JPH11176681A - Manufacture of dust core - Google Patents
Manufacture of dust coreInfo
- Publication number
- JPH11176681A JPH11176681A JP9364097A JP36409797A JPH11176681A JP H11176681 A JPH11176681 A JP H11176681A JP 9364097 A JP9364097 A JP 9364097A JP 36409797 A JP36409797 A JP 36409797A JP H11176681 A JPH11176681 A JP H11176681A
- Authority
- JP
- Japan
- Prior art keywords
- dust core
- alloy powder
- binder
- powder
- temperature
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—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 metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、コイル等に用いら
れる圧粉磁芯の製造方法に関する。The present invention relates to a method for manufacturing a dust core used for a coil or the like.
【０００２】[0002]
【従来の技術】高周波で用いられるコイルなどに、フェ
ライト磁芯や圧粉磁芯が多く使用されている。純鉄や磁
性合金からなる軟磁性金属粉末を圧粉成形して作製され
る圧粉磁芯は、軟磁性のフェライト磁芯に比べて、高い
飽和磁束密度を持つため、直流重畳性に優れているとい
う長所を有している。2. Description of the Related Art Ferrite cores and dust cores are often used for coils used at high frequencies. Powder magnetic cores made by compacting soft magnetic metal powders made of pure iron or magnetic alloys have a higher saturation magnetic flux density than soft magnetic ferrite cores, and therefore have excellent DC superposition. It has the advantage of being.
【０００３】しかし、圧粉磁芯は、軟磁性金属粉末と有
機バインダー等とを混合し、圧縮成型して作製されるた
め、透磁率は、あまり高くとれず、また、透磁率の周波
特性も、高い周波数帯域での減衰が大きいという問題が
ある。However, the dust core is made by mixing a soft magnetic metal powder and an organic binder and compression-molding, so that the magnetic permeability is not so high, and the frequency characteristic of the magnetic permeability is also low. However, there is a problem that attenuation in a high frequency band is large.
【０００４】一方、近年の電子機器の小型化要請に伴
い、電子部品の小型化の要求が強くなっている。この要
求は、コイルなどのインダクタンス素子の大部分を占め
る圧粉磁芯の磁気特性に対しても、高特性化が強く望ま
れている。例えば、圧粉磁芯の小型化を達成しつつ、コ
イルのインダクタンスは同等であることが要求されるこ
とも有り、その解決手段として、圧粉磁芯の透磁率の向
上及び周波数特性の改善が強く望まれている。On the other hand, with the recent demand for miniaturization of electronic devices, there is a strong demand for miniaturization of electronic components. This demand is strongly demanded to improve the magnetic properties of the dust core, which occupies most of the inductance elements such as coils. For example, while minimizing the dust core, it is sometimes required that the inductance of the coil is the same, and as a solution to this, improvement of the permeability of the dust core and improvement of the frequency characteristics are required. It is strongly desired.
【０００５】一般に、圧粉磁芯の透磁率を向上させる方
法は、大別して二点考えられ、原料である素材自体の
磁気特性、特に透磁率を改善する、充填率を上げる、
という方法である。[0005] In general, there are two methods for improving the magnetic permeability of a dust core, and the magnetic properties of the raw material itself, particularly the magnetic permeability, and the filling rate can be increased.
That is the method.
【０００６】原材料の組成としては、高周波特性の点か
ら鉄（Ｆｅ）、珪素（Ｓｉ）、アルミニウム（Ａｌ）系
の合金が多用されている。この材料を用いた磁芯の透磁
率を更に向上させる方法は、主として充填率の向上に主
点が置かれていた。その手段として、例えば、成形圧を
上げる方法、バインダー条件を種々変化させる方法、形
状、 粒度、組成等の異なる二つ以上の種類の粉末を配
合する方法等が検討されてきた。As the composition of raw materials, iron (Fe), silicon (Si), and aluminum (Al) based alloys are frequently used from the viewpoint of high frequency characteristics. The method of further improving the magnetic permeability of a magnetic core using this material has mainly focused on improving the filling rate. As the means, for example, a method of increasing a molding pressure, a method of variously changing binder conditions, a method of blending two or more types of powders having different shapes, particle sizes, compositions, and the like have been studied.
