JP3464100B2 - High saturation magnetic flux density ferrite material and ferrite core using the same - Google Patents
High saturation magnetic flux density ferrite material and ferrite core using the sameInfo
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- JP3464100B2 JP3464100B2 JP20237896A JP20237896A JP3464100B2 JP 3464100 B2 JP3464100 B2 JP 3464100B2 JP 20237896 A JP20237896 A JP 20237896A JP 20237896 A JP20237896 A JP 20237896A JP 3464100 B2 JP3464100 B2 JP 3464100B2
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は飽和磁束密度の高い
酸化物磁性材料、及びこれを用いたフェライトコアに関
するものである。TECHNICAL FIELD The present invention relates to an oxide magnetic material having a high saturation magnetic flux density, and a ferrite core using the same.
【０００２】[0002]
【従来の技術】Ｎｉ−Ｚｎ系のフェライト材料は、イン
ダクター・変圧器・安定器・電磁石等のコアとして広く
使用されている。2. Description of the Related Art Ni-Zn ferrite materials are widely used as cores for inductors, transformers, ballasts, electromagnets and the like.
【０００３】特に、近年、携帯電話やノート型パソコン
等、バッテリー駆動の携帯機器の小型・薄型化の進展と
ともに、これらの携帯機器に求められる電源も小型・薄
型化の要求が強くなっている。そこで、上記インダクタ
ンス用のコアも小型化されることから大きな電流を流し
にくくなっており、体積が小さくても大きな電流を流す
ことのできるフェライト材料が求められ、飽和磁束密度
の大きいフェライト材が望まれている。In recent years, in particular, with the progress of downsizing and thinning of battery-driven portable devices such as mobile phones and notebook personal computers, there is an increasing demand for downsizing and thinning of power sources required for these portable devices. Therefore, since the core for inductance is also downsized, it is difficult for a large current to flow, and a ferrite material that can flow a large current even with a small volume is required, and a ferrite material with a high saturation magnetic flux density is desired. It is rare.
【０００４】即ち、フェライト材料をコア形状とし、巻
き線を施してインダクターとした場合に、巻き線に加え
る電流を大きくするほど生じる磁束密度が大きくなる
が、ある一定値で飽和して、それ以上にはならないとい
う特性がある。この時の磁束密度が飽和磁束密度（以下
Ｂｓ値）であり、このＢｓ値を超える範囲の電流を流す
と発熱等の不都合が生じてしまう。したがって、Ｂｓ値
が大きいほど大きな電流を流すことができるのである。In other words, when a ferrite material is used as a core and is wound into an inductor, the larger the current applied to the winding, the greater the magnetic flux density generated. There is a characteristic that does not become. The magnetic flux density at this time is the saturation magnetic flux density (hereinafter referred to as Bs value), and if a current in a range exceeding this Bs value is passed, inconvenience such as heat generation will occur. Therefore, the larger the Bs value, the larger the current can flow.
【０００５】[0005]
【課題を解決するための手段】ところが、一般的に用い
られるＮｉ−Ｚｎ系フェライトでは、Ｂｓ値は４１００
Ｇ（ガウス）以下と低いものであった。However, in a commonly used Ni-Zn type ferrite, the Bs value is 4100.
It was as low as G (Gauss) or less.
【０００６】一方、Ｎｉ−Ｚｎ系フェライトに各種添加
物を加えることによって、特性を高めることも提案され
ているが（特開昭４９−２０９２号、４９−２０９３
号、特公昭５２−２７３５８号公報等参照）、いずれも
上記問題を解決するものではなかった。On the other hand, it has been proposed to add various additives to Ni-Zn type ferrite to improve the characteristics (Japanese Patent Laid-Open Nos. 49-2092 and 49-2093).
Japanese Patent Publication No. 52-27358, etc.) did not solve the above problems.
【０００７】そこで、本発明は、Ｂｓ値が４１００Ｇを
超えるような高飽和磁束密度のフェライト材料を得るこ
とを目的とする。Therefore, an object of the present invention is to obtain a ferrite material having a high saturation magnetic flux density such that the Bs value exceeds 4100G.
