JP4102673B2 - Ferrite - Google Patents
Ferrite Download PDFInfo
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- JP4102673B2 JP4102673B2 JP2003007417A JP2003007417A JP4102673B2 JP 4102673 B2 JP4102673 B2 JP 4102673B2 JP 2003007417 A JP2003007417 A JP 2003007417A JP 2003007417 A JP2003007417 A JP 2003007417A JP 4102673 B2 JP4102673 B2 JP 4102673B2
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- oxide
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Description
【0001】
【発明の属する技術分野】
本発明は、インダクタンス素子のコア材として使用され、特に樹脂モールドタイプのチップインダクタのコア材として使用されるフェライトと、このフェライトをコア材に用いたインダクタンス素子に関する。
【0002】
【従来の技術】
電子機器に多数使用されているインダクタンス素子のコア材としては鉛を含むフェライトが多く使用されてきている。しかし、電子機器はいずれは廃棄物として環境中に廃棄されることになるので、インダクタンス素子のコア材中に含まれている鉛は環境中に拡散し、人間を含めた生物に悪影響を及ぼすおそれがある。従って、インダクタンス素子のコア材としては鉛を含まないフェライトを使用するのが望ましい。そこで、近年、鉛を含まないコア材及びインダクタンス素子が種々提案されている。
【0003】
例えば、特開平11−087126号公報には、Fe,Ni,Cu及びZnの酸化物を主成分とし、これに第1副成分(酸化ビスマス、酸化バナジウム、酸化リンおよび酸化ホウ素の1種または2種以上と酸化シリコン)及び第2副成分(酸化マグネシウム、酸化カルシウムおよび酸化ストロンチウムの1種または2種以上)を添加したものが開示されている。
【0004】
ここで、第1副成分は0.1〜10.0wt%、第2副成分は0.1〜10.0wt%、第1副成分+第2副成分の添加物の比率は主成分の0.5〜15wt%である。そして、このフェライトは、98MPaの圧力で加圧したときのインダクタンスの変化率は−5%〜+5%以内となっている。
【0005】
また、特開2002−134312号公報には、Fe,Ni,Cu,Mg及びZnの酸化物を主成分とし、Co、Bi及びSiの酸化物を副成分として含むフェライトが開示されている。
【0006】
ここで、主成分は、鉄の酸化物がFe 2 O 3 換算で45.0〜51.0モル%、銅の酸化物がCuO換算で0.5〜15.0モル%、亜鉛の酸化物がZnO換算で0〜33.0モル%、マグネシウムの酸化物がMgO換算で0.1〜5.0モル%、及び残部酸化ニッケルとなっている。
【0007】
また、副成分は、この主成分に対してコバルト酸化物がCo 3 O 4 換算で0.05〜1.0重量%の範囲、ビスマス酸化物がBi 2 O 3 換算で0.5〜7.0重量%の範囲、ケイ素酸化物がSiO 2 換算で0〜5.0重量%の範囲で添加されている。
【0008】
そして、このフェライトは樹脂モールド型のインダクタンス素子に使用されるものであり、インダクタンスの加圧変化特性として49MPaの圧力で加圧したときのインダクタンスの変化率が種々記載されている。
【0009】
【発明が解決しようとする課題】
ところで、近年における技術の進歩はとどまるところがなく、フェライト及びインダクタンス素子についても、鉛を含まず、電気的特性が優れ、信頼性が高くかつ安価なものが望まれている。
【0010】
また、一定形状・大きさのインダクタンス素子についてインダクタンス値を大きくするためには、コアの芯径を細くし、巻数を多くする必要がある。しかし、このようにすると、モールドした樹脂による外部応力が強くかかるため、安定したインダクタンス値を有するインダクタンス素子を作るために高圧下(196MPa)での応力特性が重要となってくる。
【0011】
本発明は、鉛を含まず、初透磁率が高く、安価で、196MPaの圧力で加圧したときのインダクタンスの抗応力特性に優れ、また、狭交差および高信頼性を備えたフェライト及びこのフェライトをコアとして使用したインス素子を提供することである。
【0012】
【課題を解決するための手段】
この発明に係るフェライトは、Fe,Ni,Cu,Mg及びZnの酸化物を主成分とし、Co、Bi及びSiの酸化物を副成分として含み、含まれているBi及びSiの酸化物の重量比がBi2O3/SiO2として1.29〜1.82、Bi及びSiの酸化物の合計重量がBi2O3+SiO2として4.99〜6.13重量%である。
【0013】
ここで、Bi及びSiの酸化物の重量比をBi2O3/SiO2として1.29〜1.82、Bi及びSiの酸化物の合計重量をBi2O3+SiO2として4.99〜6.13重量%の範囲としたのは、Bi2O3/SiO2が1.82を超えかつBi2O3+SiO2が6.13を超えると98MPaの変化率ΔL1/L、196MPaの変化率ΔL2/Lが悪くなり、Bi2O3/SiO2が1.29未満かつBi2O3+SiO2が4.99未満では98MPaの変化率ΔL1/L、196MPaの変化率ΔL2/Lが悪くなり、Q値が低くなるが、上記範囲であれば所望の特性のものが得られるからである。
