JPH11126721A - Manufacture of dust core - Google Patents
Manufacture of dust coreInfo
- Publication number
- JPH11126721A JPH11126721A JP30972897A JP30972897A JPH11126721A JP H11126721 A JPH11126721 A JP H11126721A JP 30972897 A JP30972897 A JP 30972897A JP 30972897 A JP30972897 A JP 30972897A JP H11126721 A JPH11126721 A JP H11126721A
- Authority
- JP
- Japan
- Prior art keywords
- dispersant
- powder
- dust core
- ferromagnetic powder
- binder
- 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
- H01F1/032—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 hard-magnetic materials
- H01F1/04—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 hard-magnetic materials metals or alloys
- H01F1/06—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 hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/08—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 hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/083—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 hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Powder Metallurgy (AREA)
- Soft Magnetic Materials (AREA)
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
に用いられる圧粉磁心の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a dust core used for a choke coil or the like.
【０００２】[0002]
【従来の技術】従来より、強磁性粉に熱硬化性樹脂より
なるバインダーを混合した後、所定形状に成形する圧粉
磁心の製造方法がよく知られている。2. Description of the Related Art A method of manufacturing a dust core, in which a binder made of a thermosetting resin is mixed with a ferromagnetic powder and then molded into a predetermined shape, has been well known.
【０００３】従来は、鉄や鉄合金もしくはフェライト等
の強磁性粉と、シリコーン樹脂等の熱硬化性樹脂よりな
るバインダーとを混合し、バインダーによって被覆され
た強磁性粉を金型内に充填し、圧縮成形して成形体を形
成していた。Conventionally, ferromagnetic powder such as iron, iron alloy or ferrite and a binder made of a thermosetting resin such as silicone resin are mixed, and the ferromagnetic powder coated with the binder is filled in a mold. And compression molding to form a molded body.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
製造方法では、混合時や金型内への充填時に入り込んだ
気泡や、バインダーの一部が揮発した後の空隙等が、そ
のまま残りやすく、製造された圧粉磁芯内に残留してし
まうという欠点があった。However, according to the conventional manufacturing method, air bubbles that enter during mixing or filling in a mold and voids after a part of the binder is volatilized tend to remain as they are. However, there is a defect that the powder remains in the dust core.
【０００５】このため、従来の方法で製造された圧粉磁
心は、強度が低く、破損しやすいという問題があった。
また、成形体中の強磁性粉の粉末充填率（成形体中にお
ける強磁性粉の密度）が低く、透磁率等の磁気特性が低
いという問題があった。[0005] Therefore, there is a problem that the dust core manufactured by the conventional method has low strength and is easily broken.
In addition, there is a problem that the powder filling rate of the ferromagnetic powder in the compact (the density of the ferromagnetic powder in the compact) is low, and the magnetic properties such as the magnetic permeability are low.
【０００６】従って、本発明の課題は、強度、及び磁気
特性が向上した圧粉磁心の製造方法を提供することにあ
る。Accordingly, an object of the present invention is to provide a method for manufacturing a dust core having improved strength and magnetic properties.
【０００７】[0007]
【課題を解決するための手段】上記課題を達成するべ
く、本発明による圧粉磁心の製造方法は、強磁性粉を分
散剤で表面処理を施した後、熱硬化性樹脂よりなるバイ
ンダーを混合し、金型内で加圧成形して成形体を形成す
ることを特徴とする。In order to achieve the above object, a method of manufacturing a dust core according to the present invention comprises a step of subjecting a ferromagnetic powder to a surface treatment with a dispersant, and then mixing a binder made of a thermosetting resin. Then, it is characterized in that a molded article is formed by pressure molding in a mold.
【０００８】即ち、本発明は、強磁性粉に分散剤を用い
て表面処理を施した後、熱硬化性樹脂よりなるバインダ
ーを混合し、得られた混合粉を加圧成形する圧粉磁心の
製造方法である。That is, the present invention provides a powder magnetic core which is obtained by subjecting a ferromagnetic powder to a surface treatment using a dispersant, then mixing a binder made of a thermosetting resin, and pressing the obtained mixed powder under pressure. It is a manufacturing method.