【０００８】[0008]
【課題を解決するための手段】本発明の高飽和磁束密度
フェライト材料は、５４〜７５モル％のＦｅ2 Ｏ3 と、
１０〜３０モル％のＺｎＯと、１０〜２５モル％のＮｉ
Ｏと、３〜１０モル％のＣｕＯを主成分とし、Ｚｎ／Ｎ
ｉのモル比が１〜１．５であって、かつ上記主成分１０
０重量部に対し、０．１〜５重量部のＢｉ2 Ｏ3 と、
０．１〜５重量部のＭｏＯ3 を含有することを特徴とす
る。The high saturation magnetic flux density ferrite material of the present invention comprises 54 to 75 mol% of Fe 2 O 3 and
10 to 30 mol% ZnO and 10 to 25 mol% Ni
O and 3 to 10 mol% CuO as main components, Zn / N
The molar ratio of i is 1 to 1.5, and the main component 10
0.1 to 5 parts by weight of Bi 2 O 3 with respect to 0 parts by weight,
It is characterized by containing 0.1 to 5 parts by weight of MoO 3 .
【０００９】即ち、本発明は、Ｎｉ−Ｚｎ−Ｃｕ系フェ
ライトに対して、所定量のＢｉ2 Ｏ3 、ＭｏＯ3 を添加
することによって、Ｂｓ値が４１００Ｇ以上、好適には
４７００Ｇ以上となるような高飽和磁束密度のフェライ
ト材料を得るようにした。That is, according to the present invention, by adding a predetermined amount of Bi 2 O 3 or MoO 3 to Ni-Zn-Cu type ferrite, the Bs value becomes 4100 G or more, preferably 4700 G or more. A high saturation magnetic flux density ferrite material was obtained.
【００１０】本発明において、主成分の組成比を上記範
囲とした理由は以下の通りである。Ｆｅ2 Ｏ3 を５４〜
７５モル％としたのは、Ｆｅ2 Ｏ3 が５４モル％未満で
はＢｓ値と透磁率が低下し、７５モル％を超えるとＢｓ
値が低下するためである。ＺｎＯを１０〜３０モル％と
したのは、１０モル％未満では透磁率が低下し、３０モ
ル％を超えるとＢｓ値が低下するためである。ＮｉＯを
１０〜２５モル％としたのは、１０モル％未満ではＢｓ
値が低下し、２５モル％を超えると透磁率が低下するた
めである。ＣｕＯを３〜１０モル％としたのは、３モル
％未満では焼結性が低下し、１０モル％を超えるとＢｓ
値が低下するためである。In the present invention, the reason why the composition ratio of the main components is within the above range is as follows. Fe 2 O 3 54 ~
The content of 75 mol% means that Bs value and magnetic permeability are decreased when Fe 2 O 3 is less than 54 mol%, and Bs value is exceeded when it exceeds 75 mol%.
This is because the value decreases. The ZnO content is set to 10 to 30 mol% because the magnetic permeability decreases when it is less than 10 mol% and the Bs value decreases when it exceeds 30 mol%. NiO is set to 10 to 25 mol% because Bs is less than 10 mol%
This is because the value decreases, and when it exceeds 25 mol%, the magnetic permeability decreases. The content of CuO is set to 3 to 10 mol% because the sinterability is decreased when the content is less than 3 mol% and the Bs is increased when the content exceeds 10 mol%.
This is because the value decreases.
【００１１】また、Ｎｉ／Ｚｎのモル比を１．０〜１．
５としたのは、この比が１．０未満又は１．５を超える
とＢｓ値が低下するためである。Further, the molar ratio of Ni / Zn is 1.0-1.
The reason for setting 5 is that if this ratio is less than 1.0 or exceeds 1.5, the Bs value decreases.