【0014】
また、この発明に係るフェライトは、Fe,Ni,Cu,Mg及びZnの酸化物を主成分とし、Co、Bi及びSiの酸化物を副成分として含み、Bi及びSiの酸化物を、Bi2O3及びSiO2の重量%で示すグラフ(図1)において、Bi2O3が2.81wt%、SiO2が2.18wt%の組成を示す第1の点Aと、Bi2O3が3.45wt%、SiO2が2.68wt%の組成を示す第2の点Bと、Bi2O3が3.96wt%、SiO2が2.17wt%の組成を示す第3の点Cと、Bi2O3が3.22wt%、SiO2が1.77wt%の組成を示す第4の点Dとをこの順に結ぶ4本の直線で囲まれた領域内にある。
【0015】
ここで、Bi及びSiの酸化物を、Bi2O3及びSiO2の重量%で示すグラフの第1〜第4の点A〜点Dをこの順に結ぶ4本の直線で囲まれた領域内としたのは、Bi及びSiの酸化物をこの領域内とすれば、所望の特性を有するフェライトを得ることができるが、Bi及びSiの酸化物をこの範囲外とすれば所望の特性を有するフェライトを得ることができないからである。
【0016】
また、この発明に係るフェライトは、98MPaの圧力で加圧したときのインダクタンスの変化率が−5%〜+5%以内であり、196MPaの圧力で加圧したときのインダクタンスの変化率が−10%〜+10%以内である。
【0017】
また、この発明に係るインダクタンス素子は、上記フェライトがコアとして使用され、このコアにコイルが巻回され、これらが合成樹脂でモールドされているものである。
【0018】
【実施例】
主成分の原料粉末として、Fe2O3を47.4モル%、NiOを31.0モル%、ZnOを16.9モル%、MgOを3.1モル%、CuOを3.6モル%の割合で秤量した。また、副成分の原料粉末として、Co3O4を主成分の重量の0.08重量%、Bi2O3、SiO2を表1に示す割合(主成分に対する重量%)で秤量した。
【0019】
【表1】
【0020】
次に、これら主成分及び副成分の原料粉末をボールミルに入れ、2時間混合し、得られた混合物を空気中において900℃で2時間仮焼した。
【0021】
次に、この仮焼粉をボールミルに入れ、比表面積が3m2/gとなるように湿式で混合・粉砕し、磁性材料(試料1〜3、比較試料1〜2)を得た。ここで、比表面積は、株式会社島津製作所製の比表面積測定装置フローソーブII 2300形でBET一点法により測定した。
【0022】
次に、粉砕後の混合物を乾燥させ、ポリビニルアルコールを1.0wt%加えて混合し、196MPaの圧力で加圧成形して、寸法が7mmφ×15mmの円柱状の成形体を得、この成形体を、空気中において1050℃で2時間焼成し、フェライトからなる円柱状のコアサンプルを得た。
【0023】
次に、コアサンプルの中央部にワイヤを20回巻回し、このコアサンプルの両端面に一定圧力で一軸圧縮力を印加し、このときのインダクタンス値をLCRメータにて連続的に測定し、得られた測定値からインダクタンス変化率を算出した。表2に、98MPa、196MPaの一軸圧縮力を印加したときのインダクタンス変化率ΔL/Lを示す。
【0024】
【表2】
【0025】
焼結密度(見かけ密度)は、焼結体の焼結性の良し悪しを判断するためのものである。焼結密度が低い場合は焼結体の内部の空孔が多くなり、素子化した場合、高い温湿度で使用するとこの空孔が原因となって、ショート不良等を生じ、信頼性に影響を及ぼしたり、物理的強度が脆弱となる。このような問題を生じさせない焼結密度は、一般に5g/cm3以上である。
【0026】
Q(25MHz)は上記コアサンプルをJISコイル6φ用に入れ、LCRメーター4285A、42851Aで25MHzのQ値を測定した。
【0027】
試料1〜3は、Bi2O3、SiO2含有量を本発明の規定範囲内で変化させ、比較試料1,2はBi2O3、SiO2含有量が本発明から外れるものとした。
【0028】
焼結密度は全て5g/cm3程度である。また試料1〜3、比較例1は、充分なQ値をもつ。また、比較例1,2は外部応力に対するインダクタンスの変化率が98MPaで−5%〜+5%の範囲を超え、196MPaで−10%〜+10%の範囲を超えるものであった。
【0029】
表1、表2から、重量比Bi2O3/SiO2が1.82を超えかつ合計重量Bi2O3+SiO2が6.13を超えると98MPa、196MPaの加圧変化率ΔL1/L、ΔL2/Lが悪くなることがわかる。
【0030】
また、表1、表2から、重量比Bi2O3/SiO2が1.29未満かつ合計重量Bi2O3+SiO2が4.99未満になると98MPa、196MPaの変化率ΔL1/L、ΔL2/Lが悪くなり、また、Q値も低くなることがわかる。
【0031】
【発明の効果】
この発明は、高周波領域におけるQ値が充分に高く、かつ圧縮応力に対するインダクタンス変化率が小さいフェライトを得ることができ、その結果、高周波領域において高い信頼性と優れた性能を備えたインダクタンス素子を得ることができるという効果がある。
【0032】
また、この発明は、圧縮応力に対するインダクタンス変化率が小さいフェライトを得ることができるので、インダクタンス素子の設計においてインダクタンス値のねらいが絞り易くなり、インダクタンス素子の設計がし易くなるという効果がある。
【図面の簡単な説明】
【図1】本発明に係るフェライトに含まれるSiO2とBi2O3の範囲を示すグラフである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ferrite used as a core material of an inductance element, and particularly to a ferrite used as a core material of a resin mold type chip inductor, and an inductance element using the ferrite as a core material.
