JP2710152B2 - High frequency dust core and manufacturing method thereof - Google Patents
High frequency dust core and manufacturing method thereofInfo
- Publication number
- JP2710152B2 JP2710152B2 JP4649093A JP4649093A JP2710152B2 JP 2710152 B2 JP2710152 B2 JP 2710152B2 JP 4649093 A JP4649093 A JP 4649093A JP 4649093 A JP4649093 A JP 4649093A JP 2710152 B2 JP2710152 B2 JP 2710152B2
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- JP
- Japan
- Prior art keywords
- soft magnetic
- powder
- dust core
- magnetic powder
- high frequency
- 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.)
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば電源装置用チョ
ークコイル等に用いられる高周波用圧粉磁心，及びその
製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency dust core used for, for example, a choke coil for a power supply device, and a method of manufacturing the same.
【０００２】[0002]
【従来の技術】従来、交流用軟磁性材料として、表面を
絶縁皮膜処理した珪素を含む電磁鋼板を何層にも積層し
たものがトランス等に用いられている。ところで最近で
は、インバータ制御方式の普及に伴って、高周波帯域で
の磁気特性の改善が求められている。しかし、上記珪素
鋼板を積層したタイプの磁心では、せいぜい１〜２ＨＫ
ｚ以下の周波数帯域でしか用いることができず、高周波
用磁性材料としては不適当である。2. Description of the Related Art Conventionally, as a soft magnetic material for an alternating current, a multilayered electromagnetic steel sheet containing silicon whose surface is treated with an insulating film is used for a transformer or the like. By the way, recently, with the spread of the inverter control system, improvement of magnetic characteristics in a high frequency band is required. However, in the magnetic core of the type in which the silicon steel plates are laminated, at most 1-2HK
It can be used only in a frequency band equal to or lower than z, and is unsuitable as a high-frequency magnetic material.
【０００３】一方、高周波用磁性材料としては、近年多
用されているソフトフェライトがある。このソフトフェ
ライトは上記珪素鋼板と比較すると、高周波特性に優
れ、鉄損値も低いが、磁束密度が低いという欠点があ
る。On the other hand, as a high frequency magnetic material, there is a soft ferrite which is frequently used in recent years. This soft ferrite is superior to the above-mentioned silicon steel sheet in high-frequency characteristics and has a low iron loss value, but has a drawback of low magnetic flux density.
【０００４】このような問題に対して、最近、軟磁性粉
末にエポキシ樹脂やふっ素系樹脂等の有機バインダーを
被覆した圧粉磁心材料が提案されている（例えば、特開
昭59-50138号公報参照) 。また、軟磁性粉末に珪酸ソー
ダを主成分とする水ガラス等の無機バインダーを被覆し
た磁心材料も開発されている。これらの粉末磁心材料
は、上記ソフトフェライトに比べて磁束密度を向上でき
る利点があり、高周波特性の改善が図れる。In order to solve such a problem, a dust core material in which a soft magnetic powder is coated with an organic binder such as an epoxy resin or a fluororesin has recently been proposed (for example, Japanese Patent Application Laid-Open No. 59-50138). See). Also, a magnetic core material in which a soft magnetic powder is coated with an inorganic binder such as water glass containing sodium silicate as a main component has been developed. These powder magnetic core materials have an advantage that the magnetic flux density can be improved as compared with the soft ferrite, and the high frequency characteristics can be improved.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記軟
磁性粉末を樹脂，あるいは水ガラスで被覆したもので
は、耐熱性に乏しいという問題点がある。そのため、粉
末成形時に軟磁性粉末内部に発生する歪を開放させるた
めに必要な温度まで加熱することができず、保磁力の減
少を図ることが困難である。その結果、高周波域での鉄
損値が大きくなり、磁心として使用可能な周波数帯域に
限界が生じる問題がある。However, when the soft magnetic powder is coated with resin or water glass, there is a problem that heat resistance is poor. Therefore, it is not possible to heat to a temperature necessary for releasing the strain generated inside the soft magnetic powder during powder molding, and it is difficult to reduce the coercive force. As a result, there is a problem that an iron loss value in a high frequency range is increased, and a frequency band usable as a magnetic core is limited.
