JPH0766894B2 - Monolithic ceramic capacitors - Google Patents
Monolithic ceramic capacitorsInfo
- Publication number
- JPH0766894B2 JPH0766894B2 JP2069494A JP6949490A JPH0766894B2 JP H0766894 B2 JPH0766894 B2 JP H0766894B2 JP 2069494 A JP2069494 A JP 2069494A JP 6949490 A JP6949490 A JP 6949490A JP H0766894 B2 JPH0766894 B2 JP H0766894B2
- Authority
- JP
- Japan
- Prior art keywords
- ceramic capacitor
- monolithic ceramic
- thermosetting resin
- metal powder
- external electrode
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は積層セラミックコンデンサに係り、特に、安価
でしかも信頼性の高い積層セラミックコンデンサに関す
る。The present invention relates to a monolithic ceramic capacitor, and more particularly to an inexpensive and highly reliable monolithic ceramic capacitor.
［従来の技術］ 積層セラミックコンデンサは、セラミック誘電体と、そ
の内部に設けられた内部電極及びこの内部電極に導通す
る外部電極とで主に構成されている。従来、この積層セ
ラミックコンデンサの外部電極は、貴金属粉末とガラス
フリットとを混合したものを有機ビヒクルに混練し、こ
れをセラミック誘電体に塗布した後、600〜800℃程度の
温度で焼成して製造されている。[Prior Art] A monolithic ceramic capacitor is mainly composed of a ceramic dielectric, an internal electrode provided inside the ceramic dielectric, and an external electrode electrically connected to the internal electrode. Conventionally, the external electrodes of this monolithic ceramic capacitor are manufactured by kneading a mixture of precious metal powder and glass frit into an organic vehicle, applying this to a ceramic dielectric, and then firing it at a temperature of about 600 to 800 ° C. Has been done.
［発明が解決しようとする課題］ 外部電極がこのようにして製造された従来の積層セラミ
ックコンデンサでは、 高温焼成を必要とするため、製造コストが高くつ
く。[Problems to be Solved by the Invention] In the conventional monolithic ceramic capacitor in which the external electrodes are manufactured in this manner, high temperature firing is required, and thus the manufacturing cost is high.
焼成条件やガラスフリットの耐湿性等の影響によ
り、得られる積層セラミックコンデンサの品質が左右さ
れるため、信頼性の高い積層セラミックコンデンサを得
ることが難しい。Since the quality of the obtained monolithic ceramic capacitor depends on the firing conditions and the moisture resistance of the glass frit, it is difficult to obtain a highly reliable monolithic ceramic capacitor.
外部電極が高硬度の金属焼結構造であるため、温度
サイクルで誘電体にクラックを発生させるおそれがあ
る。Since the external electrode has a high-hardness metal sintered structure, cracks may occur in the dielectric during temperature cycling.
等の問題点があった。There were problems such as.
本発明は上記従来の問題点を解決し、高特性で信頼性の
高い積層セラミックコンデンサであって、低コストで製
造することができる積層セラミックコンデンサを提供す
ることを目的とする。An object of the present invention is to solve the above conventional problems and to provide a monolithic ceramic capacitor having high characteristics and high reliability, which can be manufactured at low cost.
［課題を解決するための手段］ 本発明の積層セラミックコンデンサは、内部電極及び該
内部電極に導通する外部電極を有する積層セラミックコ
ンデンサにおいて、該外部電極は金属粉末を含有する熱
硬化性樹脂で構成されており、外部電極中の金属粉末の
含有量Ｍと熱硬化性樹脂の含有量Ｒとの重量比M/Rが2.5
〜16であることを特徴とする。[Means for Solving the Problems] The monolithic ceramic capacitor of the present invention is a monolithic ceramic capacitor having an internal electrode and an external electrode electrically connected to the internal electrode, the external electrode being made of a thermosetting resin containing metal powder. The weight ratio M / R between the content M of the metal powder and the content R of the thermosetting resin in the external electrode is 2.5.
