JP2021019005A - 積層セラミックコンデンサ及びその製造方法 - Google Patents
積層セラミックコンデンサ及びその製造方法 Download PDFInfo
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- JP2021019005A JP2021019005A JP2019131810A JP2019131810A JP2021019005A JP 2021019005 A JP2021019005 A JP 2021019005A JP 2019131810 A JP2019131810 A JP 2019131810A JP 2019131810 A JP2019131810 A JP 2019131810A JP 2021019005 A JP2021019005 A JP 2021019005A
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- 239000003985 ceramic capacitor Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims description 26
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 150000001875 compounds Chemical class 0.000 claims abstract description 70
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims description 33
- 239000002994 raw material Substances 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 12
- 238000010304 firing Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000009499 grossing Methods 0.000 claims description 6
- 229910052726 zirconium Inorganic materials 0.000 claims description 6
- 229910052692 Dysprosium Inorganic materials 0.000 claims description 3
- 229910052691 Erbium Inorganic materials 0.000 claims description 3
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 3
- 229910052689 Holmium Inorganic materials 0.000 claims description 3
- 229910052765 Lutetium Inorganic materials 0.000 claims description 3
- 229910052771 Terbium Inorganic materials 0.000 claims description 3
- 229910052775 Thulium Inorganic materials 0.000 claims description 3
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000007639 printing Methods 0.000 claims description 3
- 229910052727 yttrium Inorganic materials 0.000 claims description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 16
- 238000007747 plating Methods 0.000 description 13
- 239000010949 copper Substances 0.000 description 8
- 239000002002 slurry Substances 0.000 description 7
- 239000003989 dielectric material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 6
- 239000000654 additive Substances 0.000 description 5
- 239000011135 tin Substances 0.000 description 5
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- 229910010413 TiO 2 Inorganic materials 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 229910052718 tin Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- -1 for example Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- DHKHKXVYLBGOIT-UHFFFAOYSA-N 1,1-Diethoxyethane Chemical compound CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- 