【０００７】[0007]
【発明が解決しようとする課題】しかし、前記した方法
による圧粉磁芯の透磁率の改善は、既に多くの検討がな
され、この方向での改善の効果は、あまり期待できない
状況にある。例えば、成形圧力を上げる方法にしても、
金型寿命の低下や、設備の大型化等、製造コストや安全
の面からも難しい状況に有る。However, many studies have already been made on the improvement of the magnetic permeability of the dust core by the above-mentioned method, and the effect of improvement in this direction cannot be expected much. For example, if you increase the molding pressure,
There are difficulties in terms of manufacturing cost and safety, such as shortening of the mold life and enlargement of equipment.
【０００８】従って、本発明の課題は、高い透磁率で、
しかも、高周波特性に優れた圧粉磁芯を容易に製造でき
る製造方法を提供することである。Accordingly, an object of the present invention is to provide a high magnetic permeability,
Moreover, it is an object of the present invention to provide a manufacturing method capable of easily manufacturing a dust core excellent in high-frequency characteristics.
【０００９】[0009]
【課題を解決するための手段】本発明は、前記課題を達
成するべく検討した結果、原料粉末として、比較的アス
ペクト比の高い所定の外形性状を有する合金粉末を用
い、しかも、その合金粉末を３００℃乃至９００℃の温
度範囲で保持する熱処理を行うことにより、圧粉磁芯の
透磁率が格段に向上することを見いだした。According to the present invention, as a result of investigations to achieve the above object, as the raw material powder, an alloy powder having a predetermined outer shape having a relatively high aspect ratio is used. It has been found that the magnetic permeability of the dust core is significantly improved by performing the heat treatment at a temperature in the range of 300 ° C. to 900 ° C.
【００１０】即ち、原料粉末である軟磁性合金粉末の偏
平化加工は、原料合金粉末における透磁率の向上に効果
を与えるが、他方で、圧粉磁心の充填率は、扁平化加工
を行わない従来法による粉末に比較すると低下してい
る。これは、偏平化処理中に多大な変形歪が原料合金粉
末に加わるために、原料合金粉末が加工硬化し、その結
果、原料合金粉末の成形性に悪影響を及ぼしているもの
と思われる。また、粉砕中の溶媒との反応により、表面
性状が変化していることも考えられる。That is, the flattening of the soft magnetic alloy powder, which is the raw material powder, has the effect of improving the magnetic permeability of the raw alloy powder, while the filling rate of the dust core does not perform the flattening. It is lower than that of the conventional powder. This is presumably because a large amount of deformation strain is applied to the raw alloy powder during the flattening treatment, so that the raw alloy powder is work-hardened, and as a result, the formability of the raw alloy powder is adversely affected. It is also conceivable that the surface properties have changed due to the reaction with the solvent during the pulverization.
【００１１】従って、本発明では、偏平状の合金粉末の
加工歪の除去と表面性状改質のため、３００℃乃至９０
０℃の範囲の処理温度で熱処理することにより、圧粉磁
心の粉末充填率が向上することを見いだした。その結
果、透磁率の向上に対して著しい効果が得られた。Therefore, in the present invention, in order to remove the processing strain and improve the surface properties of the flat alloy powder, the temperature is set to 300 ° C. to 90 ° C.
It has been found that heat treatment at a treatment temperature in the range of 0 ° C. improves the powder filling rate of the dust core. As a result, a remarkable effect was obtained on the improvement of the magnetic permeability.
【００１２】上記の透磁率向上の原因としては、原料合
金粉末の、扁平で高いアスペクト比を持つ外形性状と、
所定の温度による熱処理の相乗効果としての成形性の向
上による充填率の向上と、原料素材の透磁率が改善され
たためと思われる。The reasons for the above-mentioned improvement in the magnetic permeability include the flatness of the raw material alloy powder having a high aspect ratio and
This is probably because the synthesizing effect of the heat treatment at a predetermined temperature improves the formability as a result of the improvement in the formability and the magnetic permeability of the raw material.
