JPH05258608A - Conductive paste - Google Patents
Conductive pasteInfo
- Publication number
- JPH05258608A JPH05258608A JP3892392A JP3892392A JPH05258608A JP H05258608 A JPH05258608 A JP H05258608A JP 3892392 A JP3892392 A JP 3892392A JP 3892392 A JP3892392 A JP 3892392A JP H05258608 A JPH05258608 A JP H05258608A
- Authority
- JP
- Japan
- Prior art keywords
- conductive paste
- metal powder
- sintering
- delamination
- amount
- 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- Withdrawn
Links
Landscapes
- Parts Printed On Printed Circuit Boards (AREA)
- Paints Or Removers (AREA)
- Ceramic Capacitors (AREA)
- Conductive Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は導電性ペーストに関し、
特に積層セラミックコンデンサに用いられる内部電極用
の導電性の金属粉末を含有する金属ペーストに関する。The present invention relates to a conductive paste,
In particular, the present invention relates to a metal paste containing a conductive metal powder for internal electrodes used in a laminated ceramic capacitor.
【０００２】[0002]
【従来の技術】一般に積層セラミックコンデンサの内部
電極に用いられる導電性の金属ペーストは、銀，パラジ
ウムなどの金属粉末と有機バインダ及び溶剤からなるビ
ヒクルを混合し、これらを三本ロールミル等により混練
して製造される。2. Description of the Related Art Generally, a conductive metal paste used for an internal electrode of a monolithic ceramic capacitor is prepared by mixing a metal powder such as silver or palladium, a vehicle consisting of an organic binder and a solvent, and kneading them with a three roll mill. Manufactured.
【０００３】積層セラミックコンデンサは、セラミック
混合粉末を有機バインダと混合し、キャスティング法等
によりシート状に加工した後、上述した導電性の金属ペ
ーストを用いて内部電極を印刷，積層，圧着，切断焼成
し、外部電極を形成し製造される。In a monolithic ceramic capacitor, a ceramic mixed powder is mixed with an organic binder, processed into a sheet by a casting method or the like, and then the internal electrodes are printed, laminated, pressure-bonded and cut and fired using the above-mentioned conductive metal paste. Then, an external electrode is formed and manufactured.
【０００４】[0004]
【発明が解決しようとする課題】上述した積層セラミッ
クコンデンサの製造工程のうち、焼成工程時にセラミッ
ク粉末は互いに反応して焼成収縮しセラミック部の緻密
化がなされる。In the manufacturing process of the above-mentioned laminated ceramic capacitor, the ceramic powders react with each other during the firing process to cause firing shrinkage to densify the ceramic portion.
【０００５】同時に内部電極として塗布した導電性ペー
スト中の金属粉末も焼成収縮し、内部電極が形成され
る。セラミックと金属粉末の焼成収縮量には差があるた
めにセラミックと内部電極間のハクリが生じるという問
題があった。At the same time, the metal powder in the conductive paste applied as the internal electrodes is also shrunk and contracted to form the internal electrodes. Since there is a difference in firing shrinkage amount between the ceramic and the metal powder, there is a problem in that the ceramic and the internal electrode are peeled off.
【０００６】本発明の目的は、積層セラミックコンデン
サの製造において、金属粉末の焼結収縮量をセラミクス
の焼結収縮量にあわせることができ、積層セラミックコ
ンデンサに生ずるデラミネーション，クラックの発生を
おさえることができる導電性ペーストを提供することに
ある。An object of the present invention is to suppress the occurrence of delamination and cracks that occur in a laminated ceramic capacitor, by making it possible to match the amount of sintering shrinkage of metal powder with the amount of sintering shrinkage of ceramics in the manufacture of a laminated ceramic capacitor. It is to provide a conductive paste capable of
【０００７】[0007]
【課題を解決するための手段】本発明の導電性ペースト
は銀を含む金属粉末と有機バインダーと溶剤を混練して
なる導電性ペーストにおいて、ジルコニウムアルコラー
トを含有することを特徴として構成される。また、ジル
コニウムアルコラート中のジルコニア量が、導電性ペー
スト中の金属粉末に対して０．１ｗｔ％〜６ｗｔ％の範
囲で含有されることを特徴としている。The conductive paste of the present invention is a conductive paste obtained by kneading a metal powder containing silver, an organic binder and a solvent, and is characterized by containing zirconium alcoholate. Further, it is characterized in that the amount of zirconia in the zirconium alcoholate is contained in the range of 0.1 wt% to 6 wt% with respect to the metal powder in the conductive paste.
