JP2019065337A - 絶縁物被覆軟磁性粉末、圧粉磁心、磁性素子、電子機器および移動体 - Google Patents
絶縁物被覆軟磁性粉末、圧粉磁心、磁性素子、電子機器および移動体 Download PDFInfo
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- 229920006122 polyamide resin Polymers 0.000 description 1
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- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
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- 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
- H01F1/22—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 pressed, sintered, or bound together
- H01F1/24—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 pressed, sintered, or bound together the particles being insulated
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/16—Metallic particles coated with a non-metal
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
- C03C3/066—Glass compositions containing silica with less than 40% silica by weight containing boron containing zinc
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- C—CHEMISTRY; METALLURGY
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- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
- C03C8/02—Frit compositions, i.e. in a powdered or comminuted form
- C03C8/04—Frit compositions, i.e. in a powdered or comminuted form containing zinc
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
- G11B5/66—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers
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- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
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- B22F2301/00—Metallic composition of the powder or its coating
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- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
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- H01F17/04—Fixed inductances of the signal type with magnetic core
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Abstract
Description
本発明の絶縁物被覆軟磁性粉末は、軟磁性材料を含むコア部と、
前記コア部の表面に設けられ、Bi2O3を主成分とするガラス材料を含む絶縁層と、
を有し、
前記絶縁層におけるアルカリ金属の含有率が5モル%以下であることを特徴とする。
これにより、高温下での絶縁性が高い絶縁物被覆軟磁性粉末が得られる。
これにより、高温下での信頼性が高い圧粉磁心が得られる。
これにより、高温下での信頼性が高い磁性素子が得られる。
これにより、信頼性が高い電子機器が得られる。
これにより、信頼性が高い移動体が得られる。
まず、本実施形態に係る絶縁物被覆軟磁性粉末について説明する。
かかる一例の製造方法は、コア部2に対して、それより粒径の小さい絶縁性材料の粒子(以下、省略して「絶縁粒子」という。)を機械的に固着させる方法である。固着した絶縁粒子が絶縁層3を形成し、絶縁物被覆軟磁性粒子1が得られる。
図2および図3は、それぞれ粉末被覆装置の構成を示す縦断面図である。
コア部2は、軟磁性材料を含む粒子である。好ましくは軟磁性材料が主材料になっており、不純物が含まれていてもよい。
本実施形態では、この絶縁性材料としてBi2O3を主成分とするガラス材料を用いている。主成分とは、ガラス材料を占める成分(例えばガラス形成酸化物)のうち、含有率(モル%)が最も高い成分のことをいう。したがって、本実施形態に係るガラス材料では、Bi2O3の含有率が最も高い。
なお、副成分は、主成分に次いで含有率(モル%)が高い成分のことをいう。
まず、測定対象の絶縁物被覆軟磁性粉末0.8gをアルミナ製の円筒に充填する。そして、円筒の上下に真ちゅう製の電極を配置する。
なお、円筒の内部の横断面積は、円筒の内径を2r[cm]としたとき、πr2[cm2]で求めることができる。
次に、本実施形態に係る圧粉磁心および本実施形態に係る磁性素子について説明する。
<第1実施形態>
まず、第1実施形態に係る磁性素子を適用したチョークコイルについて説明する。
まず、絶縁物被覆軟磁性粉末と、結合材と、各種添加剤と、有機溶媒とを混合し、混合物を得る。
次に、第2実施形態に係る磁性素子を適用したチョークコイルについて説明する。
次いで、前記第1実施形態と同様に、この成形体に熱処理を施す。これにより、結合材を硬化させ、圧粉磁心21およびチョークコイル20が得られる。
次に、本実施形態に係る磁性素子を備える電子機器(本実施形態に係る電子機器)について、図6〜図8に基づき、詳細に説明する。
次に、本実施形態に係る磁性素子を備える移動体(本実施形態に係る移動体)について、図9に基づき説明する。
また、本発明においては、上述した実施形態に任意の構成物が付加されていてもよい。
1.絶縁物被覆軟磁性粉末の製造
(実施例1)
まず、水アトマイズ法により製造されたFe−3.5Si−4.5Cr系合金の金属粉末(金属粒子)を用意した。この金属粉末は、Crを4.5質量%、Siを3.5質量%の割合でそれぞれ含むFe基合金粉末である。なお、この金属粉末の平均粒径は10μmであった。
なお、計算により求めた絶縁層の平均厚さは10nmであった。
ガラス材料の条件を表1に示すように変更した以外は、実施例1と同様にして絶縁物被覆軟磁性粉末を得た。
ガラス材料の条件を表1に示すように変更した以外は、実施例1と同様にして絶縁物被覆軟磁性粉末を得た。
絶縁層の形成を省略した以外は、実施例1と同様にして絶縁物被覆軟磁性粉末を得た。
2.1 高温下における電気抵抗の測定
各実施例、各比較例および参考例の絶縁物被覆軟磁性粉末2gを内径8mmのアルミナ製の円筒型容器に充填した。そして、容器の上下に真ちゅう製の電極を配置した。
次に、デジタルフォースゲージを用いて上下の電極間に40kg/cm2の圧力を加えた。
次に、時間経過とともに、電極間の電気抵抗を繰り返し測定した。
各実施例、各比較例および参考例の絶縁物被覆軟磁性粉末2gを内径8mmのアルミナ製の円筒型容器に充填した。そして、容器の上下に真ちゅう製の電極を配置した。
Claims (8)
- 軟磁性材料を含むコア部と、
前記コア部の表面に設けられ、Bi2O3を主成分とするガラス材料を含む絶縁層と、
を有し、
前記絶縁層におけるアルカリ金属の含有率が5モル%以下であることを特徴とする絶縁物被覆軟磁性粉末。 - 前記ガラス材料は、ZnOおよびB2O3の少なくとも一方をさらに含む請求項1に記載の絶縁物被覆軟磁性粉末。
- 前記ガラス材料は、Bi2O3の含有率が40モル%以上80モル%以下である請求項1または2に記載の絶縁物被覆軟磁性粉末。
- 平均粒径が1μm以上50μm以下である請求項1ないし3のいずれか1項に記載の絶縁物被覆軟磁性粉末。
- 請求項1ないし4のいずれか1項に記載の絶縁物被覆軟磁性粉末を含むことを特徴とする圧粉磁心。
- 請求項5に記載の圧粉磁心を備えることを特徴とする磁性素子。
- 請求項6に記載の磁性素子を備えることを特徴とする電子機器。
- 請求項6に記載の磁性素子を備えることを特徴とする移動体。
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