JP3317229B2 - Magnetic dielectric composite porcelain - Google Patents
Magnetic dielectric composite porcelainInfo
- Publication number
- JP3317229B2 JP3317229B2 JP02097298A JP2097298A JP3317229B2 JP 3317229 B2 JP3317229 B2 JP 3317229B2 JP 02097298 A JP02097298 A JP 02097298A JP 2097298 A JP2097298 A JP 2097298A JP 3317229 B2 JP3317229 B2 JP 3317229B2
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- Prior art keywords
- dielectric
- magnetic
- weight
- composite
- silver
- Prior art date
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電子機器の高周波
ノイズ対策用ＥＭＩフィルタ用の誘電体としての性質と
磁性体としての性質を合わせ持つ磁性体誘電体複合磁器
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic / dielectric composite ceramic having both properties as a dielectric and a property as a magnetic material for an EMI filter for high frequency noise suppression of electronic equipment.
【０００２】[0002]
【従来の技術】電子機器の高周波ノイズ対策用として、
ＥＭＩ（Ｅｌｅｃｔｏｒｏ Ｍａｇｕｎｅｔｉｃ Ｉｎ
ｎｔｅｒｆｅｒａｎｎｃｅ）フィルタが多く用いられて
いる。一般的に使用されているＥＭＩフィルタは、コン
デンサとインダクタンスとを個々に組み合わせて構成さ
れている。2. Description of the Related Art For countermeasures against high frequency noise of electronic equipment,
EMI (Electro Magnetic In)
(interference) filters are often used. A commonly used EMI filter is configured by individually combining a capacitor and an inductance.
【０００３】しかし、コンデンサとインダクタンスとを
組み合わせたものは、実装する際に広い面積を必要とす
ることから、電子機器の小型化が要求されている現状に
適合しない。[0003] However, a combination of a capacitor and an inductance requires a large area for mounting, and thus is not suitable for the current situation where downsizing of electronic equipment is required.
【０００４】そこで、磁性体の層と誘電体の層とを交互
に積層して両者を一体化した複合素子の中に、銀電極な
どでコイルを形成したものが提案されている。しかし、
このようなフィルタであっても、その積層構造上、複合
に際して大きな面積を必要とすることに変わりがない。In view of the above, there has been proposed a composite device in which a magnetic material layer and a dielectric material layer are alternately laminated to form a coil with a silver electrode or the like in a composite device in which the two are integrated. But,
Even with such a filter, the laminated structure still requires a large area for compounding.
【０００５】そこでこのような従来技術の問題点を解決
すべく、磁性体と誘電体とが混合焼成された複合磁器の
内部に銀電極などでコイルを形成したノイズフィルタが
提案されている（特開平２−２４９２９４号公報）。In order to solve the problems of the prior art, a noise filter has been proposed in which a coil is formed by a silver electrode or the like inside a composite porcelain in which a magnetic material and a dielectric material are mixed and fired (particularly). JP-A-2-249294).
【０００６】[0006]
【発明が解決しようとする課題】しかし、磁性体と誘電
体とを混合、焼成して複合化した場合、得られる複合磁
器の透磁率、誘電率はそれぞれの材料の体積比に対して
対数関数的に増減することから、このように複合化する
ことによって、複合前の各々の単独材料の示す特性より
透磁率、誘電率ともに極度に小さくなる。従って、この
複合磁器を用いてＥＭＩフィルタを作製すると、静電容
量ＣやインダクタンスＬの制限を受けることによって、
製品の大容量化や小型化が困難であるという欠点があっ
た。However, when a magnetic substance and a dielectric substance are mixed and fired to form a composite, the magnetic permeability and dielectric constant of the resulting composite porcelain are logarithmic functions with respect to the volume ratio of each material. Thus, by forming such a composite, both the magnetic permeability and the dielectric constant become extremely smaller than the characteristics exhibited by each single material before the composite. Therefore, when an EMI filter is manufactured using this composite porcelain, the capacitance C and the inductance L are limited.
