JPH08236331A - Iron powder for high-frequency dust core and its manufacture - Google Patents
Iron powder for high-frequency dust core and its manufactureInfo
- Publication number
- JPH08236331A JPH08236331A JP7033591A JP3359195A JPH08236331A JP H08236331 A JPH08236331 A JP H08236331A JP 7033591 A JP7033591 A JP 7033591A JP 3359195 A JP3359195 A JP 3359195A JP H08236331 A JPH08236331 A JP H08236331A
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- Japan
- Prior art keywords
- iron powder
- powder
- frequency
- flattening
- ultrafine
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高周波用圧粉磁心用鉄
粉及びその製造方法に関し、詳細には、高周波リアクト
ル等に用いられる高周波用圧粉磁心の原料として用いら
れる鉄粉及びその製造方法に関し、特には、透磁率の高
い高周波用圧粉磁心を得るために好適な鉄粉及びその製
造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to iron powder for high-frequency powder magnetic cores and a method for producing the same, and more specifically, iron powder used as a raw material for high-frequency powder magnetic cores used in high-frequency reactors and the production thereof. More particularly, the present invention relates to an iron powder suitable for obtaining a high-frequency powder magnetic core having high magnetic permeability, and a method for producing the iron powder.
【０００２】[0002]
【従来の技術】近年、ＯＡ機器等の電気製品の発展に関
連し、各種電気機器に電源から流入するノイズを除去す
る必要性が増えてきている。かかるノイズ除去のための
機器の一つとして、高周波ノイズ除去用の圧粉磁心体で
あるノイズフィルターがあり、その原料鉄粉として電解
鉄粉が使用されていたが、電解鉄粉は高価額である等の
問題点がある。そこで、種々検討がなされ、その結果、
高周波リアクトルやノイズフィルター等に用いられる高
周波用圧粉磁心の原料鉄粉として、偏平形状のアトマイ
ズ鉄粉が提案されている（特開昭61-223101 号公報
等）。2. Description of the Related Art In recent years, in connection with the development of electric appliances such as office automation equipment, there is an increasing need to remove noise flowing from a power source into various electric equipment. As one of the devices for removing such noise, there is a noise filter that is a dust core for removing high frequency noise, and electrolytic iron powder was used as the raw iron powder, but electrolytic iron powder is expensive. There are problems such as certain. Therefore, various studies were made, and as a result,
A flat atomized iron powder has been proposed as a raw material iron powder for high-frequency dust cores used in high-frequency reactors, noise filters, etc. (Japanese Patent Laid-Open No. 61-223101, etc.).
【０００３】かかる偏平形状のアトマイズ鉄粉は、水ア
トマイズ鉄粉等のアトマイズ鉄粉を振動ボールミル等に
より偏平加工した後、アンモニア分解ガス等の還元雰囲
気中で歪み取り及び還元を兼ねた焼鈍を施すというプロ
セスにより製造される。Such flat atomized iron powder is subjected to flattening by atomizing iron powder such as water atomized iron powder by a vibrating ball mill or the like, and then subjected to annealing for reducing strain and reducing in a reducing atmosphere such as ammonia decomposition gas. It is manufactured by the process.
【０００４】[0004]
【発明が解決しようとする課題】ところで、電流容量の
大きい大型の圧粉磁心においては、その透磁率が重要な
因子であり、透磁率が大きいほど同一インダクタンスに
おいて形状を小型化でき且つコイル巻き数を減らすこと
ができる。ここで、前者の小型化は磁心の鉄損に起因す
る発熱量を低減できるメリットがあり、後者のコイル巻
き数の低減には鉄損による発熱を小さくでき且つ捲線に
要するコストを低減できるメリットがある。従って、透
磁率の向上は重要な課題となっている。By the way, in a large dust core having a large current capacity, its magnetic permeability is an important factor, and the larger the magnetic permeability, the smaller the size can be made with the same inductance and the number of coil windings. Can be reduced. Here, the former miniaturization has an advantage that the heat generation amount due to the iron loss of the magnetic core can be reduced, and the latter reduction of the number of coil turns has the advantage that the heat generation due to the iron loss can be reduced and the cost required for winding can be reduced. is there. Therefore, improvement of magnetic permeability has become an important issue.
