JPH0358523B2 - - Google Patents
Info
- Publication number
- JPH0358523B2 JPH0358523B2 JP29078285A JP29078285A JPH0358523B2 JP H0358523 B2 JPH0358523 B2 JP H0358523B2 JP 29078285 A JP29078285 A JP 29078285A JP 29078285 A JP29078285 A JP 29078285A JP H0358523 B2 JPH0358523 B2 JP H0358523B2
- Authority
- JP
- Japan
- Prior art keywords
- ceramic sheet
- ceramic
- internal electrode
- electrode paste
- powder
- 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.)
- Expired
Links
- 239000000919 ceramic Substances 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 15
- 239000003985 ceramic capacitor Substances 0.000 claims description 11
- 239000002003 electrode paste Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 229910000510 noble metal Inorganic materials 0.000 claims description 4
- 239000004014 plasticizer Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims description 2
- 238000010304 firing Methods 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000007606 doctor blade method Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 1
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229940116411 terpineol Drugs 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Ceramic Capacitors (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Description
〔発明の利用分野〕
本発明は積層セラミツクコンデンサの製造方法
に関し、特にセラミツクシートとしてPdを含む
ペロブスカイト型結晶構造を有する複酸化物素材
を用いたセラミツクコンデンサの製造方法に関す
るものである。なおペロブスカイト型結晶構造と
は一般式ABO3であらわされ、ＡとしてＫ、Ca、
Ba、Sr、Pbなどが用いられ、ＢとしてはTi、
Zr、Mn、Nb、Zn、Sb、Ta、Feの１種又は２種
以上の組合せが用いられる。
〔従来の技術〕
従来の上記のような構成の積層セラミツクコン
デンサは次のようにして作られている。即ち、先
ず、Pbを含むプロブスカイト結晶構造を有する
誘導体の素材をドクターブレイド法であらかじめ
所定の厚みに成形してセラミツクシートを形成
し、このシート上に、Agを50〜100％、Pdを50
〜０％の割合の貴金属粉末に有機ビヒクル（調合
剤、可塑剤、溶剤等）を加え３本ロール等混練し
て得られた内部電極ペーストを所定の形状に印刷
する。次に、それ等を複数枚打抜き、積層し、熱
圧着する。そして最後に、切断し、脱心、焼成し
てコンデツサが出来上がる。
〔発明が解決しようとする問題点〕
ところが前記のようにセラミツクシートがPb
を含むプロブスカイト結晶構造を有する誘電体を
素材となつているため、前記の最後の焼成工程を
一般的な方法で行うと焼成時にPbが蒸発してコ
ンデンサのチツプの表面と内部とで若干組成が変
化し、クラツクが生じて絶縁抵抗が劣化し、生産
性の歩留りや信頼性に欠けるので、実際にはセラ
ミツクシートをPbO粉末に埋設し、PbOの粉末に
よりセラミツクシートの周知の蒸気圧を高め、セ
ラミツクシートからのPbの蒸発を抑制する方法
を採つている。
しかし、この方法は埋設粉を用いるために焼成
処理後、セラミツクシートに付着した埋設粉を取
除く作業が必要となり、作業性、生産性が悪いと
いう問題点があつた。
本発明は生産性、作業性の優れた方法で、Pb
の発生を防止し、特性の優れたセラミツクコンデ
ンサを提供するものである。
〔問題点を解決するための手段〕
本発明のコンデンサの製造方法は、一般式
ABO3であらわされるペロブスカイト型の結晶構
造を有し而して前記Ａの少なくとも一部がPbで
ある複酸化物素材を以つてセラミツクシートを形
成し、貴金属粉末及び結合可塑材を用いて内部電
極ペーストを形成し、前記セラミツクシートに前
記内部電極ペーストを塗付し焼付けした素片を複
数枚積層してセラミツクコンデンサを製造する方
法において、前記内部電極ペーストを形成する工
程においてPbO粉末を前記貴金属粉末に対して
0.01〜５％添加する処理を付加したことを特徴と
するものである。
〔実施例〕
以下本発明の実施例を説明する。
Pb〔（Nb1/2Fe1/2）0.67・（Ｗ1/3、Fe2/3）
0.33〕O3組成を有する複合ペロブスカイト結晶構
造の誘電体の粉末をドクターブレイド法で40μｍ
厚のセラミツクシートを形成する。一方PbOを
0.01〜1.5％、Pdを18.5％、残余Agを混合した無
機物に、結合剤（エテルセルロース）と、可塑剤
（PBPG）と、溶剤（α、テレピネオール、ケロ
シン）と、ステアリン酸とからなる有機ビヒクル
を加え、３本ロールで混練して内部電極ペースト
を形成する。そしてこの内部電極ペーストを前述
のセラミツクシートへ5μｍの厚さで所定の形状
に印刷する。そのあと所定の形状に打抜いて素片
を形成し、これを複数枚積層し、熱圧着し、所定
の形（たとえば10×12mm2）に切断して生チツプ
を得る。この生チツプを所定の条件で脱バインダ
ー後低温焼成（910℃）してセラミツクコンデン
サが作成される。
上記のようにして得たセラミツクコンデンサの
特性評価を行つたところ次の表に示すような結果
が得られた。但し寿命試験は50ケの試料を85℃で
500Vを印加して500時間経過しときのデータであ
る。
