の厚さで塗布し、磁場配向後、乾燥する。ベースフィルムは特に限定されないが本実施例では厚さ７５μｍのポリエチレンテレフタレート（ＰＥＴ）フィルムを用いた。
磁場配向後のシートを乾燥するが、乾燥方法は自然乾燥でも加熱による強制乾燥でも良い。
The magnetic coating material is applied to the base film at a predetermined thickness by the doctor blade method, dried after magnetic field orientation. Although the base film is not particularly limited, a polyethylene terephthalate (PET) film having a thickness of 75 μm was used in this example.
The sheet after the magnetic field orientation is dried. The drying method may be natural drying or forced drying by heating.
乾燥後の磁性シートは、密度及び磁気特性により評価する。密度は磁性シートを外径１８ｍｍ、内径１０ｍｍの金型を用いてロット毎に６枚ずつトロイダル形状に打ち抜き、その重量とスピンドル径が６ｍｍのマイクロメーターを用いて測定した厚さから求めた。磁気特性は上記トロイダル形状の試料を６枚重ねてインピーダンスアナライザ（Ａｇｉｌｅｎｔ Ｔｅｃｈｎｏｌｏｇｉｅｓ社製、商品名「Ｅ４９９１Ａ」）と付属のテストフィクスチャー（１６４５４Ａ）を用いて１ターン法で測定した。 The dried magnetic sheet is evaluated by density and magnetic properties. The density was determined from the thickness measured using a micrometer with a magnetic sheet having a diameter of 18 mm and an inner diameter of 10 mm, punched into 6 toroidal shapes for each lot, and a spindle having a spindle diameter of 6 mm. The magnetic properties were measured by a one-turn method using six impedance samples (trade name “E4991A” manufactured by Agilent Technologies) and the attached test fixture (16454A) by superposing six toroidal samples.
非接触通信端末の磁芯部材として使用される磁性シートの通信性能を向上させるためにはμ´×Ｑであらわされる性能指数が優れることが重要であり、本発明によればこの指数が２０００以上となるため良好な通信性能が得られる。
以上、本発明の好適な実施形態について説明したが、本発明はこれに限定されるものではない。
In order to improve the communication performance of the magnetic sheet used as the magnetic core member of the non-contact communication terminal, it is important that the performance index represented by μ ′ × Q is excellent. According to the present invention, this index is 2000 or more. Therefore, good communication performance can be obtained.
As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this.
以下に、本発明を実施例に基づいて具体的に説明する。
（実施例１〜７）
水アトマイズ法にて表１の合金組成となるように作製した合金粉末を乾燥後、質量比で７．３倍のイソプロピルアルコールを添加し、アトライタを用いてかさ密度ＢＤが約０．３０Ｍｇ／ｍ３になるまで扁平化処理した。得られた扁平粉の平均粒径Ｄ５０は３０〜３８μｍ、平均厚さは１．１〜１．３μｍであった。この扁平粉をＡｒガス雰囲気中で２時間熱処理し、保磁力Ｈｃが約４００Ａ／ｍの扁平状軟磁性金属粉末を得た。
上記扁平状軟磁性金属粉末に結合材と有機溶媒を添加し混練後、硬化剤を添加し、混練しながら真空脱泡した。
得られた磁性塗料を７５μｍ厚のＰＥＴ製のベースフィルムの一方の面上に、ブレード塗布方式により塗布厚さ４００μｍで塗布し、磁場配向後乾燥した。乾燥は常温（２５℃）にて行い磁性シートを作製した。
The present invention will be specifically described below based on examples.
(Examples 1-7)
After drying the alloy powder prepared to have the alloy composition shown in Table 1 by the water atomization method, 7.3 times as much isopropyl alcohol is added by mass ratio, and the bulk density BD is about 0.30 Mg / m using an attritor. Flattening was performed until 3 . The resulting average particle size D 50 of the flat powder is 30～38Myuemu, average thickness was 1.1～1.3Myuemu. This flat powder was heat-treated in an Ar gas atmosphere for 2 hours to obtain a flat soft magnetic metal powder having a coercive force Hc of about 400 A / m.