【０００５】本発明は、このような事情に着目してなさ
れたものであって、その目的は、高周波用圧粉磁心の原
料鉄粉として前記従来の偏平形状のアトマイズ鉄粉を用
いて得られる高周波用圧粉磁心の場合に比し、高い透磁
率を有する高周波用圧粉磁心を得ることができる高周波
用圧粉磁心用鉄粉及びその製造方法を提供しようとする
ものである。The present invention has been made in view of such circumstances, and an object thereof is to obtain the conventional flat atomized iron powder as a raw material iron powder for a high frequency powder magnetic core. It is an object of the present invention to provide an iron powder for a high frequency powder magnetic core and a method for producing the same, which can obtain a high frequency powder magnetic core having a high magnetic permeability as compared with the case of a high frequency powder magnetic core.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る高周波用圧粉磁心用鉄粉及びその製造
方法は次のような構成としている。即ち、請求項１記載
の高周波用圧粉磁心用鉄粉は、水アトマイズ鉄粉を偏平
加工してなる鉄粉から偏平加工の際に発生した極微粉を
除去して残留する鉄粉に歪み取り及び還元焼鈍を施して
なることを特徴とする高周波用圧粉磁心用鉄粉である。
請求項２記載の高周波用圧粉磁心用鉄粉は、前記残留す
る鉄粉中の最大長さ25μm 以下の極微粉の占める割合が
10wt％以下である請求項１記載の高周波用圧粉磁心用鉄
粉である。In order to achieve the above object, the iron powder for high frequency dust core and the manufacturing method thereof according to the present invention have the following constitution. That is, the iron powder for a high-frequency dust core according to claim 1 is an iron powder obtained by flattening water-atomized iron powder. And iron powder for a high frequency powder magnetic core, characterized by being subjected to reduction annealing.
In the iron powder for a high-frequency dust core according to claim 2, the proportion of the ultrafine powder having a maximum length of 25 μm or less in the remaining iron powder is
The iron powder for a high frequency dust core according to claim 1, which is 10 wt% or less.
【０００７】請求項３記載の高周波用圧粉磁心用鉄粉の
製造方法は、水アトマイズ鉄粉を偏平加工する第１工程
と、該偏平加工の際に発生した極微粉を除去する第２工
程と、該極微粉の除去後に残留する鉄粉に歪み取りと還
元を兼ねた焼鈍を施す第３工程とを有することを特徴と
する高周波用圧粉磁心用鉄粉の製造方法である。請求項
４記載の高周波用圧粉磁心用鉄粉の製造方法は、前記極
微粉の除去後に残留する鉄粉中の最大長さ25μm 以下の
極微粉の占める割合を10wt％以下にする請求項３記載の
高周波用圧粉磁心用鉄粉の製造方法である。According to a third aspect of the present invention, there is provided a method for producing iron powder for high-frequency dust cores, comprising a first step of flattening water atomized iron powder and a second step of removing ultrafine powder generated during the flattening. And a third step of subjecting the iron powder remaining after the removal of the ultrafine powder to annealing that also serves as strain relief and reduction, and is a method for producing iron powder for a high frequency powder magnetic core. The method for producing iron powder for a high-frequency dust core according to claim 4, wherein the proportion of the ultrafine powder having a maximum length of 25 μm or less in the iron powder remaining after the removal of the ultrafine powder is 10 wt% or less. It is a method for producing the iron powder for a high-frequency dust core described.
【０００８】[0008]
【作用】本発明は、高純度組成が容易に得られる水アト
マイズ鉄粉を原料として種々の工程を経て高周波用圧粉
磁心用鉄粉を製作し、該鉄粉を用いて高周波用圧粉磁心
を製作し、該磁心の性能を調べ、その結果、水アトマイ
ズ鉄粉を偏平加工した後、該偏平加工の際に発生した極
微粉を除去してから残留する鉄粉に歪み取り及び還元焼
鈍を施すようにすると、高い透磁率を有する高周波用圧
粉磁心を得ることができる高周波用圧粉磁心用鉄粉が得
られるという知見を得、かかる知見に基づき完成された
ものである。The present invention uses water atomized iron powder, which can easily obtain a high-purity composition, as a raw material to produce iron powder for a high-frequency powder magnetic core through various processes, and uses the iron powder to produce a high-frequency powder magnetic core. Was manufactured, the performance of the magnetic core was investigated, and as a result, after flattening the water atomized iron powder, the ultrafine powder generated during the flattening was removed, and then the remaining iron powder was strained and subjected to reduction annealing. The present invention has been completed based on the finding that iron powder for a high-frequency powder magnetic core can be obtained which can obtain a high-frequency powder magnetic core having a high magnetic permeability.