There is a drawback that it is difficult to increase the capacity and reduce the size of the product.
【０００７】本発明は上記従来の問題点を解決し、複合
化による特性の低下を防止し、とりわけ、誘電率の良好
な磁性体誘電体複合磁器を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems, to prevent a decrease in characteristics due to compounding, and to provide a magnetic-dielectric composite ceramic having an excellent dielectric constant.
【０００８】[0008]
【課題を解決するための手段】本発明の磁性体誘電体複
合磁器は、フェライト系磁性体１０〜９０重量％及びペ
ロブスカイト系誘電体９０〜１０重量％を含む複合材料
１００重量部に対して銀０．５〜１５重量部を添加して
なることを特徴とする。According to the present invention, there is provided a magnetic dielectric composite porcelain comprising silver based on 100 parts by weight of a composite material containing 10 to 90% by weight of a ferrite-based magnetic substance and 90 to 10% by weight of a perovskite-based dielectric. It is characterized by adding 0.5 to 15 parts by weight.
【０００９】本発明によれば、フェライト系磁性体とペ
ロブスカイト系誘電体とに、更に銀を添加することで磁
器の誘電率を高めることができる。即ち、銀を添加する
と磁性体粒子と誘電体粒子との間の結合が強固となるた
めに、誘電率が大きくなる。According to the present invention, the dielectric constant of the porcelain can be increased by further adding silver to the ferrite-based magnetic material and the perovskite-based dielectric. That is, when silver is added, the bond between the magnetic particles and the dielectric particles is strengthened, so that the dielectric constant increases.
【００１０】なお、本発明においては、銀を添加してい
るが、銀に限らず、金、白金、パラジウム等の貴金属で
あっても同様の作用を得ることができる。ただし、これ
らの貴金属は融点が比較的高く、かつ価格が非常に高い
ので、ＥＭＩフィルタの価格を上昇させることから、本
発明においてはこれらの貴金属ではなく、銀を用いる。Although silver is added in the present invention, the same effect can be obtained not only with silver but also with noble metals such as gold, platinum and palladium. However, since these noble metals have relatively high melting points and are very expensive, they increase the price of the EMI filter. Therefore, in the present invention, silver is used instead of these noble metals.
【００１１】本発明の磁性体誘電体複合磁器は、更に焼
結助材を含むことが好ましく、この場合、焼結助材とし
ては、ＣｄＯ−ＺｎＯ−Ｂ2 Ｏ3 を主成分とするものが
好適である。The magnetic / dielectric composite ceramic of the present invention preferably further contains a sintering aid. In this case, the sintering aid is mainly composed of CdO—ZnO—B 2 O 3. It is suitable.
【００１２】[0012]
【発明の実施の形態】以下に本発明の実施の形態を詳細
に説明する。Embodiments of the present invention will be described below in detail.
【００１３】本発明において、フェライト系磁性体とし
ては、Ｃｕ、Ｎｉ、Ｚｎ、Ｃｏ、Ｎｉ、Ｃｒ、Ｍｎ、Ａ
ｌ及びＦｅ等の金属の酸化物で構成されたもの、特に、
Ｃｕ，Ｎｉ系、Ｃｕ，Ｎｉ，Ｚｎ系のものを好適に用い
ることができる。In the present invention, ferrite-based magnetic materials include Cu, Ni, Zn, Co, Ni, Cr, Mn, and A.
1 and those composed of oxides of metals such as Fe,
Cu, Ni-based, Cu, Ni, and Zn-based ones can be suitably used.