【００１３】ここで、合金粉末の熱処理を酸素含有雰囲
気中で行うと、合金粉末の表面に絶縁層が形成され、透
磁率の周波数特性が改善される。また、成形時に加温し
た状態で行うことにより、さらに高透磁率の磁芯が得ら
れる。また、バインダー硬化を、成形体の寸法を拘束保
持したままで行うことにより、さらに透磁率の高い磁芯
が得られる。Here, when the heat treatment of the alloy powder is performed in an oxygen-containing atmosphere, an insulating layer is formed on the surface of the alloy powder, and the frequency characteristics of the magnetic permeability are improved. Further, by performing the heating in a state of being heated at the time of molding, a magnetic core having a higher magnetic permeability can be obtained. Further, by performing the binder curing while keeping the dimensions of the molded body constrained, a magnetic core having a higher magnetic permeability can be obtained.
【００１４】即ち、本発明は、鉄（Ｆｅ）、珪素（Ｓ
ｉ）、アルミニウム（Ａｌ）を主成分とし、平均のアス
ペクト比が５以上で、平均の短軸径が５０μｍ以下の合
金粉末とバインダーとを混合した圧粉磁芯成形用合金粉
末を、３００℃乃至９００℃の温度範囲で熱処理し、そ
の後この合金粉末を圧縮成形する圧粉磁芯の製造方法で
ある。That is, according to the present invention, iron (Fe), silicon (S
i) A powder magnetic core molding alloy powder obtained by mixing an aluminum (Al) -based alloy powder having an average aspect ratio of 5 or more and an average minor axis diameter of 50 μm or less and a binder at 300 ° C. This is a method for manufacturing a dust core in which a heat treatment is performed in a temperature range of from about 900 ° C. to about 900 ° C., and then the alloy powder is compression-molded.
【００１５】また、本発明は、合金粉末の熱処理を酸
素が含まれる雰囲気中で行う上記記載の圧粉磁芯の製
造方法である。Further, the present invention is the above-described method for producing a dust core, wherein the heat treatment of the alloy powder is performed in an atmosphere containing oxygen.
【００１６】また、本発明は、合金粉末を圧縮成形す
る工程を、室温（２０℃）からバインダーの硬化温度以
下の温度範囲で行う上記の何れかに記載の圧粉磁芯
の製造方法である。Further, the present invention is the method for producing a dust core according to any one of the above, wherein the step of compression-molding the alloy powder is performed in a temperature range from room temperature (20 ° C.) to a curing temperature of the binder or lower. .
【００１７】さらに、本発明は、バインダーの樹脂硬
化の工程を、成形体の形状、寸法を維持したまま行う上
記の何れかに記載の圧粉磁芯の製造方法である。Further, the present invention is the method for producing a dust core according to any one of the above, wherein the step of curing the resin of the binder is performed while maintaining the shape and dimensions of the molded body.
【００１８】[0018]
【発明の実施の形態】以下、本発明の実施の形態につい
て説明する。コイルなどのインダクタンス部品を構成す
る圧粉磁芯の製造において、原料となる軟磁性合金粉末
として、組成が鉄（Ｆｅ）、珪素（Ｓｉ）アルミニウム
（Ａｌ）を主成分として、その粉末粒子の外形が扁平状
に加工され、アスペクト比が５以上、平均の短軸径が５
０μｍ以下の粉末を用い、これを３００℃乃至９００℃
の範囲の温度で保持する熱処理を行い、その後、バイン
ダーと混合し、圧縮成形する圧粉磁芯の方法である。Embodiments of the present invention will be described below. In the production of powder magnetic cores constituting inductance parts such as coils, the composition of iron (Fe), silicon (Si), aluminum (Al) as a main component of soft magnetic alloy powder as a raw material, and the outer shape of the powder particles Is flattened, the aspect ratio is 5 or more, and the average minor axis diameter is 5
Using a powder having a particle size of 0 μm or less,
This is a method of a dust core in which heat treatment is performed at a temperature in the range described above, followed by mixing with a binder and compression molding.