【０００９】この内容をより詳細に以下説明する。前記
従来の偏平形状のアトマイズ鉄粉の如く、水アトマイズ
鉄粉を偏平加工した後、歪み取り及び還元焼鈍を施すこ
とにより得られる高周波用圧粉磁心用鉄粉においては、
偏平加工の際に発生した極微粉を含有している。This content will be described in more detail below. Like the conventional flattened atomized iron powder, after flattening the water atomized iron powder, in the high-frequency dust core iron powder obtained by subjecting to strain relief and reduction annealing,
Contains ultrafine powder generated during flattening.
【００１０】かかる偏平加工の際に発生する極微粉は、
粒子内に粒界を持たず、単結晶に近いものであり、且つ
粒子表面に硬い鉄酸化物を多く有するため、変形抵抗が
大きく、例えば図１に示す如く、平均粒径が小さくなる
ほど、強度が高く、従って変形抵抗が大きい。そのた
め、偏平加工の際に偏平加工され難い。又、極微粉であ
ること自体に起因して偏平加工され難い。それ故に、偏
平加工の際に発生した極微粉は、アスペクト比が１に近
く、例えば図２に示す如く、粒度で25μm の極微粉はア
スペクト比が１に近い。The ultrafine powder generated during such flattening is
Since there are no grain boundaries in the grains, the grains are close to single crystals, and there are many hard iron oxides on the grain surface, the deformation resistance is large. For example, as shown in FIG. 1, the smaller the average grain size, the stronger the strength. The deformation resistance is high. Therefore, it is difficult to flatten the flattening process. Further, it is difficult to be flattened due to the fact that it is an extremely fine powder. Therefore, the ultrafine powder generated during flattening has an aspect ratio close to 1, and for example, as shown in FIG. 2, the ultrafine powder having a particle size of 25 μm has an aspect ratio close to 1.
【００１１】このような極微粉を含有したままの状態の
鉄粉を成形用型に充填し、圧縮して高周波用圧粉磁心に
成形すると、成形の際の圧縮性が低下するので、得られ
る成形体（高周波用圧粉磁心）の密度が低く、該磁心の
内部に多くの磁気的空隙が生じ、そのため該磁心の透磁
率が低下する。又、高周波用圧粉磁心用原料鉄粉の形状
としてアスペクト比が小さい程、個々の粒子にはたらく
反磁界が大きく、そのため高周波用圧粉磁心としての透
磁率が小さくなる。If iron powder in the state of containing such ultrafine powder is filled in a molding die and compressed to form a high-frequency powder magnetic core, the compressibility at the time of molding is lowered, so that it is obtained. The density of the molded body (powder magnetic core for high frequency) is low, and many magnetic voids are generated inside the magnetic core, which reduces the magnetic permeability of the magnetic core. Further, the smaller the aspect ratio of the raw iron powder for a high-frequency powder magnetic core, the larger the demagnetizing field that acts on each particle, and the smaller the magnetic permeability of the high-frequency powder magnetic core.
【００１２】これに対し、水アトマイズ鉄粉を偏平加工
した後、該偏平加工の際に発生した極微粉を除去してか
ら残留する鉄粉に歪み取り及び還元焼鈍を施すようにす
ると、上記の如き高周波用圧粉磁心の透磁率低下を引き
起こす極微粉の含有量が少ないか、もしくはかかる極微
粉を殆ど含有しない高周波圧粉磁心用鉄粉となり、そし
て、該鉄粉によれば、密度が高く、しかもアスペクト比
の小さい鉄粉が少なくて高い透磁率を有する高周波用圧
粉磁心を得ることができることがわかった。On the other hand, after flattening the water atomized iron powder, removing the ultrafine powder generated during the flattening and then subjecting the remaining iron powder to strain relief and reduction annealing, As described above, the content of the ultrafine powder that causes a decrease in the magnetic permeability of the high-frequency dust core is low, or the iron powder for the high-frequency dust core contains almost no such ultrafine powder, and the iron powder has a high density. Moreover, it has been found that it is possible to obtain a high-frequency dust core having a high magnetic permeability with less iron powder having a small aspect ratio.