【００１４】また、誘電体としては誘電率の高いペロブ
スカイト系のものを用いるが、ペロブスカイト系の誘電
体の中でも、比較的焼成温度が低いことから、チタン酸
鉛系のものを好適に用いることができる。チタン酸鉛系
のペロブスカイトとしては、チタン酸鉛（ＰｂＯ・Ｔｉ
Ｏ2 ）、ＰＺＴ（ＰｂＯ・（ＺｒＯ2 ）n ・（Ｔｉ
Ｏ2 ）1-n ）、ＰＬＺＴ（ＰｂＯx ・（ＬａＯ3/2 ）
1-x ・（ＺｒＯ2 ）v ・（ＴｉＯ2 ）1-v ）を好適に用
いることができる。As the dielectric, a perovskite-based dielectric having a high dielectric constant is used. Among the perovskite-based dielectrics, a lead titanate-based dielectric is preferably used because the firing temperature is relatively low. it can. Lead titanate-based perovskites include lead titanate (PbO.Ti
O 2 ), PZT (PbO. (ZrO 2 ) n. (Ti
O 2 ) 1-n ), PLZT (PbO x · (LaO 3/2 )
1-x · (ZrO 2) v · (TiO 2) 1-v) can be suitably used.
【００１５】銀としては、銀の粉末を添加することもで
きるが、高温で分解してＡｇとなるＡｇ2 ＯやＡｇＯ等
を用いても良い。As silver, silver powder can be added, but Ag 2 O, AgO or the like, which decomposes at high temperature to become Ag, may be used.
【００１６】本発明において、磁性体誘電体複合磁器中
の複合材料を構成するフェライト系磁性体の割合は１０
〜９０重量％の範囲である。フェライト系磁性体の割合
が９０重量％よりも多くなると誘電率が低くなり、１０
重量％より少なくなると透磁率が低くなる。また、ペロ
ブスカイト系誘電体の割合は１０〜９０重量％の範囲で
ある。ペロブスカイト系誘電体の割合が９０重量％より
多くなると透磁率が低くなり過ぎ、１０重量％より少な
いと誘電率が低くなり過ぎる。In the present invention, the ratio of the ferrite-based magnetic material constituting the composite material in the magnetic dielectric composite ceramic is 10%.
９０90% by weight. When the proportion of the ferrite-based magnetic material is more than 90% by weight, the dielectric constant becomes low,
When the amount is less than the weight%, the magnetic permeability decreases. The ratio of the perovskite-based dielectric is in the range of 10 to 90% by weight. When the proportion of the perovskite-based dielectric is more than 90% by weight, the magnetic permeability is too low, and when it is less than 10% by weight, the dielectric constant is too low.
【００１７】また、磁性体誘電体複合磁器中の銀の割合
は、このフェライト系磁性体及びペロブスカイト系誘電
体よりなる複合材料に対して０．５〜１５重量％の範囲
内である。銀の割合が０．５重量％未満であると誘電率
が上昇せず、１５重量％を超えると磁性体誘電体複合磁
器の内部で導通が起こり、誘電体としての機能が発揮で
きなくなる。銀の割合は２〜１４重量％とくに５〜１４
重量％が好ましい。The ratio of silver in the magnetic dielectric composite porcelain is in the range of 0.5 to 15% by weight based on the composite material comprising the ferrite magnetic substance and the perovskite dielectric. If the proportion of silver is less than 0.5% by weight, the dielectric constant does not increase, and if it exceeds 15% by weight, conduction occurs inside the magnetic-dielectric composite ceramic, and the function as a dielectric cannot be exhibited. The proportion of silver is 2-14% by weight, especially 5-14%.
% By weight is preferred.
【００１８】このような本発明の磁性体誘電体複合磁器
は、フェライト系磁性体粉末とペロブスカイト系誘電体
粉末と、銀又はＡｇ2 Ｏ等の銀生成物質を所定の割合で
混合し、常法に従って成形した後９００〜１０５０℃で
焼成することにより容易に製造することができる。The magnetic / dielectric composite ceramic of the present invention is prepared by mixing a ferrite-based magnetic powder, a perovskite-based dielectric powder, and a silver-forming substance such as silver or Ag 2 O at a predetermined ratio, by a conventional method. And then calcined at 900 to 1050 ° C. to produce easily.