【０００６】ここで、本件出願人は、先に、歪取り温度
に耐え得るものとして、軟磁性粉末にＣｒ及びＰを必須
元素とするガラス状絶縁層を被覆してなる磁心材料を開
発した。この磁心材料によれば、絶縁層の構成元素とし
てＣｒ及びＰを採用したので、耐熱性が向上し、固化成
形時に生じる歪を開放するのに必要な温度に加熱でき、
その結果鉄損失を小さくできるとともに、使用可能な高
周波帯域を拡大でき、かつ絶縁性及び磁束密度を向上で
きる。Here, the present applicant has previously developed a magnetic core material formed by coating a soft magnetic powder with a glass-like insulating layer containing Cr and P as essential elements as a material capable of withstanding a strain relief temperature. According to this magnetic core material, since Cr and P are employed as constituent elements of the insulating layer, heat resistance is improved, and the material can be heated to a temperature required to release strain generated during solidification molding,
As a result, the iron loss can be reduced, the usable high frequency band can be expanded, and the insulating property and the magnetic flux density can be improved.
【０００７】ところで、上記Ｃｒ，Ｐ酸化物からなる被
覆層の場合、上述の問題を解消できるものの、Ｃｒ公害
の観点から問題を残しており、この点の改善が要請され
ている。By the way, in the case of the coating layer made of Cr and P oxides described above, although the above problem can be solved, there remains a problem from the viewpoint of Cr pollution, and improvement of this point is demanded.
【０００８】本発明の目的は、Ｃｒ，Ｐ酸化物被覆層と
同等の磁束密度，鉄損値，及び周波数特性を有する磁心
材料を見出し、上記要請に応えられる高周波用圧粉磁心
及びその製造方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to find a magnetic core material having the same magnetic flux density, iron loss value, and frequency characteristics as Cr and P oxide coating layers, and to meet the above-mentioned demands, and to provide a high-frequency dust core and a method of manufacturing the same. Is to provide.
【０００９】[0009]
【課題を解決するための手段】請求項１の発明は、軟磁
性粉末を圧粉，接合，固化してなる高周波用圧粉磁心に
おいて、上記軟磁性粉末がＰ，Ｍｇ，Ｂ，Ｆｅを必須元
素とするガラス状絶縁層で被覆されていることを特徴と
している。According to a first aspect of the present invention, there is provided a high frequency dust core obtained by compacting, bonding and solidifying soft magnetic powder, wherein the soft magnetic powder contains P, Mg, B and Fe as essential components. It is characterized by being covered with a glassy insulating layer as an element.
【００１０】また請求項２の発明は、上記高周波用圧粉
磁心の製造方法であって、軟磁性粉末と、Ｐ，Ｍｇ，
Ｂ，Ｆｅを必須元素とするガラス状絶縁剤とを混合する
とともに該混合体を乾燥させて水分を除去する第１工程
と、該乾燥した混合体を粉末成形プレスにて固化成形す
る第２工程と、該固化成形体を焼鈍する第３工程とを備
えたことを特徴としている。A second aspect of the present invention is the method for manufacturing the high frequency dust core, wherein the soft magnetic powder, P, Mg,
A first step of mixing a glassy insulating material containing B and Fe as essential elements and drying the mixture to remove moisture, and a second step of solidifying and molding the dried mixture with a powder molding press And a third step of annealing the solidified compact.
【００１１】また、請求項３，４の発明は上記絶縁層が
被覆された軟磁性粉末に、エポキシ樹脂，イミド樹脂，
あるいはふっ素系樹脂からなる樹脂層を再被覆すること
を特徴としている。According to a third aspect of the present invention, the soft magnetic powder coated with the insulating layer comprises an epoxy resin, an imide resin,
Alternatively, the method is characterized in that a resin layer made of a fluororesin is recoated.
【００１２】ここで、本発明の軟磁性粉末としては、珪
素鋼粉，センダスト粉，アモルファス粉さらにはパーマ
ロイ粉等が採用可能であるが、高純度アトマイズ鉄粉を
採用するのが望ましく、これにより磁束密度の改善効果
が得られる。Here, as the soft magnetic powder of the present invention, silicon steel powder, sendust powder, amorphous powder, permalloy powder and the like can be used, but it is preferable to use high-purity atomized iron powder. The effect of improving the magnetic flux density is obtained.