【００１２】さらに、本発明で添加成分として加えるＢ
ｉ2 Ｏ3 は、焼結促進剤の作用をなす。即ち、上記主成
分では、Ｆｅ2 Ｏ3 の量が比較的多いため難焼結性であ
るが、焼結促進剤としてＢｉ2 Ｏ3 を添加することによ
って、焼結性を高めている。ここで、Ｂｉ2 Ｏ3 添加量
を０．１〜５重量部としたのは、０．１重量部未満では
焼結性が低下し、５重量部を超えるとＢｓ値が低下する
ためである。Further, B added as an additional component in the present invention
i 2 O 3 acts as a sintering accelerator. That is, in the above main component, since the amount of Fe 2 O 3 is relatively large, it is difficult to sinter, but the sinterability is enhanced by adding Bi 2 O 3 as a sintering accelerator. Here, the amount of Bi 2 O 3 added is set to 0.1 to 5 parts by weight because the sinterability decreases if the amount is less than 0.1 parts by weight, and the Bs value decreases if the amount exceeds 5 parts by weight. .
【００１３】また、本発明で添加成分として加えるＭｏ
Ｏ3 はＢｓ値を高くする作用を成し、ＭｏＯ3 の添加量
を０．１〜５重量部としたのは、０．１重量部未満又は
５重量部を超えるとＢｓ値が低下するためである。Mo added as an additional component in the present invention
O 3 has the function of increasing the Bs value, and the amount of MoO 3 added is 0.1 to 5 parts by weight because the Bs value decreases if it is less than 0.1 parts by weight or exceeds 5 parts by weight. Is.
【００１４】さらに、本発明のフェライト材料は、これ
らの成分以外に、ＭｎＯを０．１５重量部以下、ＳｉＯ
2 、Ａｌ2 Ｏ3 、ＭｇＯ、ＣａＯ、Ｋ2 Ｏ、Ｓ等を各々
０．０５重量部未満の範囲で含んでいても良い。Further, the ferrite material of the present invention contains, in addition to these components, 0.15 parts by weight or less of MnO and SiO 2.
2 , Al 2 O 3 , MgO, CaO, K 2 O, S and the like may be contained in an amount of less than 0.05 parts by weight each.
【００１５】本発明のフェライト材料の製造方法は、上
記範囲となるように主成分の各原料を調合し、振動ミル
等で粉砕混合した後、仮焼し、この仮焼粉体に添加成分
を加え、ボールミルで粉砕した後、バインダーを加えて
造粒し、得られた粉体をプレス成形にて所定形状に成形
し、９５０〜１２５０℃の範囲で焼成することによって
得られる。In the method for producing a ferrite material of the present invention, the respective raw materials of the main components are blended so as to fall within the above range, pulverized and mixed by a vibration mill or the like, and then calcined, and the additive components are added to the calcined powder. In addition, after pulverizing with a ball mill, a binder is added to granulate, the obtained powder is molded into a predetermined shape by press molding, and baked at 950 to 1250 ° C.
【００１６】また、本発明は、上記のフェライト材料を
用いてフェライトコアを形成したことを特徴とする。Further, the present invention is characterized in that a ferrite core is formed by using the above ferrite material.
【００１７】ここでフェライトコアとしては、図１
（ａ）に示すようなリング状のトロイダルコア１、ある
いは図１（ｂ）に示すようなボビン状コア２とすれば良
く、それぞれ巻き線部１ａ、２ａに巻き線を施すことに
よって、コイルとすることができる。Here, as the ferrite core, as shown in FIG.
A ring-shaped toroidal core 1 as shown in (a) or a bobbin-shaped core 2 as shown in FIG. 1 (b) may be used. By winding the winding portions 1a and 2a, respectively, a coil is formed. can do.
【００１８】このような本発明のフェライトコアは、特
にＤＣ−ＤＣコンバータ等、各種電子機器の電源に好適
に使用することができる。The ferrite core of the present invention as described above can be suitably used as a power source for various electronic devices such as a DC-DC converter.