【００１９】また、この合金粉末の熱処理時の雰囲気
を、酸素を含む雰囲気中で熱処理した原料粉末、例え
ば、大気中で熱処理した原料合金粉末を用いた圧粉磁芯
の製造方法である。Further, the present invention relates to a method for producing a dust core using a raw material powder heat-treated in an atmosphere containing oxygen, for example, a raw alloy powder heat-treated in the atmosphere.
【００２０】また、上記の製造方法において、圧粉成形
時に、使用されているバインダー用樹脂の硬化温度以下
の範囲に昇温して圧縮成形する圧粉磁芯の製造方法であ
る。Further, in the above-mentioned production method, there is provided a method for producing a dust core, wherein the temperature is raised to a temperature not higher than the curing temperature of the binder resin used and compression-molded.
【００２１】出発原料は、溶解法によるインゴットから
の粉砕粉、アトマイズ粉等、種々考えられるが、組成の
濃度分布が均一ならば、その粉末の製造方法には制限さ
れない。これら原料合金粉末は、ボールミル、アトライ
ター等で粉砕することにより、粉末のアスペクト比を自
由に変えることができ、さらに、粉砕時間の調整によ
り、アスペクト比は任意に変化させることができる。ア
スペクト比を５以上にし、粉末粒子の厚み（短軸径）を
５０μｍ以下にし、次に、その粉末を３００℃乃至９０
０℃の温度範囲で熱処理する。その粉末で圧粉磁芯を作
製することにより、高透磁率の圧粉磁心が製造できる。Various starting materials can be used, such as a powdered powder from an ingot and an atomized powder obtained by a dissolution method. However, the method for producing the powder is not limited as long as the concentration distribution of the composition is uniform. These raw material alloy powders can be freely changed in the aspect ratio of the powder by pulverizing them with a ball mill, an attritor or the like, and the aspect ratio can be arbitrarily changed by adjusting the pulverization time. The aspect ratio is set to 5 or more, the thickness (short axis diameter) of the powder particles is set to 50 μm or less.
Heat treatment is performed in a temperature range of 0 ° C. By manufacturing a dust core with the powder, a dust core having high magnetic permeability can be manufactured.
【００２２】しかも、原料合金粉末の熱処理を、酸素を
含む雰囲気中で行うことで、透磁率の周波数特性に優れ
た磁芯特性が得られる。Further, by performing the heat treatment of the raw material alloy powder in an atmosphere containing oxygen, it is possible to obtain magnetic core characteristics excellent in frequency characteristics of magnetic permeability.
【００２３】熱処理温度を３００℃以上に規定したの
は、３００℃以下では、加工歪の除去が充分でなく、ま
た、９００℃以下と規定したのは、９００℃以上になる
と、焼結による粒子間の結着により粉末の流動性が低下
し、成形体の粉末充填率が低下するためである。The reason why the heat treatment temperature is specified to be 300 ° C. or more is that when the temperature is 300 ° C. or less, the removal of processing strain is not sufficient. This is because the fluidity of the powder decreases due to the binding between them, and the powder filling rate of the molded body decreases.
【００２４】さらに、粉末成形時の初期の合金粉末の温
度（成形温度）を、室温以上バインダーの硬化温度以下
で行うことにより、さらに高透磁率の磁芯が得られる。
これは、温度の上昇と共にバインダーの流動性が向上す
るため、成形時の合金粉末間の摩擦が低減し粉末の充填
及び粉末の配向に好影響を及ぼしたためと思われる。Furthermore, by setting the temperature (forming temperature) of the alloy powder at the initial stage of powder forming at a temperature between room temperature and the curing temperature of the binder, a magnetic core having a higher magnetic permeability can be obtained.
