JPH02278702A - Ferrite particle for bond core and manufacture thereof - Google Patents
Ferrite particle for bond core and manufacture thereofInfo
- Publication number
- JPH02278702A JPH02278702A JP10120489A JP10120489A JPH02278702A JP H02278702 A JPH02278702 A JP H02278702A JP 10120489 A JP10120489 A JP 10120489A JP 10120489 A JP10120489 A JP 10120489A JP H02278702 A JPH02278702 A JP H02278702A
- Authority
- JP
- Japan
- Prior art keywords
- ferrite
- powder
- average particle
- particle size
- nickel
- 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
- 239000002245 particle Substances 0.000 title claims abstract description 79
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000000843 powder Substances 0.000 claims abstract description 51
- 230000035699 permeability Effects 0.000 claims abstract description 28
- 239000013078 crystal Substances 0.000 claims abstract description 19
- 239000008187 granular material Substances 0.000 claims abstract description 15
- 229910001053 Nickel-zinc ferrite Inorganic materials 0.000 claims abstract description 14
- 239000012798 spherical particle Substances 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 239000004094 surface-active agent Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 16
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 239000011812 mixed powder Substances 0.000 claims description 11
- 239000011787 zinc oxide Substances 0.000 claims description 4
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 3
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 2
- 239000007858 starting material Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 13
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 239000011162 core material Substances 0.000 description 38
- 239000000696 magnetic material Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 7
- 238000010304 firing Methods 0.000 description 7
- 239000011148 porous material Substances 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000001694 spray drying Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 241000722946 Acanthocybium solandri Species 0.000 description 1
- 229910002588 FeOOH Inorganic materials 0.000 description 1
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- -1 amine salt Chemical class 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 150000007942 carboxylates Chemical class 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 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、ボンド磁心用フェライト粒子粉末及びその製
造法に関するものであり、詳しくは、平均粒径が５〜１
５μｍの結晶粒によって形成されている平均粒子径２０
〜１５０μｍのニッケル・亜鉛フェライト球状粒子粉末
であり、且つ透磁率が２５以上であるボンド磁心用フェ
ライト粒子粉末及びその製造法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 particle powder for bonded magnetic cores and a method for producing the same.
Average particle size 20 formed by crystal grains of 5 μm
The present invention relates to a ferrite particle powder for a bonded magnetic core, which is a nickel-zinc ferrite spherical particle powder of ~150 μm and a magnetic permeability of 25 or more, and a method for producing the same.
本発明に係るボンド磁心用フェライト粒子粉末の主な用
途は、コンピュータ、通信機器、民生用機器等の各種電
子機器の誘導コイル、変圧器等の磁心材料に用いられる
。The ferrite particles for bonded magnetic core according to the present invention are mainly used as magnetic core materials for induction coils, transformers, etc. of various electronic devices such as computers, communication devices, and consumer devices.
〔従来の技術］
周知の如く、ボンド磁心は焼結磁心に比べ、寸法精度、
加工性及び脆弱性等に優れている為に小型、薄型、そし
て複雑な形状品でも容易に量産化できる利点があり、近
年、エレクトロニクスの発展とともにこれらの利点を生
かしての軽量化、小型化及び精密化の要求が一層強まっ
て来ている。[Prior Art] As is well known, bonded magnetic cores have higher dimensional accuracy and better dimensional accuracy than sintered magnetic cores.
Because of its excellent workability and brittleness, it has the advantage of being able to easily mass-produce small, thin, and complex-shaped products.In recent years, with the development of electronics, these advantages have been utilized to reduce weight, size, and The demand for precision is becoming stronger.
一般にボンド磁心は、磁性材料粉末とナイロン、フェノ
ール等の樹脂とを混練した後、加熱成型や射出成型して
成型体を得ることにより製造されている。Generally, a bonded magnetic core is manufactured by kneading magnetic material powder and a resin such as nylon or phenol, followed by heat molding or injection molding to obtain a molded body.