【０００８】[0008]
【実施例】次に本発明について図面を参照して説明す
る。まず、表１に本発明の実施例（組成Ａ〜Ｅ）及び従
来例（組成Ｆ）の導電性ペーストの構成を示す。The present invention will be described below with reference to the drawings. First, Table 1 shows the configurations of the conductive pastes of the examples (compositions A to E) of the present invention and the conventional example (composition F).
【０００９】[0009]
【表１】 [Table 1]
【００１０】なお、表で示したパラジウム粉末は粒径
０．１〜０．３μｍ、銀粉は粒径０．２〜０．５μｍの
ものを用いた。一方ジルコニウムアルコラートはジルコ
ニウム（４価）アセチルアセトネート（分子量４８７，
６５，ジルコニア（ＺｒＯ2 ）含有量２５．３ｗｔ％）
を用いた。また有機ビヒクルはエチルセルロース樹脂と
テレピネオール等の溶剤を混合したものを用いた。The palladium powder shown in the table had a particle size of 0.1 to 0.3 μm, and the silver powder had a particle size of 0.2 to 0.5 μm. On the other hand, zirconium alcoholate is zirconium (tetravalent) acetylacetonate (molecular weight 487,
65, zirconia (ZrO 2 ) content 25.3 wt%)
Was used. The organic vehicle used was a mixture of ethyl cellulose resin and a solvent such as terpineol.
【００１１】表１に示す分量のパラジウム粉と銀粉を予
め混合し、混合粉とした。有機ビヒクルにその混合粉末
とジルコニウムアルコラートを混合し、３本ロールミル
にて混合し組成Ｉ〜Ｖの導電性ペーストを得た。The amounts of palladium powder and silver powder shown in Table 1 were mixed in advance to obtain a mixed powder. The mixed powder and zirconium alcoholate were mixed with an organic vehicle and mixed with a three-roll mill to obtain conductive pastes having compositions IV.
【００１２】次に厚さ１０μｍの鉛系の誘電体セラミッ
クのグリーンシート上に所定のパターンで各々の導電体
ペーストを印刷し１４０層積層し圧着・切断した未焼成
の積層セラミックコンデンサとした。未焼成の積層セラ
ミックコンデンサを３００〜４００℃でバインダを飛ば
した後に１００℃／Ｈの速度で昇温し、１０００℃で２
時間保持した後、１００℃／Ｈｒで降温し積層セラミッ
クコンデンサ素子を得た。Next, an unfired monolithic ceramic capacitor was obtained by printing each conductor paste in a predetermined pattern on a green sheet of a lead-based dielectric ceramic having a thickness of 10 μm, laminating 140 layers, crimping and cutting. The unfired monolithic ceramic capacitor is heated at a rate of 100 ° C./H after the binder is blown at 300 to 400 ° C.
After holding for a time, the temperature was lowered at 100 ° C./Hr to obtain a monolithic ceramic capacitor element.
【００１３】得られた積層セラミックコンデンサ素子に
ついて１０，０００個中のデラミネーション，クラック
の発生を調べた。その結果を表２に示す。With respect to the obtained monolithic ceramic capacitor element, the occurrence of delamination and crack in 10,000 pieces was examined. The results are shown in Table 2.
【００１４】[0014]
【表２】 [Table 2]
【００１５】表２に示すようにジルコニウムアルコラー
トを、ジルコニア含有量が導電性ペースト中の金属粉末
に対して０．１ｗｔ％〜６ｗｔ％の範囲で含有される導
電性ペーストを用いることによって効果的にデラミネー
ションをおさえることができる。図１に静電容量，誘電
正接のジルコニウムアルコラートによる変化を示す。ジ
ルコニウムアルコラート中のジルコニアが金属粉末量の
６ｗｔ％をこえると内部電極の焼結がすすまず静電容
量，誘電正接特性に悪化が見られる。As shown in Table 2, zirconium alcoholate is effectively used by using a conductive paste containing zirconia in the range of 0.1 wt% to 6 wt% with respect to the metal powder in the conductive paste. Delamination can be suppressed. Figure 1 shows the changes in capacitance and dielectric loss tangent due to zirconium alcoholate. When the amount of zirconia in the zirconium alcoholate exceeds 6 wt% of the metal powder amount, the sintering of the internal electrode is rather slow and the electrostatic capacitance and dielectric loss tangent characteristics are deteriorated.