【００１３】そこで、かかる知見に基づき、本発明に係
る高周波用圧粉磁心用鉄粉は、水アトマイズ鉄粉を偏平
加工してなる鉄粉から偏平加工の際に発生した極微粉を
除去して残留する鉄粉に歪み取り及び還元焼鈍を施して
なることを特徴とする高周波用圧粉磁心用鉄粉としてい
るのである（請求項１記載の高周波用圧粉磁心用鉄
粉）。Therefore, based on such knowledge, the iron powder for high-frequency dust core according to the present invention is obtained by removing ultrafine powder generated during flattening from iron powder obtained by flattening water atomized iron powder. The residual iron powder is subjected to strain relief and reduction annealing to obtain an iron powder for a high-frequency powder magnetic core (claim 1).
【００１４】又、本発明に係る高周波用圧粉磁心用鉄粉
の製造方法は、水アトマイズ鉄粉を偏平加工する第１工
程と、該偏平加工の際に発生した極微粉を除去する第２
工程と、該極微粉の除去後に残留する鉄粉に歪み取りと
還元を兼ねた焼鈍を施す第３工程とを有するようにして
いるのである（請求項３記載の高周波用圧粉磁心用鉄粉
の製造方法）。The method of producing iron powder for high-frequency dust core according to the present invention comprises a first step of flattening water atomized iron powder and a second step of removing ultrafine powder generated during the flattening.
The iron powder remaining after the removal of the ultrafine powder is provided with a third step of performing annealing that also serves as strain relief and reduction (iron powder for high-frequency dust core according to claim 3). Manufacturing method).
【００１５】ここで、偏平加工の際に発生した極微粉の
除去を、歪み取り及び還元焼鈍の後ではなく、該焼鈍の
前に行うようにしているのは、次の２点の理由による。
第１に、該焼鈍の後に極微粉の除去を行うようにする
と、該焼鈍の際に極微粉が偏平粉のまわりに焼結するた
め、該焼鈍後には極微粉の除去が極めて困難となるから
である。第２に、ヒステリシス損失の原因となる保磁力
を極力小さくするために焼鈍温度を高くして焼鈍する
際、極微粉が除去されずに存在していると、粉末（鉄
粉）全体が焼結固化し、引いては高周波用圧粉磁心の原
料粉（鉄粉）として使用できなくなるからである。The reason why the ultrafine powder generated during the flattening process is removed before the annealing, not after the strain relief and the reduction annealing is as follows.
First, if the ultrafine powder is removed after the annealing, the ultrafine powder will sinter around the flat powder during the annealing, which makes it extremely difficult to remove the ultrafine powder after the annealing. Is. Secondly, when the annealing temperature is raised to anneal to minimize the coercive force that causes the hysteresis loss, if the ultrafine powder is present without being removed, the entire powder (iron powder) is sintered. This is because it cannot be used as the raw material powder (iron powder) for the high frequency powder magnetic core after solidification.
【００１６】又、アトマイズ鉄粉には、水によりアトマ
イズしてなる鉄粉（水アトマイズ鉄粉）の他、不活性ガ
スによりアトマイズしてなる鉄粉等があるが、水アトマ
イズ鉄粉を用いるようにしているのは、水アトマイズは
他のアトマイズに比較して製造コストが安いからであ
る。The atomized iron powder includes iron powder atomized with water (water atomized iron powder) and iron powder atomized with an inert gas. The water atomized iron powder should be used. This is because water atomization has a lower manufacturing cost than other atomizations.
【００１７】本発明において、偏平加工の際に発生した
極微粉には、偏平加工前に水アトマイズ鉄粉に付着して
いた極微粉（水アトマイズ鉄粉）が偏平加工の際に剥が
れて脱落したもの、又は／及び、偏平加工により偏平状
となった鉄粉の縁の部分がちぎれたものがある。これら
極微粉の大きさは、極微粉最長部の長さで45μm 以下の
ものであり、これらは前記の如き高周波用圧粉磁心の透
磁率低下に影響を及ぼすが、小さいものほど該透磁率低
下に影響を及ぼし、45〜35μm のものよりも35〜25μm
のものの方が影響が大きく、特には25μm 以下のものが
大きな透磁率低下の要因となる。In the present invention, in the ultrafine powder generated during the flattening process, the ultrafine powder (water atomized iron powder) adhered to the water atomized iron powder before the flattening process was peeled off and dropped during the flattening process. There is a thing or / and one in which the edge portion of the iron powder which has been made flat by the flattening process is torn. The size of these ultrafine powders is such that the longest length of the ultrafine powder is 45 μm or less, and these affect the decrease in magnetic permeability of the high-frequency dust core as described above, but the smaller the size, the lower the magnetic permeability. Affects 35-25 μm than those of 45-35 μm
The one having a larger effect has a larger effect, and particularly the one having a thickness of 25 μm or less causes a large decrease in magnetic permeability.