[0002]
[Prior art]
As a core material of an inductance element used in a large number of electronic devices, ferrite containing lead has been often used. However, since electronic devices will eventually be disposed of as waste in the environment, lead contained in the core material of the inductance element may diffuse into the environment and adversely affect living organisms including humans. There is. Therefore, it is desirable to use a lead-free ferrite as the core material of the inductance element. Therefore, in recent years, various core materials and inductance elements not containing lead have been proposed.
[0003]
For example, JP-A-11-087126 discloses an oxide of Fe, Ni, Cu and Zn as a main component, and a first subcomponent (one or two of bismuth oxide, vanadium oxide, phosphorus oxide and boron oxide). The thing which added the seed | species or more and silicon oxide) and the 2nd subcomponent (one sort or two sorts of magnesium oxide, calcium oxide, and strontium oxide) is indicated.
[0004]
Here, the first subcomponent is 0.1 to 10.0 wt%, the second subcomponent is 0.1 to 10.0 wt%, and the ratio of the additive of the first subcomponent and the second subcomponent is 0% of the main component. .5 to 15 wt%. And this ferrite has a rate of change of inductance within -5% to + 5% when pressed at a pressure of 98 MPa.
[0005]
Japanese Patent Application Laid-Open No. 2002-134312 discloses a ferrite containing an oxide of Fe, Ni, Cu, Mg and Zn as a main component and an oxide of Co, Bi and Si as subcomponents.
[0006]
Here, the main components are iron oxide 45.0 to 51.0 mol% in terms of Fe 2 O 3 , copper oxide 0.5 to 15.0 mol% in terms of CuO, zinc oxide Is 0 to 33.0 mol% in terms of ZnO, the oxide of magnesium is 0.1 to 5.0 mol% in terms of MgO, and the remaining nickel oxide.
[0007]
In addition, as for the subcomponent, cobalt oxide is in the range of 0.05 to 1.0% by weight in terms of Co 3 O 4 and bismuth oxide is 0.5 to 7 in terms of Bi 2 O 3 with respect to this main component. Silicon oxide is added in the range of 0 to 5.0% by weight in terms of SiO 2 in the range of 0% by weight.
[0008]
This ferrite is used for a resin mold type inductance element, and various inductance change rates when pressure is applied at a pressure of 49 MPa are described as the inductance change characteristics.