【０００９】また、本発明は、前記分散剤が０.０５〜
５.０ｗｔ％、前記熱硬化性樹脂が０.１〜１０.０ｗｔ
％、前記強磁性粉が残部の配合比である上記の圧粉磁心
の製造方法である。In the present invention, the dispersant may be used in an amount of 0.05 to 5
5.0 wt%, the thermosetting resin is 0.1 to 10.0 wt%
%, Wherein the ferromagnetic powder is the mixing ratio of the balance.
【００１０】なお、分散剤の添加量は、０.０５〜５.０
ｗｔ％が好ましく、この範囲を外れると機械的強度等が
低下するため、好ましくない。また、熱硬化性樹脂の添
加量は、０.１〜１０.０ｗｔ％が好ましく、０.１ｗｔ
％未満の添加量においては、樹脂が粉末に十分に行き渡
らなくなるために成形できなくなり、また、１０.０ｗ
ｔ％を越えた添加量においては、透磁率等の磁気特性が
低下するため、好ましくない。[0010] The amount of the dispersant added is 0.05 to 5.0.
If the amount is out of this range, the mechanical strength and the like are undesirably reduced. Further, the addition amount of the thermosetting resin is preferably 0.1 to 10.0 wt%, and 0.1 wt%.
%, The resin cannot sufficiently spread to the powder, so that molding cannot be performed.
An addition amount exceeding t% is not preferable because magnetic properties such as magnetic permeability deteriorate.
【００１１】本発明の構成とすることにより、強磁性粉
間の磁気的凝集力が弱くなり、強磁性粉間へのバインダ
ーの回り込みが促進され、空隙部分の発生が抑制され
る。According to the constitution of the present invention, the magnetic cohesive force between the ferromagnetic powders is weakened, the wraparound of the binder between the ferromagnetic powders is promoted, and the generation of voids is suppressed.
【００１２】[0012]
【発明の実施の形態】まず、強磁性粉と分散剤とを混合
する。次に、バインダーを投入して、混合する。さら
に、強磁性粉とバインダーとの混合粉を金型内に充填し
た後、圧縮成形する。その後、成形体のバインダー硬化
を行う。大気中で、熱処理を行って、圧粉磁心を得る。DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a ferromagnetic powder and a dispersant are mixed. Next, a binder is charged and mixed. Further, after the mixed powder of the ferromagnetic powder and the binder is filled in the mold, the mixture is compression-molded. Then, the binder of the molded body is cured. Heat treatment is performed in the air to obtain a dust core.
【００１３】なお、分散剤として、オレフィン−マレイ
ン酸塩コポリマー、アクリル酸−マレイン酸塩コポリマ
ー、ポリアクリル酸塩等が使用可能である。As the dispersant, olefin-maleate copolymer, acrylic acid-maleate copolymer, polyacrylate and the like can be used.
【００１４】また、バインダーとしてシリコーン樹脂、
エポキシ樹脂、フェノール樹脂、ポリエステル樹脂、ジ
アリルフタレート樹脂、ポリアミド樹脂、ポリイミド樹
脂、ポリカーボネート樹脂等が使用可能である。Further, a silicone resin as a binder,
Epoxy resins, phenol resins, polyester resins, diallyl phthalate resins, polyamide resins, polyimide resins, polycarbonate resins, and the like can be used.
【００１５】[0015]
【実施例】以下、図１に沿って、本発明の一実施例にお
ける圧粉磁心の製造方法について説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a dust core according to an embodiment of the present invention will be described below with reference to FIG.
【００１６】本実施例では、強磁性粉として、ｂａｌＦ
ｅ−１０ｗｔ％Ｓｉ−５ｗｔ％Ａｌ合金粉（以降、合金
粉と表記する）、分散剤としてオレフィン−マレイン酸
塩コポリマー（以降、分散剤と表記する）、バインダー
としてシリコーン樹脂を用い、配合比は、分散剤を０〜
２０.０ｗｔ％、シリコーン樹脂を０.０２〜２０.０ｗ
ｔ％、残部を合金粉とした。In this embodiment, balF is used as the ferromagnetic powder.
e-10 wt% Si-5 wt% Al alloy powder (hereinafter, referred to as alloy powder), olefin-maleate copolymer (hereinafter, referred to as dispersant) as a dispersant, and silicone resin as a binder. 0 to dispersant
20.0wt%, silicone resin 0.02 ~ 20.0w
t%, and the balance was alloy powder.