上記磁性材料粉末としては、Ｍｎ−Ｚｎ系フェライト、
Ｎｉ−Ｚｎ系フェライト等の酸化物系のものが使用され
ており、通常、主原料であるＦｅｚＯ１、Ｍｎ０１Ｚｎ
Ｏ及びＮｉＯ等を所望の組成になるように予め湿式又は
乾式で配合混合し、造粒した後、焼成を行い、続いて、
平均粒子径が数μｍ〜数百μｍ程度の大きさまで粉砕を
施す方法により得られている。The magnetic material powder includes Mn-Zn ferrite,
Oxide-based materials such as Ni-Zn ferrite are used, and usually the main raw materials FezO1, Mn01Zn
O, NiO, etc. are mixed in advance in a wet or dry manner so as to have a desired composition, and after granulation, calcination is performed, and then,
It is obtained by a method of pulverizing the particles to an average particle diameter of several μm to several hundred μm.
ボンド磁心は、前述した通り磁性材料粉末がナイロン、
フェノール等の樹脂によって結合されているものであり
、焼結磁心と比較してボンド磁心の緒特性、特に透磁率
は、用いられる磁性材料粉末の特性と密接な関係にあり
大きく影響することが知られている。As mentioned above, the bonded magnetic core has magnetic material powder made of nylon,
Bonded magnetic cores are bonded by resin such as phenol, and it is known that the properties of bonded magnetic cores, especially magnetic permeability, are closely related to and greatly influenced by the properties of the magnetic material powder used, compared to sintered magnetic cores. It is being
従って、大きな透磁率を有するボンド磁心を得るために
は、大きな透磁率を有するフェライト粒子粉末を磁性材
料粉末として使用することが有利である。Therefore, in order to obtain a bonded magnetic core with high magnetic permeability, it is advantageous to use ferrite particle powder with high magnetic permeability as the magnetic material powder.
〔発明が解決しようとする課題）
しかし、前記従来法によって得られるボンド磁心用フェ
ライト粒子粉末は、ＦｅｚＯ３、ＮｉＯ、Ｚ口０等の各
原料を配合混合した後、径が数１〜数＋ｍｎ＋程度の造
粒物を作製し、この造粒物を高温度焼成して得られるも
のであるが、得られたフェライト粒子は結晶粒が数百μ
ｍと巨大に成長して不均一になっており、しかも該結晶
粒内には多くの空孔を内包しており、これら結晶粒の不
均一と空孔の存在により透磁率は低下し、結果的に磁性
粉として透磁率の小さいフェライト粒子粉末が得られて
しまい、また、磁性粉自体、粉砕されたことによって角
はばった粒子粉末となっているため、射出成型の際には
流動性の悪いものであって、ボンド磁心用の磁性材料粉
末として好適とは言えないものであった。[Problems to be Solved by the Invention] However, the ferrite particle powder for bonded magnetic core obtained by the conventional method has a diameter of about several 1 to several + mn+ after mixing raw materials such as FezO3, NiO, and Z-port 0. The ferrite particles are obtained by preparing granules and firing the granules at high temperatures.
The crystal grains have grown to a gigantic size of m and are non-uniform, and the crystal grains contain many vacancies.The non-uniformity of these crystal grains and the presence of vacancies reduce the magnetic permeability. As a result, ferrite particles with low magnetic permeability are obtained as magnetic powder, and the magnetic powder itself has been crushed to become rounded particles, so it has poor fluidity during injection molding. Therefore, it could not be said to be suitable as a magnetic material powder for a bonded magnetic core.
従って、前記従来法によって得られた透磁率の小さいフ
ェライト粒子粉末をボンド磁心用の磁性材料粉末として
使用した場合には、高々２０程度の透磁率を有したボン
ド磁心しか得ることが出来なかった。Therefore, when ferrite particles with low magnetic permeability obtained by the conventional method are used as magnetic material powder for a bonded magnetic core, a bonded magnetic core having a magnetic permeability of about 20 at most can only be obtained.
もっとも、透磁率の大きなボンド磁心を得るために使用
される好ましい磁性材料粉末も提案されている。However, preferred magnetic material powders used to obtain bonded magnetic cores with high magnetic permeability have also been proposed.