[0009]
[Problems to be solved by the invention]
By the way, in recent years, there has been no progress in technology, and there is a demand for ferrite and inductance elements that do not contain lead, have excellent electrical characteristics, have high reliability, and are inexpensive.
[0010]
In order to increase the inductance value of an inductance element having a fixed shape and size, it is necessary to reduce the core diameter and increase the number of turns. However, when this is done, external stress due to the molded resin is strongly applied, and stress characteristics under high pressure ( 196 MPa ) become important in order to produce an inductance element having a stable inductance value.
[0011]
The present invention does not contain lead, has a high initial permeability, is inexpensive, has excellent anti-stress characteristics of inductance when pressed at a pressure of 196 MPa, and has a narrow crossing and high reliability, and this ferrite It is to provide an ins element using as a core.
[0012]
[Means for Solving the Problems]
The ferrite according to the present invention contains Fe, Ni, Cu, Mg and Zn oxides as main components, Co, Bi and Si oxides as subcomponents, and the weight of the contained Bi and Si oxides. The ratio is 1.29 to 1.82 as Bi 2 O 3 / SiO 2 and the total weight of Bi and Si oxides is 4.99 to 6.13 wt% as Bi 2 O 3 + SiO 2 .
[0013]
Here, the weight ratio of Bi and Si oxide is 1.29 to 1.82 as Bi 2 O 3 / SiO 2 , and the total weight of Bi and Si oxide is 4.99 to 2 as Bi 2 O 3 + SiO 2 . The range of 6.13% by weight is that when Bi 2 O 3 / SiO 2 exceeds 1.82 and Bi 2 O 3 + SiO 2 exceeds 6.13, the rate of change ΔL 1 / L of 196 MPa is 98 MPa. When the rate of change ΔL 2 / L becomes worse, Bi 2 O 3 / SiO 2 is less than 1.29 and Bi 2 O 3 + SiO 2 is less than 4.99, the rate of change ΔL 1 / L of 98 MPa and the rate of change ΔL 2 of 196 MPa This is because / L becomes worse and the Q value becomes lower, but the desired characteristics can be obtained within the above range.
[0014]
In addition, the ferrite according to the present invention includes an oxide of Fe, Ni, Cu, Mg and Zn as a main component, an oxide of Co, Bi and Si as subcomponents, and an oxide of Bi and Si as Bi 2. In the graph (FIG. 1) represented by weight percent of O 3 and SiO 2 , Bi 2 O 3 is 2.81 wt%, SiO 2 is 2.18 wt%, the first point A showing the composition, and Bi 2 O 3 is 3.45wt%, and B second point SiO 2 shows a composition of 2.68wt%, Bi 2 O 3 is 3.96wt%, and C a third point where SiO 2 is the composition of 2.17Wt% , Bi 2 O 3 is 3.22 wt%, and SiO 2 is 1.77 wt% in the region surrounded by the four straight lines connecting the fourth point D showing the composition in this order.
[0015]
Here, in a region surrounded by four straight lines connecting the first to fourth points A to D of the graph showing the oxides of Bi and Si in terms of weight percent of Bi 2 O 3 and SiO 2 . The reason is that if Bi and Si oxides are included in this region, ferrite having desired characteristics can be obtained, but if Bi and Si oxides are out of this range, desired characteristics are obtained. This is because ferrite cannot be obtained.
[0016]
Also, the ferrite according to the invention is inductance change ratio within 5% ~ + 5% when pressed at a pressure of 98 MPa, the inductance change ratio when pressurized at a pressure of 196MPa -10% Within + 10%.
[0017]
In the inductance element according to the present invention, the ferrite is used as a core, a coil is wound around the core, and these are molded with a synthetic resin.
[0018]
【Example】
As the raw material powder of the main component, 47.4 mol% of Fe 2 O 3 , 31.0 mol% of NiO, 16.9 mol% of ZnO, 3.1 mol% of MgO, and 3.6 mol% of CuO Weighed in proportion. In addition, as raw material powders for the subcomponents, Co 3 O 4 was weighed in a ratio of 0.08% by weight of the main component, and Bi 2 O 3 and SiO 2 in the proportions shown in Table 1 (% by weight with respect to the main component).
[0019]
[Table 1]
[0020]
Next, the raw material powders of these main components and subcomponents were placed in a ball mill and mixed for 2 hours, and the resulting mixture was calcined at 900 ° C. for 2 hours in air.