【００１７】図１に示すように、まず、合金粉と分散剤
とを攪拌機等により約１時間攪拌、混合した。次に、シ
リコーン樹脂を投入して、上記と同様に約１時間攪拌、
混合した。さらに、合金粉と分散剤とシリコーン樹脂と
の混合粉を金型内に充填した後、室温で、５ｔｏｎ／ｃ
ｍ2で圧縮成形した。その後、得られた成形体を金型よ
り取り出して、恒温槽等により約１７０℃、２時間でバ
インダー硬化を行った。最後に、酸化性雰囲気である大
気中で、７００℃、２時間熱処理を行って、本実施例の
圧粉磁心を得た。As shown in FIG. 1, first, the alloy powder and the dispersant were stirred and mixed for about 1 hour with a stirrer or the like. Next, a silicone resin is charged and stirred for about 1 hour in the same manner as above,
Mixed. Furthermore, after filling the mixed powder of the alloy powder, the dispersant, and the silicone resin into the mold, the mixture is filled with 5 ton / c at room temperature.
It was compression molded at m 2 . Thereafter, the obtained molded body was taken out from the mold, and the binder was cured at about 170 ° C. for 2 hours in a thermostatic oven or the like. Finally, heat treatment was performed at 700 ° C. for 2 hours in the oxidizing atmosphere to obtain a dust core of this example.
【００１８】次に、以上のようにして作製された圧粉磁
心の機械的強度、成形体中の強磁性粉の粉末充填率、透
磁率を比較した。その結果を表１、表２に示した。表１
中、＊印は、従来例を示す。なお、透磁率は、測定を行
う圧粉磁心に対して巻線をし、ＹＨＰ製インピーダンス
アナライザー４１９４Ａを用いて、１００ｋＨｚでのイ
ンダクタンスを測定後、計算で求めた。Next, the mechanical strength, the powder filling rate of the ferromagnetic powder in the compact, and the magnetic permeability of the powder magnetic core produced as described above were compared. The results are shown in Tables 1 and 2. Table 1
In the figure, * indicates a conventional example. The magnetic permeability was determined by winding a winding around a powder magnetic core to be measured and measuring the inductance at 100 kHz using a YHP impedance analyzer 4194A.
【００１９】 [0019]
【００２０】 [0020]
【００２１】表１、表２より、分散剤が０.０５〜５.０
ｗｔ％、バインダーが０.１〜１０.０ｗｔ％の範囲で、
機械的強度、粉末充填率及び透磁率に優れていることが
わかる。According to Tables 1 and 2, the dispersant was 0.05 to 5.0.
wt%, binder in the range of 0.1 to 10.0 wt%,
It turns out that it is excellent in mechanical strength, powder filling rate, and magnetic permeability.
【００２２】以上、実施例に基づいて説明した通り、強
磁性粉を、予め、分散剤で表面処理を施すことにより、
成形体中の強磁性粉間へのバインダーの回り込みが促進
され、空隙率が減少し（充填率が向上され）、成形体中
における強磁性粉の密度が高くなった。従って、本発明
によれば、予め、分散剤で表面処理を施した強磁性粉の
バインダーによる結合が、上記表面処理を施さないもの
の結合より強化され、成形体の機械的強度が向上した。
また、上記密度が高くなったので、透磁率が大きくなり
圧粉磁心の磁気特性が改善された。また、本発明は、簡
単な方法により、上記の諸特性が向上するという利点を
有する。As described above with reference to the examples, by subjecting the ferromagnetic powder to a surface treatment with a dispersant in advance,
The wraparound of the binder between the ferromagnetic powders in the molded article was promoted, the porosity was reduced (the filling rate was improved), and the density of the ferromagnetic powder in the molded article was increased. Therefore, according to the present invention, the binding of the ferromagnetic powder, which has been previously surface-treated with a dispersant, by a binder is strengthened more than the binding of the non-surface-treated ferromagnetic powder, and the mechanical strength of the molded article is improved.