例えば、特開昭５５−１０３７０５号公報に記載の方法
は、高透磁率を有する成形体（ボンド磁心）を得るため
磁性材料粉末として粒径１００μ乃至５開の範囲で大き
さの異なる粒子群の混合物より形成されている混合フェ
ライト粒子粉末が用いられている。For example, the method described in Japanese Patent Application Laid-Open No. 55-103705 uses particles of different sizes in the range of 100μ to 5μ as magnetic material powder to obtain a molded body (bond magnetic core) with high magnetic permeability. A mixed ferrite particle powder formed from a mixture is used.
しかし、この混合フェライト粒子粉末は、粒径の大きな
（５ｍｍ）粒子が含まれているため、射出成型によって
ボンド磁心を製造する場合の磁性材料粉末としては好適
なものではない。しかも、混合する以前の各フェライト
粒子粉末は共に前記した従来法によって得られたフェラ
イト粒子であって、その透磁率は小さいものである。However, since this mixed ferrite particle powder contains particles with a large particle size (5 mm), it is not suitable as a magnetic material powder when manufacturing a bonded magnetic core by injection molding. Moreover, each ferrite particle powder before being mixed is a ferrite particle obtained by the conventional method described above, and its magnetic permeability is small.
従って、透磁率の大きなボンド磁心を射出成型により得
るのに好適な透磁率の大きいフェライト粒子粉末が強く
要求されている。Therefore, there is a strong demand for a ferrite particle powder with a high magnetic permeability suitable for obtaining a bond magnetic core with a high magnetic permeability by injection molding.
〔課題を解決する為の手段］
上述した現況に鑑み、本発明者は、ボンド磁心用磁性材
料粉末としての透磁率の大きいフェライト粒子粉末を得
るべ（探究してきた。[Means for Solving the Problems] In view of the above-mentioned current situation, the present inventor has been searching for a method to obtain a ferrite particle powder with high magnetic permeability as a magnetic material powder for a bonded magnetic core.
その探究過程において、フェライト粒子構造とその透磁
率との関連について着目した。即ち、本発明者は、透磁
率の大きなフェライト粒子粉末を製造する為には、結晶
粒が均一で、しかも適度の大きさを有し、空孔が存在し
ないフェライト粒子粉末を得ることが必要であり、その
為には焼成時において、■空孔が拡散し易い。■焼成雰
囲気との平衡が容易である。■熱を均一に受は易いとい
う諸条件を満たす球状を呈した造粒物を用いることが重
要であると考え、実質的に球状に造粒することができる
噴霧乾燥について着目し、検討を進めて来た。In the process of research, we focused on the relationship between ferrite grain structure and its magnetic permeability. That is, in order to produce ferrite particles with high magnetic permeability, the inventors believe that it is necessary to obtain ferrite particles with uniform crystal grains, appropriate size, and no pores. Therefore, during firing, the pores are easily diffused. ■ Equilibrium with the firing atmosphere is easy. ■We believe that it is important to use granules with a spherical shape that satisfies the conditions of being able to easily receive heat uniformly, and we are focusing on spray drying, which can produce granules in a substantially spherical shape, and are proceeding with studies. I came.
そして、ＰｅｔＯｓ ４’ｌ〜５５モル％、ＮｉＯＬＯ
〜２３モル％、Ｚｎ０２５〜４０モル％なる組成のフェ
ライト形成用混合粉末を、当該フェライト形成用混合粉
末重量に対して０．２〜１．０重量％の界面活性剤を含
有する水に分散混合し、スラリー濃度が４０〜６０重量
％の水分散スラリーに調製した後、これを噴霧乾燥して
得た平均粒子径２５〜１８０μｍの球状の造粒物を１１
００〜１３５Ｑ℃の温度範囲で焼成を行う場合には、平
均粒径が５〜１５μｍの結晶粒によって形成されている
平均粒子径２０〜１５０μｍのニッケル・亜鉛フェライ
ト球状粒子粉末であり、且つ透磁率が２５以上であるボ
ンド磁心用フェライト粒子粉末が得られることを見出し
、本発明を完成するに至ったのである。and PetOs 4'l~55 mol%, NiOLO
A mixed powder for forming ferrite having a composition of ~23 mol% and 25-40 mol% of Zn is dispersed and mixed in water containing a surfactant of 0.2 to 1.0% by weight based on the weight of the mixed powder for ferrite formation. After preparing an aqueous dispersion slurry with a slurry concentration of 40 to 60% by weight, the resulting spherical granules with an average particle diameter of 25 to 180 μm were prepared by spray drying.
