JP2011210874A - 電子部品および電子部品の製造方法 - Google Patents
電子部品および電子部品の製造方法 Download PDFInfo
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- JP2011210874A JP2011210874A JP2010075939A JP2010075939A JP2011210874A JP 2011210874 A JP2011210874 A JP 2011210874A JP 2010075939 A JP2010075939 A JP 2010075939A JP 2010075939 A JP2010075939 A JP 2010075939A JP 2011210874 A JP2011210874 A JP 2011210874A
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Abstract
【解決手段】内部電極層と誘電体層とが交互に複数積層された電子部品であって、前記内部電極層の積層方向の一端面で接している第1誘電体粒子の粒径が、前記内部電極層の積層方向の他端面で接している第2誘電体粒子の粒径より大きく、前記第1誘電体粒子により形成される第1セラミック層は前記第2誘電体粒子により形成される第2セラミック層に比べ厚みが小さいことを特徴とする電子部品。
【選択図】図2
Description
内部電極層と誘電体層とが交互に複数積層された電子部品であって、
前記内部電極層の積層方向の一端面で接している第1誘電体粒子の粒径が、前記内部電極層の積層方向の他端面で接している第2誘電体粒子の粒径より大きく、
前記第1誘電体粒子により形成される第1セラミック層は前記第2誘電体粒子により形成される第2セラミック層に比べ厚みが小さいことを特徴とする。
第1セラミック粒子と導電性粒子とを含む内部電極層用ペーストを準備する工程と、
第2セラミック粒子を含む誘電体層用ペーストを準備する工程と、
前記誘電体層用ペーストを支持体に塗布することでグリーンシートを得る工程と、
前記グリーンシート上に内部電極パターン層が形成されたシートユニットを得る工程と、
前記シートユニットを積層しグリーンチップを得る工程と、
前記グリーンチップを焼成し素子本体を得る工程と、を有し、
前記シートユニットに形成された内部電極パターン層のグリーンシートに接している面に比較して、接していない面の近傍には前記第1セラミック粒子が多く偏在していることを特徴とする。
図1に示すように、本発明の一実施形態に係る積層セラミックコンデンサ1は、素子本体10を有する。前記素子本体10は、誘電体層20と内部電極層30とが交互に積層された構造である。素子本体10の形状に特に制限はないが、通常、直方体状とされる。また、その寸法にも特に制限はなく、用途に応じて適当な寸法とすればよい。図1に示すように、前記素子本体10の両側端部には、素子本体10の内部で交互に配置された内部電極層30と各々導通する一対の外部電極4が形成してある。
内部電極層30の厚みは用途等に応じて適宜決定すればよいが、通常、0.5〜5μm、特に0.5〜2.5μm程度であることが好ましい。
外部電極4の厚みは用途等に応じて適宜決定されればよいが、通常、10〜50μm程度であることが好ましい。
外部電極は導電性粉末により構成される。導電性粉末としては例えば卑金属が挙げられるが特に限定されず、安価なNi,Cuや、これらの合金を用いることができる。
前記誘電体層20は、図2に示すように前記第1誘電体粒子221により形成される第1セラミック層21と、前記第2誘電体粒子222により形成される第2セラミック層22とを有し、前記第1セラミック層21は前記第2セラミック層22に比べ厚みが小さい。また、図2に示すように、前記内部電極層30の積層方向の一端面で接している第1誘電体粒子221の粒径が、前記内部電極層30の積層方向の他端面で接している第2誘電体粒子222の粒径より大きい。
第1副成分:0.1〜5モル、
第2副成分:1〜10モル、
第3副成分:0.01〜0.2モル、
第4副成分:0.1〜12モル、
である。
本発明の実施形態に係る積層セラミックコンデンサは、従来の積層セラミックコンデンサと同様に、ペーストを用いた通常の印刷法やシート法によりグリーンチップを作製し、これを焼成した後、外部電極を印刷または転写して焼成することにより製造される。以下、製造方法について具体的に説明する。
本発明の実施形態に係る内部電極層用ペーストは第1セラミック粒子と導電性粒子とを含み、第1セラミック粒子および導電性粒子を有機ビヒクルまたは水系ビヒクルとともに混練することにより塗料化して調整される。