It is characterized by being ~ 16.
以下に本発明を詳細に説明する。The present invention will be described in detail below.
本発明の積層セラミックコンデンサの外部電極を構成す
る金属粉末としては、特に制限はなく、従来の積層セラ
ミックコンデンサの外部電極に用いられているものを好
適に使用することができる。具体的には、銀（Ag）粉
末、パラジウム（Pd）粉末等の貴金属粉末のほか、ニッ
ケル（Ni）等の金属粉末、或いはこれらの混合粉末等を
用いることができる。また、このような金属粉末の粒径
についても特に制限はなく、従来採用されている粒径の
ものを用いることができる。The metal powder forming the external electrode of the monolithic ceramic capacitor of the present invention is not particularly limited, and those used for the external electrode of the conventional monolithic ceramic capacitor can be preferably used. Specifically, in addition to noble metal powders such as silver (Ag) powder and palladium (Pd) powder, metal powders such as nickel (Ni), and mixed powders thereof can be used. The particle size of such metal powder is also not particularly limited, and those having a particle size conventionally used can be used.
熱硬化性樹脂としては180〜250℃の温度で硬化するもの
が好ましい。熱硬化性樹脂の具体例としてはフェノール
樹脂、キシレン樹脂、ウレタン樹脂等が挙げられる。As the thermosetting resin, those that cure at a temperature of 180 to 250 ° C. are preferable. Specific examples of the thermosetting resin include phenol resin, xylene resin and urethane resin.
このような熱硬化性樹脂は、金属粉末と混合してペース
トとし、予め内部電極が形成された誘電体に塗布した
後、加熱硬化することにより容易に外部電極とすること
ができる。なお、このペーストの調製にあたり、ペース
トの粘度が高過ぎる場合には、必要に応じて適当な溶
剤、例えば、ブチルカルビトールを混合使用する。この
場合、金属粉末、熱硬化性樹脂及び溶剤の配合割合は、
金属粉末50〜80重量％、熱硬化性樹脂５〜20重量％、溶
剤５〜30重量％の範囲で適宜決定される。従って、形成
された外部電極中の金属粉末の含有量Ｍと熱硬化性樹脂
の含有量Ｒとの比M/Rは、50/20〜80/5即ち2.5〜16とな
る。Such a thermosetting resin can be easily formed into an external electrode by mixing it with a metal powder to form a paste, applying the paste to a dielectric having an internal electrode formed in advance, and then curing the paste by heating. In preparing the paste, if the viscosity of the paste is too high, an appropriate solvent such as butyl carbitol is mixed and used as needed. In this case, the mixing ratio of the metal powder, the thermosetting resin and the solvent is
It is appropriately determined within the range of 50 to 80% by weight of metal powder, 5 to 20% by weight of thermosetting resin, and 5 to 30% by weight of solvent. Therefore, the ratio M / R of the content M of the metal powder and the content R of the thermosetting resin in the formed external electrode is 50/20 to 80/5, that is, 2.5 to 16.
本発明の積層セラミックコンデンサは、外部電極を形成
するにあたり、金属粉末、熱硬化性樹脂及び必要に応じ
て溶剤の所定量を混合してなるペーストを塗布した後、
加熱硬化させること以外は、従来の積層セラミックコン
デンサと同様に製造することができる。なお、上記加熱
硬化は、通常、用いた熱硬化性樹脂の硬化温度、例えば
180〜250℃で30分程度行なう。The multilayer ceramic capacitor of the present invention, when forming the external electrode, after applying a paste prepared by mixing a predetermined amount of metal powder, thermosetting resin and solvent if necessary,
It can be manufactured in the same manner as a conventional monolithic ceramic capacitor except that it is cured by heating. The heat curing is usually a curing temperature of the thermosetting resin used, for example,
Perform at 180-250 ℃ for about 30 minutes.
