JPH0897527A - Conductive paste - Google Patents

Conductive paste

Info

Publication number
JPH0897527A
JPH0897527A JP23517394A JP23517394A JPH0897527A JP H0897527 A JPH0897527 A JP H0897527A JP 23517394 A JP23517394 A JP 23517394A JP 23517394 A JP23517394 A JP 23517394A JP H0897527 A JPH0897527 A JP H0897527A
Authority
JP
Japan
Prior art keywords
silver powder
conductive paste
flake
ceramic capacitor
present
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.)
Withdrawn
Application number
JP23517394A
Other languages
Japanese (ja)
Inventor
Masayuki Takada
昌之 高田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Materials Corp
Original Assignee
Mitsubishi Materials Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Materials Corp filed Critical Mitsubishi Materials Corp
Priority to JP23517394A priority Critical patent/JPH0897527A/en
Publication of JPH0897527A publication Critical patent/JPH0897527A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00Fixed capacitors; Processes of their manufacture
    • H01G4/002Details
    • H01G4/018Dielectrics
    • H01G4/06Solid dielectrics
    • H01G4/08Inorganic dielectrics
    • H01G4/12Ceramic dielectrics

Abstract

PURPOSE: To provide a conductive paste by which a terminal electrode having small sintering contraction at the time of sintering can be made, thereby providing a multilayer ceramic capacitor having excellent thermal shock resistance. CONSTITUTION: In a conductive paste containing a silver powder and an organic vehicle, the silver powder of not less than 40wt.% is a flake-like silver powder. Thus, the silver powder of not less than 40wt.% is made up of a flake-like silver powder, thereby greatly reducing the contraction on sintering of the obtained electrode.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は導電性ペーストに係り、
特に、焼成時の焼結収縮が少ない端子電極を形成するこ
とができ、これにより耐熱衝撃性に優れた積層セラミッ
クコンデンサを作製することができる導電性ペーストに
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive paste,
In particular, the present invention relates to a conductive paste capable of forming a terminal electrode with less sintering shrinkage during firing, thereby producing a laminated ceramic capacitor having excellent thermal shock resistance.

【0002】[0002]

【従来の技術】積層セラミックコンデンサの端子電極
は、従来、有機ビヒクルと、導電性金属粉としての銀粉
及び素体セラミックスとの接合を図るためのガラスフリ
ットを固形分として含む導電性ペーストを用いて形成さ
れている。具体的には、この導電性ペーストをディップ
法により素体セラミックスに塗布し、乾燥後焼成を行っ
て端子電極が形成されている。一般には、この端子電極
には、耐はんだ喰われ性の向上のために、更にめっき被
膜が形成される。このめっき被膜としては、耐熱性が良
好なニッケル被膜がバリア層として形成され、更にその
上にはんだ濡れ性向上のためにはんだめっき被膜が形成
されている。
2. Description of the Related Art Conventionally, a terminal electrode of a monolithic ceramic capacitor uses a conductive paste containing a glass frit as a solid content for bonding an organic vehicle to silver powder as a conductive metal powder and a base ceramic. Has been formed. Specifically, this conductive paste is applied to the elemental ceramics by a dipping method, dried and baked to form the terminal electrodes. Generally, a plating film is further formed on the terminal electrode in order to improve resistance to solder erosion. As this plating film, a nickel film having good heat resistance is formed as a barrier layer, and a solder plating film is further formed thereon for improving solder wettability.

【0003】なお、従来の導電性ペーストにおいて、銀
粉としては、球状の銀粉が用いられている。
In the conventional conductive paste, spherical silver powder is used as the silver powder.

【0004】[0004]

【発明が解決しようとする課題】従来の導電性ペースト
で形成された端子電極では焼成時の焼結収縮が大きいこ
とから、素体セラミックスに負荷される熱応力(ストレ
ス)が大きく、このことが積層セラミックコンデンサの
耐熱衝撃性劣化の要因となっていた。
Since the terminal electrode formed of the conventional conductive paste has a large sinter shrinkage during firing, the thermal stress (stress) applied to the elemental ceramics is large. It was a factor of deterioration of thermal shock resistance of the monolithic ceramic capacitor.

【0005】本発明は上記従来の問題点を解決し、焼成
時の端子電極の焼結収縮が少なく、耐熱衝撃性に優れた
積層セラミックコンデンサを作製することができる導電
性ペーストを提供することを目的とする。
The present invention solves the above-mentioned conventional problems and provides a conductive paste capable of producing a monolithic ceramic capacitor excellent in thermal shock resistance with less sintering shrinkage of a terminal electrode during firing. To aim.

