JPH0374812A - Ferrite magnetic material - Google Patents
Ferrite magnetic materialInfo
- Publication number
- JPH0374812A JPH0374812A JP21088989A JP21088989A JPH0374812A JP H0374812 A JPH0374812 A JP H0374812A JP 21088989 A JP21088989 A JP 21088989A JP 21088989 A JP21088989 A JP 21088989A JP H0374812 A JPH0374812 A JP H0374812A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- ferrite magnetic
- ferrite
- magnetic
- highly crystalline
- 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
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 48
- 239000000696 magnetic material Substances 0.000 title claims abstract description 17
- 239000006247 magnetic powder Substances 0.000 claims abstract description 28
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 239000011347 resin Substances 0.000 claims abstract description 7
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 6
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 abstract description 10
- 230000035699 permeability Effects 0.000 abstract description 9
- 229910018605 Ni—Zn Inorganic materials 0.000 abstract description 3
- 238000002425 crystallisation Methods 0.000 abstract description 3
- 230000008025 crystallization Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 229910001035 Soft ferrite Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007716 flux method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、トランス、インダクタ、磁気ヘッド等の各種
電子部品に用いられるフェライト磁性体に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a ferrite magnetic material used in various electronic components such as transformers, inductors, and magnetic heads.
従来の技術
フェライト磁性粉末を熱硬化性樹脂あるいは熱可塑性樹
脂（以下、総じて樹脂と記す。）で結着してなるフェラ
イト磁性体では、所定形状に成形後、フェライトが反応
する程の高温の熱処理をしないため、高透磁率のフェラ
イト磁性体を得るためには用いるフェライト磁性粉末の
保磁力が小さいこと、また、成形体中のフェライト充て
ん率が高い（すなわち、フェライト磁性体の密度が大き
い）ことが必要となる。Conventional technology Ferrite magnetic materials made by bonding ferrite magnetic powder with thermosetting resin or thermoplastic resin (hereinafter collectively referred to as resin) require heat treatment at a high enough temperature that the ferrite reacts after being molded into a predetermined shape. In order to obtain a ferrite magnetic material with high magnetic permeability, the coercive force of the ferrite magnetic powder used must be small, and the ferrite filling rate in the compact must be high (that is, the density of the ferrite magnetic material is high). Is required.
第２図に従来のフェライト磁性体の微細構造の模式図を
示す。第２図において、６は高結晶性フェライト磁性粉
末５を結着する樹脂、７は空隙、８は高結晶性フェライ
ト磁性粉末５のボアである。FIG. 2 shows a schematic diagram of the microstructure of a conventional ferrite magnetic material. In FIG. 2, 6 is a resin that binds the highly crystalline ferrite magnetic powder 5, 7 is a gap, and 8 is a bore of the highly crystalline ferrite magnetic powder 5.
高結晶性フェライト磁性粉末５は、高温焼成で十分に結
晶化が進んでいるので保磁力は小さく、比較的高い透磁
率のフェライト磁性体を得ることができる。Since the highly crystalline ferrite magnetic powder 5 is sufficiently crystallized by high-temperature firing, the coercive force is small, and a ferrite magnetic material with relatively high magnetic permeability can be obtained.
発明が解決しようとする課題
しかしながら、結晶化が十分に進んでいるために塊状の
焼成物を粉砕する時にへき面破壊が生じやすく、一般に
、そのフェライト磁性粉末の形状は、第２図の高結晶性
フェライト磁性粉末５のように鋭い角を有する多面体と
なる。そのため、加圧成形時に高結晶性フェライト磁性
粉末５が十分充填されず、フェライト磁性体の密度が低
いという問題点を有していた。Problems to be Solved by the Invention However, since the crystallization is sufficiently advanced, cleavage fracture is likely to occur when the lump-like fired product is crushed, and the shape of the ferrite magnetic powder is generally the highly crystalline shape shown in Fig. 2. It becomes a polyhedron with sharp corners like the magnetic ferrite powder 5. Therefore, there was a problem in that the highly crystalline ferrite magnetic powder 5 was not sufficiently filled during pressure molding, and the density of the ferrite magnetic material was low.