［作用］ 本発明の積層セラミックコンデンサは、外部電極が金属
粉末を熱硬化性樹脂で成形硬化してなるものであるた
め、高温焼成を必要としない。このため、製造コストが
低廉化され、品質の安定した信頼性の高い積層セラミッ
クコンデンサが得られる。このような外部電極を有する
積層セラミックコンデンサでは、外部電極の熱歪による
誘電体内のクラック発生も防止される。[Operation] The multilayer ceramic capacitor of the present invention does not require high temperature firing because the external electrodes are formed by molding and curing metal powder with a thermosetting resin. Therefore, the manufacturing cost can be reduced, and a monolithic ceramic capacitor with stable quality and high reliability can be obtained. In the monolithic ceramic capacitor having such external electrodes, cracking in the dielectric body due to thermal strain of the external electrodes is also prevented.
［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.
実施例１、比較例１ 下記配合のAgペーストを、鉛ペロブスカイト系のセラミ
ック誘電体に塗布し、次いで200℃で30分加熱して硬化
させることにより、本発明の積層セラミックコンデンサ
を製造した。Example 1 and Comparative Example 1 A multilayer ceramic capacitor of the present invention was manufactured by applying an Ag paste having the following composition to a lead perovskite ceramic dielectric and then heating it at 200 ° C. for 30 minutes to cure it.
Agペースト配合（重量％） Ag粉末（平均粒径２μｍ）:75 熱硬化性樹脂:6.2 溶剤：残部 得られた積層セラミックコンデンサの電気的特性を下記
方法に従って調べ、従来の焼成型外部電極よりなる積層
セラミックコンデンサ（比較例１）と比較した。Ag paste composition (% by weight) Ag powder (average particle size 2 μm): 75 Thermosetting resin: 6.2 Solvent: Remainder The electrical characteristics of the obtained monolithic ceramic capacitor were investigated according to the following methods, and consisted of conventional firing type external electrodes. It was compared with a monolithic ceramic capacitor (Comparative Example 1).
結果を第１表に示す。The results are shown in Table 1.
なお、試験は試料30個について行ない（耐湿負荷試験の
み20個）、容量、tanδについては最大、最小及び平均
値を示した。また、絶縁抵抗については最大、最小値を
示した。The test was carried out on 30 samples (20 samples for moisture resistance load test only), and the maximum, minimum and average values for capacity and tan δ were shown. Also, the insulation resistance showed the maximum and minimum values.
容量（nF）,tanδ（％） 1kHz、1Vで測定した。Capacity (nF), tan δ (%) Measured at 1kHz and 1V.
絶縁抵抗（Ω） 25V、DC5秒印加後、30秒後の値を示す。Insulation resistance (Ω) 25V, after applying DC 5 seconds, shows the value 30 seconds later.
温度サイクル耐久性 −25℃（30分）→常温（３分）→＋85℃（30分）の熱サ
イクルを100サイクル行ない、容量低下の生じた試料個
数で示した。Temperature cycle durability The heat cycle of −25 ° C. (30 minutes) → normal temperature (3 minutes) → + 85 ° C. (30 minutes) was performed 100 times, and the number of samples in which the capacity decreased was shown.
信頼性（耐湿負荷試験） ＋85℃、85％RH、DC16V印加を1000時間行ない、劣化の
有無を調べた。Reliability (moisture resistance load test) + 85 ° C, 85% RH, DC16V was applied for 1000 hours to check for deterioration.
比較例２ Agペーストの配合を下記の通りとしたこと以外は実施例
１と同様にして積層セラミックコンデンサを製造し、同
様にその電気的特性を調べ、結果を第１表に示した。Comparative Example 2 A laminated ceramic capacitor was manufactured in the same manner as in Example 1 except that the composition of the Ag paste was changed as follows, and its electrical characteristics were examined in the same manner, and the results are shown in Table 1.