【００１９】なお、磁性体誘電体複合磁器の製造に当っ
ては、更に焼結助材を添加しても良く、焼結助材の添加
により焼成温度を下げると共に、焼結体の強度を高める
ことができる。In the production of the magnetic dielectric composite porcelain, a sintering aid may be further added. The addition of the sintering aid lowers the firing temperature and increases the strength of the sintered body. be able to.
【００２０】この場合、焼結助材としては、磁性体若し
くは誘電体と反応しない、即ち透磁率及び誘電率に影響
を与えることなく、焼結温度のみを低下させるものであ
れば使用することが可能である。焼結助材としては、特
に、ＰｂＯ−ＺｎＯ−Ｂ2 Ｏ3 系の焼結助材を好適に用
いることができる。焼結助材を用いる場合、その使用割
合は前記複合材料に対する添加割合で０．１〜５重量％
とするのが好ましい。この割合が０．１重量％未満では
添加効果を得ることができず、５重量％を超えると透磁
率や誘電率に影響を与えるおそれがある。In this case, any sintering aid that does not react with the magnetic substance or the dielectric substance, that is, that reduces only the sintering temperature without affecting the magnetic permeability and the dielectric constant, may be used. It is possible. The sintering aids, in particular, can be suitably used PbO-ZnO-B 2 O 3 based sintering aid material. When a sintering aid is used, the proportion of the sintering additive is 0.1 to 5% by weight relative to the composite material.
It is preferred that If this ratio is less than 0.1% by weight, the effect of addition cannot be obtained, and if it exceeds 5% by weight, the magnetic permeability and the dielectric constant may be affected.
【００２１】[0021]
【実施例】以下に実施例及び比較例を挙げて本発明をよ
り具体的に説明するが、本発明はその要旨を超えない限
り、以下の実施例に限定されるものではない。The present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to the following examples unless it exceeds the gist.
【００２２】実施例１〜６，比較例１，２ ＰｂＯ、Ｌａ2 Ｏ3 、ＺｒＯ2 、ＴｉＯ2 の特級試薬を
８８：６：７０：３０のモル比となるように秤量し、混
合物を１１５０℃の温度で６時間焼成してＰＬＺＴ系ペ
ロブスカイト系誘電体Ｐｂ0.85Ｌａ0.12Ｚｒ0.70Ｔｉ
0.3 Ｏ3.06を得た。この誘電体を平均粒径２〜３μｍと
なるようにボールミルで粉砕して誘電体粉末Ｉを得た。Examples 1 to 6, Comparative Examples 1 and 2 Special grade reagents of PbO, La 2 O 3 , ZrO 2 and TiO 2 were weighed in a molar ratio of 88: 6: 70: 30, and the mixture was mixed with 1150. Baked at a temperature of 6 ° C. for 6 hours, PLZT-based perovskite-based dielectric Pb 0.85 La 0.12 Zr 0.70 Ti
0.3 O 3.06 was obtained. This dielectric material was pulverized with a ball mill so as to have an average particle diameter of 2 to 3 μm to obtain dielectric powder I.
【００２３】また、ＮｉＯ、ＺｎＯ、ＣｕＯ、Ｆｅ2 Ｏ
3 の特級試薬を２４：２２：６：４８のモル比となるよ
うに秤量し、混合物を９５０℃で６時間焼成してフェラ
イト系磁性体Ｎｉ0.24Ｚｎ0.22Ｃｕ0.06Ｆｅ0.96Ｏ1.96
を得た。この磁性体をボールミルで平均粒径１μｍとな
るように粉砕して磁性体粉末Ｉを得た。Also, NiO, ZnO, CuO, Fe 2 O
The special grade reagent No. 3 was weighed so as to have a molar ratio of 24: 22: 6: 48, and the mixture was calcined at 950 ° C. for 6 hours to obtain a ferrite magnetic substance Ni 0.24 Zn 0.22 Cu 0.06 Fe 0.96 O 1.96
I got This magnetic material was pulverized with a ball mill so as to have an average particle size of 1 μm to obtain a magnetic material powder I.