When firing in the temperature range of 00 to 135Q℃, the nickel-zinc ferrite spherical particle powder with an average particle size of 20 to 150 μm is formed by crystal grains with an average particle size of 5 to 15 μm, and the magnetic permeability is They discovered that it is possible to obtain ferrite particles for bonded magnetic cores in which the particle diameter is 25 or more, and have completed the present invention.
即ち、本発明は、平均粒径が５〜１５μｍの結晶粒によ
って形成されている平均粒子径２０〜１５０μｍのニッ
ケル・亜鉛フェライト球状粒子粉末であり、且つ透磁率
が２５以上であることを特徴とするボンド磁心用フェラ
イト粒子粉末及びその製造法である。That is, the present invention is characterized in that it is a nickel-zinc ferrite spherical particle powder with an average particle size of 20 to 150 μm formed by crystal grains with an average particle size of 5 to 15 μm, and a magnetic permeability of 25 or more. A ferrite particle powder for a bonded magnetic core and a method for producing the same.
先ず、本発明において最も重要な点は、平均粒径が５〜
１５μｍの結晶粒によって形成されている平均粒子径２
０〜１５０μｍのニッケル・亜鉛フェライト球状粒子粉
末は、２５以上の透磁率が得られるという点である。First, the most important point in the present invention is that the average particle size is 5 to 5.
Average particle size 2 formed by crystal grains of 15 μm
The nickel-zinc ferrite spherical particle powder of 0 to 150 μm has a magnetic permeability of 25 or more.
本発明において！１ｉｆｆ率が２５以上であるニッケル
・亜鉛フェライト球状粒子粉末が得られる理由について
、本発明者は、本発明方法により得られるニッケル・亜
鉛フェライト球状粒子粉末は、結晶粒が均一でしかも適
度の大きさを有し、空孔の存在が少ない粒子となってい
ることによるものと考えでいる。In the present invention! Regarding the reason why nickel-zinc ferrite spherical particles powder having a 1iff ratio of 25 or more can be obtained, the present inventor believes that the nickel-zinc ferrite spherical particle powder obtained by the method of the present invention has uniform crystal grains and an appropriate size. This is thought to be due to the fact that the particles have a small number of pores.
また本発明におけるボンド磁心用フェライト粒子粉末は
、従来の角ぼっている不定形のフェライト粒子粉末と異
なり、適度の大きさを有し、球状の形態を呈した粒子で
あるため流動性に優れており、従って、この粉末と樹脂
とを混練した後、成型するに際して、特に射出成型法を
用いた場合には複雑な形状の成型体を容易に製造するこ
とが可能となる。In addition, the ferrite particles for bonded magnetic cores of the present invention have excellent fluidity because they have an appropriate size and a spherical shape, unlike conventional ferrite particles that have an irregular shape. Therefore, when this powder and resin are kneaded and then molded, especially when injection molding is used, it becomes possible to easily produce a molded article with a complicated shape.
次に、本発明実施にあたっての諸条件について説明する
。Next, various conditions for implementing the present invention will be explained.
先ず、本発明におけるボンド磁心用フェライト粒子粉末
は、ＰｅｚＯｉ ４７〜５５モル％、Ｎｉ０１０〜２３
モル％、Ｚｎ０２５〜４０モル％で表される組成をもつ
フェライト粒子からなり、この範囲の組成のフェライト
粒子粉末はボンド磁心用のフェライト球料として使用で
きるが、この範囲外では透磁率が低くなり実用上好まし
くない。First, the ferrite particle powder for bonded magnetic core in the present invention contains 47 to 55 mol% of PezOi and 10 to 23% of Ni.
It consists of ferrite particles with a composition expressed by 25 to 40 mol% of Zn0, and ferrite particle powder with a composition within this range can be used as a ferrite ball material for bonded magnetic cores, but outside this range, the magnetic permeability becomes low. Practically unfavorable.