208000005156 Dehydration Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000011354 acetal resin Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007606 doctor blade method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000004993 emission spectroscopy Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000005621 ferroelectricity Effects 0.000 description 1
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- 238000005498 polishing Methods 0.000 description 1
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- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
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- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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Abstract
Description
[1] 誘電体層と内部電極層とが交互に積層された積層体を備える積層セラミックコンデンサであって、
前記誘電体層は、(Ba(1−x−y)CaxSry)m(Ti(1−z)Zrz)O3、ただし、0.03≦x≦0.16、0≦y≦0.02、0<z≦0.02、0.99≦m≦1.02を含み、さらに
Re酸化物(Reは希土類元素)を元素換算で1.0〜4.0mol、
Mg化合物を元素換算で0.2〜2.5mol、
Mn化合物を元素換算で0.1〜1.0mol、
Zr化合物を元素換算で0.1〜2.0mol、
V化合物を元素換算で0.05〜0.3mol、
Si化合物を元素換算で0.2〜5.0molを含む積層セラミックコンデンサ。
Re酸化物(Reは希土類元素)を元素換算で1.0〜4.0mol、
Mg化合物を元素換算で0.2〜2.5mol、
Mn化合物を元素換算で0.1〜1.0mol、
M化合物(Mは、Ba、Ca、及びSrから選ばれる少なくとも1種の元素)を元素換算で0〜5.0mol、
Zr化合物を元素換算で0.1〜2.0mol、
V化合物を元素換算で0.05〜0.3mol、
Si化合物を元素換算で0.2〜5.0mol添加した原料を準備する工程と、
前記原料からグリーンシートを成形する工程と、
前記グリーンシートに内部電極層を印刷する工程と、
印刷後の前記グリーンシートを切断した後、その切断したグリーンシートを積層して積層物を得る工程と、
前記積層物をカットして積層体チップを得る工程と、
前記積層体チップを焼成する工程と、
前記積層体チップに、外部電極を形成する工程と、
を含む積層セラミックコンデンサの製造方法。
図1に示すように、積層セラミックコンデンサ10は、略直方体の素体16を備えている。素体16は、6つの面を備えている。本明細書では、素体16の左右の面を端面12a、12bと呼び、上下の面を主面12c、12dと呼び、残りの一対の面を側面12e、12fと呼ぶ。図1において、左右方向は、内部電極層が外部電極14に交互に引き出される方向である。上下方向は、内部電極層と誘電体層とが交互に積層される方向である。
Mg化合物は、例えば、Mgの酸化物、炭酸塩である。
Mn化合物は、例えば、Mnの酸化物、炭酸塩である。
M化合物は、例えば、Mの酸化物、炭酸塩である。
Zr化合物は、例えば、Zrの酸化物である。
V化合物は、例えば、Vの酸化物である。
Si化合物は、例えば、Siの酸化物である。
なお、添加される各元素の化合物は、これら以外の化合物であってもよい。
まず、誘電体層を形成するための原料粉末を調製する。具体的には、平均粒径が150〜200nmであり、組成が(Ba1−x1Cax1)m1TiO3(ただし、0.03≦x1≦0.16、0.99≦m1≦1.02)である粉末100molに対して、Re酸化物(Reは希土類元素)を元素換算で1.0〜4.0mol、Mg化合物を元素換算で0.2〜2.5mol、Mn化合物を元素換算で0.1〜1.0mol、M化合物(Mは、Ba、Ca、及びSrから選ばれる少なくとも1種の元素)を元素換算で0〜5.0mol、Zr化合物を元素換算で0.1〜2.0mol、V化合物を元素換算で0.05〜0.3mol、Si化合物を元素換算で0.2〜5.0mol添加することで原料粉末を調整する。このとき、M化合物及びZr化合物の添加量を調整することによって、最終的な原料粉末に含まれるTiとZrの合計に対する、BaとSrとCaの合計のモル比を、1.000〜1.030となるように調整する。
ステップS10で調製した原料粉末に、分散剤、バインダ、及び有機溶剤を加えて混合することでスラリーを調製する。分散剤としては、例えば、ポリカルボン酸アンモニウムを使用できる。バインダとしては、例えば、ポリビニルブチラール樹脂やポリビニルアセタール樹脂を使用できる。有機溶剤としては、例えば、エタノール及び/又はトルエンを使用できる。スラリー中に原料粉末を均一に分散させるために、例えばボールミルを使用してスラリーを混合してもよい。