【0006】[0006]

【課題を解決するための手段】請求項1の導電性ペース
トは、銀粉と有機ビヒクルとを含む導電性ペーストにお
いて、該銀粉の40重量%以上がフレーク状銀粉である
ことを特徴とする。
The conductive paste according to claim 1 is characterized in that, in the conductive paste containing silver powder and an organic vehicle, 40% by weight or more of the silver powder is flaky silver powder.

【0007】請求項2の導電性ペーストは、請求項1に
おいて、銀粉のうちの40〜85重量%がフレーク状銀
粉であり、残部が球状銀粉であることを特徴とする。
A conductive paste according to a second aspect of the present invention is characterized in that, in the first aspect, 40 to 85% by weight of the silver powder is flaky silver powder, and the balance is spherical silver powder.

【0008】請求項3の導電性ペーストは、請求項1又
は2において、積層セラミックコンデンサの端子電極形
成用導電性ペーストであることを特徴とする。
A third aspect of the present invention is the conductive paste according to the first or second aspect, which is a conductive paste for forming a terminal electrode of a laminated ceramic capacitor.

【0009】以下に本発明を詳細に説明する。The present invention will be described in detail below.

【0010】本発明の導電性ペーストにおいては、銀粉
の少なくとも一部をフレーク状銀粉とする。
In the conductive paste of the present invention, at least a part of the silver powder is flake silver powder.

【0011】本発明で用いるフレーク状銀としては、取
り扱い性及び電極の焼結収縮低減効果の面から、粒径
(偏平面方向の長さ)5〜10μmで厚さ1〜3μmの
ものが好ましい。
The flake silver used in the present invention preferably has a grain size of 5 to 10 μm and a thickness of 1 to 3 μm from the viewpoint of handleability and the effect of reducing the sintering shrinkage of the electrode. .

【0012】本発明において、用いる銀粉中のフレーク
状銀粉の割合が40重量%未満であると、本発明による
焼結収縮低減効果が十分に得られない。しかしながら、
フレーク状銀粉はその割合が多過ぎると得られる導電性
ペーストの流動性が低下し、取り扱い性、塗布作業性が
悪化するため、銀粉としては、フレーク状銀粉40〜8
5重量%と、残部球状銀粉との混合粉を用いるのが好ま
しい。なお球状銀粉としては平均粒径1〜3μmのもの
を用いるのが好ましい。
In the present invention, if the ratio of the flake silver powder in the silver powder used is less than 40% by weight, the effect of reducing the sintering shrinkage according to the present invention cannot be sufficiently obtained. However,
If the flake-shaped silver powder is too large in proportion, the fluidity of the conductive paste to be obtained is lowered, and the handling property and the coating workability are deteriorated. Therefore, the flake-shaped silver powder 40 to 8 is used as the silver powder.
It is preferable to use a mixed powder of 5% by weight and the balance spherical silver powder. The spherical silver powder preferably has an average particle size of 1 to 3 μm.

【0013】本発明の導電性ペーストは、このようなフ
レーク状銀粉を含む銀粉、好ましくはフレーク状銀粉と
球状銀粉との混合銀粉を用い、例えば下記配合にて、好
ましくは粘度200〜600ポアズの導電性ペーストと
することにより容易に調製することができる。
The conductive paste of the present invention uses silver powder containing such flake-shaped silver powder, preferably mixed silver powder of flake-shaped silver powder and spherical silver powder, for example, in the following formulation, preferably with a viscosity of 200 to 600 poise. It can be easily prepared by using a conductive paste.

【0014】導電性ペースト配合(重量%) 銀粉:60〜80 ガラスフリット:1〜3 有機ビヒクル:39〜17 なお、有機ビヒクルとは、バインダーとしてエチルセル
ロース等と粘度調整剤としてブチルカルビトール等を含
むものである。
Blending of conductive paste (wt%) Silver powder: 60-80 Glass frit: 1-3 Organic vehicle: 39-17 The organic vehicle includes ethyl cellulose as a binder and butyl carbitol as a viscosity modifier. It is a waste.

【0015】このような本発明の導電性ペーストによれ
ば、常法に従ってディップ法により素体セラミックスに
塗布した後乾燥して焼成することにより、容易に積層セ
ラミックコンデンサに端子電極を形成することができ、
焼結時の端子電極の収縮を減少させて素体セラミックス
へのストレスを低減することにより耐熱衝撃性に優れた
積層セラミックコンデンサを製造することができる。
According to such a conductive paste of the present invention, a terminal electrode can be easily formed on a monolithic ceramic capacitor by applying it to a body ceramics by a dipping method according to a conventional method, then drying and firing. You can
A multilayer ceramic capacitor having excellent thermal shock resistance can be manufactured by reducing the contraction of the terminal electrode during sintering and reducing the stress on the elemental ceramics.