本発明の実施形態に係る誘電体層用ペーストは、第2セラミック粒子を含み、第2セラミック粒子を前記有機ビヒクルまたは前記水系ビヒクルとともに混練することにより塗料化して調整される。
外部電極用ペーストに含有される外部電極用ペーストは、上記した導電性粉末、および有機ビヒクルを混練し、上記した内部電極層用ペーストと同様にして調製すればよい。
本発明の実施形態に係るグリーンチップは、グリーンシートと内部電極パターン層とを有するシートユニットを複数積層させることにより得られる。
グリーンチップはバレル研磨等された後、水で洗浄され、乾燥され、焼成される。なお、焼成前に、グリーンチップに脱バインダ処理を施す。脱バインダ処理は、内部電極層用ペースト中の導電材の種類に応じて適宜決定されればよいが、導電材としてNiやNi合金等の卑金属を用いる場合、脱バインダ雰囲気中の酸素分圧を10−45〜105Paとすることが好ましい。酸素分圧が前記範囲含まれると、脱バインダ効果が上がり、内部電極層の酸化が低減される傾向にある。
(第1セラミック粒子および第2セラミック粒子)
まず、第1セラミック粒子および第2セラミック粒子を作製するための出発原料として、焼成後の組成が、主成分であるBaTiO3 100モルに対して、MgO1モル、(Ba0.6Ca0.4)SiO3:3モル、V2O5:0.1モル、Y2O3:2モル、MnO:0.374モル、となるように配合して、ボールミルにより1 6 時間湿式混合し、乾燥させ第1セラミック粒子と第2セラミック粒子の原料粒子(以下、セラミック原料粒子という)を得た。
得られたセラミック原料粒子をボールミルで15時間、湿式粉砕し、乾燥し、0.1μmの第1セラミック粒子を得た。次いで、平均粒径が0.4μmのNi粒子100重量部に対して、第1セラミック粒子を20重量部と、有機ビヒクル(エチルセルロース8重量部をブチルカルビトール92重量部に溶解したもの)40重量部と、ブチルカルビトール10重量部と、を3本ロールにより混練してペースト化し内部電極層用ペーストを得た。
得られたセラミック原料粒子をボールミルで15時間、湿式粉砕し、乾燥し、0.25μmの第2セラミック粒子を得た。次いで、これらと、アクリル樹脂4.8 重量部と、酢酸エチル100重量部と、ミネラルスピリット6重量部と、トルエン4重量部とをボールミルで混合してペースト化し、誘電体層用ペーストを得た。
平均粒径0.5μmのCu粒子100重量部と、有機ビヒクル(エチルセルロース樹脂8重量部をブチルカルビトール92重量部に溶解したもの)35重量部及びブチルカルビトール7重量部とを混練してペースト化し、外部電極用ペーストを得た。
得られた誘電体層用ペーストを用いて、PETフィルム上に、ドクターブレード法によりシート成形を行い、乾燥することにより、グリーンシートを形成した。このとき、グリーンシートの厚みは、3.0μmとした。この上に内部電極層用ペーストを印刷することによりシートユニットを得た後、PETフィルムからシートユニットを剥離した。次いで、これらのシートユニットを複数積層することにより積層体を得た。シートユニットの積層数は200層であった。
このようにして得た素子本体に、サンドブラスト等にて端面研磨を施し、外部電極としてCuを塗布し、外部電極6,8を形成することによりコンデンサ試料を得た。
抗折強度はJIS−R1601に規定される3点式測定法に準拠して以下のとおり測定した。まず、コーナーに幅W1の段を設けた一対の治具44を幅W2の間隔で置いた。そして、図4に示すように素体本体42を治具44の段部分に置いた。その後、幅:2.0mm、底面の曲率半径:0.5mmの荷重46により速度30mm/minで素体本体42を加圧し、破壊した時点の荷重圧力を求めた。荷重圧力は単位[N]で表され、本実施例では、65N以上を良好とし、80N以上を好ましい範囲とした。
コンデンサ試料に対し、160℃で10V/μmの直流電圧の印加状態に保持することにより、高温負荷寿命を測定した。本実施例では印加開始から抵抗が一桁落ちるまでの時間を寿命と定義し、これを10個のコンデンサ試料に対して行い、その平均寿命時間を算出した。本実施例では、20時間以上を良好とした。
第1セラミック粒子の粒径rC1および第2セラミック粒子の粒径rC2を変えた以外は試料1と同様にして素子本体およびコンデンサ試料を作成し、抗折強度および高温負荷寿命を測定した。結果を表1に示す。
第1セラミック粒子の粒径rC1、内部電極層用ペーストに含まれる第1セラミック粒子の含有量およびシートユニットの乾燥温度を表2に示すものとした以外は試料1と同様にして素子本体およびコンデンサ試料を作成し、抗折強度および高温負荷寿命を測定した。結果を表2に示す。
