JP2000021618A - Powder magnetic core - Google Patents
Powder magnetic coreInfo
- Publication number
- JP2000021618A JP2000021618A JP10204385A JP20438598A JP2000021618A JP 2000021618 A JP2000021618 A JP 2000021618A JP 10204385 A JP10204385 A JP 10204385A JP 20438598 A JP20438598 A JP 20438598A JP 2000021618 A JP2000021618 A JP 2000021618A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- soft magnetic
- binder
- metallic powder
- magnetic
- 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.)
- Pending
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
- H01F1/20—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 in the form of particles, e.g. powder
- H01F1/28—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 in the form of particles, e.g. powder dispersed or suspended in a bonding agent
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、チョークコイル等
に用いられる高性能な圧粉磁心に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-performance dust core used for a choke coil or the like.
【０００２】[0002]
【従来の技術】高周波で用いられるチョークコイルとし
て、フェライト磁心や圧粉磁心が使用されている。これ
らの内、フェライト磁心は、飽和磁束密度が小さいとい
う欠点を有している。これに対して、軟磁性金属粉末を
成形して作製される圧粉磁心は、軟磁性フェライトに比
べて著しく大きい飽和磁束密度を有するため、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 used as choke coils used at high frequencies. Among them, the ferrite core has a disadvantage that the saturation magnetic flux density is small. On the other hand, a dust core manufactured by molding a soft magnetic metal powder has an advantage that it has an excellent direct current superposition property because it has a significantly higher saturation magnetic flux density than soft magnetic ferrite. .
【０００３】しかし、圧粉磁心は、金属粉末を有機結合
剤等と混合し圧縮成形して作製するため、透磁率が低
く、また透磁率の高周波特性が悪いという欠点を有す
る。However, since the dust core is produced by mixing a metal powder with an organic binder or the like and compression-molding the powder core, it has a drawback of low magnetic permeability and poor high-frequency characteristics of the magnetic permeability.
【０００４】一方、近年の電子機器の小型化要請に伴う
電子部品の小型化の要求に対し、圧粉磁心の磁気特性に
対しても高特性化が強く望まれている。これは、圧粉磁
心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ているためであり、そのために
は、圧粉磁心の透磁率の向上、周波数特性の改善が必須
である。On the other hand, in response to the recent demand for downsizing of electronic components in accordance with the demand for downsizing of electronic devices, it is strongly desired to improve the magnetic properties of the dust core. This is because it is required that the inductance of the coil be equivalent while achieving the miniaturization of the dust core, and for that purpose, it is necessary to improve the permeability of the dust core and the frequency characteristics. It is.
【０００５】圧粉磁心の透磁率を向上させる方法とし
て、圧粉磁心を熱処理することが行われている。これ
は、圧粉磁心を成形する際に、成形による歪みが軟磁性
金属粉末に加えられ、残留して、透磁率が低下するた
め、この歪みを開放するためである。As a method for improving the magnetic permeability of a dust core, heat treatment of the dust core is performed. This is because when the powder magnetic core is formed, distortion due to the molding is added to the soft magnetic metal powder, and the soft magnetic metal powder remains to reduce the magnetic permeability, thereby releasing the distortion.
【０００６】[0006]
【発明が解決しようとする課題】しかし、熱処理による
軟磁性金属粉末の酸化により、透磁率が低下したり、有
機結合剤が熱により劣化し、軟磁性金属粉末間の導電性
が大きくなり、渦電流損失が増加し、透磁率の周波数特
性が劣化するという問題点がある。そのため、金属粉末
の表面に薄い酸化被膜が生成されるＦｅ−Ｓｉ−Ａｌ系
等の一部の圧粉磁心のみで適用されていた。However, the oxidation of the soft magnetic metal powder by the heat treatment lowers the magnetic permeability or the organic binder is deteriorated by the heat, so that the conductivity between the soft magnetic metal powders increases, There is a problem that current loss increases and frequency characteristics of magnetic permeability deteriorate. Therefore, it has been applied only to a part of dust cores such as Fe-Si-Al-based alloys in which a thin oxide film is formed on the surface of metal powder.
【０００７】本発明の目的は、高温での熱処理が可能
で、高い透磁率を有し、しかも高周波特性に優れた圧粉
磁心を提供することにある。An object of the present invention is to provide a dust core which can be heat-treated at a high temperature, has a high magnetic permeability, and is excellent in high-frequency characteristics.
【０００８】[0008]
【課題を解決するための手段】本発明者らは、高温での
熱処理可能な結合剤について鋭意検討した結果、耐熱性
ポリマー（高い耐熱性を持つ縮合複素環系高分子）であ
るポリイミド、ポリベンゾチアゾール、ポリベンゾオキ
サゾール、ポリベンゾイミダゾールのいずれかを用いる
ことが、有効であることを見出した。Means for Solving the Problems The present inventors have conducted intensive studies on binders that can be heat-treated at high temperatures, and as a result, have found that heat-resistant polymers (condensed heterocyclic polymers having high heat resistance) such as polyimide and It has been found that it is effective to use any of benzothiazole, polybenzoxazole and polybenzimidazole.