【００１３】上記高純度鉄粉を採用する場合、磁気特性
の向上を図るうえで、双ロールやボールミルで偏平度を
１〜６に偏平加工し、これにより反磁界係数を低下させ
ることが有効である。When the high-purity iron powder is used, in order to improve the magnetic properties, it is effective to flatten the flatness to 1 to 6 with a twin roll or a ball mill, thereby lowering the demagnetizing coefficient. is there.
【００１４】さらに、うず電流を微小域に閉じ込めるた
めに上記軟磁性粉末を微粉化することは、磁束密度を若
干犠牲にするが高周波特性の安定性，低鉄損を得るうえ
で有効である。Further, pulverizing the soft magnetic powder in order to confine the eddy current in a very small area is effective in obtaining a high frequency characteristic stability and a low iron loss, although the magnetic flux density is slightly sacrificed.
【００１５】[0015]
【作用】請求項１及び２の発明に係る高周波用圧粉磁心
及びその製造方法によれば、軟磁性粉末をガラス状絶縁
層で被覆したので、この元来絶縁特性に良好なガラス状
絶縁層を介して軟磁性粉末同士を接合でき、絶縁性及び
磁束密度を向上できる。そして本発明では、上記ガラス
状絶縁層の構成元素としてＰ，Ｍｇ，Ｂ，Ｆｅを採用し
たので、上述のＣｒ公害の問題を生じることなく耐熱性
を向上できる。これにより固化成形時に生じる歪を開放
するのに必要な温度に加熱でき、その結果鉄損失を小さ
くできるとともに、使用可能な高周波帯域を拡大でき、
かつ絶縁性及び磁束密度を向上でき、Ｃｒ，Ｐ酸化物被
覆層と同等の特性が得られ、上述の要請に応えられる。According to the high frequency dust core and the method of manufacturing the same according to the first and second aspects of the present invention, the soft magnetic powder is covered with the glassy insulating layer. The soft magnetic powders can be joined to each other via the metal, and the insulating property and the magnetic flux density can be improved. In the present invention, since P, Mg, B, and Fe are employed as the constituent elements of the glassy insulating layer, the heat resistance can be improved without causing the above-described problem of Cr pollution. As a result, it can be heated to a temperature required to release the strain generated during solidification molding, and as a result, iron loss can be reduced and the usable high frequency band can be expanded,
In addition, the insulating property and the magnetic flux density can be improved, the same characteristics as those of the Cr and P oxide coating layers can be obtained, and the above demand can be satisfied.
【００１６】また、請求項３，４の発明では、絶縁層が
被覆された軟磁性粉末に、エポキシ樹脂，イミド樹脂，
あるいはふっ素系樹脂からなる樹脂層を被覆したので、
成形体の機械的強度を向上できる。According to the third and fourth aspects of the present invention, an epoxy resin, an imide resin,
Or because it covered a resin layer made of fluororesin,
The mechanical strength of the molded body can be improved.
【００１７】[0017]
【実施例】以下、本発明の実施例を図について説明す
る。図１及び図２は本発明の一実施例による高周波用圧
粉磁心及びその製造方法を説明するための図であり、図
１は絶縁処理された軟磁性粉末の模式図、図２は製造工
程を示す模式図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and 2 are views for explaining a high-frequency dust core according to one embodiment of the present invention and a method of manufacturing the same, FIG. 1 is a schematic view of an insulated soft magnetic powder, and FIG. FIG.
【００１８】図１において、１は本実施例の圧粉磁心を
構成する軟磁性粉末であり、該粉末１の外表面はガラス
状絶縁層２で被覆されている。そして、上記軟磁性粉末
１同士は上記絶縁層２を介して接合されている。ここ
で、上記軟磁性粉末１は、高純度アトマイズ鉄粉をボー
ルミル又は双ロールで偏平度（平均直径／厚さ）１〜６
の範囲内に偏平加工を施してなるものである。また、上
記絶縁層２は、Ｐ，Ｍｇ，Ｂ，Ｆｅを含有するガラス状
のものであり、後述する歪取りの焼鈍処理において硬化
処理されたものである。In FIG. 1, reference numeral 1 denotes a soft magnetic powder constituting the dust core of the present embodiment, and the outer surface of the powder 1 is covered with a glass-like insulating layer 2. The soft magnetic powders 1 are joined via the insulating layer 2. Here, the soft magnetic powder 1 is obtained by flattening (average diameter / thickness) 1 to 6 of a high-purity atomized iron powder by a ball mill or a twin roll.
