JP7545200B2 - セラミック電子部品およびその製造方法 - Google Patents
セラミック電子部品およびその製造方法 Download PDFInfo
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- JP7545200B2 JP7545200B2 JP2019190493A JP2019190493A JP7545200B2 JP 7545200 B2 JP7545200 B2 JP 7545200B2 JP 2019190493 A JP2019190493 A JP 2019190493A JP 2019190493 A JP2019190493 A JP 2019190493A JP 7545200 B2 JP7545200 B2 JP 7545200B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B18/00—Layered products essentially comprising ceramics, e.g. refractory products
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
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Description
まず、積層セラミックコンデンサの概要について説明する。図1は、実施形態に係る積層セラミックコンデンサ100の部分断面斜視図である。図2は、図1のA-A線断面図である。図3は、図1のB-B線断面図である。図1~図3で例示するように、積層セラミックコンデンサ100は、直方体形状を有する積層チップ10と、積層チップ10のいずれかの対向する2端面に設けられた外部電極20a,20bとを備える。なお、積層チップ10の当該2端面以外の4面のうち、積層方向の上面および下面以外の2面を側面と称する。外部電極20a,20bは、積層チップ10の積層方向の上面、下面および2側面に延在している。ただし、外部電極20a,20bは、互いに離間している。
まず、誘電体層11を形成するための誘電体材料を用意する。誘電体材料は、誘電体層11の主成分セラミックを含む。誘電体層11に含まれるAサイト元素およびBサイト元素は、通常はABO3の粒子の焼結体の形で誘電体層11に含まれる。例えば、BaTiO3は、ペロブスカイト構造を有する正方晶化合物であって、高い誘電率を示す。このBaTiO3は、一般的に、二酸化チタンなどのチタン原料と炭酸バリウムなどのバリウム原料とを反応させてチタン酸バリウムを合成することで得ることができる。誘電体層11の主成分セラミックの合成方法としては、従来種々の方法が知られており、例えば固相法、ゾル-ゲル法、水熱法等が知られている。本実施形態においては、これらのいずれも採用することができる。
次に、原料粉末作製工程で得られた誘電体材料に、ポリビニルブチラール(PVB)樹脂等のバインダと、エタノール、トルエン等の有機溶剤と、可塑剤とを加えて湿式混合する。得られたスラリーを使用して、例えばダイコータ法やドクターブレード法により、基材上に例えば厚み0.8μm以下の帯状の誘電体グリーンシート51を塗工して乾燥させる。
このようにして得られたセラミック積層体を、N2雰囲気で脱バインダ処理した後に外部電極20a,20bの下地となるNiペーストをディップ法で塗布し、酸素分圧10-5~10-8atmの還元雰囲気中で1100~1300℃で10分~2時間焼成する。このようにして、積層セラミックコンデンサ100が得られる。
その後、N2ガス雰囲気中で600℃~1000℃で再酸化処理を行ってもよい。
その後、めっき処理により、外部電極20a,20bに、Cu,Ni,Sn等の金属コーティングを行ってもよい。
チタン酸バリウム粉末に対して添加物を添加し、ボールミルで十分に湿式混合粉砕して誘電体材料を得た。チタン酸バリウム粉末に対して添加物を添加し、ボールミルで十分に湿式混合粉砕して逆パターン材料を得た。チタン酸バリウム粉末に対して添加物を添加し、ボールミルで十分に湿式混合粉砕してカバー材料を得た。
実施例2では、セラミック保護部50に対応する領域において、Zr/Ti比を0.040としたこと以外は、実施例1と同様の条件とした。
実施例3では、セラミック保護部50に対応する領域において、Zr/Ti比を0.080としたこと以外は、実施例1と同様の条件とした。
実施例4では、セラミック保護部50に対応する領域において、Zr/Ti比を0.16としたこと以外は、実施例1と同様の条件とした。
比較例1では、セラミック保護部50に対応する領域において、Zr/Ti比を0.0020としたこと以外は、実施例1と同様の条件とした。
比較例2では、セラミック保護部50に対応する領域において、Zr/Ti比を0.32としたこと以外は、実施例1と同様の条件とした。
実施例5では、セラミック保護部50に対応する領域において、A/B比を0.922としたこと以外は、実施例3と同様の条件とした。
実施例6では、セラミック保護部50に対応する領域において、A/B比を0.942としたこと以外は、実施例3と同様の条件とした。
実施例7では、セラミック保護部50に対応する領域において、A/B比を0.982としたこと以外は、実施例3と同様の条件とした。
比較例3では、セラミック保護部50に対応する領域において、A/B比を1.002としたこと以外は、実施例3と同様の条件とした。
11 誘電体層
12 内部電極層
13 カバー層
14 容量領域
15 エンドマージン
16 サイドマージン
20a,20b 外部電極
50 セラミック保護部
100 積層セラミックコンデンサ
Claims (13)