【００１８】このような点から、前記極微粉の除去に際
しては、特には25μm 以下のものを除去することが望ま
しい。そして、前記極微粉の除去後に残留する鉄粉中の
最大長さ25μm 以下の極微粉の占める割合を10wt％以下
にすることが望ましい（請求項２記載の高周波用圧粉磁
心用鉄粉、請求項４記載の高周波用圧粉磁心用鉄粉の製
造方法）。そうすると、前記従来の偏平形状のアトマイ
ズ鉄粉の場合に比し、確実に高い透磁率を有する高周波
用圧粉磁心を得ることができる。更には、上記最大長さ
25μm 以下の極微粉の占める割合を７wt％以下にする
と、大幅に透磁率を高めることが可能となる。From this point of view, when removing the ultrafine powder, it is particularly desirable to remove the fine powder of 25 μm or less. Then, it is desirable that the ratio of the ultrafine powder having a maximum length of 25 μm or less in the iron powder remaining after the removal of the ultrafine powder is 10 wt% or less (iron powder for high-frequency dust core according to claim 2, claim Item 4. A method for producing iron powder for a high frequency dust core according to item 4. Then, as compared with the case of the conventional flattened atomized iron powder, it is possible to reliably obtain a high-frequency dust core having a high magnetic permeability. Furthermore, the maximum length above
If the proportion of the ultrafine powder of 25 μm or less is 7 wt% or less, the magnetic permeability can be significantly increased.
【００１９】前記偏平加工は、双ロールやボールミル等
を用いて行うことができる。前記極微粉の除去は、偏平
加工後の鉄粉を篩等にて分級する方法により行うことが
できる。The flattening process can be performed by using a twin roll or a ball mill. The removal of the ultrafine powder can be performed by a method of classifying the iron powder after flattening with a sieve or the like.
【００２０】前記歪み取りと還元を兼ねた焼鈍に際し、
焼鈍温度は700 〜900 ℃とすることが望ましい。それ
は、700 ℃未満とすると、歪みが残留し、引いては高周
波用圧粉磁心の磁気特性（透磁率）が低下する傾向にあ
り、900 ℃超にすると、粉末の焼結が起こり解砕が困難
となる傾向にあるからである。かかる歪み取りと還元を
兼ねた焼鈍は、アンモニア分解ガス等の還元雰囲気中で
加熱する方法により行うことができる。During the annealing for both strain relief and reduction,
The annealing temperature is preferably 700-900 ° C. If the temperature is lower than 700 ° C, the strain remains and eventually the magnetic properties (permeability) of the high frequency powder magnetic core tend to deteriorate. If the temperature exceeds 900 ° C, the powder is sintered and crushed. This is because it tends to be difficult. The annealing for both strain relief and reduction can be performed by a method of heating in a reducing atmosphere such as an ammonia decomposition gas.
【００２１】[0021]
【実施例】表１に示す組成及び粒度分布を有する水アト
マイズ鉄粉に対して、500kg/chの振動ボールミルにより
２時間の偏平加工を行った。該偏平加工後の鉄粉の粒度
分布を表２に示す。次に、該偏平加工後の鉄粉を45μm
の篩にて、(1) 100kg/Hr、(2) 50kg/Hr 、(3) 25kg/Hr
の三条件の処理スピードで分級を行った。各分級後の粒
度分布を表２に示す。EXAMPLES Water atomized iron powder having the composition and particle size distribution shown in Table 1 was subjected to flattening for 2 hours by a 500 kg / ch vibrating ball mill. Table 2 shows the particle size distribution of the iron powder after the flattening. Next, the iron powder after the flattening is 45 μm
(1) 100kg / Hr, (2) 50kg / Hr, (3) 25kg / Hr
Classification was performed at the processing speeds of the three conditions. Table 2 shows the particle size distribution after each classification.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【表２】 [Table 2]
【００２４】上記分級後の鉄粉に対して、歪み取りと還
元を兼ねた焼鈍として、アンモニア分解ガス中において
900 ℃で30分間加熱する熱処理を施した後、フェザーミ
ルにて解砕した。又、比較のため、前記偏平加工後の鉄
粉（分級せず）に対しても同様の熱処理及び解砕をし
た。The iron powder after the above classification was subjected to annealing for both strain relief and reduction in an ammonia decomposition gas.