The flattening process is performed within the range. The insulating layer 2 is a glass-like material containing P, Mg, B, and Fe, and has been subjected to a hardening process in a later-described annealing process for removing strain.
【００１９】次に、図２に沿って上記圧粉磁心の一製造
方法を説明する。まず、水１ｌ当たり、リン酸（１６３
ｇ）、ＭｇＯ（３１ｇ以下）、ホウ酸（３０ｇ）を含む
混合液からなる絶縁処理液４を作成する。この処理液４
を６０メッシュ以下の高純度鉄粉３（１００ｇ）に対し
て０．０５〜３０ｍｌ添加，混合する。次にこの混合体
５を４００℃以下で約１０分間乾燥させ、この後解粒
し、絶縁処理粉末６とする。（図２(a),(b) 、第1 工
程）。Next, a method of manufacturing the above-described dust core will be described with reference to FIG. First, phosphoric acid (163
g), an insulating solution 4 composed of a mixed solution containing MgO (31 g or less) and boric acid (30 g) is prepared. This treatment liquid 4
Is added to and mixed with high purity iron powder 3 (100 g) of 60 mesh or less in an amount of 0.05 to 30 ml. Next, the mixture 5 is dried at 400 ° C. or lower for about 10 minutes, and then pulverized to obtain an insulating powder 6. (FIGS. 2A and 2B, first step).
【００２０】ここで上記絶縁処理液４を作成する場合、
ＭｇＯはwt比でリン酸：ＭｇＯ＝５．３：１以上にする
と溶かしきれないので、これを上限とするのが望まし
い。また上記処理液４のリン酸濃度は、絶縁層の耐熱性
を向上させるＭｇＯを溶かすのに必要であるが、この比
率以上になると上記リン酸量を多くするほど磁束密度が
低下することから上記比率以下とする。上述のＣｒ，Ｐ
酸化物層を形成した場合は、その処理回数を増やすこと
により絶縁性の改善効果が認められたが、上記Ｐ，Ｍ
ｇ，Ｂ，Ｆｅ酸化物層の場合は、処理回数を増やすより
もむしろ表面活性剤を添加し、上記処理液と軟磁性粉末
とのぬれ性を向上させる方が有効であると思われる。Here, when preparing the insulating treatment liquid 4,
MgO cannot be completely dissolved if phosphoric acid: MgO = 5.3: 1 or more in terms of wt ratio, so it is desirable to set this as the upper limit. Further, the concentration of phosphoric acid in the treatment liquid 4 is necessary for dissolving MgO for improving the heat resistance of the insulating layer. However, when the ratio exceeds this ratio, as the amount of phosphoric acid increases, the magnetic flux density decreases. It should be less than the ratio. Cr, P described above
In the case where an oxide layer was formed, the effect of improving the insulating property was recognized by increasing the number of treatments.
In the case of the g, B, and Fe oxide layers, it may be more effective to add a surfactant to improve the wettability between the treatment liquid and the soft magnetic powder, rather than increasing the number of treatments.
【００２１】また、上記絶縁処理粉末６に、エポキシ樹
脂，イミド樹脂，ふっ素系樹脂あるいは水ガラスを添
加，混合してもよく、このようにした場合は固化成形時
の機械的強度を向上できる。Further, an epoxy resin, an imide resin, a fluorine-based resin or water glass may be added to and mixed with the above-mentioned insulating powder 6. In such a case, the mechanical strength during solidification molding can be improved.
【００２２】そして、上記水分を除去した絶縁処理粉末
６に必要に応じて、ステアリン酸カルシウム等の潤滑剤
を０．６５wt％程度添加し、この混合体５を通常の粉末
成形プレス７により所定の磁心形状に固化成形する（図
２(c) 、第２工程）。If necessary, a lubricant such as calcium stearate is added to the insulation-treated powder 6 from which water has been removed at about 0.65 wt%. It is solidified into a shape (FIG. 2 (c), second step).