[0021]
Next, this calcined powder was put in a ball mill, and mixed and pulverized by a wet method so that the specific surface area was 3 m 2 / g to obtain magnetic materials (Samples 1 to 3 and Comparative Samples 1 and 2). Here, the specific surface area was measured by a BET one-point method using a specific surface area measuring apparatus Flowsorb II 2300 manufactured by Shimadzu Corporation.
[0022]
Next, the pulverized mixture is dried, 1.0 wt% of polyvinyl alcohol is added and mixed, and pressure molding is performed at a pressure of 196 MPa to obtain a cylindrical molded body having a size of 7 mmφ × 15 mm. Was fired in air at 1050 ° C. for 2 hours to obtain a cylindrical core sample made of ferrite.
[0023]
Next, a wire is wound around the center of the core sample 20 times, a uniaxial compressive force is applied to both end faces of the core sample at a constant pressure, and the inductance value at this time is continuously measured with an LCR meter. The inductance change rate was calculated from the measured values. Table 2 shows the inductance change rate ΔL / L when a uniaxial compressive force of 98 MPa and 196 MPa is applied.
[0024]
[Table 2]
[0025]
The sintered density (apparent density) is for judging whether the sintered body is good or bad in sinterability. When the sintered density is low, the number of voids inside the sintered body increases, and when it is made into an element, if it is used at high temperature and humidity, this void causes a short circuit failure and affects reliability. Exerts a weak physical strength. The sintered density that does not cause such a problem is generally 5 g / cm 3 or more.
[0026]
For Q (25 MHz), the above core sample was put into a JIS coil 6φ, and the Q value at 25 MHz was measured with an LCR meter 4285A, 42851A.
[0027]
In Samples 1 to 3, the Bi 2 O 3 and SiO 2 contents were changed within the specified range of the present invention, and in Comparative Samples 1 and 2, the Bi 2 O 3 and SiO 2 contents were excluded from the present invention.
[0028]
The sintered density is about 5 g / cm 3 in all cases. Samples 1 to 3 and Comparative Example 1 have sufficient Q values. In Comparative Examples 1 and 2, the rate of change in inductance with respect to external stress was 98 MPa, exceeding the range of -5% to + 5%, and exceeding 196 MPa to + 10% at 196 MPa.
[0029]
From Table 1 and Table 2, when the weight ratio Bi 2 O 3 / SiO 2 exceeds 1.82 and the total weight Bi 2 O 3 + SiO 2 exceeds 6.13, the pressure change rate ΔL 1 / L of 98 MPa and 196 MPa. It can be seen that ΔL 2 / L is deteriorated.
[0030]
Further, from Tables 1 and 2, when the weight ratio Bi 2 O 3 / SiO 2 is less than 1.29 and the total weight Bi 2 O 3 + SiO 2 is less than 4.99, the change rate ΔL 1 / L of 98 MPa and 196 MPa, It can be seen that ΔL 2 / L is deteriorated and the Q value is also decreased.
[0031]
【The invention's effect】
According to the present invention, a ferrite having a sufficiently high Q value in a high frequency region and a small inductance change rate with respect to a compressive stress can be obtained. As a result, an inductance element having high reliability and excellent performance in a high frequency region is obtained. There is an effect that can be.
[0032]
In addition, since the present invention can provide a ferrite having a small inductance change rate with respect to compressive stress, it is easy to narrow down the aim of the inductance value in the design of the inductance element, and it is easy to design the inductance element.
[Brief description of the drawings]
FIG. 1 is a graph showing a range of SiO 2 and Bi 2 O 3 contained in a ferrite according to the present invention.
Claims (3)
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JP2003007417A JP4102673B2 (en) | 2003-01-15 | 2003-01-15 | Ferrite |
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JP2003007417A JP4102673B2 (en) | 2003-01-15 | 2003-01-15 | Ferrite |
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JP4102673B2 true JP4102673B2 (en) | 2008-06-18 |
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JP4823531B2 (en) * | 2005-01-25 | 2011-11-24 | 太陽誘電株式会社 | Magnetic oxide material |
JP4835969B2 (en) * | 2005-03-28 | 2011-12-14 | 日立金属株式会社 | Magnetic oxide material and multilayer inductor using the same |
JP6465240B1 (en) * | 2018-05-28 | 2019-02-06 | Tdk株式会社 | Ferrite composition and laminated electronic component |
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