After heat treatment of heating at 900 ° C. for 30 minutes, it was crushed with a feather mill. For comparison, the iron powder after flattening (without classification) was also subjected to the same heat treatment and crushing.
【００２５】このようにして得られた高周波用圧粉磁心
用鉄粉に対して、エポキシ樹脂粉末を10体積％混合し、
これを粉末成型プレスにより36Φ×24Φ×５t(mm) のリ
ング状に圧粉密度6.8g/cm3となるように圧粉成型した
後、160 ℃，１時間のキュア処理を行い、固化させ、高
周波用圧粉磁心としての磁気特性評価用サンプルを作製
した。これらサンプルについて、周波数１kHz , 印加磁
界Hm＝10〜100 Ｏe での交流透磁率を測定した。その結
果を図３に示す。図３及び表２から、偏平加工後に鉄粉
の分級をしなかった場合のものに比較し、偏平加工後に
鉄粉の分級をした場合のものは交流透磁率が高く、45〜
25μm 、25μm 以下の極微粉の量が少なくなるに伴って
交流透磁率が向上し、25μm 以下の極微粉の量でみる
と、それが10wt％以下のときに交流透磁率が向上し、特
に、25μm 以下の極微粉の量を10wt％未満にすることに
より交流透磁率を大幅に向上し得ることがわかる。10 volume% of epoxy resin powder was mixed with the iron powder for high frequency dust core thus obtained,
This was pressed into a ring shape of 36Φ x 24Φ x 5t (mm) with a powder molding press so that the powder density would be 6.8g / cm 3, and then cured at 160 ° C for 1 hour to solidify, A sample for magnetic property evaluation as a dust core for high frequency was prepared. The AC magnetic permeability of these samples was measured at a frequency of 1 kHz and an applied magnetic field Hm of 10 to 100 Oe. The result is shown in FIG. From FIG. 3 and Table 2, in comparison with the case where the iron powder was not classified after flattening, the case where the iron powder was classified after flattening had a high AC permeability,
AC magnetic permeability improves as the amount of ultrafine powder of 25 μm and 25 μm or less decreases.According to the amount of ultrafine powder of 25 μm or less, AC magnetic permeability improves when it is 10 wt% or less. It can be seen that the AC magnetic permeability can be significantly improved by setting the amount of ultrafine particles of 25 μm or less to less than 10 wt%.
【００２６】[0026]
【発明の効果】本発明に係る高周波用圧粉磁心用鉄粉に
よれば、密度が高く、しかもアスペクト比の小さい鉄粉
が少なくて高い透磁率を有する高周波用圧粉磁心を得る
ことができる。又、本発明に係る高周波用圧粉磁心用鉄
粉の製造方法によれば、上記の如き高透磁率を有する高
周波用圧粉磁心を得ることができる高周波用圧粉磁心用
鉄粉を製造し得る。According to the iron powder for a high frequency powder magnetic core of the present invention, it is possible to obtain a high frequency powder magnetic core having a high density and a small amount of iron powder having a small aspect ratio and a high magnetic permeability. . Further, according to the method for producing an iron powder for a high-frequency dust core according to the present invention, it is possible to obtain a high-frequency dust core having a high magnetic permeability as described above, to produce a high-frequency dust core iron powder. obtain.
【図１】 鉄粉についての平均粒径と10％強度との関係
を示す図である。FIG. 1 is a diagram showing the relationship between the average particle size of iron powder and 10% strength.
【図２】 鉄粉についての粒度とアスペクト比との関係
を示す図である。FIG. 2 is a diagram showing a relationship between a particle size and an aspect ratio of iron powder.
【図３】 実施例に係る高周波用圧粉磁心についての印
加磁界Hmと交流透磁率との関係を示す図である。FIG. 3 is a diagram showing a relationship between an applied magnetic field Hm and an AC magnetic permeability of the high-frequency powder magnetic core according to the example.
Claims (4)
粉から偏平加工の際に発生した極微粉を除去して残留す
る鉄粉に歪み取り及び還元焼鈍を施してなることを特徴
とする高周波用圧粉磁心用鉄粉。1. An iron powder obtained by flattening water atomized iron powder, wherein ultrafine powder generated during flattening is removed, and residual iron powder is strain-relieved and reduction-annealed. Iron powder for high frequency powder magnetic core.