【００１９】[0019]
【実施例】実施例１
５５モル％のＦｅ2 Ｏ3 と、２１モル％のＺｎＯと、２
１モル％のＮｉＯと（Ｚｎ／Ｎｉのモル比＝１）、３モ
ル％のＣｕＯから成る主成分を振動ミルで混合した後、
８００〜９００℃で仮焼した。この仮焼粉体に表１に示
す量のＢｉ2 Ｏ3 とＭｏＯ3 を添加し、ボールミルにて
粉砕した後、所定のバインダーを加えて造粒し、圧縮成
形して図１に示すトロイダルコア１の形状に成形し、こ
の成形体を９５０〜１２５０℃で焼成した。 Example 1 55 mol% Fe 2 O 3 , 21 mol% ZnO, 2
After mixing the main components consisting of 1 mol% NiO and (Zn / Ni mol ratio = 1) and 3 mol% CuO in a vibration mill,
It was calcined at 800 to 900 ° C. To this calcined powder, the amounts of Bi 2 O 3 and MoO 3 shown in Table 1 were added, and the mixture was crushed by a ball mill, and then a predetermined binder was added to granulate it, followed by compression molding to obtain the toroidal core shown in FIG. It was molded into a shape of No. 1 and the molded body was fired at 950 to 1250 ° C.
【００２０】得られた焼結体をトロイダルコア１とし、
これに線径０．２ｍｍの被膜銅線を７ターン巻き付けて
１００ｋＨｚで透磁率を測定した。次に、トロイダルコ
ア１に、図２に示すように線径０．２ｍｍの被膜銅線を
用いて１次側巻き線３を１００ターン、２次側巻き線４
を３０ターン巻き付けて、１次側巻き線３に電源５を、
２次側巻き線４に磁束計６をそれぞれ接続し、１００Ｈ
ｚ、５００ｍＡの条件でＢｓ値を測定した。The obtained sintered body was used as a toroidal core 1,
A coated copper wire having a wire diameter of 0.2 mm was wound around this for 7 turns, and the magnetic permeability was measured at 100 kHz. Next, as shown in FIG. 2, a coated copper wire having a wire diameter of 0.2 mm is used for the toroidal core 1 to turn the primary winding 3 100 turns and the secondary winding 4 4
For 30 turns, power supply 5 to primary winding 3,
Connect the magnetometers 6 to the secondary windings 4 respectively, and
The Bs value was measured under the conditions of z and 500 mA.
【００２１】結果は表１に示す通りである。この結果よ
り、Ｂｉ2 Ｏ3 が０．１重量部未満のもの（Ｎｏ．６〜
８）では焼結性が低いため焼成温度を１３００℃以上に
しなければならず、得られた焼結体の透磁率、Ｂｓ値と
もに低かった。一方、Ｂｉ2Ｏ3 が５重量部を超えるも
の（Ｎｏ．１〜３）ではＢｓ値が低かった。また、Ｍｏ
Ｏ3 が０．１重量部未満又は５重量部を超えるもの（Ｎ
ｏ．１，３〜６，８）ではＢｓ値が低かった。The results are shown in Table 1. From these results, those containing less than 0.1 parts by weight of Bi 2 O 3 (No. 6 to
In 8), since the sinterability was low, the firing temperature had to be 1300 ° C. or higher, and the magnetic permeability and Bs value of the obtained sintered body were low. On the other hand, Bs value was low in the case where Bi 2 O 3 exceeds 5 parts by weight (Nos. 1 to 3). Also, Mo
O 3 less than 0.1 parts by weight or more than 5 parts by weight (N
o. 1, 3 to 6, 8) had a low Bs value.
【００２２】これらに対し、Ｂｉ2 Ｏ3 の添加量を０．
１〜５重量部、ＭｏＯ3 の添加量を０．１〜５重量部と
した本発明の実施例（Ｎｏ．９〜１２）では、１１００
〜１１５０℃の低温で焼結し、透磁率が５００以上と高
く、Ｂｓ値も４７００Ｇ以上と高いことがわかる。On the other hand, the addition amount of Bi 2 O 3 was set to 0.