本発明における出発原料の一つである酸化鉄としては、
ａ−Ｆｅｚｅｓ、ｒ−ＦｅｚＯｓ又はＦｅ、０４、含水
酸化鉄としては、α−Ｆｅ００Ｈ１β−ＦｅＯＯＨ，７
−ＦｅＯＯｔｌが使用できる。最も好ましいのはα−Ｆ
ｅｚＯ：＋である。As iron oxide, which is one of the starting materials in the present invention,
a-Fezes, r-FezOs or Fe,04, as hydrous iron oxide, α-Fe00H1β-FeOOH,7
-FeOOtl can be used. Most preferred is α-F
ezO: +.
本発明におけるボンド磁心用フェライト粒子粉末は、平
均粒径が５〜１５μｍの結晶粒によって形成されている
平均粒子径２０〜１５０μｍのニッケル・亜鉛フェライ
ト球状粒子粉末ででなければならない。２０ａｍ以下の
場合には、粒子成長が不充分となり好ましくない。 １
５０ＩＩｍ以上の場合には、結晶粒が異常成長し、しか
も空孔が残り易くなり透磁率が低下する為好ましくない
。The ferrite particles for a bonded magnetic core in the present invention must be nickel-zinc ferrite spherical particles having an average particle size of 20 to 150 μm and formed of crystal grains having an average particle size of 5 to 15 μm. If it is less than 20 am, grain growth will be insufficient, which is not preferable. 1
If it is 50 IIm or more, the crystal grains will grow abnormally, and moreover, pores will tend to remain and the magnetic permeability will decrease, which is not preferable.
上記した本発明の目的とするボンド磁心用フェライト粒
子粉末を得るためには、焼成前の造粒物の平均粒子径は
２５〜１８０μｍの範囲に制御しておく必要がある。In order to obtain the above-mentioned ferrite particles for a bonded magnetic core, which is the object of the present invention, it is necessary to control the average particle size of the granules before firing to a range of 25 to 180 μm.
その為には、フェライト形成用混合粉末を、０２〜１．
０重量％（フェライト形成用混合粉末の重量に対して）
の界面活性剤を含有する水に分散混合し、スラリー濃度
が４０〜６０重盪％の水分散スラリーに調製した後、該
スラリーを噴霧乾燥しなければならない。スラリー濃度
が４０重量％以下の場合には、噴霧乾燥効率が悪くなり
生産性が低下し、６０重量％以上の場合には供給が困難
となり噴霧乾燥が不可能となり、本発明の目的とするボ
ンド磁心用フェライト粒子粉末が得難くなる。For that purpose, the mixed powder for ferrite formation is mixed with a powder of 02 to 1.
0% by weight (based on the weight of mixed powder for ferrite formation)
After dispersing and mixing in water containing a surfactant to prepare a water-dispersed slurry with a slurry concentration of 40 to 60% by weight, the slurry must be spray-dried. If the slurry concentration is less than 40% by weight, the spray drying efficiency will be poor and productivity will be reduced, and if it is more than 60% by weight, supply will be difficult and spray drying will be impossible. It becomes difficult to obtain ferrite particles for magnetic cores.
本発明における界面活性剤としては、カルボン酸塩、ス
ルホン酸塩、アミン塩、アンモニウム塩の界面活性剤が
使用でき、その使用量はフェライト形成用混合粉末重量
に対して０．２〜１．０重量％が好ましい。As the surfactant in the present invention, surfactants such as carboxylate, sulfonate, amine salt, and ammonium salt can be used, and the amount used is 0.2 to 1.0 based on the weight of the mixed powder for ferrite formation. Weight percent is preferred.
本発明における焼成温度は１１００〜１３５０°Ｃの範
囲である。１１００’ｃ以下の場合には、フェライト生
成が不充分で結晶粒の大きいものが得られない。１３５
０℃以上の場合には、結晶粒の異常成長が促進され、不
均一で空孔が多く発生する為好ましくない。The firing temperature in the present invention is in the range of 1100 to 1350°C. If it is less than 1100'c, ferrite formation is insufficient and large crystal grains cannot be obtained. 135
If the temperature is 0° C. or higher, abnormal growth of crystal grains is promoted, resulting in non-uniformity and generation of many vacancies, which is not preferable.
〔実施例］ 次に、実施例並びに比較例により本発明を説明する。〔Example] Next, the present invention will be explained with reference to Examples and Comparative Examples.
