JP5651703B2 - 積層セラミックコンデンサ - Google Patents
積層セラミックコンデンサ Download PDFInfo
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- JP5651703B2 JP5651703B2 JP2012539651A JP2012539651A JP5651703B2 JP 5651703 B2 JP5651703 B2 JP 5651703B2 JP 2012539651 A JP2012539651 A JP 2012539651A JP 2012539651 A JP2012539651 A JP 2012539651A JP 5651703 B2 JP5651703 B2 JP 5651703B2
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- dielectric
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- ceramic capacitor
- multilayer ceramic
- internal electrode
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- H—ELECTRICITY
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- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
- H01G4/1218—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates
- H01G4/1227—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates based on alkaline earth titanates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B18/00—Layered products essentially comprising ceramics, e.g. refractory products
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- C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
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- Y10T29/435—Solid dielectric type
Description
Mn、V、Mo、Cu、B、Li、Ca、Srからなる副成分とからなる誘電体磁器組成物において、 前記誘電体磁器組成を、BaTiO3+aRe2O3+bMnO+cV2O5+dMoO3+eCuO+fB2O3+gLi2O+xSrO+yCaO(ただし、ReはEu、Gd、Dy、Ho、Er、Yb、及びYから選ばれる1種以上、a〜g、xおよびyはBaTiO3からなる主成分100molに対するmol数を示す。)で表記し、該誘電体磁気組成物に含まれる(Ba+Sr+Ca)/Tiのmol比をmとしたとき、 0.10≦a≦0.50 0.20≦b≦0.80 0≦c≦0.12 0≦d≦0.07 0.04≦c+d≦0.12 0≦e≦1.00 0.50≦f≦2.00 0.6≦(100(m−1)+2g)/2f≦1.3 0.5≦100(m−1)/2g≦5.1 0≦x≦1.5 0≦y≦1.5であることを特徴とする誘電体磁器組成物。[2]不純物として含まれるSiは、BaTiO3からなる主成分を100molとしたときにSiO2換算で1.0mol以下であることを特徴とする前記[1]の誘電体磁器組成物。[3]前記誘電体磁器組成を、(Ba1−v−wSrvCaw)TiO3+aRe2O3+bMnO+cV2O5+dMoO3+eCuO+fB2O3+gLi2O+xSrO+yCaOで表記したとき、 0≦x+v×100≦1.5 0≦y+w×100≦1.5としたことを特徴とする前記[1]〜[2]のいずれかの誘電体磁器組成物。[4]焼結温度が1030℃以下で緻密化させることが可能であることを特徴とする前記[1]〜[3]のいずれかの誘電体磁器組成物。[5]複数の誘電体セラミック層と、該誘電体セラミック層間に対向して形成された内部電極を有する積層セラミックコンデンサにおいて、前記誘電体セラミック層が、前記[1]〜[4]のいずれかの誘電体磁器組成物で構成された焼結体であり、前記内部電極は、CuまたはCu合金で構成されていることを特徴とする積層セラミックコンデンサ。[6]前記積層セラミックコンデンサが、複数の誘電体セラミック層と、該誘電体セラミック層間に対向して形成され、交互に異なる端面へ引出されるように形成された内部電極と、前記誘電体セラミック層の両端面に形成され、前記内部電極のそれぞれに電気的に接続された外部電極とを有することを特徴とする前記[5]の積層セラミックコンデンサ。[7]BaTiO3系化合物からなる主成分原料に、副成分原料として少なくともRe(ここで、Reは、Eu、Gd、Dy、Ho、Er、Yb、及びYから選ばれる1種以上)、Mn、B、およびLiと、更にV、Moのうち1種以上と、或いは更にCuやBa、Sr、Caを、酸化物やガラス、その他の化合物などの形態で含むセラミック原料を準備する工程と、該セラミック原料を用いてセラミックグリーンシートを形成するシート形成工程と、該セラミックグリーンシートにCuを主成分とする内部電極パターンを印刷する印刷工程と、該印刷工程を経たセラミックグリーンシートを積層して積層体を形成する積層工程と、該積層体を内部電極パターン毎に裁断してチップ状の積層体を得る裁断工程と、該裁断工程で得られたチップ状の積層体を1030℃以下の温度で還元性雰囲気にて焼成して焼結体を得る焼成工程と、該焼結体の両端部に該内部電極と電気的に接続するように外部電極用導電性ペーストを塗布して焼付け処理を施す外部電極形成工程を備えることを特徴とする前記[5]又は[6]の積層セラミックコンデンサの製造方法。