【0016】[0016]

【作用】銀粉の40重量%以上をフレーク状銀粉とする
ことにより、得られる電極の焼結収縮を大幅に低減する
ことができる。
By using 40% by weight or more of the silver powder as flaky silver powder, the sintering shrinkage of the obtained electrode can be significantly reduced.

【0017】銀粉としてフレーク状銀粉のみを用いる
と、得られる導電性ペーストの流動性が損なわれるが、
銀粉の40〜85重量%をフレーク状銀粉とし、残部を
球状銀粉とすることにより、流動性が良好で取り扱い
性、塗布作業性に優れた導電性ペーストとなる。
When only flake-shaped silver powder is used as the silver powder, the fluidity of the resulting conductive paste is impaired,
By using 40 to 85% by weight of the silver powder as flake-shaped silver powder and the rest as spherical silver powder, a conductive paste having good fluidity, handleability and coating workability can be obtained.

【0018】本発明の導電性ペーストは、特に積層セラ
ミックコンデンサの端子電極形成用導電性ペーストとし
て、工業的に極めて有用である。
The conductive paste of the present invention is industrially very useful particularly as a conductive paste for forming terminal electrodes of a laminated ceramic capacitor.

【0019】[0019]

【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。
EXAMPLES The present invention will be described more specifically with reference to Examples and Comparative Examples below.

【0020】実施例1 下記粒径のフレーク状銀粉と球状銀粉とを表1に示す割
合で混合した混合銀粉を用い、下記配合にて導電性ペー
ストを調製した。なお、ペーストの粘度は280±30
ポアズになるように調整した。
Example 1 A conductive paste was prepared with the following composition by using a mixed silver powder in which flaky silver powder having the following particle diameter and spherical silver powder were mixed at the ratio shown in Table 1. The viscosity of the paste is 280 ± 30
Adjusted to be poise.

【0021】フレーク状銀粉 平均粒径:5μm 平均厚さ:2μm球状銀粉 平均粒径:2μm導電性ペースト配合(重量%) 混合銀:74 有機ビヒクル:23 ガラスフリット:3 得られた導電性ペーストを、各々、4.5mm×3.2
mm、厚さ1.6mmのチタン酸バリウムを主成分とす
る誘電体を用いた積層セラミックコンデンサ素体にディ
ップ法により塗布し、20℃/分の速さで昇温乾燥し、
更に680〜720℃で10分間焼成することにより端
子電極を形成した。その後、更に、電解めっき法により
バリア層としてニッケル層と、はんだ濡れ性向上のため
にはんだめっき層を形成してコンデンサを作製した。
Flake-shaped silver powder average particle diameter: 5 μm Average thickness: 2 μm Spherical silver powder average particle diameter: 2 μm Mixed with a conductive paste (wt%) Mixed silver: 74 Organic vehicle: 23 Glass frit: 3 The obtained conductive paste was used. , 4.5 mm x 3.2, respectively
mm, thickness 1.6 mm, applied to a monolithic ceramic capacitor body using a dielectric material containing barium titanate as a main component by a dip method, and dried by heating at a rate of 20 ° C./min.
Furthermore, the terminal electrode was formed by baking at 680-720 degreeC for 10 minutes. Thereafter, a nickel layer as a barrier layer and a solder plating layer for improving solder wettability were further formed by electrolytic plating to prepare a capacitor.

【0022】作製したコンデンサについて、次の方法に
より熱衝撃試験を行った。即ち、作製したコンデンサ1
00個を、ロジン系フラックスに浸漬後、350±5℃
に温度調節したはんだ槽へピンセットで一個づつ3秒間
浸漬した後、引き上げ、外観を観察して、100個中の
クラックの発生数を調べ、結果を表1に示した。
A thermal shock test was performed on the manufactured capacitor by the following method. That is, the manufactured capacitor 1
After soaking 00 pieces in rosin flux, 350 ± 5 ℃
Each piece was dipped into the solder bath whose temperature was adjusted to 3 by using tweezers for 3 seconds, then pulled up, the appearance was observed, and the number of cracks in 100 pieces was checked. The results are shown in Table 1.

【0023】[0023]

【表1】 [Table 1]

【0024】表1より、本発明の導電性ペーストによれ
ば、耐熱衝撃性に優れたコンデンサを得ることができる
ことが明らかである。
From Table 1, it is clear that the conductive paste of the present invention can provide a capacitor having excellent thermal shock resistance.