本発明は上記従来の問題点を解決するもので、高密度化
することによって樹脂結着型で高透磁率のフェライト磁
性体を提供することを目的とする。The present invention solves the above-mentioned conventional problems, and aims to provide a resin-bonded ferrite magnetic body with high magnetic permeability by increasing the density.
課題を解決するための手段
この課題を解決するために本発明のフェライト磁性体は
、球状をなす高結晶性フェライト磁性粉末を樹脂で結着
した構成とするものである。Means for Solving the Problem In order to solve this problem, the ferrite magnetic body of the present invention has a structure in which spherical highly crystalline ferrite magnetic powder is bound with a resin.
作用
以上のように高結晶性フェライト磁性粉末の形状が球状
であるために加圧成形時に発生するフェライト磁性粉末
どうしの摩擦が小さくなる。そのために、成形体は高密
度化し、透磁率の高いフェライト磁性体を得ることが可
能となる。Effect As described above, since the highly crystalline ferrite magnetic powder has a spherical shape, the friction between the ferrite magnetic powders that occurs during pressure molding is reduced. Therefore, the compact has a high density, and it becomes possible to obtain a ferrite magnetic body with high magnetic permeability.
実施例 以下、本発明の実施側について説明する。Example The implementation side of the present invention will be explained below.
第１図は本発明のフェライト磁性体の微細構造の模式図
である。第１図において、２は高結晶性練状フェライト
磁性粉１を結着する熱硬化性あるいは熱可塑性の樹脂、
３は空隙、４は高結晶性球状フェライト磁性粉末１のボ
アである。FIG. 1 is a schematic diagram of the fine structure of the ferrite magnetic material of the present invention. In FIG. 1, 2 is a thermosetting or thermoplastic resin that binds the highly crystalline ferrite magnetic powder 1;
3 is a gap, and 4 is a bore of the highly crystalline spherical ferrite magnetic powder 1.
ここで使用する高結晶性球状フェライト磁性粉末１は、
高温焼成で十分に結晶化が進んだものであって、通常は
９００℃以上で焼成したものが好ましい。The highly crystalline spherical ferrite magnetic powder 1 used here is:
It is preferable that the crystallization progresses sufficiently through high-temperature firing, and that firing at 900° C. or higher is usually preferable.
軟質フェライト磁性体を得たい場合は、高結晶性球状フ
ェライト磁性粉末１の保磁力が小さいほど良いので、磁
性粒子サイズが大きいほど望ましいが、一方、高結晶性
球状フェライト磁性粉末１の充填密度が下がるので実際
には１００〜２００μｍ径までが適している。If you want to obtain a soft ferrite magnetic material, the smaller the coercive force of the highly crystalline spherical ferrite magnetic powder 1 is, the better, so the larger the magnetic particle size is, the better. In practice, a diameter of 100 to 200 μm is suitable.
以下、具体的な実施例について説明する。Hereinafter, specific examples will be described.
（実施例１） Ｆｅ２０３５０ｍｏ１％、Ｎｉ０Ｎ１０２Ｏ％。(Example 1) Fe20350mo1%, Ni0N102O%.
Ｚｎ０３０ｍｏ １％よりなる出発混合物をスプレード
ライヤ法によって造粒し、この球状に造粒された微細球
状混合物を１３２０℃で６時間焼成し、平均粒径７０μ
ｍのＮｉ−Ｚｎ系軟質フェライト焼成粉を準備した。こ
の粉末を走査型電子顕微鏡で観察したところ十分球状化
しており、Ｘ線解析した結果では軟質フェライト特有の
鋭いスピネル構造解析線が得られ、結晶性の非常に高い
球状フェライト磁性粉末であることを確認した。A starting mixture consisting of 1% Zn030mo was granulated by a spray dryer method, and this spherical granulated fine spherical mixture was fired at 1320°C for 6 hours to give an average particle size of 70μ.
m Ni-Zn based soft ferrite fired powder was prepared. When this powder was observed with a scanning electron microscope, it was found to be sufficiently spherical, and X-ray analysis revealed sharp spinel structure analysis lines unique to soft ferrite, indicating that it is a spherical ferrite magnetic powder with extremely high crystallinity. confirmed.