Agペースト配合（重量％） Ag粉末（平均粒径２μｍ）:45 熱硬化性樹脂:45 溶剤：残部 第１表より、本発明の積層セラミックコンデンサは高特
性でしかも品質安定性に優れ、信頼性の高い積層セラミ
ックコンデンサであることが明らかである。Ag paste formulation (wt%) Ag powder (average particle size 2 μm): 45 Thermosetting resin: 45 Solvent: balance From Table 1, it is clear that the monolithic ceramic capacitor of the present invention is a monolithic ceramic capacitor having high characteristics, excellent quality stability, and high reliability.
［発明の効果］ 以上詳述した通り、本発明の積層セラミックコンデンサ
によれば、各種特性に優れ、しかも品質の安定性に優れ
た信頼性の高い積層セラミックコンデンサであって、低
コストで製造することが可能な積層セラミックコンデン
サが提供される。[Effects of the Invention] As described in detail above, according to the monolithic ceramic capacitor of the present invention, it is a monolithic ceramic capacitor which is excellent in various characteristics and is stable in quality, and which is highly reliable. It is possible to provide a monolithic ceramic capacitor.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 原田 次郎 埼玉県秩父郡横瀬町大字横瀬2270番地 三 菱鉱業セメント株式会社セラミックス研究 所内 (72)発明者 古川 雅啓 埼玉県秩父郡横瀬町大字横瀬2270番地 三 菱鉱業セメント株式会社セラミックス研究 所内 (72)発明者 石川 良彦 埼玉県秩父郡横瀬町大字横瀬2270番地 三 菱鉱業セメント株式会社セラミックス研究 所内 (56)参考文献 特開 昭64−65820（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jiro Harada 2270, Yokoze, Yokose-cho, Chichibu-gun, Saitama Sanryo Mining & Cement Co., Ltd. Ceramics Research Institute (72) Masahiro Furukawa 2270 Yokose, Yokose-cho, Chichibu-gun, Saitama Sanryo Mining Cement Co., Ltd. Ceramics Research Laboratory (72) Inventor Yoshihiko Ishikawa 2270, Yokose, Yokose-cho, Chichibu-gun, Saitama Prefecture Sanryo Mining Cement Co., Ltd. Ceramics Research Laboratory (56) References JP 64-65820 (JP, A) )
Claims (1)
極を有する積層セラミックコンデンサにおいて、該外部
電極は金属粉末を含有する熱硬化性樹脂で構成されてお
り、外部電極中の金属粉末の含有量Ｍと熱硬化性樹脂の
含有量Ｒとの重量比M/Rが2.5〜16であることを特徴とす
る積層セラミックコンデンサ。1. A monolithic ceramic capacitor having an internal electrode and an external electrode electrically connected to the internal electrode, wherein the external electrode is composed of a thermosetting resin containing a metal powder, and the external electrode contains the metal powder. A multilayer ceramic capacitor, characterized in that a weight ratio M / R of the amount M and the content R of the thermosetting resin is 2.5 to 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2069494A JPH0766894B2 (en) | 1990-03-19 | 1990-03-19 | Monolithic ceramic capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2069494A JPH0766894B2 (en) | 1990-03-19 | 1990-03-19 | Monolithic ceramic capacitors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03270003A JPH03270003A (en) | 1991-12-02 |
| JPH0766894B2 true JPH0766894B2 (en) | 1995-07-19 |
Family
ID=13404325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2069494A Expired - Lifetime JPH0766894B2 (en) | 1990-03-19 | 1990-03-19 | Monolithic ceramic capacitors |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0766894B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1178232C (en) | 1999-04-26 | 2004-12-01 | 松下电器产业株式会社 | Electronic spare parts and radio terminal device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6165820U (en) * | 1984-10-04 | 1986-05-06 | ||
| JPS6465820A (en) * | 1987-09-07 | 1989-03-13 | Matsushita Electric Ind Co Ltd | Ink for printing electrode on ceramic |
-
1990
- 1990-03-19 JP JP2069494A patent/JPH0766894B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03270003A (en) | 1991-12-02 |
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