【０００９】即ち、本発明は、軟磁性金属粉末に結合剤
を加えて成形した圧粉磁心において、前記結合剤の主成
分としてポリイミド、ポリベンゾチアゾール、ポリベン
ゾオキサゾール、ポリベンゾイミダゾールのいずれかを
含有する圧粉磁心である。That is, the present invention provides a powder magnetic core formed by adding a binder to a soft magnetic metal powder, wherein any one of polyimide, polybenzothiazole, polybenzoxazole and polybenzimidazole is used as a main component of the binder. It is a dust core contained.
【００１０】[0010]
【発明の実施の形態】縮合複素環系高分子は、主鎖に芳
香環、複素環を持ち、結合解離エネルギーの大きな化学
結合と高分子主鎖の剛直化が図られ、高い耐熱性が得ら
れる。この高分子を圧粉磁心の結合剤として用いること
により、高い熱処理温度においても結合剤が劣化せず
に、軟磁性金属粉末を覆い、酸化を防ぎ、絶縁を保つこ
とが可能となり、結果として、透磁率の周波数特性を劣
化させずに、高い透磁率が得られる。BEST MODE FOR CARRYING OUT THE INVENTION A fused heterocyclic polymer has an aromatic ring and a heterocyclic ring in the main chain, and a chemical bond having a large bond dissociation energy and rigidity of the polymer main chain are achieved to obtain high heat resistance. Can be By using this polymer as a binder for the dust core, it is possible to cover the soft magnetic metal powder, prevent oxidation, and maintain insulation without deteriorating the binder even at a high heat treatment temperature. A high magnetic permeability can be obtained without deteriorating the frequency characteristics of the magnetic permeability.
【００１１】縮合複素環系高分子は、軟磁性金属粉末と
の親和性が比較的高くないため、結合剤にカップリング
剤等の表面改質剤や潤滑剤を縮合複素環系高分子の５〜
１５ｗｔ％程度加えることが望ましい。Since the condensed heterocyclic polymer does not have a relatively high affinity for the soft magnetic metal powder, a surface modifier such as a coupling agent or a lubricant is used as a binder. ~
It is desirable to add about 15 wt%.
【００１２】結合剤の添加量が少ない場合、軟磁性金属
粉末を十分に被覆できず、絶縁性が低下する。一方、過
剰な場合、相対的に軟磁性金属粉末の充填率が下がり、
透磁率が低下する。最適な添加量は、使用する軟磁性金
属粉末の粒径、粒度分布により異なるが、２〜１５ｗｔ
％程度が望ましい。When the amount of the binder is small, the soft magnetic metal powder cannot be sufficiently coated, and the insulating property is lowered. On the other hand, if it is excessive, the filling rate of the soft magnetic metal powder relatively decreases,
Magnetic permeability decreases. The optimum addition amount varies depending on the particle size and particle size distribution of the soft magnetic metal powder to be used.
% Is desirable.
【００１３】本発明で用いられる軟磁性金属粉末として
は、鉄系の軟磁性金属の粒子からなる粉末を用いること
が好ましい。鉄系の軟磁性金属としては、Ｆｅ、Ｆｅ−
Ｓｉ−Ａｌ、Ｆｅ−Ｎｉ、Ｆｅ−Ｃｏ、Ｆｅ−Ｓｉ、Ｆ
ｅ−Ｐ、Ｆｅ−Ｍｏ−Ｎｉ等により、必要とされる磁気
特性に応じて選択される。As the soft magnetic metal powder used in the present invention, it is preferable to use a powder comprising iron-based soft magnetic metal particles. Fe-based soft magnetic metals include Fe, Fe-
Si-Al, Fe-Ni, Fe-Co, Fe-Si, F
It is selected according to the required magnetic characteristics by e-P, Fe-Mo-Ni, or the like.
【００１４】本発明で用いられる成形としては、圧縮成
形法、射出成形法等必要に応じて適時使用される。As the molding used in the present invention, a compression molding method, an injection molding method, or the like may be used as needed.
【００１５】[0015]
【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.