This is presumably because the fluidity of the binder was improved as the temperature was increased, so that the friction between the alloy powders during molding was reduced, which had a favorable effect on the filling of the powder and the orientation of the powder.
【００２５】ここで、成形温度を室温（２０℃）以上で
使用されたバインダー樹脂の硬化温度以下の範囲に規定
したのは、バインダーの流動性は室温以上で向上し、硬
化温度以上では、バインダーの硬化が始まるため、流動
性が低下するためである。Here, the reason why the molding temperature is specified to be in the range of room temperature (20 ° C.) or higher and the curing temperature of the binder resin used is that the fluidity of the binder is improved at room temperature or higher, and the binder temperature is higher than the curing temperature. This is because the curing of the resin starts and the fluidity decreases.
【００２６】また、成形体のバインダー硬化を成形体の
外形、寸法を拘束保持したままで行うことによっても、
透磁率の向上が可能である。これは、高アスペクト比の
粉末で製造された成形体は、スプリングバックが大きい
ため、成形後のバインダー硬化を成形時の寸法を拘束保
持したまま行うことが、最終状態の圧粉磁芯の圧粉密度
の向上に非常に有効なためである。Further, by curing the binder of the molded body while keeping the outer shape and dimensions of the molded body constrained,
It is possible to improve the magnetic permeability. This is because compacts manufactured from powders with a high aspect ratio have a large springback, so that binder hardening after molding can be performed while restraining the dimensions at the time of molding. This is because it is very effective in improving the powder density.
【００２７】[0027]
【実施例】以下、本発明を実施例によって説明する。The present invention will be described below with reference to examples.
【００２８】（実施例１）アトマイズ法にて作製され、
組成比が残Ｆｅ-１０ｗｔ％Ｓｉ-５ｗｔ％Ａｌの合金の
粗粉を素材とし、ボールミルを使用して合金粉末の偏平
化処理を行った。ボールミル粉砕後に得られた合金粉末
の平均のアスペクト比は約２０であった。(Example 1)
A coarse powder of an alloy having a composition ratio of residual Fe-10 wt% Si-5 wt% Al was used as a raw material, and the alloy powder was flattened using a ball mill. The average aspect ratio of the alloy powder obtained after ball milling was about 20.
【００２９】次に、これら粉末を大気中、真空中、窒素
雰囲気中で各々５００℃で３０分間保持の熱処理を行っ
た。次に、シリコーン樹脂を３ｗｔ％混合し、外径２０
ｍｍ、内径１０ｍｍの金型を用い、成形温度を７０℃に
昇温して５ｔｏｎ／ｃｍ2で成形し、トロイダル形状の
圧粉磁芯を得た。Next, these powders were subjected to a heat treatment of holding at 500 ° C. for 30 minutes in the air, in a vacuum, and in a nitrogen atmosphere. Next, 3 wt% of a silicone resin was mixed, and an outer diameter of 20 wt.
Using a mold having a diameter of 10 mm and an inner diameter of 10 mm, the molding temperature was raised to 70 ° C., and the mixture was molded at 5 ton / cm 2 to obtain a toroidal dust core.
【００３０】次に、これらの圧粉磁芯を、１７０℃、２
時間大気中で熱処理を行い、バインダー硬化を行ない、
引き続き大気中７００℃、２時間熱処理を行った後、成
形体の粉末充填率を測定した。さらに、これらの磁芯に
対して巻線を施し、コイルを形成した。これを、インピ
ーダンスアナライザー（ＹＨＰ製４１９４Ａ）を用い
て、１０，１００ｋＨｚでのインダクタンスを測定し、
透磁率を求めた。これらの結果を、次に記す比較例の結
果と併せて、表１に示す。Next, these dust cores were heated at 170 ° C. for 2 hours.