【００２３】この固化成形において、プレス７の成形圧
力は３〜６ton/cm2 が適当である。３ton/cm2 以下の圧
力では、成形体が脆くハンドリングが困難となり、また
６ton/cm2 を越えると、形成された絶縁層２の破壊を招
き高周波特性の劣化の原因となるとともに、金型寿命の
低下を招くからである。In this solidification molding, the molding pressure of the press 7 is suitably from 3 to 6 ton / cm 2 . The 3 ton / cm 2 or less of pressure, the molded body is fragile handling becomes difficult, and if it exceeds 6 ton / cm 2, could result in deterioration of the high-frequency characteristics leads to destruction of the formed insulating layer 2, die life This leads to a decrease in
【００２４】次いで、上記固化成形体を、４００℃〜６
００℃で約１時間加熱，焼鈍する（第３工程）。この結
果、純鉄粉中に生じていた歪が開放されると同時に絶縁
層が固化処理されてガラス状となり、所定形状の圧粉磁
心が得られる。なお、上記焼鈍処理はＡｒ，Ｎ等の不活
性ガス雰囲気で処理するのが望ましい。Next, the solidified molded body is heated at 400 ° C. to 6 ° C.
Heat and anneal at 00 ° C. for about 1 hour (third step). As a result, the strain generated in the pure iron powder is released, and at the same time, the insulating layer is solidified to be glassy, so that a dust core having a predetermined shape is obtained. It is desirable that the above-described annealing process be performed in an atmosphere of an inert gas such as Ar or N.
【００２５】このようにして、本実施例で得られた高周
波用圧粉磁心は、その組織状態として軟磁性粉末１のそ
れぞれが、ガラス状絶縁層２で分離されているので、絶
縁性及び磁束密度を向上することができるとともに、う
ず電流の発生を防止できる。As described above, since the soft magnetic powder 1 is separated by the glassy insulating layer 2 in the structure state of the powder magnetic core for high frequency obtained in this embodiment, the insulating property and the magnetic flux The density can be improved and the generation of eddy current can be prevented.
【００２６】そして、本実施例では、上記絶縁層２の構
成元素として、Ｐ，Ｍｇ，Ｂ，Ｆｅを必須としたので、
上述のＣｒ公害の問題を解消しながら、該絶縁層２の耐
熱性を従来の水ガラス，樹脂等の場合に比べて向上で
き、そのため粉末形成時に軟磁性粉末内部に発生する歪
を開放させるために必要な温度まで加熱できる。その結
果、水ガラス等の無機バインダーを用いた場合のよう
に、保磁力の減少を図ることが困難であるという問題も
解消でき、高周波域での鉄損値が小さくなり、使用可能
な周波数帯域を拡大できる。In this embodiment, P, Mg, B, and Fe are essential as constituent elements of the insulating layer 2.
The heat resistance of the insulating layer 2 can be improved as compared with the conventional case of water glass, resin or the like while solving the problem of the Cr pollution described above, so that the strain generated inside the soft magnetic powder during powder formation is released. To the required temperature. As a result, it is possible to solve the problem that it is difficult to reduce the coercive force, as in the case where an inorganic binder such as water glass is used. Can be expanded.
【００２７】また、上記粉末を有機系絶縁バインダで被
覆していないので、材料の耐熱性や絶縁特性が構成する
樹脂特性に支配されるという問題も解消できる。Further, since the above-mentioned powder is not coated with the organic insulating binder, the problem that the heat resistance and the insulating properties of the material are governed by the properties of the constituent resin can be solved.
【００２８】また、本実施例では、軟磁性粉末を双ロー
ルやボールミルで偏平度１〜６に加工したので、反磁界
係数を低減でき、磁気特性を向上できる効果がある。さ
らに、高周波電流は金属導体の表面に集中し易いが、本
実施例では軟磁性粉末を６０メッシュアンダーと微粉化
したので、鉄損値の向上だけでなく、周波数特性を改善
できる。In this embodiment, since the soft magnetic powder is processed to a flatness of 1 to 6 by a twin roll or ball mill, the demagnetizing field coefficient can be reduced and the magnetic properties can be improved. Further, the high frequency current tends to concentrate on the surface of the metal conductor, but in this embodiment, the soft magnetic powder is pulverized to 60 mesh under, so that not only the iron loss value but also the frequency characteristics can be improved.