[8]BaTiO3系化合物からなる主成分原料に、副成分原料として少なくともRe(ここで、Reは、Eu、Gd、Dy、Ho、Er、Yb、及びYから選ばれる1種以上)、Mn、B、およびLiと、更にV、Moのうち1種以上と、或いは更にCuやBa、Sr、Caを、酸化物やガラス、その他の化合物などの形態で含むセラミック原料を準備する工程と、該セラミック原料を用いてセラミックグリーンシートを形成するシート形成工程と、該セラミックグリーンシートにCuを主成分とする内部電極パターンを印刷する印刷工程と、該印刷工程を経たセラミックグリーンシートを積層して積層体を形成する積層工程と、該積層体を内部電極パターン毎に裁断してチップ状の積層体を得る裁断工程と、該裁断工程で得られたチップ状の積層体の両端部に該内部電極と電気的に接続するように外部電極用導電性ペーストを塗布する外部電極形成工程と、該外部電極形成工程で得られたチップ状の積層体を1030℃以下の温度で還元性雰囲気にて焼成する焼成工程を備えることを特徴とする上記[5]又は[6]の積層セラミックコンデンサの製造方法。
以下であれば特性上に大きな影響を与えないことを確認した。一方で、1.0mol%よりも多く含まれていると焼結性の低下が顕著になるために、SiO2の不純物含有量を1.0mol%以下にする必要がある。
、組成物を構成する成分の含有量等を前記の如く特定することで、組成物中に環境や人体に有害な鉛やビスマス等を含有しなくても、1080℃以下の低温焼結が可能で、Cuを主成分とする導電性に優れた金属との共焼結が可能であり、Cuを内部電極とすることで、高誘電率かつX7R特性(またはX5R特性)を満足する誘電特性を示すと共に、還元雰囲気下で焼成しても、絶縁抵抗が高く、さらに高温負荷などの寿命特性に優れた積層セラミックコンデンサを得ることができきることがわかる。
Claims (7)
- 複数の誘電体セラミック層と、該誘電体セラミック層間に対向して形成された内部電極を有する積層セラミックコンデンサにおいて、前記誘電体セラミック層が、BaTiO3からなる主成分と、Re、Mn、V、Mo、Cu、B、Li、Ca、Srからなる副成分とからなる誘電体磁器組成物で構成された焼結体であって、
前記誘電体磁器組成を、BaTiO3+aRe2O3+bMnO+cV2O5+dMoO3+eCuO+fB2O3+gLi2O+xSrO+yCaO((ただし、ReはEu、Gd、Dy、Ho、Er、Yb、及びYから選ばれる1種以上、a〜g、xおよびyはBaTiO3からなる主成分100molに対するmol数を示す。)で表記し、該誘電体磁気組成物に含まれる(Ba+Sr+Ca)/Tiのmol比をmとしたとき、
0.10≦a≦0.50
0.20≦b≦0.80
0≦c≦0.12
0≦d≦0.07
0.04≦c+d≦0.12
0≦e≦1.00
0.50≦f≦2.00
0.6≦(100(m−1)+2g)/2f≦1.3
0.5≦100(m−1)/2g≦5.1
0≦x≦1.5
0≦y≦1.5
であり、
前記内部電極は、CuまたはCu合金で構成されていることを特徴とする積層セラミックコンデンサ。 - 不純物として含まれるSiは、BaTiO3からなる主成分を100molとしたときにSiO2換算で1.0mol以下であることを特徴とする請求項1に記載の積層セラミックコンデンサ。
- 前記誘電体磁器組成を、(Ba1−v−wSrvCaw)TiO3+aRe2O3+bMnO+cV2O5+dMoO3+eCuO+fB2O3+gLi2O+xSrO+yCaOで表記したとき、
0≦x+v×100≦1.5
0≦y+w×100≦1.5
としたことを特徴とする請求項1〜2のいずれか1項に記載の積層セラミックコンデンサ。 - 焼結温度が1030℃以下で緻密化させることが可能であることを特徴とする請求項1〜3のいずれか1項に記載の積層セラミックコンデンサ。
- 前記積層セラミックコンデンサが、複数の誘電体セラミック層と、該誘電体セラミック層間に対向して形成され、交互に異なる端面へ引出されるように形成された内部電極と、前記誘電体セラミック層の両端面に形成され、前記内部電極のそれぞれに電気的に接続された外部電極とを有することを特徴とする請求項1に記載の積層セラミックコンデンサ。
- BaTiO3系化合物からなる主成分原料に、副成分原料として少なくともRe(ここで、Reは、Eu、Gd、Dy、Ho、Er、Yb、及びYから選ばれる1種以上)、Mn、B、およびLiと、更にV、Moのうち1種以上と、或いは、更にCuやBa、Sr、Caを、酸化物やガラス、その他の化合物などの形態で含むセラミック原料を準備する工程と、該セラミック原料を用いてセラミックグリーンシートを形成するシート形成工程と、該セラミックグリーンシートにCuを主成分とする内部電極パターンを印刷する印刷工程と、該印刷工程を経たセラミックグリーンシートを積層して積層体を形成する積層工程と、該積層体を内部電極パターン毎に裁断してチップ状の積層体を得る裁断工程と、該裁断工程で得られたチップ状の積層体を1030℃以下の温度で還元性雰囲気にて焼成して焼結体を得る焼成工程と、該焼結体の両端部に該内部電極と電気的に接続するように外部電極用導電性ペーストを塗布して焼付け処理を施す外部電極形成工程を備えることを特徴とする請求項1〜5のいずれか1項に記載の積層セラミックコンデンサの製造方法。
- BaTiO3系化合物からなる主成分原料に、副成分原料として少なくともRe(ここで、Reは、Eu、Gd、Dy、Ho、Er、Yb、及びYから選ばれる1種以上)、Mn、B、およびLiと、更にV、Moのうち1種以上と、或いは更にCuやBa、Sr、Caを、酸化物やガラス、その他の化合物などの形態で含むセラミック原料を準備する工程と、該セラミック原料を用いてセラミックグリーンシートを形成するシート形成工程と、該セラミックグリーンシートにCuを主成分とする内部電極パターンを印刷する印刷工程と、該印刷工程を経たセラミックグリーンシートを積層して積層体を形成する積層工程と、該積層体を内部電極パターン毎に裁断してチップ状の積層体を得る裁断工程と、該裁断工程で得られたチップ状の積層体の両端部に該内部電極と電気的に接続するように外部電極用導電性ペーストを塗布する外部電極形成工程と、該外部電極形成工程で得られたチップ状の積層体を1030℃以下の温度で還元性雰囲気にて焼成する焼成工程を備えることを特徴とする請求項1〜5のいずれか1項に記載の積層セラミックコンデンサの製造方法。
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