In the examples (Nos. 9 to 12) of the present invention in which the addition amount of MoO 3 is 1 to 5 parts by weight and the amount of MoO 3 is 0.1 to 5 parts by weight, 1100
It can be seen that the alloy was sintered at a low temperature of ˜1150 ° C., the magnetic permeability was as high as 500 or more, and the Bs value was as high as 4700 G or more.
【００２３】[0023]
【表１】 [Table 1]
【００２４】実施例２
次に、ＣｕＯを４モル％とし、添加成分であるＢｉ2 Ｏ
3 を２．５重量部、ＭｏＯ3 を２．５重量部に固定し、
他の主成分の組成比を表２に示すように変化させて、そ
の他の条件は上記実施例１と同様にして、トロイダルコ
ア１の形状の焼結体を得た。 Example 2 Next, CuO was adjusted to 4 mol%, and Bi 2 O as an additive component was added.
3 to 2.5 parts by weight and MoO 3 to 2.5 parts by weight,
The composition ratio of the other main components was changed as shown in Table 2 and the other conditions were the same as in Example 1 to obtain a sintered body having the shape of the toroidal core 1.
【００２５】得られた焼結体に対し、実施例１と同様に
して透磁率とＢｓ値を測定した結果は表２に示す通りで
ある。The results of measuring the magnetic permeability and the Bs value of the obtained sintered body in the same manner as in Example 1 are shown in Table 2.
【００２６】この結果より、Ｆｅ2 Ｏ3 、ＺｎＯ、Ｎｉ
Ｏの含有量が本発明の範囲外であるか、またはＺｎ／Ｎ
ｉのモル比が本発明の範囲外であるもの（Ｎｏ．１３〜
１９）では、Ｂｓ値が４１００Ｇ以下と低いものであっ
た。From these results, Fe 2 O 3 , ZnO, Ni
O content is outside the range of the present invention, or Zn / N
Those in which the molar ratio of i is outside the range of the present invention (No. 13 to
In 19), the Bs value was as low as 4100 G or less.
【００２７】これらに対し、Ｆｅ2 Ｏ3 、ＺｎＯ、Ｎｉ
Ｏの含有量、及びＺｎ／Ｎｉのモル比が本発明の範囲内
であるＮｏ．２０〜２４では、１１００〜１１６５℃の
低温で焼結し、透磁率が５２０以上と高く、かつＢｓ値
も４７００Ｇ以上と高いことがわかる。In contrast to these, Fe 2 O 3 , ZnO, Ni
When the content of O and the molar ratio of Zn / Ni are within the range of the present invention, No. It can be seen that Nos. 20 to 24 are sintered at a low temperature of 1100 to 1165 ° C., the magnetic permeability is as high as 520 or more, and the Bs value is as high as 4700 G or more.
【００２８】[0028]
【表２】 [Table 2]
【００２９】[0029]
【発明の効果】以上のように本発明によれば、５４〜７
５モル％のＦｅ2 Ｏ3 と、１０〜３０モル％のＺｎＯ
と、１０〜２５モル％のＮｉＯと、３〜１０モル％のＣ
ｕＯを主成分とし、Ｚｎ／Ｎｉのモル比が１〜１．５で
あって、かつ上記主成分１００重量部に対し、０．１〜
５重量部のＢｉ2 Ｏ3 と、０．１〜５重量部のＭｏＯ3
を含有することによって、優れた焼結性と透磁率を維持
したまま、Ｂｓ値を４１００Ｇ以上と高くすることがで
きる。As described above, according to the present invention, 54 to 7
5 mol% Fe 2 O 3 and 10-30 mol% ZnO
And 10 to 25 mol% NiO and 3 to 10 mol% C
uO as a main component, Zn / Ni molar ratio of 1 to 1.5, and 0.1 to 100 parts by weight of the main component.
5 parts by weight of Bi 2 O 3 and 0.1 to 5 parts by weight of MoO 3
By containing B, the Bs value can be increased to 4100 G or more while maintaining excellent sinterability and magnetic permeability.