【００２４】誘電体粉末Ｉと磁性体粉末Ｉとを６：４
（重量比）の割合で混合し、この混合粉に対して、Ａｇ
の添加量が０（添加せず）、０．５、２．０、５、１
０、１４、１５、１８重量％となるようにＡｇ2 Ｏを添
加し、これを粉末プレス法で直径１５ｍｍ、厚さ１ｍｍ
の円柱状に成形した。この成形体を１０００℃で焼成し
て焼結体を得た。焼成時の収縮率は表１に示す通りであ
る。The dielectric powder I and the magnetic powder I are mixed in a ratio of 6: 4.
(Weight ratio), and the mixed powder was mixed with Ag.
0 (no addition), 0.5, 2.0, 5, 1
Ag 2 O was added so as to be 0, 14, 15, and 18% by weight, and this was powder-pressed to have a diameter of 15 mm and a thickness of 1 mm.
Into a cylindrical shape. This molded body was fired at 1000 ° C. to obtain a sintered body. The shrinkage during firing is as shown in Table 1.
【００２５】この焼結体について誘電率、誘電損失、透
磁率、抵抗率を測定し、結果を表１に示した。The sintered body was measured for permittivity, dielectric loss, magnetic permeability, and resistivity, and the results are shown in Table 1.
【００２６】[0026]
【表１】 [Table 1]
【００２７】表１の通り、本発明の磁性体誘電体複合磁
器は誘電率が高く、特に銀添加率２〜１４％とりわけ５
〜１４％の範囲では誘電率が著しく高く、しかも誘電損
失及び抵抗率が低い。As shown in Table 1, the magnetic-dielectric composite porcelain of the present invention has a high dielectric constant.
In the range of １４14%, the dielectric constant is extremely high, and the dielectric loss and the resistivity are low.
【００２８】実施例７ 実施例１で作製した誘電体粉末Ｉと磁性体粉末Ｉとを
６：４（重量比）の割合で混合し、この混合物にＡｇ添
加量が２．０重量％となるようにＡｇ2 Ｏを添加したも
の、並びに、この混合物にＡｇ添加量が２．０重量％と
なるようにＡｇ2Ｏを添加すると共に、さらに焼結助材
を２．０重量％添加したものを、それぞれ粉末プレス法
で直径１５ｍｍ，厚さ１ｍｍの円柱状に成形し、この成
形体を８５０℃で焼成して供試用の磁性体誘電体複合磁
器の２試料を得た。Example 7 The dielectric powder I and the magnetic powder I prepared in Example 1 were mixed at a ratio of 6: 4 (weight ratio), and the amount of Ag added to this mixture was 2.0% by weight. a material obtained by adding Ag 2 O as, well as those amount of Ag in the mixture with the addition of Ag 2 O so as to be 2.0 wt% was further added sintering aids 2.0 wt% Were molded into a columnar shape having a diameter of 15 mm and a thickness of 1 mm by a powder pressing method, and the molded body was fired at 850 ° C. to obtain two samples of a magnetic dielectric composite porcelain for a test.
【００２９】なお、焼結助材としては、特級試薬のＣｄ
Ｏ、ＺｎＯ、Ｂ2 Ｏ3 の当モルの混合物を７００℃で焼
成して得たＣｄＯ−ＺｎＯ−Ｂ2 Ｏ3 系のものを用い
た。As a sintering aid, a special grade reagent, Cd
O, ZnO, B equimolar mixture of the 2 O 3 things CdO-ZnO-B 2 O 3 system obtained by firing at 700 ° C. were used.