[Field of Application of the Invention] The present invention relates to a method for manufacturing a multilayer ceramic capacitor, and more particularly to a method for manufacturing a ceramic capacitor using a double oxide material having a perovskite crystal structure containing Pd as a ceramic sheet. The perovskite crystal structure is represented by the general formula ABO 3 , where A is K, Ca,
Ba, Sr, Pb, etc. are used, and B is Ti,
One or a combination of two or more of Zr, Mn, Nb, Zn, Sb, Ta, and Fe may be used. [Prior Art] A conventional multilayer ceramic capacitor having the above structure is manufactured as follows. That is, first, a ceramic sheet is formed by forming a derivative material containing Pb with a probskite crystal structure to a predetermined thickness using a doctor blade method, and on this sheet, 50 to 100% of Ag and 50% of Pd are applied.
The internal electrode paste obtained by adding an organic vehicle (preparative agent, plasticizer, solvent, etc.) to precious metal powder at a ratio of ~0% and kneading with three rolls or the like is printed in a predetermined shape. Next, a plurality of them are punched out, laminated, and thermocompressed. Finally, the condenser is completed by cutting, decentering, and firing. [Problem to be solved by the invention] However, as mentioned above, the ceramic sheet is
Since the material is a dielectric material with a provskite crystal structure containing As a result, the ceramic sheet is buried in PbO powder, and the PbO powder increases the well-known vapor pressure of the ceramic sheet. , a method is used to suppress the evaporation of Pb from ceramic sheets. However, since this method uses embedding powder, it is necessary to remove the embedding powder adhering to the ceramic sheet after the firing process, which has the problem of poor workability and productivity. The present invention is a method with excellent productivity and workability.
The present invention provides a ceramic capacitor with excellent characteristics. [Means for solving the problem] The method for manufacturing a capacitor of the present invention is based on the general formula
A ceramic sheet is formed using a double oxide material having a perovskite crystal structure represented by ABO 3 and at least a part of the above A is Pb, and an internal electrode is formed using a noble metal powder and a bonding plasticizer. In a method of manufacturing a ceramic capacitor by forming a paste and laminating a plurality of pieces obtained by coating and baking the internal electrode paste on the ceramic sheet, in the step of forming the internal electrode paste, the PbO powder is mixed with the noble metal powder. against
It is characterized by the additional treatment of adding 0.01 to 5%. [Example] Examples of the present invention will be described below. Pb [(Nb1/2Fe1/2)0.67・(W1/3, Fe2/3)
0.33〕 Dielectric powder with a composite perovskite crystal structure with O 3 composition was 40 μm thick using a doctor blade method.