尚、以下の実施例並びに比較例におけるフェライト粒子
粉末の透磁率は、フェライト粒子粉末とポリビニルアル
コールとの混合物を造粒し、ｌｔ。The magnetic permeability of the ferrite particles in the following Examples and Comparative Examples is determined by granulating a mixture of ferrite particles and polyvinyl alcohol.
ｎ／ｃ４の圧力で外径３６＋＋ｎφ×内径２４ｆｆｉｍ
φ×高さ１０ｓ＋ｓの円筒形にプレス成型した圧粉成型
体を測定試料とし、インピーダンスアナライザー４１９
４Ａ （横河・ヒユーレット・パラカード■製）を用い
、周波数ＩＭＩｌｚの条件下で測定した値である。Outer diameter 36++ + nφ x inner diameter 24ffim at n/c4 pressure
A powder compact press-molded into a cylindrical shape of φ x height 10s + s was used as the measurement sample, and the impedance analyzer 419
4A (manufactured by Yokogawa Huyuret Paracard) under the condition of frequency IMIlz.
実施例１
酸化鉄（α−ＦｅｚＯｔ） ３３．８５ｋｇと酸化ニ
ッケル６゜１０ｋｇ及び酸化亜鉛１０．９５ｋｇとを混
合してＦｔ４０３ ：５０．１モル％、ＮｉＯ： １
８．７モル％、ＺｎＯ： ３１．２モル％の組成を有し
たフェライト形成用混合粉末を作製した。次いで、該混
合物をポリカルボン酸アンモニウム塩（ＳＮデイスパー
サント５４６８ サンノブコ社製）０．３重量％（フ
ェライト形成用混合粉末重量に対して）を溶解した６０
．５ｊ２の水溶液中に投入した。水溶液中におけるスラ
リー濃度は４５．７重量％であった。続いて該スラリー
を噴霧乾燥して平均粒子径１０５μｍの造粒物を得た。Example 1 33.85 kg of iron oxide (α-FezOt), 6°10 kg of nickel oxide, and 10.95 kg of zinc oxide were mixed to produce Ft403: 50.1 mol%, NiO: 1
A mixed powder for forming ferrite having a composition of 8.7 mol % and ZnO: 31.2 mol % was produced. Next, the mixture was mixed with 60% by weight of polycarboxylic acid ammonium salt (SN Dispersant 5468 manufactured by San Nobuco Co., Ltd.) (based on the weight of the mixed powder for ferrite formation).
．． 5j2 aqueous solution. The slurry concentration in the aqueous solution was 45.7% by weight. Subsequently, the slurry was spray-dried to obtain granules having an average particle size of 105 μm.
得られた造粒物を１３２０°Ｃの温度で３時間焼成して
フェライト化を行い、ニッケル・亜鉛フェライト球状粒
子粉末からなるボンド磁心用フェライト粒子粉末を得た
。The obtained granules were fired at a temperature of 1320° C. for 3 hours to form ferrite, thereby obtaining ferrite particles for bonded magnetic cores consisting of spherical nickel-zinc ferrite particles.
得られたボンド磁心用フェライト粒子粉末の透磁率は３
２．７であり、図１に示す走査型電子顕微鏡写真での観
察の結果、平均粒径が１２．２μｍの結晶粒によって形
成されている平均粒子径８０μｍのニッケル・亜鉛フェ
ライト球状粒子であり、空孔の少ないものであることが
確認できた。The magnetic permeability of the obtained ferrite particle powder for bonded magnetic core is 3
2.7, and as a result of observation with the scanning electron microscope photograph shown in FIG. 1, it is a nickel-zinc ferrite spherical particle with an average particle size of 80 μm formed by crystal grains with an average particle size of 12.2 μm, It was confirmed that there were few pores.
実施例２〜６、比較例１〜７
フェライト形成用混合粉末の組成比、界面活性剤の種類
及び量、フェライト形成用混合スラリー濃度、造粒物の
大きさ並びに焼成温度を種々変化させた以外は実施例１
と同様にしてボンド磁心用フェライト粒子粉末を得た。Examples 2 to 6, Comparative Examples 1 to 7 The composition ratio of the mixed powder for ferrite formation, the type and amount of surfactant, the concentration of the mixed slurry for ferrite formation, the size of the granules, and the firing temperature were varied. is Example 1
Ferrite particles for a bonded magnetic core were obtained in the same manner as in the above.