Further, since the density was increased, the magnetic permeability was increased, and the magnetic characteristics of the dust core were improved. Further, the present invention has an advantage that the above-mentioned various characteristics are improved by a simple method.
【００２３】[0023]
【発明の効果】従って、本発明によれば、強度、及び磁
気特性が向上した圧粉磁心の製造方法を提供することが
可能となった。Thus, according to the present invention, it has become possible to provide a method for manufacturing a dust core having improved strength and magnetic properties.
【図１】本発明の一実施例における圧粉磁心の製造工程
を示す図。FIG. 1 is a view showing a manufacturing process of a dust core according to one embodiment of the present invention.
Claims (2)
した後、熱硬化性樹脂よりなるバインダーを混合し、得
られた混合粉を加圧成形することを特徴とする圧粉磁心
の製造方法。1. A dust core characterized in that after a ferromagnetic powder is subjected to a surface treatment using a dispersant, a binder made of a thermosetting resin is mixed, and the resulting mixed powder is subjected to pressure molding. Manufacturing method.
記熱硬化性樹脂が０.１〜１０.０ｗｔ％、前記強磁性粉
が残部の配合比である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 composition according to claim 1, wherein the dispersant is 0.05 to 5.0 wt%, the thermosetting resin is 0.1 to 10.0 wt%, and the ferromagnetic powder is the balance. Item 3. The method for producing a dust core according to Item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30972897A JPH11126721A (en) | 1997-10-24 | 1997-10-24 | Manufacture of dust core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30972897A JPH11126721A (en) | 1997-10-24 | 1997-10-24 | Manufacture of dust core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11126721A true JPH11126721A (en) | 1999-05-11 |
Family
ID=17996589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30972897A Pending JPH11126721A (en) | 1997-10-24 | 1997-10-24 | Manufacture of dust core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11126721A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1167935A2 (en) * | 2000-06-30 | 2002-01-02 | Tokyo Sintered Metal Co., Ltd. | A magnetic core for a non-contact displacement sensor |
| WO2004015724A1 (en) * | 2002-08-07 | 2004-02-19 | Hitachi Powdered Metals Co., Ltd. | Dust core and process for producing the same |
| DE112008002226T5 (en) | 2007-04-20 | 2010-07-01 | Fine Sinter Co., Ltd., Kasugai-shi | Powder core, method of making the same, electric motor and reactor |
| JP2020013943A (en) * | 2018-07-20 | 2020-01-23 | 古河電子株式会社 | Casting liquid composition, method for producing molded product, and molded product |
| JPWO2021210477A1 (en) * | 2020-04-17 | 2021-10-21 | ||
| KR20220156443A (en) | 2021-05-18 | 2022-11-25 | 티디케이가부시기가이샤 | Coil-embedded magnetic core and coil device |
-
1997
- 1997-10-24 JP JP30972897A patent/JPH11126721A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1167935A2 (en) * | 2000-06-30 | 2002-01-02 | Tokyo Sintered Metal Co., Ltd. | A magnetic core for a non-contact displacement sensor |
| EP1167935A3 (en) * | 2000-06-30 | 2003-10-08 | Tokyo Sintered Metal Co., Ltd. | A magnetic core for a non-contact displacement sensor |
| WO2004015724A1 (en) * | 2002-08-07 | 2004-02-19 | Hitachi Powdered Metals Co., Ltd. | Dust core and process for producing the same |
| CN100350519C (en) * | 2002-08-07 | 2007-11-21 | 日立粉末冶金株式会社 | Dust core and process for producing the same |
| DE112008002226T5 (en) | 2007-04-20 | 2010-07-01 | Fine Sinter Co., Ltd., Kasugai-shi | Powder core, method of making the same, electric motor and reactor |
| JP2020013943A (en) * | 2018-07-20 | 2020-01-23 | 古河電子株式会社 | Casting liquid composition, method for producing molded product, and molded product |
| JPWO2021210477A1 (en) * | 2020-04-17 | 2021-10-21 | ||
| KR20220156443A (en) | 2021-05-18 | 2022-11-25 | 티디케이가부시기가이샤 | Coil-embedded magnetic core and coil device |
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