JPH02222106A - Manufacture of plastic ferrite - Google Patents
Manufacture of plastic ferriteInfo
- Publication number
- JPH02222106A JPH02222106A JP1042206A JP4220689A JPH02222106A JP H02222106 A JPH02222106 A JP H02222106A JP 1042206 A JP1042206 A JP 1042206A JP 4220689 A JP4220689 A JP 4220689A JP H02222106 A JPH02222106 A JP H02222106A
- Authority
- JP
- Japan
- Prior art keywords
- ferrite
- resin
- mixed
- granulated
- material mixture
- 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.)
- Granted
Links
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 58
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000011347 resin Substances 0.000 claims abstract description 24
- 229920005989 resin Polymers 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000001694 spray drying Methods 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 7
- 238000010304 firing Methods 0.000 claims description 5
- 239000012798 spherical particle Substances 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract description 2
- 239000010802 sludge Substances 0.000 abstract 2
- 238000010298 pulverizing process Methods 0.000 description 9
- 239000011162 core material Substances 0.000 description 5
- 238000005469 granulation Methods 0.000 description 4
- 230000003179 granulation Effects 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Landscapes
- Magnetic Ceramics (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、樹脂とフェライトから成る複合材料である、
プラスチックフェライトの製造方法に係るもので、特に
フェライト粉末の製造方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention is a composite material consisting of a resin and a ferrite.
The present invention relates to a method for producing plastic ferrite, and particularly to a method for producing ferrite powder.
電子部品の小型化、薄型化等の要求に応じるために、イ
ンダクタンス素子の磁芯等として、プラスチックフェラ
イトが用いられるようになっている。In order to meet the demand for smaller and thinner electronic components, plastic ferrites have come to be used as magnetic cores of inductance elements and the like.
このプラスチックフェライトは、セラミック焼成物の粉
末であるフェライト粉末と樹脂を混合して所望の形状に
成型される。This plastic ferrite is formed into a desired shape by mixing ferrite powder, which is a powder of ceramic fired product, with a resin.
フェライト粉末は、フェライト原料混合物を焼成した後
、ボールミル等で所望の粒径になるまで粉砕してから樹
脂と混合される。The ferrite powder is mixed with a resin after firing a ferrite raw material mixture and pulverizing it with a ball mill or the like to a desired particle size.
しかし、上記のようにして製造されたフェライト粉末を
用いたプラスチックフェライトは、材料特性が劣化し、
キューリー点が低くなったり、磁芯として用いたインダ
クタの直流重畳特性が劣化するなどの問題を生じている
。However, plastic ferrite made using ferrite powder produced as described above has deteriorated material properties.
Problems have arisen, such as the Curie point becoming lower and the direct current superimposition characteristics of the inductor used as the magnetic core deteriorating.
また、粒子形状が不均一のため、樹脂と混合したときの
分散性、流動性が劣化し、フェライトの含有量を多くで
きないという問題がある。Furthermore, since the particle shape is non-uniform, the dispersibility and fluidity when mixed with resin deteriorate, and there is a problem that the ferrite content cannot be increased.
本発明は、このような課題を解決し、特性の良好な磁芯
材料等を得ようとするものである。The present invention aims to solve these problems and obtain a magnetic core material etc. with good characteristics.
また、成型性の面でも良好なプラスチックフェライトを
得ようとするものである。Furthermore, the present invention aims to obtain a plastic ferrite that has good moldability.
本発明は、フェライト粉末を球形に造粒した後に、混合
、成型して、上記の課題を解決するものである。The present invention solves the above problems by granulating ferrite powder into a spherical shape, then mixing and molding the ferrite powder.
すなわち、フェライト粉末と樹脂を混合し、成型するプ
ラスチックフェライトの製造方法において、フェライト
原料混合物を含む泥漿を噴霧乾燥法によって球形に造粒
し、その粒子を焼成した後に樹脂と混合し、成型するこ
とに特徴を有するものである。That is, in a method for producing plastic ferrite in which ferrite powder and resin are mixed and molded, slurry containing a ferrite raw material mixture is granulated into a spherical shape by a spray drying method, the particles are fired, and then mixed with resin and molded. It has the following characteristics.
また、フェライト原料混合物を含む泥漿を噴霧乾燥法に
よって異なる径の球形に二種類以上造粒し、その粒子を
混合し、焼成した後に樹脂と混合し、成型することに特
徴を有するものである。In addition, it is characterized in that the slurry containing the ferrite raw material mixture is granulated into two or more types of spherical shapes with different diameters by a spray drying method, the particles are mixed, and after firing, they are mixed with a resin and molded.
更に、フェライト原料混合物を焼成し、粉砕したフェラ
イト粉末と、フェライト原料混合物を含む泥漿を噴霧乾
燥法によって球形に造粒して焼成したフェライト粉末を
混合し、樹脂と混合し、成型することに特徴を有するも
のである。Furthermore, the ferrite powder obtained by firing and pulverizing the ferrite raw material mixture and the ferrite powder obtained by granulating and firing the slurry containing the ferrite raw material mixture into a spherical shape by a spray drying method are mixed, mixed with resin, and molded. It has the following.