【００２９】図３ないし図５はそれぞれ本発明の効果を
確認するために行った実験結果を説明するための特性図
である。図３は、高純度鉄粉１００ｇに対して処理液の
添加量を０．０５〜１０ｃｃと変化させた場合の交流初
透磁率の周波数依存性を示す図である。図中、特性曲線
（１）◎印は処理量０．０５ｃｃとした試料、特性曲線
（２）●印は処理量０．１ｃｃとした試料、特性曲線
（３）▲印は０．３ｃｃとした試料、特性曲線（４）○
印は１ｃｃとした試料、特性曲線（５）△印は３ｃｃと
した試料、特性曲線（６）□印は５ｃｃとした試料、特
性曲線（７）▽印は１０ｃｃとした試料をそれぞれ示
す。FIGS. 3 to 5 are characteristic diagrams for explaining the results of experiments performed to confirm the effects of the present invention. FIG. 3 is a diagram showing the frequency dependence of the AC initial magnetic permeability when the amount of the processing solution added to 100 g of high-purity iron powder is changed from 0.05 to 10 cc. In the figure, the characteristic curve (1) ◎ indicates a sample with a processing amount of 0.05 cc, the characteristic curve (2) ● indicates a sample with a processing amount of 0.1 cc, and the characteristic curve (3) ▲ indicates a 0.3 cc. Sample, characteristic curve (4) ○
The mark indicates a sample of 1 cc, the characteristic curve (5) indicates a sample of 3 cc, the characteristic curve (6) indicates a sample of 5 cc, and the characteristic curve (7) indicates a sample of 10 cc.
【００３０】図３からも明らかなように、処理液量を
０．０５ｃｃ，０．１ｃｃとした試料（１），（２）で
は高い周波数域での透磁率の低下が大きく、絶縁効果は
認められるが安定性に劣る。また処理液量を１０ｃｃと
した試料（７）では安定性は良いものの透磁率のレベル
が低い。これに対して、処理液量を０．３〜５ｃｃとし
た試料（３）〜（６）の場合、周波数が高くなっても透
磁率のレベル，及び安定性とも良好な値になっている。As is clear from FIG. 3, in the samples (1) and (2) in which the treatment liquid volumes were 0.05 cc and 0.1 cc, the magnetic permeability in a high frequency range was greatly reduced, and the insulating effect was recognized. But poor stability. In sample (7) in which the amount of the processing solution was 10 cc, the stability was good, but the level of the magnetic permeability was low. On the other hand, in the case of the samples (3) to (6) in which the amount of the processing liquid is 0.3 to 5 cc, even when the frequency is increased, the level of the magnetic permeability and the stability are good.
【００３１】図４は、高純度鉄粉１００ｇに対して処理
液量１ｃｃとして処理し、これにイミド樹脂を湿式混合
によりコーティングした場合と、単に乾式混合した場合
との交流初透磁率の周波数依存性を示す図である。図
中、特性曲線（８）○印は、イミド樹脂を混合していな
い試料、特性曲線（９）△印は処理鉄粉ｖｆ９９％にイ
ミド樹脂をｖｆ１％湿式混合した後解粒した試料、特性
曲線（１０）□印は処理鉄粉ｖｆ９９％にイミド樹脂を
ｖｆ１％乾式混合した試料、特性曲線（１１）●印は処
理鉄粉ｖｆ９７％にイミド樹脂をｖｆ３％湿式混合した
後解粒した試料、特性曲線（１２）▽印は処理鉄粉ｖｆ
９５％にイミド樹脂をｖｆ５％湿式混合した後解粒した
試料をそれぞれ示す。FIG. 4 shows the frequency dependence of the initial magnetic permeability of AC between the case where 100 g of high-purity iron powder is treated with a treatment liquid amount of 1 cc and the imide resin is coated by wet mixing and the case where it is simply dry mixed. FIG. In the figure, the characteristic curve (8) 印 indicates a sample in which imide resin was not mixed, and the characteristic curve (9) △ indicates a sample obtained by wet-mixing treated iron powder vf99% with imide resin vf1% and then granulating. Curve (10) □ indicates a sample obtained by dry mixing imide resin vf1% with treated iron powder vf99%, and characteristic curve (11) indicates a sample obtained by wet mixing imide resin vf3% vf3% with treated iron powder vf97% and then granulated. , Characteristic curve (12) ▽ indicates treated iron powder vf
Samples obtained by wet mixing 95% of imide resin with 5% of vf and then pulverizing are shown.