この時の主要製造条件及びボンド磁心用フェライト粒子
粉末の特性を表１に示す。Table 1 shows the main manufacturing conditions at this time and the characteristics of the ferrite particle powder for bonded magnetic core.
尚、実施例３に於ける酸化鉄原料はＦｅ５０．を用い、
実施例５に於ける界面活性剤はポリカルボン酸ナトリウ
ム塩（ノプコサントＫ サンノプコ社！！りを用いた。In addition, the iron oxide raw material in Example 3 was Fe50. using
As the surfactant in Example 5, polycarboxylic acid sodium salt (Nopco Santo K, San Nopco Co., Ltd.) was used.
また、比較例７はフェライト形成用混合粉末を噴霧乾燥
せずに従来法で５１程度の造粒物を作製し、この造粒物
を１２５０℃の温度範囲で焼成し、次いで、焼成物を粉
砕して平均粒子径３８．８μｍで空孔の多いボンド磁心
用フェライト粒子粉末を得た。In addition, in Comparative Example 7, approximately 51 granules were prepared using the conventional method without spray drying the mixed powder for ferrite formation, the granules were fired in a temperature range of 1250°C, and then the fired product was pulverized. A ferrite particle powder for bonded magnetic core with an average particle diameter of 38.8 μm and many pores was obtained.
１発明の効果〕
本発明に係るボンド磁心用フェライト粒子粉末は、前出
実施例に示した通り、フェライト組成の範囲ＦｅｚＯｘ
４７〜５５モル％、Ｎｉ０１０〜２３モル％、Ｚｎ０
２５〜４０モル％に於いて、平均粒径が５〜１５μｍの
結晶粒によって形成されている平均粒子径２０〜１５０
μｍのニッケル・亜鉛フェライト球状粒子粉末であり、
透磁率が２５以上のボンド磁心用フェライト・粒子粉末
を得ることができるので、現在要求されているボンド磁
心用のフェライト粒子粉末として好適である。1 Effect of the invention] As shown in the above-mentioned example, the ferrite particle powder for bonded magnetic core according to the present invention has a ferrite composition range of FezOx
47-55 mol%, Ni010-23 mol%, Zn0
At 25 to 40 mol%, the average particle size is 20 to 150, which is formed by crystal grains with an average particle size of 5 to 15 μm.
It is nickel-zinc ferrite spherical particle powder of μm size,
Since it is possible to obtain ferrite particles for bonded magnetic cores having a magnetic permeability of 25 or more, it is suitable as the currently required ferrite particles for bonded magnetic cores.
図１乃至図６は、いずれも走査型電子顕微鏡写真（ｘ
６５００ ）であり、図１は実施例１、図２は実施例２
、図３は実施例４で得られたボンド磁心用フェライト粒
子粉末の粒子構造を示す走査型電子顕微鏡写真であり、
回４は比較例３、図５は比較例４、図６は比較例７で得
られたフェライト粒子粉末の粒子構造を示す走査型電子
顕微鏡写真である。Figures 1 to 6 are all scanning electron micrographs (x
6500 ), FIG. 1 shows Example 1, and FIG. 2 shows Example 2.
, FIG. 3 is a scanning electron micrograph showing the particle structure of the ferrite particle powder for bonded magnetic core obtained in Example 4,
Time 4 is a scanning electron micrograph showing the particle structure of the ferrite particles obtained in Comparative Example 3, FIG. 5 is Comparative Example 4, and FIG. 6 is Comparative Example 7.
Claims (2)
れている平均粒子径２０〜１５０μｍのニッケル・亜鉛
フェライト球状粒子粉末であり、且つ透磁率が２５以上
であることを特徴とするボンド磁心用フェライト粒子粉
末。(1) A bonded magnetic core characterized by being a nickel-zinc ferrite spherical particle powder with an average particle size of 20-150 μm formed by crystal grains with an average particle size of 5-15 μm, and having a magnetic permeability of 25 or more. Ferrite particle powder for use.