焼成したフェライトを粉砕することによる特性の劣化を
初透磁率（μｉａｃ ）の変化で示したのが第１図であ
る。粒径を小さくするために粉砕時間を長くすると、初
透磁率が小さくなることを示している。これは、粉砕に
よる磁気歪みの増加がフェライト粉末の磁気特性を劣化
させているものと考えられる。FIG. 1 shows the deterioration of properties due to pulverization of fired ferrite as a change in initial magnetic permeability (μiac). This shows that when the grinding time is increased to reduce the particle size, the initial magnetic permeability decreases. This is considered to be because the increase in magnetostriction caused by pulverization deteriorates the magnetic properties of the ferrite powder.
以下、本発明の実施例について説明する。比較のために
四つのサンプルを製造した。Examples of the present invention will be described below. Four samples were produced for comparison.
「サンプル１」スプレードライヤ造粒（二種類粒径８０
μ／ノズル法、粒径２０μ／デイスク法を７：３で混合
「サンプル２Ｊスプレードライヤ造粒（粒径２０μ／デ
イスク法）と粉砕（粒径５μ）を５＝５で混合
「サンプル３」スプレードライヤ造粒（粒径２０μ／デ
イスク法）と粉砕（粒径５μ）を３ニアで混合
「サンプル４」粉砕（粒径５μ）のみ〔比較例〕スプレ
ードライヤ造粒のノズル法は、フェライト原料混合物を
含む泥漿を噴霧乾燥させて、球形の粒子を形成するもの
で、比較的大きな球形の粒子を形成するのに適している
。ディスク法は回転する円板を用いて泥檗を遠心法によ
って球形の粒子に形成するものである。比較的小さい粒
子を形成するのに適しでいる。"Sample 1" Spray dryer granulation (2 types particle size 80
Sample 2J Spray dryer granulation (particle size 20μ/disk method) and pulverization (particle size 5μ) mixed in a ratio of 5:5 “Sample 3” Spray Dryer granulation (particle size 20μ/disk method) and pulverization (particle size 5μ) are mixed at 3-neare "Sample 4" Only pulverization (particle size 5μ) [Comparative example] The nozzle method of spray dryer granulation is used for ferrite raw material mixture This method is used to form spherical particles by spray-drying a slurry containing . The disk method uses a rotating disk to form mud into spherical particles by centrifugation. Suitable for forming relatively small particles.
球形に形成されたフェライトの粒子は炉で焼成し、フェ
ライト粉末を得た。The spherical ferrite particles were fired in a furnace to obtain ferrite powder.
一方、粉砕は焼成したフェライトをボールミルで約５μ
になるまで行った。On the other hand, the fired ferrite is crushed using a ball mill to approximately 5 μm.
I went until
それぞれ造粒されたフェライト粉末は樹脂（ＰＰＳ）と
混合され、トロイダル形状のコアに成型された。Each granulated ferrite powder was mixed with resin (PPS) and molded into a toroidal-shaped core.
」二記のようにして得られた各サンプルの樹脂面の特性
と磁性体材料としての磁気特性を表１に示す。Table 1 shows the characteristics of the resin surface and the magnetic properties as a magnetic material of each sample obtained as described above.
樹脂面では、サンプル１の特性が劣っているがこれは、
粒径が８０１！と大きくなっているためと考えられる。In terms of resin, the properties of sample 1 are inferior;
Particle size is 801! This is thought to be due to the large size.
粒径の小さいサンプル２とサンプル３はいずれも樹脂の
面における特性が向上していることを示している。Both Samples 2 and 3, which have small particle sizes, show improved properties in terms of resin.
磁気的な特性でみると、粉砕のみのサンプル４に比較し
て球形に造粒した他の三つのサンプルはいずれもＱが高
くなっている。この値はＩＯＭＩＩｚで測定したもので
ある。In terms of magnetic properties, the other three samples, which were granulated into spherical shapes, all had a higher Q than Sample 4, which was only pulverized. This value was measured with IOMIIz.
直流重畳特性はμの５％低下磁界で測定したもので、粉
砕のみによるサンプル４の１３．６０ｅに対して、球形
に造粒したサンプル１は１９．８０ｅと約４６％も高（
なっている。これにより、粉砕しないフェライト粉末を
用いることにより、大電力での使用が可能となり、また
磁気飽和が生じ難い小型の装置を得ることも可能となる
。The DC superimposition characteristics were measured in a magnetic field with a 5% reduction in μ, and compared to 13.60e for Sample 4, which was only pulverized, Sample 1, which was granulated into a spherical shape, had a value of 19.80e, which is approximately 46% higher (
It has become. As a result, by using ferrite powder that is not crushed, it becomes possible to use the device with high power, and it is also possible to obtain a compact device in which magnetic saturation is less likely to occur.
同様にキューリー点についても、粉砕を行ったものは低
くなっている。Similarly, the Curie point is lower for those that have undergone pulverization.