上記高結晶性フェライト磁性粉末に対してエポキシ樹脂
を７ｗｔ％混合し、造粒した。この時、エポキシ樹脂を
溶剤で希釈して粘性を低くすることによって成形密度を
高めることができる。この造粒粉を３ｔ／ａＩｒ圧力で
圧綿成形し、一定時間加熱し熱硬化させ、内径７ｍｎ＋
、外径１２間、厚さ３簡のりングコアを作成した（本発
明品）。7 wt % of epoxy resin was mixed with the above highly crystalline ferrite magnetic powder and granulated. At this time, the molding density can be increased by diluting the epoxy resin with a solvent to lower its viscosity. This granulated powder was compressed at a pressure of 3t/aIr, heated for a certain period of time to thermoset, and had an inner diameter of 7mm+.
A ring core with an outer diameter of 12 mm and a thickness of 3 mm was prepared (product of the present invention).
比較のため、上記フェライト粉末と同じ配合組成の出発
混合物を同一の温度プロセスで焼威し、できあがった塊
状の焼成粉を粉砕機で機械的に破砕し、平均粒径７０μ
ｍのＮｉ−Ｚｎ系軟質フェライト焼成粉を準備した。こ
の粉末を走査型電子顕微鏡で観察したところ、形状は鋭
い角を有する多面体をしており、Ｘ線解析した結果では
軟質フェライト特有の鋭いスピネル構造解析線が得られ
、結晶性の高いフェライト磁性粉末であることを確認し
た。For comparison, a starting mixture with the same composition as the above ferrite powder was burned in the same temperature process, and the resulting lumpy baked powder was mechanically crushed using a crusher to obtain an average particle size of 70μ.
m Ni-Zn based soft ferrite fired powder was prepared. When this powder was observed with a scanning electron microscope, it was found to have a polyhedral shape with sharp corners, and X-ray analysis revealed sharp spinel structural lines characteristic of soft ferrite, indicating that it is a highly crystalline ferrite magnetic powder. It was confirmed that
このフェライト磁性粉末を用いて、本発明品と同様にし
て、リングコアを得た（比較品）。Using this ferrite magnetic powder, a ring core was obtained in the same manner as the product of the present invention (comparative product).
本発明品および比較品の材料特性を第１表に示す。Table 1 shows the material properties of the inventive product and the comparative product.
本発明品は、同じ出発原料を同一の温度プロセスで焼成
したにもかかわらず、フェライト磁性粉末の形状が球状
であるために、比較品よりも密度が高くなり初透磁率、
飽和磁束密度ともに大きくなっている。Although the product of the present invention is made from the same starting materials and fired at the same temperature process, the ferrite magnetic powder has a spherical shape, so the density is higher than that of the comparative product, and the initial permeability is low.
Both the saturation magnetic flux density is large.
なお、上記実施例において、初透磁率の測定は、ＪＩＳ
規格（Ｃ２５６１）に準じ、まず前述のりングコアに絶
縁テープを一層巻いた後、線径０．２６ｍｍφの絶縁銅
線を全周にわたって一層巻いた試料を準備した。次にこ
の自己インダクタンスをマクスウェルブリッジで測定磁
界の強さが０．８ （Ａ／ｍ）以下にて測定し、これよ
り周波数１（ＭＨｚ）での初透磁率を算出した。In the above examples, the initial magnetic permeability was measured according to JIS
In accordance with the standard (C2561), a sample was prepared by first wrapping one layer of insulating tape around the aforementioned ring core, and then wrapping one layer of insulated copper wire with a wire diameter of 0.26 mmφ around the entire circumference. Next, this self-inductance was measured with a Maxwell bridge at a measurement magnetic field strength of 0.8 (A/m) or less, and the initial magnetic permeability at a frequency of 1 (MHz) was calculated from this.