- セラミックを主成分とする誘電体層と、内部電極層と、が交互に積層され、略直方体形状を有し、積層された複数の前記内部電極層が交互に対向する2端面に露出するように形成された積層構造を備え、
前記積層構造の積層方向の上面および下面の少なくとも一方に設けられたカバー層と、前記積層構造において積層された複数の前記内部電極層が前記2端面以外の2側面に延びた端部を覆うように設けられたサイドマージンとで構成されるセラミック保護部の主成分セラミックは、一般式ABO3で表されるペロブスカイト構造を有するセラミック材料であり、Aサイトに少なくともBaを含み、Bサイトに少なくともTiおよびZrを含み、ZrとTiとのモル比であるZr/Ti比が0.010以上0.25以下であり、AサイトとBサイトのモル比であるA/B比が0.960以下であることを特徴とするセラミック電子部品。 - 前記セラミック保護部の表面におけるビッカース硬さHVは、600以上であることを特徴とする請求項1記載のセラミック電子部品。
- 前記セラミック保護部の表面における平均結晶粒子径は、2.0μm以下であることを特徴とする請求項1または2に記載のセラミック電子部品。
- 前記内部電極層は、NiまたはCuを主成分とすることを特徴とする請求項1~3のいずれか一項に記載のセラミック電子部品。
- 前記2端面のうち異なる端面に露出する内部電極層同士が対向する容量領域の前記誘電体層における主成分セラミックは、前記セラミック保護部の主成分セラミックと同組成を有することを特徴とする請求項1~4のいずれか一項に記載のセラミック電子部品。
- 前記Zr/Ti比が0.020以上0.040以下であることを特徴とする請求項1~5のいずれか一項に記載のセラミック電子部品。
- 前記Zr/Ti比が0.080以上0.16以下であることを特徴とする請求項1~5のいずれか一項に記載のセラミック電子部品。
- 前記Zr/Ti比は、0.020以上0.040以下であるか、0.080以上0.16以下であり、
前記Aサイトは、カルシウムを含まないことを特徴とする請求項1~5のいずれか一項に記載のセラミック電子部品。 - 前記A/B比は、0.922以上0.960以下であることを特徴とする請求項1~8のいずれか一項に記載のセラミック電子部品。
- セラミックを主成分とする粒子を有するシートと金属導電ペーストのパターンとが、前記金属導電ペーストが対向する2端面に露出するように交互に積層された積層部分と、前記積層部分の積層方向の上面および下面に配置されたカバーシートと、前記積層部分の側面に配置されたサイドマージン領域と、を含むセラミック積層体を準備する工程と、
前記セラミック積層体を焼成する工程と、を含み、
焼成前の前記カバーシートおよび前記サイドマージン領域における主成分セラミックは、一般式ABO3で表されるペロブスカイト構造を有するセラミック材料であり、Aサイトに少なくともBaを含み、Bサイトに少なくともTiおよびZrを含み、ZrとTiとのモル比であるZr/Ti比が0.010以上0.25以下であり、AサイトとBサイトのモル比であるA/B比が0.960以下であることを特徴とするセラミック電子部品の製造方法。 - 前記焼成する工程における昇温速度の最大値は、6000℃/h以上であることを特徴とする請求項10記載のセラミック電子部品の製造方法。
- 焼成後における前記カバーシートおよび前記サイドマージン領域の表面における平均結晶粒子径が2.0μm以下となるように、前記焼成する工程における条件を調整することを特徴とする請求項10または11に記載のセラミック電子部品の製造方法。
- 前記カバーシートおよび前記サイドマージン領域における主成分セラミックの平均粒径に対して、焼成後における前記カバーシートおよび前記サイドマージン領域の表面における平均結晶粒子径が10倍以下となるように、前記焼成する工程における条件を調整することを特徴とする請求項10~12のいずれか一項に記載のセラミック電子部品の製造方法。
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TWI814730B (zh) * | 2017-07-19 | 2023-09-11 | 日商太陽誘電股份有限公司 | 積層陶瓷電容器及其製造方法 |
JP6939611B2 (ja) * | 2018-01-31 | 2021-09-22 | Tdk株式会社 | 誘電体磁器組成物および積層セラミックコンデンサ |
US11289272B2 (en) * | 2018-03-27 | 2022-03-29 | Tdk Corporation | Multilayer ceramic electronic component |
JP6595670B2 (ja) | 2018-07-10 | 2019-10-23 | 太陽誘電株式会社 | 積層セラミックコンデンサ |
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JP2012206890A (ja) | 2011-03-29 | 2012-10-25 | Tdk Corp | 半導体セラミックおよび積層型半導体セラミックコンデンサ |
JP2016169130A (ja) | 2015-03-13 | 2016-09-23 | Tdk株式会社 | 誘電体磁器組成物およびセラミック電子部品 |
JP2016195144A (ja) | 2015-03-31 | 2016-11-17 | Tdk株式会社 | 積層セラミック電子部品 |
JP2019176176A (ja) | 2019-06-17 | 2019-10-10 | 太陽誘電株式会社 | 積層セラミックコンデンサ |
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