【0025】[0025]

【発明の効果】以上詳述した通り、本発明の導電性ペー
ストによれば、形成する電極の焼成時の焼結収縮を少な
くすることができる。このため、端子電極の焼結収縮が
少ないことから、耐熱衝撃性に優れた積層セラミックコ
ンデンサを作製することが可能とされる。
As described above in detail, according to the conductive paste of the present invention, it is possible to reduce the sintering shrinkage of the formed electrode during firing. Therefore, the sintering shrinkage of the terminal electrode is small, so that it is possible to manufacture a monolithic ceramic capacitor having excellent thermal shock resistance.

【0026】請求項2の導電性ペーストによれば、流動
性が良好で、取り扱い性、塗布作業性にも優れた導電性
ペーストが提供される。
According to the conductive paste of the second aspect, a conductive paste having good fluidity and excellent handleability and coating workability is provided.

【0027】このような本発明の導電性ペーストは、積
層セラミックコンデンサの端子電極形成用導電性ペース
トとして工業的に極めて有用である。
Such a conductive paste of the present invention is industrially very useful as a conductive paste for forming a terminal electrode of a laminated ceramic capacitor.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 銀粉と有機ビヒクルとを含む導電性ペー
ストにおいて、該銀粉の40重量%以上がフレーク状銀
粉であることを特徴とする導電性ペースト。
1. A conductive paste containing silver powder and an organic vehicle, wherein 40% by weight or more of the silver powder is flaky silver powder.
【請求項2】 請求項1において、銀粉のうちの40〜
85重量%がフレーク状銀粉であり、残部が球状銀粉で
あることを特徴とする導電性ペースト。
2. The silver powder according to claim 1, wherein
85% by weight is flake-shaped silver powder, and the rest is spherical silver powder, a conductive paste.
【請求項3】 請求項1又は2において、積層セラミッ
クコンデンサの端子電極形成用導電性ペーストであるこ
とを特徴とする導電性ペースト。
3. The conductive paste according to claim 1, which is a conductive paste for forming a terminal electrode of a laminated ceramic capacitor.
JP23517394A 1994-09-29 1994-09-29 Conductive paste Withdrawn JPH0897527A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23517394A JPH0897527A (en) 1994-09-29 1994-09-29 Conductive paste

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23517394A JPH0897527A (en) 1994-09-29 1994-09-29 Conductive paste

Publications (1)

Publication Number Publication Date
JPH0897527A true JPH0897527A (en) 1996-04-12

Family

ID=16982153

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23517394A Withdrawn JPH0897527A (en) 1994-09-29 1994-09-29 Conductive paste

Country Status (1)

Country Link
JP (1) JPH0897527A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004362950A (en) * 2003-06-05 2004-12-24 Noritake Co Ltd Conductive paste mainly composed of silver powder, and its manufacturing method
JP2005268204A (en) * 2004-02-19 2005-09-29 Murata Mfg Co Ltd Conductive paste and ceramic electronic component
CN102842353A (en) * 2012-08-14 2012-12-26 廖晓峰 Electrocondution slurry for chip component termination electrode
CN103440899A (en) * 2013-08-15 2013-12-11 广东风华高新科技股份有限公司 Silver electrode paste
JP2014182891A (en) * 2013-03-18 2014-09-29 Fdk Corp Conductive paste, laminated chip inductor, and ceramic electronic component
JP2015111576A (en) * 2014-12-24 2015-06-18 ナミックス株式会社 Conductive paste for external electrode, and multilayered ceramic electronic part with external electrode formed by conductive paste
JP2016076444A (en) * 2014-10-08 2016-05-12 化研テック株式会社 Conductive paste and electromagnetic wave shielding member

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004362950A (en) * 2003-06-05 2004-12-24 Noritake Co Ltd Conductive paste mainly composed of silver powder, and its manufacturing method
JP2005268204A (en) * 2004-02-19 2005-09-29 Murata Mfg Co Ltd Conductive paste and ceramic electronic component
CN102842353A (en) * 2012-08-14 2012-12-26 廖晓峰 Electrocondution slurry for chip component termination electrode
JP2014182891A (en) * 2013-03-18 2014-09-29 Fdk Corp Conductive paste, laminated chip inductor, and ceramic electronic component
CN103440899A (en) * 2013-08-15 2013-12-11 广东风华高新科技股份有限公司 Silver electrode paste
JP2016076444A (en) * 2014-10-08 2016-05-12 化研テック株式会社 Conductive paste and electromagnetic wave shielding member
JP2015111576A (en) * 2014-12-24 2015-06-18 ナミックス株式会社 Conductive paste for external electrode, and multilayered ceramic electronic part with external electrode formed by conductive paste

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Effective date: 20020115