上記のように、球形に造粒したフェライト粉末を用いる
と、樹脂面、磁性材料面での特性を改善できる。初透磁
率を高めるためには、フェライトの充填率を高める必要
があるので、粒度配合（ブレンド）を行うことによって
充填率を高めることができる。As mentioned above, the use of spherically granulated ferrite powder can improve the properties of the resin and magnetic material. In order to increase the initial magnetic permeability, it is necessary to increase the filling rate of ferrite, so the filling rate can be increased by blending the particle sizes.
また、粉砕した粉末と混合しても特性を改善することが
できるが、混合する比率を高めると磁気的な特性を劣化
させるので、混合量を抑える必要がある。Further, the characteristics can be improved by mixing with pulverized powder, but increasing the mixing ratio deteriorates the magnetic characteristics, so it is necessary to suppress the mixing amount.
本発明によれば、フェライト粉末を球形にしたので、樹
脂への分散性が向上し、粒子間の摩擦が減少して流動性
が向上する。したがって、加工性に優れたプラスチック
フェライトを得ることができる。According to the present invention, since the ferrite powder is made spherical, its dispersibility in the resin is improved, friction between particles is reduced, and fluidity is improved. Therefore, plastic ferrite with excellent workability can be obtained.
また、粉砕による磁気歪みをなくすることができるため
、Ｑ、直流重畳特性等の磁気的な特性が改善され、イン
ダクタンス素子等の磁芯として優れたプラスチックフェ
ライトが得られる。Furthermore, since magnetic distortion caused by crushing can be eliminated, magnetic properties such as Q and DC superimposition properties are improved, and plastic ferrite excellent as a magnetic core for inductance elements and the like can be obtained.
第１図は粉砕時間と特性の劣化を示す説明図である。 FIG. 1 is an explanatory diagram showing the pulverization time and deterioration of characteristics.
Claims (4)
チックフェライトの製造方法において、フェライト原料
混合物を含む泥漿を噴霧乾燥法によって球形に造粒し、
その粒子を焼成した後に樹脂と混合し、成型することを
特徴とするプラスチックフェライトの製造方法。(1) In a method for producing plastic ferrite in which ferrite powder and resin are mixed and molded, slurry containing a ferrite raw material mixture is granulated into spherical shapes by a spray drying method,
A method for producing plastic ferrite, which comprises firing the particles, mixing them with a resin, and molding them.
チックフェライトの製造方法において、フェライト原料
混合物を含む泥漿を噴霧乾燥法によって異なる径の球形
に二種類以上造粒し、それぞれの粒子を焼成し、混合し
た後に樹脂と混合し、成型することを特徴とするプラス
チックフェライトの製造方法。(2) A method for producing plastic ferrite in which ferrite powder and resin are mixed and molded, in which a slurry containing a ferrite raw material mixture is granulated into two or more types of spherical shapes with different diameters by a spray drying method, and each particle is fired, A method for producing plastic ferrite, which comprises mixing it with a resin and then molding it.
ノズル法によりそれぞれ形成する請求項第２項記載のプ
ラスチックフェライトの製造方法。(3) The method for producing plastic ferrite according to claim 2, wherein particles of different diameters are formed respectively by a centrifugal method using a rotating disk and a pressurized nozzle method.
チックフェライトの製造方法において、フェライト原料
混合物を焼成し、粉砕したフェライト粉末と、フェライ
ト原料混合物を含む泥漿を噴霧乾燥法によって球形に造
粒して焼成したフェライト粉末を混合し、樹脂と混合し
、成型することを特徴とするプラスチックフェライトの
製造方法。(4) A method for producing plastic ferrite in which ferrite powder and resin are mixed and molded, in which the ferrite raw material mixture is fired and the pulverized ferrite powder and slurry containing the ferrite raw material mixture are granulated into spherical shapes by a spray drying method. A method for producing plastic ferrite, which comprises mixing fired ferrite powder, mixing with resin, and molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1042206A JPH0756846B2 (en) | 1989-02-22 | 1989-02-22 | Manufacturing method of plastic ferrite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1042206A JPH0756846B2 (en) | 1989-02-22 | 1989-02-22 | Manufacturing method of plastic ferrite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02222106A true JPH02222106A (en) | 1990-09-04 |
| JPH0756846B2 JPH0756846B2 (en) | 1995-06-14 |
Family
ID=12629541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1042206A Expired - Lifetime JPH0756846B2 (en) | 1989-02-22 | 1989-02-22 | Manufacturing method of plastic ferrite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0756846B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61242005A (en) * | 1985-04-19 | 1986-10-28 | Kanegafuchi Chem Ind Co Ltd | Soft magnetic material composition and molding method thereof |
-
1989
- 1989-02-22 JP JP1042206A patent/JPH0756846B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61242005A (en) * | 1985-04-19 | 1986-10-28 | Kanegafuchi Chem Ind Co Ltd | Soft magnetic material composition and molding method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0756846B2 (en) | 1995-06-14 |
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