また、飽和磁束密度はリングコアをＪＩＳ規格（Ｃ２５
６１）に準じ、磁気磁束法にて、１０（Ｏｅ）の磁場で
の磁束密度を測定した。In addition, the saturation magnetic flux density of the ring core is JIS standard (C25
61), the magnetic flux density in a magnetic field of 10 (Oe) was measured by the magnetic flux method.
発明の効果
以上のように本発明は、球状をなす高結晶性フェライト
磁性粉末を用いることによって、成形体の密度を高め透
磁率の高い優れた樹脂結着型のフェライト磁性体を実現
できるものである。Effects of the Invention As described above, the present invention makes it possible to realize an excellent resin-bonded ferrite magnetic body with increased density of a molded body and high magnetic permeability by using spherical highly crystalline ferrite magnetic powder. be.
第１図は、本発明のフェライト磁性体の一実施例を示す
微細構造の模式図、第２図は従来のフェライト磁性粉末
を用いたフェライト磁性体の微細構造の模式図である。
１・・・・・・高結晶性球状フェライト磁性粉末、２・
・・・・・樹脂、３・・・・・・空隙、４・・・・・・
ボア。FIG. 1 is a schematic diagram of the microstructure of an embodiment of the ferrite magnetic material of the present invention, and FIG. 2 is a schematic diagram of the microstructure of a ferrite magnetic material using conventional ferrite magnetic powder. 1... Highly crystalline spherical ferrite magnetic powder, 2...
...Resin, 3...Void, 4...
Boa.
Claims (1)
脂あるいは熱可塑性樹脂で結着したフェライト磁性体。A ferrite magnetic material made by bonding spherical highly crystalline ferrite magnetic powder with thermosetting resin or thermoplastic resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21088989A JPH0374812A (en) | 1989-08-16 | 1989-08-16 | Ferrite magnetic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21088989A JPH0374812A (en) | 1989-08-16 | 1989-08-16 | Ferrite magnetic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0374812A true JPH0374812A (en) | 1991-03-29 |
Family
ID=16596770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21088989A Pending JPH0374812A (en) | 1989-08-16 | 1989-08-16 | Ferrite magnetic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0374812A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0670472A1 (en) * | 1994-03-04 | 1995-09-06 | CTS Corporation | Rotary position sensor |
| EP0670471B1 (en) * | 1994-03-04 | 1998-11-25 | CTS Corporation | Throttle position sensor for an internal combustion engine |
| WO1999008083A1 (en) * | 1997-08-07 | 1999-02-18 | Koyo Seiko Co., Ltd. | Torque sensor |
| US6288534B1 (en) | 1999-02-10 | 2001-09-11 | Cts Corporation | Non-contacting throttle valve position sensor |
| JP2002305108A (en) * | 2000-04-28 | 2002-10-18 | Matsushita Electric Ind Co Ltd | Composite magnetic material, magnetic element and manufacturing method of them |
-
1989
- 1989-08-16 JP JP21088989A patent/JPH0374812A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0670472A1 (en) * | 1994-03-04 | 1995-09-06 | CTS Corporation | Rotary position sensor |
| US5798639A (en) * | 1994-03-04 | 1998-08-25 | Cts Corporation | Rotary position sensor with improved bearing tolerance |
| EP0670471B1 (en) * | 1994-03-04 | 1998-11-25 | CTS Corporation | Throttle position sensor for an internal combustion engine |
| WO1999008083A1 (en) * | 1997-08-07 | 1999-02-18 | Koyo Seiko Co., Ltd. | Torque sensor |
| US6288534B1 (en) | 1999-02-10 | 2001-09-11 | Cts Corporation | Non-contacting throttle valve position sensor |
| JP2002305108A (en) * | 2000-04-28 | 2002-10-18 | Matsushita Electric Ind Co Ltd | Composite magnetic material, magnetic element and manufacturing method of them |
| JP4684461B2 (en) * | 2000-04-28 | 2011-05-18 | パナソニック株式会社 | Method for manufacturing magnetic element |
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