【００３２】図４からも明らかなように、イミド樹脂を
混合していない試料（８）に対して、イミド樹脂量が増
えるほど透磁率のレベルは下がるものの、安定性は向上
している。また湿式混合した試料（９）と、乾式混合し
た試料（１０）とを比べると、湿式コーティングした方
が安定性が高いことがわかる。又、同じことが水ガラス
の場合においても言える。As is clear from FIG. 4, as compared with the sample (8) in which the imide resin is not mixed, as the amount of the imide resin increases, the level of the magnetic permeability decreases, but the stability is improved. Further, comparing the wet-mixed sample (9) with the dry-mixed sample (10), it can be seen that the stability is higher when wet-coated. The same can be said for water glass.
【００３３】図５は、高純度鉄粉の偏平化時間とアスペ
クト比（Ｄ／ｔ）との関係を示す特性図である。このア
スペクト比Ｄは、図に示すように、平均直径（Ｄ1 ＋Ｄ
2 ／２）／厚さｔであり、図中、試料（１３）はＤ／ｔ
比１．５、試料（１４）は３．５、試料（１５）は５．
０、試料（１６）は６．０、試料（１７）は３．２５試
料（１８）は２．５である。FIG. 5 is a characteristic diagram showing the relationship between the flattening time of high-purity iron powder and the aspect ratio (D / t). This aspect ratio D is, as shown in the figure, an average diameter (D 1 + D
2/2) / a thickness t, in the figure the sample (13) is D / t
Ratio 1.5, sample (14) is 3.5, sample (15) is 5.
0, sample (16) was 6.0, sample (17) was 3.25, sample (18) was 2.5.
【００３４】そして上記各試料（１３）〜（１８）の磁
束密度を測定した。その結果、試料（１３）は９０００
Ｇ、試料（１４）は１００００Ｇ、試料（１５）は１２
０００Ｇ、試料（１６）は１２０００Ｇ、試料（１７）
は１００００Ｇ、試料（１８）は８５００Ｇであった。
このようにアスペクト比を１〜６の範囲にすることによ
り、磁気特性が向上することがわかる。なかでも試料
（１４）〜（１６）の場合は磁束密度がさらに向上して
おり、偏平化による効果が認められる。The magnetic flux density of each of the samples (13) to (18) was measured. As a result, the sample (13) was 9000
G, sample (14) is 10,000 G, sample (15) is 12
000G, sample (16) is 12000G, sample (17)
Was 10,000 G, and the sample (18) was 8500 G.
It can be seen that setting the aspect ratio in the range of 1 to 6 improves the magnetic characteristics. Among them, in the case of samples (14) to (16), the magnetic flux density is further improved, and the effect of flattening is recognized.
【００３５】[0035]
【発明の効果】以上のように本発明に係る高周波用圧粉
磁心及びその製造方法によれば、軟磁性粉末をＰ，Ｍ
ｇ，Ｂ，Ｆｅを必須元素とするガラス状絶縁層で被覆し
たので、絶縁性及び磁束密度を向上でき、また耐熱性を
向上できることから鉄損を小さくできるとともに、使用
可能の周波数帯域を拡大できる効果がある。As described above, according to the high-frequency dust core and the method of manufacturing the same according to the present invention, the soft magnetic powder is formed of P, M
Since it is covered with a glassy insulating layer containing g, B, and Fe as essential elements, the insulating property and the magnetic flux density can be improved, and since the heat resistance can be improved, the iron loss can be reduced and the usable frequency band can be expanded. effective.