【００３０】得られた２試料につき、焼結状態の観察と
Ｘ線回折試験を行ったところ、焼結助材を添加した試料
は十分に焼結しており、Ｘ線回折のピークも磁性体及び
誘電体のもののみであったが、焼結助材を添加していな
い試料は焼結が不十分で若干脆かった。なお、これらの
２試料は、磁器特性においては、ほぼ同等の特性を示し
た。Observation of the sintering state and X-ray diffraction test were performed on the obtained two samples. As a result, the sample to which the sintering aid was added was sufficiently sintered, and the peak of the X-ray diffraction showed a magnetic substance. In addition, the sample containing only a dielectric material, but not containing a sintering aid, was insufficiently sintered and was slightly brittle. These two samples showed almost the same characteristics in porcelain characteristics.
【００３１】[0031]
【発明の効果】以上詳述した通り、本発明の磁性体誘電
体複合磁器によれば、電子機器の高周波ノイズ対策用Ｅ
ＭＩフィルタ用の誘電体としての性質と磁性体としての
性質を合わせ持つ磁性体誘電体複合磁器であって、特に
誘電率が優れた磁性体誘電体複合磁器が提供される。こ
のため、本発明の磁性体誘電体複合磁器によれば、その
優れた誘電特性により、ＥＭＩフィルタの小型、大容量
化を図ることが可能である。As described in detail above, according to the magnetic / dielectric composite ceramic of the present invention, a high frequency noise suppression E for electronic equipment is achieved.
Provided is a magnetic-dielectric composite ceramic having both properties as a dielectric for an MI filter and properties as a magnetic substance, and in particular, a magnetic-dielectric composite ceramic having an excellent dielectric constant. For this reason, according to the magnetic / dielectric composite ceramics of the present invention, the EMI filter can be reduced in size and increased in capacity due to its excellent dielectric properties.
フロントページの続き (56)参考文献 特開 平８−97662（ＪＰ，Ａ) 特開 平７−263280（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01F 27/00 H01G 4/40 Continuation of the front page (56) References JP-A-8-97662 (JP, A) JP-A-7-263280 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) H01F 27 / 00 H01G 4/40
Claims (3)
びペロブスカイト系誘電体９０〜１０重量％を含む複合
材料１００重量部に対して銀０．５〜１５重量部を添加
してなることを特徴とする磁性体誘電体複合磁器。The present invention is characterized in that 0.5 to 15 parts by weight of silver is added to 100 parts by weight of a composite material containing 10 to 90% by weight of a ferrite-based magnetic material and 90 to 10% by weight of a perovskite-based dielectric. And a magnetic-dielectric composite porcelain.
ことを特徴とする磁性体誘電体複合磁器。2. The magnetic dielectric composite porcelain according to claim 1, further comprising a sintering aid.
−ＺｎＯ−Ｂ2 Ｏ3を主成分とすることを特徴とする磁
性体誘電体複合磁器。3. The method according to claim 2, wherein the sintering aid is CdO.
Magnetic dielectric composite ceramic, characterized in that the main component -ZnO-B 2 O 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02097298A JP3317229B2 (en) | 1998-02-02 | 1998-02-02 | Magnetic dielectric composite porcelain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02097298A JP3317229B2 (en) | 1998-02-02 | 1998-02-02 | Magnetic dielectric composite porcelain |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11219826A JPH11219826A (en) | 1999-08-10 |
| JP3317229B2 true JP3317229B2 (en) | 2002-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02097298A Expired - Fee Related JP3317229B2 (en) | 1998-02-02 | 1998-02-02 | Magnetic dielectric composite porcelain |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2939990B1 (en) * | 2008-12-11 | 2016-02-19 | Commissariat Energie Atomique | THIN FILM WITH HIGH PERMITTIVITY AND PERMEABILITY. |
| CN116065075A (en) * | 2023-01-28 | 2023-05-05 | 哈尔滨工业大学 | Metal-relaxation ferroelectric ceramic with micro-nano composite structure and preparation method thereof |
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| JPH11219826A (en) | 1999-08-10 |
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