【００１６】[0016]
【発明の効果】以上説明したように本発明はジルコニウ
ムアルコラートを含有した導電性ペーストを用いること
によってデラミネーション、クラック等の構造欠陥を防
ぐことができる。As described above, the present invention can prevent structural defects such as delamination and cracks by using a conductive paste containing zirconium alcoholate.
【００１７】ジルコニウムアルコラートを含有する導電
性ペーストを乾燥，焼成の工程時にジルコニウムアルコ
ラートが分解し、微細なジルコニアとなって金属粉末表
面に付着する。このジルコニアは金属の相互拡散を防げ
るため焼結収縮をおさえる。During the steps of drying and firing the zirconium alcoholate-containing conductive paste, the zirconium alcoholate is decomposed to form fine zirconia and adhere to the surface of the metal powder. This zirconia suppresses sintering shrinkage because it prevents mutual diffusion of metals.
【００１８】一般的にセラミクスの焼結収縮に比べて金
属粉末の焼結収縮量が大きく、この収縮量の差がデラミ
ネーション，クラックの一因となっているが、ジルコニ
ウムアルコラートを適量添加することで金属粉末の焼結
収縮量をセラミクスの焼結収縮量にあわせることがで
き、デラミネーション，クラックの発生をおさえるとい
う効果を有する。Generally, the amount of sintering shrinkage of the metal powder is larger than that of ceramics, and the difference in the amount of shrinkage is one of the causes of delamination and cracks. However, an appropriate amount of zirconium alcoholate should be added. Thus, the amount of sintering shrinkage of the metal powder can be matched with the amount of sintering shrinkage of the ceramics, which has the effect of suppressing the occurrence of delamination and cracks.
【図１】本発明の実施例の導電性ペースト中の金属粉末
に対するジルコニア量と電気特性の関係を示す図であ
る。FIG. 1 is a diagram showing the relationship between the amount of zirconia and the electrical characteristics of a metal powder in a conductive paste according to an example of the present invention.
ａ 静電容量変化曲線 ｂ 誘電正接変化曲線 a Capacitance change curve b Dielectric loss tangent change curve
Claims (2)
剤を混練してなる導電性ペーストにおいて、ジルコニウ
ムアルコラートを含有することを特徴とする導電性ペー
スト。1. A conductive paste obtained by kneading a metal powder containing silver, an organic binder and a solvent, wherein the conductive paste contains zirconium alcoholate.
ア量が、導電性ペースト中の金属粉末に対して０．１ｗ
ｔ％〜６ｗｔ％の範囲で含有されることを特等とする請
求項１に記載の導電性ペースト。2. The amount of zirconia in zirconium alcoholate is 0.1 w relative to the metal powder in the conductive paste.
The conductive paste according to claim 1, wherein the conductive paste is contained in a range of t% to 6 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3892392A JPH05258608A (en) | 1992-02-26 | 1992-02-26 | Conductive paste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3892392A JPH05258608A (en) | 1992-02-26 | 1992-02-26 | Conductive paste |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05258608A true JPH05258608A (en) | 1993-10-08 |
Family
ID=12538746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3892392A Withdrawn JPH05258608A (en) | 1992-02-26 | 1992-02-26 | Conductive paste |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05258608A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2285987A (en) * | 1994-01-10 | 1995-08-02 | Murata Manufacturing Co | Conductive paste for ceramic capacitors |
-
1992
- 1992-02-26 JP JP3892392A patent/JPH05258608A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2285987A (en) * | 1994-01-10 | 1995-08-02 | Murata Manufacturing Co | Conductive paste for ceramic capacitors |
| GB2285987B (en) * | 1994-01-10 | 1997-08-06 | Murata Manufacturing Co | Conductive paste and its usage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990518 |