ケル及び酸化亜鉛の粉末を用い、Ｆｅ＿２Ｏ＿３に換算
したとき４７〜５５モル％となる量の酸化鉄又は含水酸
化鉄粉末、ＮｉＯに換算したとき１０〜２３モル％とな
る量の酸化ニッケル粉末及びＺｎＯに換算したとき２５
〜４０モル％となる量の酸化亜鉛粉末からなるフェライ
ト形成用混合粉末を、該フェライト形成用混合粉末重量
に対して０．２〜１．０重量％の界面活性剤を含有する
水に分散混合し、スラリー濃度が４０〜６０重量％の水
分散スラリーに調製した後、噴霧乾燥して平均粒子径２
５〜１８０μｍの球状の造粒物とした後、当該造粒物を
１１００〜１３５０℃の温度範囲で焼成することによっ
て平均粒径が５〜１５μｍの結晶粒によって形成されて
いる平均粒子径２０〜１５０μｍのニッケル・亜鉛フェ
ライト球状粒子粉末であり、且つ透磁率が２５以上であ
ることを特徴とするボンド磁心用フェライト粒子粉末の
製造法。(2) Using powders of iron oxide or hydrated iron oxide, nickel oxide, and zinc oxide as starting materials, the amount of iron oxide or hydrated iron oxide powder is 47 to 55 mol% when converted to Fe_2O_3, when converted to NiO. Nickel oxide powder in an amount of 10 to 23 mol% and 25 when converted to ZnO
A mixed powder for ferrite formation consisting of zinc oxide powder in an amount of ~40 mol% is dispersed and mixed in water containing a surfactant of 0.2 to 1.0% by weight based on the weight of the mixed powder for ferrite formation. After preparing an aqueous dispersion slurry with a slurry concentration of 40 to 60% by weight, it was spray-dried to an average particle size of 2.
After forming spherical granules of 5 to 180 μm, the granules are fired at a temperature range of 1100 to 1350°C to obtain crystal grains with an average particle diameter of 20 to 15 μm. A method for producing a ferrite particle powder for a bonded magnetic core, which is a 150 μm nickel-zinc ferrite spherical particle powder and has a magnetic permeability of 25 or more.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1101204A JP2743009B2 (en) | 1989-04-19 | 1989-04-19 | Ferrite particle powder for bond core and method for producing the same |
| DE1990612398 DE69012398T2 (en) | 1989-04-19 | 1990-04-18 | Ferrite particles and ferrite-resin composite for bonded magnetic core and process for their manufacture. |
| EP19900304167 EP0394020B1 (en) | 1989-04-19 | 1990-04-18 | Ferrite particles and ferrite resin composite for bonded magnetic core and process for their production |
| US07/773,329 US5198138A (en) | 1989-04-19 | 1991-10-11 | Spherical ferrite particles and ferrite resin composite for bonded magnetic core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1101204A JP2743009B2 (en) | 1989-04-19 | 1989-04-19 | Ferrite particle powder for bond core and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02278702A true JPH02278702A (en) | 1990-11-15 |
| JP2743009B2 JP2743009B2 (en) | 1998-04-22 |
Family
ID=14294401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1101204A Expired - Fee Related JP2743009B2 (en) | 1989-04-19 | 1989-04-19 | Ferrite particle powder for bond core and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2743009B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998036430A1 (en) * | 1997-02-13 | 1998-08-20 | Kureha Kagaku Kogyo K.K. | Soft magnetic composite material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5090996A (en) * | 1973-12-12 | 1975-07-21 | ||
| JPS62252366A (en) * | 1986-04-25 | 1987-11-04 | 富士電気化学株式会社 | Ferrite material for high frequency |
-
1989
- 1989-04-19 JP JP1101204A patent/JP2743009B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5090996A (en) * | 1973-12-12 | 1975-07-21 | ||
| JPS62252366A (en) * | 1986-04-25 | 1987-11-04 | 富士電気化学株式会社 | Ferrite material for high frequency |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998036430A1 (en) * | 1997-02-13 | 1998-08-20 | Kureha Kagaku Kogyo K.K. | Soft magnetic composite material |
| US6338900B1 (en) | 1997-02-13 | 2002-01-15 | Kureha Kagaku Kogyo K.K. | Soft magnetic composite material |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2743009B2 (en) | 1998-04-22 |
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