A binder and an organic solvent were added to the flat soft magnetic metal powder and kneaded, followed by addition of a curing agent and vacuum degassing while kneading.
The obtained magnetic coating material was applied on one surface of a 75 μm-thick PET base film with a coating thickness of 400 μm by a blade coating method, dried after magnetic field orientation. Drying was performed at room temperature (25 ° C.) to prepare a magnetic sheet.
（比較例１〜４）
合金組成として、Ｍｎを含まないか、もしくはＭｎをａｔｍ％で２％を超える比率とした以外は実施例１〜７と同様の方法で磁性シートを作製した。
（比較例５〜８）
合金組成として、Ｃｒをａｔｍ％で０％または５％を超える比率としたか、もしくはＳｉをａｔｍ％で１４％未満か２２％を超える比率とした以外は実施例１〜７と同様の方法で磁性シートを作製した。
(Comparative Examples 1-4)
Magnetic sheets were produced in the same manner as in Examples 1 to 7 except that Mn was not included as the alloy composition, or Mn was changed to a ratio exceeding 2% in atm%.
(Comparative Examples 5 to 8)
As an alloy composition, the same method as in Examples 1 to 7 except that Cr was 0% or more than 5% atm%, or Si was less than 14% or more than 22% atm%. A magnetic sheet was prepared.
表１に、合金組成を変えた時の実験結果を示した。
以上のように、本発明に関わる扁平状軟磁性粉末を用いることにより、高透磁率（μ´）、低損失（μ´´）の磁性シートが実現でき、非接触通信端末の通信距離を改善するために有用である。 As described above, by using the flat soft magnetic powder according to the present invention, a magnetic sheet with high magnetic permeability (μ ′) and low loss (μ ″) can be realized, and the communication distance of the non-contact communication terminal is improved. Useful to do.
Claims (4)
結合剤を含む、
磁性シート。 A flat soft magnetic metal powder for a magnetic sheet according to claim 1 or 2,
Including a binder,
Magnetic sheet.
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|---|---|---|---|---|
| JP2008050644A (en) * | 2006-08-23 | 2008-03-06 | Sanyo Special Steel Co Ltd | Flat powder for electromagnetic wave absorbent body, and electromagnetic wave absorbent body |
| JP2008115404A (en) * | 2006-10-31 | 2008-05-22 | Mitsubishi Materials Corp | Flat metal powdery mixture having low coercive force and high permeability, and electromagnetic interference suppressor comprising the flat metal powdery mixture |
| JP2012160726A (en) * | 2011-01-28 | 2012-08-23 | Sumida Corporation | Magnetic powder material, low-loss composite magnetic material containing magnetic powder material, and magnetic element containing low-loss composite magnetic material |
| JP2014204051A (en) * | 2013-04-09 | 2014-10-27 | 山陽特殊製鋼株式会社 | Soft magnetic flat-particle powder, and magnetic sheet arranged by use thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008050644A (en) * | 2006-08-23 | 2008-03-06 | Sanyo Special Steel Co Ltd | Flat powder for electromagnetic wave absorbent body, and electromagnetic wave absorbent body |
| JP2008115404A (en) * | 2006-10-31 | 2008-05-22 | Mitsubishi Materials Corp | Flat metal powdery mixture having low coercive force and high permeability, and electromagnetic interference suppressor comprising the flat metal powdery mixture |
| JP2012160726A (en) * | 2011-01-28 | 2012-08-23 | Sumida Corporation | Magnetic powder material, low-loss composite magnetic material containing magnetic powder material, and magnetic element containing low-loss composite magnetic material |
| JP2014204051A (en) * | 2013-04-09 | 2014-10-27 | 山陽特殊製鋼株式会社 | Soft magnetic flat-particle powder, and magnetic sheet arranged by use thereof |
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