Forms a thick ceramic sheet. On the other hand, PbO
An organic vehicle consisting of an inorganic mixture of 0.01 to 1.5% Pd, 18.5% Pd, and residual Ag, a binder (ether cellulose), a plasticizer (PBPG), a solvent (α, terpineol, kerosene), and stearic acid. and knead with three rolls to form an internal electrode paste. This internal electrode paste is then printed in a predetermined shape onto the aforementioned ceramic sheet to a thickness of 5 μm. Thereafter, a plurality of pieces are punched out into a predetermined shape, a plurality of pieces are stacked, thermocompression bonded, and cut into a predetermined shape (for example, 10×12 mm 2 ) to obtain green chips. A ceramic capacitor is produced by removing the binder from this green chip and firing it at a low temperature (910°C) under predetermined conditions. When the characteristics of the ceramic capacitor obtained as described above were evaluated, the results shown in the following table were obtained. However, the life test was conducted using 50 samples at 85℃.
This is the data after 500 hours had passed after applying 500V.
以上の様に本発明は内部電極ペースにPbO粉末
を含有させて内部電極ペーストからもPbが蒸発
する様にしたのでセラミツクシートからのPbの
蒸発を抑制でき、これによりセラミツクシートの
クラツクの発生を防止出来、且つ特性の優れた積
層セラミツクコンデンサを提供出来る。
さらに、コンデンサを生産するのにPbO粉末を
加えるだけでセラミツクシートから付着した埋設
粉を除去するという従来不可欠の工程を省略でき
るので、生産性の優れた積層セラミツクコンデツ
サが得られる。
As described above, in the present invention, the internal electrode paste contains PbO powder so that Pb evaporates from the internal electrode paste, so the evaporation of Pb from the ceramic sheet can be suppressed, and thereby the occurrence of cracks in the ceramic sheet can be suppressed. It is possible to provide a multilayer ceramic capacitor that can prevent the above problems and has excellent characteristics. Furthermore, by simply adding PbO powder to produce capacitors, it is possible to omit the conventionally indispensable process of removing embedded powder adhering to ceramic sheets, resulting in a laminated ceramic capacitor with excellent productivity.
Claims (1)
型の結晶構造を有し而して前記Ａの少なくとも一
部がPbである複酸化物素材を以つてセラミツク
シートを形成し、貴金属粉末及び結合可塑材を用
いて内部電極ペーストを形成し、前記セラミツク
シートに前記内部電極ペーストを塗付し焼付けし
た素片を複数枚積層してセラミツクコンデンサを
製造する方法において、前記内部電極ペーストを
形成する工程がPbO粉末を前記貴金属粉末に対し
て0.01〜５％添加する処理を付加したことを特徴
とする積層セラミツクコンデンサの製造方法。1 A ceramic sheet is formed using a double oxide material having a perovskite crystal structure represented by the general formula ABO 3 and in which at least a part of the above A is Pb, and a ceramic sheet is formed using a noble metal powder and a bonding plasticizer. In the method of manufacturing a ceramic capacitor by laminating a plurality of pieces obtained by coating and baking the internal electrode paste on the ceramic sheet, the step of forming the internal electrode paste involves adding PbO powder to the ceramic sheet. A method for manufacturing a multilayer ceramic capacitor, comprising adding 0.01 to 5% to the noble metal powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29078285A JPS62150808A (en) | 1985-12-25 | 1985-12-25 | Manufacture of laminated ceramic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29078285A JPS62150808A (en) | 1985-12-25 | 1985-12-25 | Manufacture of laminated ceramic capacitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62150808A JPS62150808A (en) | 1987-07-04 |
| JPH0358523B2 true JPH0358523B2 (en) | 1991-09-05 |
Family
ID=17760439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29078285A Granted JPS62150808A (en) | 1985-12-25 | 1985-12-25 | Manufacture of laminated ceramic capacitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62150808A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0294414A (en) * | 1988-09-30 | 1990-04-05 | Toshiba Corp | Manufacture of laminated ceramic capacitor |
| JPH0294507A (en) * | 1988-09-30 | 1990-04-05 | Toshiba Corp | Ferroelectric thin-film and manufacture thereof |
-
1985
- 1985-12-25 JP JP29078285A patent/JPS62150808A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62150808A (en) | 1987-07-04 |
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