【００３０】また、本発明によれば、上記高飽和磁束密
度フェライト材料でフェライトコアを形成したことによ
って、小型にしても大きな電流を流すことが可能とな
る。したがって、このフェライトコアを電源用に用いれ
ば、各種電子機器の小型化に貢献することができる。Further, according to the present invention, since the ferrite core is formed of the above-mentioned high saturation magnetic flux density ferrite material, it becomes possible to flow a large current even if the size is reduced. Therefore, if this ferrite core is used for a power supply, it can contribute to miniaturization of various electronic devices.
【図１】（ａ）（ｂ）は本発明のフェライトコアを示す
斜視図である。1A and 1B are perspective views showing a ferrite core of the present invention.
【図２】本発明のフェライトコアの磁束密度を測定する
方法を説明するための図である。FIG. 2 is a diagram for explaining a method for measuring the magnetic flux density of the ferrite core of the present invention.
１：トロイダルコア ２：ボビン状コア ３：１次側巻き線 ４：２次側巻き線 ５：電源 ６：磁束計 1: Toroidal core 2: Bobbin-shaped core 3: Primary winding 4: Secondary winding 5: Power supply 6: Magnetic flux meter
Claims (2)
３０モル％のＺｎＯと、１０〜２５モル％のＮｉＯと、
３〜１０モル％のＣｕＯを主成分とし、Ｚｎ／Ｎｉのモ
ル比が１〜１．５であって、かつ上記主成分１００重量
部に対し、０．１〜５重量部のＢｉ2 Ｏ3 と、０．１〜
５重量部のＭｏＯ3 を含有することを特徴とする高飽和
磁束密度フェライト材料。1. Fe 2 O 3 of 54-75 mol%, and 10-
30 mol% ZnO, 10-25 mol% NiO,
3 to 10 mol% CuO as a main component, Zn / Ni molar ratio is 1 to 1.5, and 0.1 to 5 parts by weight of Bi 2 O 3 with respect to 100 parts by weight of the above main component. And 0.1
A high saturation magnetic flux density ferrite material characterized by containing 5 parts by weight of MoO 3 .
イト材料を所定形状に形成してなるフェライトコア。2. A ferrite core obtained by forming the high saturation magnetic flux density ferrite material according to claim 1 into a predetermined shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20237896A JP3464100B2 (en) | 1996-07-31 | 1996-07-31 | High saturation magnetic flux density ferrite material and ferrite core using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20237896A JP3464100B2 (en) | 1996-07-31 | 1996-07-31 | High saturation magnetic flux density ferrite material and ferrite core using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1045415A JPH1045415A (en) | 1998-02-17 |
| JP3464100B2 true JP3464100B2 (en) | 2003-11-05 |
Family
ID=16456512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20237896A Expired - Fee Related JP3464100B2 (en) | 1996-07-31 | 1996-07-31 | High saturation magnetic flux density ferrite material and ferrite core using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3464100B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5196704B2 (en) | 2004-03-12 | 2013-05-15 | 京セラ株式会社 | Method for producing ferrite sintered body |
| CN105481360A (en) * | 2015-11-27 | 2016-04-13 | 全椒君鸿软磁材料有限公司 | Preparation method of high saturation magnetic flux density soft magnetic ferrite magnetic core material |
| CN105481359A (en) * | 2015-11-27 | 2016-04-13 | 全椒君鸿软磁材料有限公司 | Preparation method of high performance large power soft-magnetic ferrite magnetic core material |
| CN109336578A (en) * | 2018-06-22 | 2019-02-15 | 横店集团东磁股份有限公司 | A kind of NiCuZn Ferrite Material and its preparation method and application |
| CN114242371B (en) * | 2021-12-27 | 2023-06-13 | 标旗磁电产品(佛冈)有限公司 | Nickel-zinc ferrite particle material and preparation method and application thereof |
-
1996
- 1996-07-31 JP JP20237896A patent/JP3464100B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1045415A (en) | 1998-02-17 |
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