Heat treatment in the air for a time, cure the binder,
Subsequently, after heat treatment was performed at 700 ° C. for 2 hours in the atmosphere, the powder filling ratio of the compact was measured. Further, winding was performed on these magnetic cores to form coils. The inductance at 10,100 kHz was measured using an impedance analyzer (4194A manufactured by YHP).
The magnetic permeability was determined. Table 1 shows these results together with the results of the comparative examples described below.
【００３１】比較例１は、実施例と全く同じ組成の合金
粉末を使用して、合金粉末の熱処理は行わず、本発明と
全く同じ方法で磁芯を作製した。比較例２は、実施例と
同じ組成で、アトマイズ加工上がりの原料粉末を、扁平
か処理も熱処理も行わず、本発明と全く同じ方法で圧縮
成形し、圧粉磁心を作製した。これらの比較例の試料の
圧粉磁芯についても、透磁率を測定し、その結果を表１
に示す。In Comparative Example 1, a magnetic core was produced in exactly the same manner as in the present invention, using an alloy powder having exactly the same composition as in the example, but without performing heat treatment on the alloy powder. In Comparative Example 2, a raw material powder having the same composition as that of Example and having been subjected to the atomization processing was compression-molded by the same method as in the present invention without performing flattening or heat treatment, thereby producing a dust core. The magnetic permeability of the dust cores of these comparative samples was also measured, and the results were shown in Table 1.
Shown in
【００３２】 [0032]
【００３３】表１から明らかなように、粉末を熱処理す
ることにより、圧粉磁芯の充填率及び透磁率が向上する
ことが分かる。また、雰囲気については、全ての条件で
効果が認められるが、周波数特性を考慮すると、大気中
で熱処理するのが最も良いことがわかる。As is clear from Table 1, it is understood that the heat treatment of the powder improves the filling ratio and the magnetic permeability of the dust core. The effect of the atmosphere can be recognized under all conditions, but it is understood that the heat treatment is best performed in the air in consideration of the frequency characteristics.
【００３４】（実施例２）実施例１で作製した原料合金
粉末から、平均のアスペクト比が３，５，７，１０，２
０の合金粉末を用意して、熱処理温度は、２００℃ない
し１０００℃までを１００℃刻みで大気中熱処理した。(Example 2) From the raw material alloy powder prepared in Example 1, the average aspect ratio was 3, 5, 7, 10, 2
An alloy powder of No. 0 was prepared, and heat treatment was performed in the atmosphere at a heat treatment temperature of 200 ° C. to 1000 ° C. in 100 ° C. increments.
【００３５】次に、熱処理したこの合金粉末を使用し、
実施例１と全く同じ条件で圧粉磁芯を作製し、バインダ
ー硬化及び熱処理を行った。その結果をアスペクト比が
２０の試料について、粉末の熱処理温度と透磁率（μ）
の関係を図１に示す。図１の結果より粉末の熱処理温度
が３００℃乃至９００℃の範囲で特性の向上が認められ
る。また、図示していないが、アスペクト比が５以上で
透磁率の改善があった。Next, using the heat-treated alloy powder,
A dust core was produced under exactly the same conditions as in Example 1, and binder hardening and heat treatment were performed. The results are shown for the sample having an aspect ratio of 20 and the heat treatment temperature and magnetic permeability (μ) of the powder.
Is shown in FIG. From the results shown in FIG. 1, it can be seen that the characteristics are improved when the heat treatment temperature of the powder is in the range of 300 ° C. to 900 ° C. Although not shown, the magnetic permeability was improved when the aspect ratio was 5 or more.