【００１６】水アトマイズ法にて鉄粉を得て、ふるい分
級により４０μｍ以下の粉末を得た。この粉末９０ｗｔ
％に対し、耐熱性の縮合複素環系高分子であるポリイミ
ド、ポリベンゾチアゾール、ポリベンゾオキサゾール、
ポリベンゾイミダゾール、９ｗｔ％とチタンカップリン
グ剤１ｗｔ％を有機溶媒で分散したものを加えて、十分
に混合した。この混合物を、外径２０ｍｍ、内径１０ｍ
ｍ、高さ６ｍｍの形状に成形圧力３ｔｏｎｆ／ｃｍ2、
金型温度１００℃で成形し、リング状の圧粉磁心を得
た。Iron powder was obtained by a water atomizing method, and powder having a size of 40 μm or less was obtained by sieving. 90wt of this powder
%, Polyimide, polybenzothiazole, polybenzoxazole, which are heat-resistant condensed heterocyclic polymers,
A polybenzimidazole (9 wt%) and a titanium coupling agent (1 wt%) dispersed in an organic solvent were added and mixed well. This mixture was prepared with an outer diameter of 20 mm and an inner diameter of 10 m.
m, forming pressure of 3 tonf / cm 2 into a shape with a height of 6 mm,
Molding was performed at a mold temperature of 100 ° C. to obtain a ring-shaped dust core.
【００１７】次に、この圧粉磁心に５０ｔｕｒｎの巻線
を施し、インピーダンスアナライザーで１ｋＨｚ〜４０
ＭＨｚの交流初透磁率の周波数特性を測定した。Next, a 50-turn winding is applied to the dust core, and the impedance is measured at 1 kHz to 40 kHz by an impedance analyzer.
The frequency characteristic of the AC initial magnetic permeability in MHz was measured.
【００１８】さらに、これらの圧粉磁心を５００℃で１
ｈｒ大気中で熱処理し、上記と同様に透磁率の周波数特
性を測定した。Further, these powder cores are heated at 500 ° C. for 1 hour.
Heat treatment was performed in an air atmosphere for one hour, and the frequency characteristics of the magnetic permeability were measured in the same manner as described above.
【００１９】比較例として、上記で作製した金属粉末を
用い、シリコーン樹脂９ｗｔ％とチタンカップリング剤
１ｗｔ％を有機溶媒で分散したものを加えて、十分に混
合した。上記と同様に成形し、熱処理前後の交流初透磁
率の周波数特性を測定した。これらの交流初透磁率の測
定結果を表１に示す。As a comparative example, using the metal powder prepared above, 9 wt% of a silicone resin and 1 wt% of a titanium coupling agent dispersed in an organic solvent were added and mixed well. It was molded in the same manner as above, and the frequency characteristics of the AC initial permeability before and after the heat treatment were measured. Table 1 shows the measurement results of the AC initial magnetic permeability.
【００２０】 [0020]
【００２１】表１によると、本発明は、熱処理により、
周波数特性の劣化なしに、透磁率が向上していることが
わかる。比較例では、熱処理により金属粉末が酸化し
て、低周波数での透磁率の回復が小さく、また、樹脂の
劣化による周波数特性の劣化がみられる。According to Table 1, the present invention is characterized by
It can be seen that the magnetic permeability is improved without deterioration of the frequency characteristics. In the comparative example, the metal powder is oxidized by the heat treatment, the recovery of the magnetic permeability at a low frequency is small, and the deterioration of the frequency characteristic due to the deterioration of the resin is observed.
【００２２】[0022]
【発明の効果】以上説明したように、本発明によれば、
従来不可能であった、高温での熱処理を可能とし、高い
透磁率で、しかも、高周波特性に優れた圧粉磁心を提供
することができる。従って、本発明は、工業上、極めて
有効である。As described above, according to the present invention,
It is possible to provide a powder magnetic core which can be heat-treated at a high temperature, has high magnetic permeability, and is excellent in high-frequency characteristics, which was impossible in the past. Therefore, the present invention is extremely effective industrially.
Claims (1)
た圧粉磁心において、前記結合剤の主成分としてポリイ
ミド、ポリベンゾチアゾール、ポリベンゾオキサゾー
ル、ポリベンゾイミダゾールのいずれかを含有すること
を特徴とする圧粉磁心。1. A dust core formed by adding a binder to a soft magnetic metal powder, wherein the binder contains any one of polyimide, polybenzothiazole, polybenzoxazole and polybenzimidazole as a main component of the binder. Dust core characterized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10204385A JP2000021618A (en) | 1998-07-03 | 1998-07-03 | Powder magnetic core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10204385A JP2000021618A (en) | 1998-07-03 | 1998-07-03 | Powder magnetic core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000021618A true JP2000021618A (en) | 2000-01-21 |
Family
ID=16489667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10204385A Pending JP2000021618A (en) | 1998-07-03 | 1998-07-03 | Powder magnetic core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000021618A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111019285A (en) * | 2019-12-05 | 2020-04-17 | 无锡睿穗电子材料科技有限公司 | High-frequency-band wave-absorbing material with flame-retardant and oxidation-resistant properties |
-
1998
- 1998-07-03 JP JP10204385A patent/JP2000021618A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111019285A (en) * | 2019-12-05 | 2020-04-17 | 无锡睿穗电子材料科技有限公司 | High-frequency-band wave-absorbing material with flame-retardant and oxidation-resistant properties |
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