第1セラミック粒子の粒径rC1、内部電極層用ペーストに含まれる第1セラミック粒子の含有量を表3に示すものとした以外は試料1と同様にして素子本体およびコンデンサ試料を作成し、抗折強度および高温負荷寿命を測定した。結果を表3に示す。
試料1〜7より、第1誘電体粒子を有する場合は(試料1、3〜7)、第1誘電体粒子を有しない場合(試料2)に比べて抗折強度が高くなることが確認できた。
また、t1/(t1+t2)が、0.160≦t1/(t1+t2)≦0.275の範囲に含まれる場合には(試料1、3〜5)、抗折強度および高温負荷寿命が良好なものとなることが確認できた。
試料11〜13より、乾燥温度が80℃以下の場合には(試料11、13)、乾燥温度が80℃を超える場合(試料11)に比べて抗折強度が高くなることが確認できた。これは、乾燥温度が80℃を超えると、内部電極パターン層130において対流が起こり、乾燥時間を設けても、図3gに示すように第1セラミック粒子は偏在せず、内部電極パターン層中に平均的に存在することにより、第1誘電体粒子が形成されないためであると考えられる。
試料21〜25より、内部電極層用ペーストに含まれる導電性粒子を100重量部としたときの内部電極層用ペーストに含まれる第1セラミック粒子の含有量が10〜20重量部の範囲に含まれる場合には(試料22〜24)、第1セラミック粒子の含有量が当該範囲から外れる場合(試料21、25)に比べて抗折強度および高温負荷寿命が良好なものとなることが確認できた。これより、第1セラミック粒子が少なすぎると(試料21)、第1誘電体粒子が形成されず、このため、抗折強度が低下すると考えられる。また、第1セラミック粒子が多すぎると(試料25)、第1セラミック層の厚みが第2セラミック層の厚みより厚くなりすぎ、このため、高温負荷寿命が低下すると考えられる。
10… 素子本体
20… 誘電体層
21… 第1セラミック層
22… 第2セラミック層
30… 内部電極層
4… 外部電極
221… 第1誘電体粒子
222… 第2誘電体粒子
230… 導電材
100… 支持体
120,120A,120B,120C… グリーンシート
130,130A,130B,130C… 内部電極パターン層
322,322A,322B,322C… 第2セラミック粒子
330,330A,330B,330C… 導電性粒子
331,331A,331B,331C… 第1セラミック粒子
140,140A,140B,140C… シートユニット
150… 積層体
42… 素体本体
44… 治具
46… 荷重
Claims (9)
- 内部電極層と誘電体層とが交互に複数積層された電子部品であって、
前記内部電極層の積層方向の一端面で接している第1誘電体粒子の粒径が、前記内部電極層の積層方向の他端面で接している第2誘電体粒子の粒径より大きく、
前記第1誘電体粒子により形成される第1セラミック層は前記第2誘電体粒子により形成される第2セラミック層に比べ厚みが小さいことを特徴とする電子部品。 - 前記第1セラミック層の厚みをt1、第2セラミック層の厚みをt2としたとき、0.160≦t1/(t1+t2)≦0.275である請求項1に記載の電子部品。
- 前記第1誘電体粒子の粒径をr1、前記第2誘電体粒子の粒径をr2としたとき、r1/r2≦2.17である請求項1または2に記載の電子部品。
- 前記第1セラミック層は、積層方向に存在する単一の前記第1誘電体粒子が平面上に並んで構成される請求項1〜3のいずれかに記載の電子部品。
- 前記電子部品が積層セラミックコンデンサである請求項1〜4のいずれかに記載の電子部品。
- 第1セラミック粒子と導電性粒子とを含む内部電極層用ペーストを準備する工程と、
第2セラミック粒子を含む誘電体層用ペーストを準備する工程と、
前記誘電体層用ペーストを支持体に塗布することでグリーンシートを得る工程と、
前記グリーンシート上に内部電極パターン層が形成されたシートユニットを得る工程と、
前記シートユニットを積層しグリーンチップを得る工程と、
前記グリーンチップを焼成し素子本体を得る工程と、を有し、
前記シートユニットに形成された内部電極パターン層のグリーンシートに接している面に比較して、接していない面の近傍には前記第1セラミック粒子が多く偏在していることを特徴とする電子部品の製造方法。 - さらに、前記シートユニットを80℃以下で乾燥する工程を有する請求項6に記載の電子部品の製造方法。
- 前記内部電極パターン層に含まれる導電性粒子の含有量を100重量部としたとき、内部電極パターン層に含まれる前記第1セラミック粒子の含有量が10〜20重量部である請求項6または7に記載の電子部品の製造方法。
- 前記電子部品が積層セラミックコンデンサである請求項6〜8のいずれかに記載の電子部品の製造方法。
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