【００３６】以上、説明したように、アスペクト比の高
い、かつＦｅ−Ｓｉ−Ａｌ系合金粉末を予め３００℃乃
至９００℃の温度範囲で熱処理した粉末を原料とし、そ
の粉末で圧粉磁芯を作製することにより、高透磁率の磁
芯を作製することができた。この時、熱処理の雰囲気が
酸素を含む雰囲気で行うとき、周波数特性に優れた圧粉
磁心が得られた。また、成形を室温以上かつバインダー
の硬化温度以下の温度で成形することにより、更に高透
磁率の磁芯が得られ、またバインダーの硬化を磁芯の寸
法を拘束保持したまま行うことにより、さらに高透磁率
の磁芯が製造できた。As described above, as a raw material, a powder obtained by heat-treating a Fe—Si—Al-based alloy powder having a high aspect ratio in advance at a temperature in the range of 300 ° C. to 900 ° C. is used as a raw material. By manufacturing, a magnetic core having high magnetic permeability could be manufactured. At this time, when the heat treatment was performed in an atmosphere containing oxygen, a dust core excellent in frequency characteristics was obtained. Further, by molding at a temperature not lower than room temperature and not higher than the curing temperature of the binder, a magnetic core having a higher magnetic permeability can be obtained.Also, by performing the curing of the binder while keeping the dimensions of the magnetic core constrained, A magnetic core with high magnetic permeability was manufactured.
【００３７】[0037]
【発明の効果】以上、本発明によれば、高い透磁率と、
透磁率の周波数特性に優れた圧粉磁芯が得られる圧粉磁
芯の製造方法が提供できる。As described above, according to the present invention, high magnetic permeability,
A method for manufacturing a dust core that can provide a dust core having excellent magnetic permeability frequency characteristics can be provided.
【図１】本発明の実施例の圧粉磁芯の原料合金粉末の熱
処理温度と、１００ｋＨｚにおける磁芯の透磁率（μ）
との関係を示した図。FIG. 1 shows a heat treatment temperature of a raw material alloy powder of a dust core according to an embodiment of the present invention and a magnetic permeability (μ) at 100 kHz.
FIG.
Claims (4)
ム（Ａｌ）を主成分とし、平均のアスペクト比が５以上
で、平均の短軸径が５０μｍ以下の合金粉末とバインダ
ーとを混合した圧粉磁芯成形用合金粉末を、３００℃乃
至９００℃の温度範囲で保持する熱処理を行い、その
後、この合金粉末を圧縮成形することを特徴とする圧粉
磁芯の製造方法。1. An alloy powder containing iron (Fe), silicon (Si), and aluminum (Al) as main components, an average aspect ratio of 5 or more, and an average short axis diameter of 50 μm or less, and a binder. A method for producing a dust core, comprising: performing a heat treatment on the alloy powder for forming a dust core in a temperature range of 300 ° C. to 900 ° C .; and thereafter compressing the alloy powder.
気中で行うことを特徴とする請求項１記載の圧粉磁心の
製造方法。2. The method for manufacturing a dust core according to claim 1, wherein the heat treatment of the alloy powder is performed in an atmosphere containing oxygen.
らバインダーの硬化温度以下の温度範囲で行うことを特
徴とする請求項１、または請求項２のいずれかに記載の
圧粉磁芯の製造方法。3. The powder magnetic core according to claim 1, wherein the step of compression-molding the alloy powder is performed in a temperature range from room temperature to a curing temperature of the binder or lower. Production method.
の形状を維持したまま行うことを特徴とする請求項１か
ら請求項３のいずれかに記載の圧粉磁芯の製造方法。4. The method for producing a dust core according to claim 1, wherein the step of curing the binder resin is performed while maintaining the shape of the molded body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9364097A JPH11176681A (en) | 1997-12-16 | 1997-12-16 | Manufacture of dust core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9364097A JPH11176681A (en) | 1997-12-16 | 1997-12-16 | Manufacture of dust core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11176681A true JPH11176681A (en) | 1999-07-02 |
Family
ID=18480970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9364097A Withdrawn JPH11176681A (en) | 1997-12-16 | 1997-12-16 | Manufacture of dust core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11176681A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109215923A (en) * | 2017-06-29 | 2019-01-15 | Tdk株式会社 | Coil component and LC composite component |
-
1997
- 1997-12-16 JP JP9364097A patent/JPH11176681A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109215923A (en) * | 2017-06-29 | 2019-01-15 | Tdk株式会社 | Coil component and LC composite component |
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