下の極微粉の占める割合が10wt％以下である請求項１記
載の高周波用圧粉磁心用鉄粉。2. The iron powder for a high frequency dust core according to claim 1, wherein the proportion of the ultrafine powder having a maximum length of 25 μm or less in the remaining iron powder is 10 wt% or less.
程と、該偏平加工の際に発生した極微粉を除去する第２
工程と、該極微粉の除去後に残留する鉄粉に歪み取りと
還元を兼ねた焼鈍を施す第３工程とを有することを特徴
とする高周波用圧粉磁心用鉄粉の製造方法。3. A first step of flattening water atomized iron powder, and a second step of removing ultrafine powder generated during the flattening.
A method for producing iron powder for a high frequency powder magnetic core, comprising: a step; and a third step of subjecting the iron powder remaining after the removal of the ultrafine powder to annealing that also serves as strain relief and reduction.
最大長さ25μm 以下の極微粉の占める割合を10wt％以下
にする請求項３記載の高周波用圧粉磁心用鉄粉の製造方
法。4. The method for producing iron powder for high-frequency dust core according to claim 3, wherein the proportion of the ultrafine powder having a maximum length of 25 μm or less in the iron powder remaining after the removal of the ultrafine powder is 10 wt% or less. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7033591A JPH08236331A (en) | 1995-02-22 | 1995-02-22 | Iron powder for high-frequency dust core and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7033591A JPH08236331A (en) | 1995-02-22 | 1995-02-22 | Iron powder for high-frequency dust core and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08236331A true JPH08236331A (en) | 1996-09-13 |
Family
ID=12390752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7033591A Withdrawn JPH08236331A (en) | 1995-02-22 | 1995-02-22 | Iron powder for high-frequency dust core and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08236331A (en) |
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|---|---|---|---|---|
| US7427909B2 (en) | 2003-06-12 | 2008-09-23 | Nec Tokin Corporation | Coil component and fabrication method of the same |
| JP2010258344A (en) * | 2009-04-28 | 2010-11-11 | Toyota Motor Corp | Method of manufacturing magnetic powder |
| WO2014054430A1 (en) * | 2012-10-03 | 2014-04-10 | 株式会社神戸製鋼所 | Soft magnetic mixed powder |
| JP2015092543A (en) * | 2013-10-01 | 2015-05-14 | 日東電工株式会社 | Soft magnetic particle powder, soft magnetic resin composition, soft magnetic film, soft magnetic film laminate circuit board and position detector |
| CN108044113A (en) * | 2018-01-25 | 2018-05-18 | 苏州思美特表面材料科技有限公司 | A kind of spherical and spherical metal powder crushes scattered method |
-
1995
- 1995-02-22 JP JP7033591A patent/JPH08236331A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7427909B2 (en) | 2003-06-12 | 2008-09-23 | Nec Tokin Corporation | Coil component and fabrication method of the same |
| JP2010258344A (en) * | 2009-04-28 | 2010-11-11 | Toyota Motor Corp | Method of manufacturing magnetic powder |
| WO2014054430A1 (en) * | 2012-10-03 | 2014-04-10 | 株式会社神戸製鋼所 | Soft magnetic mixed powder |
| JP2014090152A (en) * | 2012-10-03 | 2014-05-15 | Kobe Steel Ltd | Soft magnetic powder mixture |
| US9818519B2 (en) | 2012-10-03 | 2017-11-14 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Soft magnetic mixed powder |
| US20160211061A1 (en) | 2013-01-10 | 2016-07-21 | Nitto Denko Corporation | Soft magnetic particle powder, soft magnetic resin composition, soft magnetic film, soft magnetic film laminated circuit board, and position detection device |
| JP2015092543A (en) * | 2013-10-01 | 2015-05-14 | 日東電工株式会社 | Soft magnetic particle powder, soft magnetic resin composition, soft magnetic film, soft magnetic film laminate circuit board and position detector |
| US10418161B2 (en) | 2013-10-01 | 2019-09-17 | Nitto Denko Corporation | Soft magnetic particle powder, soft magnetic resin composition, soft magnetic film, soft magnetic film laminated circuit board, and position detection device |
| CN108044113A (en) * | 2018-01-25 | 2018-05-18 | 苏州思美特表面材料科技有限公司 | A kind of spherical and spherical metal powder crushes scattered method |
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