【図１】請求項１の発明の一実施例による高周波用圧粉
磁心を示す模式図である。FIG. 1 is a schematic view showing a high-frequency dust core according to an embodiment of the present invention;
【図２】請求項２の発明の一実施例による圧粉磁心の製
造方法の模式図である。FIG. 2 is a schematic view of a method for manufacturing a dust core according to an embodiment of the present invention.
【図３】本発明の効果を説明するための実験結果を示す
交流初透磁率と周波数との特性図である。FIG. 3 is a characteristic diagram of AC initial permeability and frequency showing experimental results for explaining the effect of the present invention.
【図４】本発明の実験結果を示す交流初透磁率と周波数
との特性図である。FIG. 4 is a characteristic diagram of AC initial permeability and frequency showing experimental results of the present invention.
【図５】本発明の実験結果を示す偏平化時間とアスペク
ト比との特性図である。FIG. 5 is a characteristic diagram showing a flattening time and an aspect ratio showing experimental results of the present invention.
１ 軟磁性粉末 ２ ガラス状絶縁層 1 soft magnetic powder 2 glassy insulating layer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 西本 英敏 兵庫県神戸市中央区脇浜町１丁目３番18 号 株式会社神戸製鋼所 神戸本社内 (56)参考文献 特開 昭50−28445（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hidetoshi Nishimoto 1-3-18 Wakihama-cho, Chuo-ku, Kobe City, Hyogo Prefecture Kobe Steel, Ltd. Kobe Head Office (56) References JP 50-28445 (JP, A)
Claims (4)
高周波用圧粉磁心において、上記軟磁性粉末がＰ，Ｍ
ｇ，Ｂ，Ｆｅを必須元素とするガラス状絶縁層で被覆さ
れていることを特徴とする高周波用圧粉磁心。1. A high frequency dust core obtained by dusting, bonding and solidifying soft magnetic powder, wherein the soft magnetic powder is P, M
A high frequency dust core, which is covered with a glassy insulating layer containing g, B and Fe as essential elements.
高周波用圧粉磁心の製造方法において、上記軟磁性粉末
と、Ｐ，Ｍｇ，Ｂ，Ｆｅを必須元素とするガラス状絶縁
剤とを混合するとともに該混合体を乾燥させて水分を除
去する第１工程と、該乾燥した混合体を粉末成形プレス
にて固化成形する第２工程と、該固化成形体を焼鈍する
第３工程とを備えたことを特徴とする高周波用圧粉磁心
の製造方法。2. A method for manufacturing a high-frequency dust core obtained by compacting, bonding and solidifying soft magnetic powder, wherein the soft magnetic powder and a glassy insulating material containing P, Mg, B and Fe as essential elements. , A first step of drying the mixture to remove moisture, a second step of solidifying the dried mixture with a powder molding press, and a third step of annealing the solidified body And a method for producing a high-frequency dust core.
れた軟磁性粉末に、エポキシ樹脂，イミド樹脂，あるい
はふっ素系樹脂からなる樹脂層を被覆形成したことを特
徴とする高周波用圧粉磁心。3. The high frequency dust core according to claim 1, wherein the soft magnetic powder coated with the insulating layer is coated with a resin layer made of an epoxy resin, an imide resin, or a fluororesin. .
上記ガラス状絶縁剤にエポキシ樹脂，イミド樹脂，ある
いはふっ素系樹脂の粉末を混合したことを特徴とする高
周波用圧粉磁心の製造方法。4. The method according to claim 2, wherein an epoxy resin, an imide resin, or a fluorine resin powder is mixed with the soft magnetic powder and the glassy insulating agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4649093A JP2710152B2 (en) | 1993-03-08 | 1993-03-08 | High frequency dust core and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4649093A JP2710152B2 (en) | 1993-03-08 | 1993-03-08 | High frequency dust core and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06260319A JPH06260319A (en) | 1994-09-16 |
| JP2710152B2 true JP2710152B2 (en) | 1998-02-10 |
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ID=12748662
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4649093A Expired - Lifetime JP2710152B2 (en) | 1993-03-08 | 1993-03-08 | High frequency dust core and manufacturing method thereof |
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| Country | Link |
|---|---|
| JP (1) | JP2710152B2 (en) |
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