PET(ポリエチレンテレフタレート)フィルムなどのキャリアフィルム上に、ステップS12で調製したスラリーを、ドクターブレード法でシート状に塗布して乾燥させることでグリーンシートを成形する。グリーンシートの厚さは、好ましくは、0.4〜15μmである。
複数枚のグリーンシートのうち、内部電極層18を形成するためのグリーンシートの上に、スクリーン印刷法、インクジェット印刷法、あるいはグラビア印刷法などによって、導電ペーストを塗布して所定のパターンを形成する。これにより、グリーンシートの上に、内部電極層18を形成するためのパターンが印刷される。導電ペーストの主成分は、例えばNiやCuなどである。
パターンが印刷されたグリーンシートと、パターンが印刷されていないグリーンシートを、ハンドリングしやすい大きさに切断する。その後、パターンが印刷されたグリーンシートと、パターンが印刷されていないカバー層用のグリーンシートを、所定の順序で、複数枚積み重ねる。パターンが印刷されていないグリーンシートは、最上面、最下面にそれぞれ複数枚積み重ねる。なお、パターンが印刷された複数枚のグリーンシートについては、内部電極層が交互に外部電極に引き出されるように、交互にその位置をずらしながら積み重ねる。複数枚のグリーンシートを積み重ねて得られた積層物を、製品1個のサイズにカットして、積層体チップを得る。なお、カットは、押切り、ブレードダイシングなどの公知の方法で行うことができる。
ステップS18で得られた積層体チップを、バレル研磨する。このような研磨によって、素体16と外部電極14との密着を強固にすることができる。また、素体16の角部の欠けを防止することができる。
ステップS20で研磨した積層体チップの両端面に、焼成後に外部電極の下地を形成する導電ペーストを塗布して乾燥させる。このようなペーストとしては、例えば、Niを含む導電ペーストを用いることができる。
ステップS22で導電ペーストを塗布した積層体チップを、例えば、酸素分圧10−11〜10−8atmの雰囲気中で、30〜300秒の間、1000℃以上の加熱温度で焼成する。これにより、セラミックスからなる誘電体層と内部電極層とが一体化した素体16が得られる。
ステップS24で得られた素体の両端面に形成された外部電極の表面に、Cu、Ni、Snの順番で電解めっき層を形成する。具体的には、ステップS24で得られた複数の素体を、めっき液とともにバレルに収容する。次に、バレルを回転させつつ、めっき液に通電を行う。これにより、素体の両端面に形成された外部電極の表面に、めっき層を形成することができる。Cuめっきは、つぎのNiめっきが形成されやすいように下地層として外部電極の上に形成される。Niめっきは、外部電極のはんだ耐熱性を向上させる目的で形成される。Snめっきは、外部電極のはんだ濡れ性を高める目的で形成される。
1kHz−1Vrmsの条件で、LCRメータを用いて、積層セラミックコンデンサの静電容量を測定した。測定された容量、交差面積、層厚、及び層数より、無負荷誘電率を算出した。また、同じくLCRを用いて、積層セラミックコンデンサのtanδを測定した。tanδが5%を超える場合、積層セラミックコンデンサが所定の性能を満たしていない(×)と判定した。
1kHz−1Vrmsの条件で、LCRメータを用いて、積層セラミックコンデンサの静電容量を測定した。DCバイアスが0の時の静電容量を基準として、DCバイアスが10V印加された時の静電容量の値から変化率(%)を算出した(at 5V/μm)。容量変化率が−40%を超える場合、積層セラミックコンデンサが所定の性能を満たしていない(×)と判定した。
積層セラミックコンデンサの温度を恒温槽中で−55℃から125℃まで変化させた場合の、25℃基準での静電容量値の最大変化率ΔC(%)を測定した。ΔCの絶対値が15%を超える場合、積層セラミックコンデンサが所定の性能を満たしていない(×)と判定した。
積層セラミックコンデンサについて、HALT試験(高温加速寿命試験:Highly Accelerated Limit Test)を実施した。具体的には、150℃の環境下で、DC100V(50V/μm)を継続印加する条件で、1つの試料番号につき30個の積層セラミックコンデンサを用いて、その平均故障時間(MTTF)を測定した。平均故障時間が5000min未満である場合、積層セラミックコンデンサが所定の性能を満たしていない(×)と判定した。
14 外部電極
16 素体
17 誘電体層
18 内部電極層
20 積層体
22 カバー層
24 サイドマージン
[1] 誘電体層と内部電極層とが交互に積層された積層体を備える積層セラミックコンデンサであって、
前記誘電体層は、(Ba(1−x−y)CaxSry)m(Ti(1−z)Zrz)O3、ただし、0.03≦x≦0.16、0≦y≦0.02、0<z≦0.02、0.99≦m≦1.02を含み、さらに
Re酸化物(Reは希土類元素)を元素換算で1.0〜4.0mol、
Mg化合物を元素換算で0.2〜2.5mol、
Mn化合物を元素換算で0.1〜1.0mol、
V化合物を元素換算で0.05〜0.3mol、
Si化合物を元素換算で0.2〜5.0molを含む積層セラミックコンデンサ。
Claims (7)
- 誘電体層と内部電極層とが交互に積層された積層体を備える積層セラミックコンデンサであって、
前記誘電体層は、(Ba(1−x−y)CaxSry)m(Ti(1−z)Zrz)O3、ただし、0.03≦x≦0.16、0≦y≦0.02、0<z≦0.02、0.99≦m≦1.02を含み、さらに
Re酸化物(Reは希土類元素)を元素換算で1.0〜4.0mol、
Mg化合物を元素換算で0.2〜2.5mol、
Mn化合物を元素換算で0.1〜1.0mol、
Zr化合物を元素換算で0.1〜2.0mol、
V化合物を元素換算で0.05〜0.3mol、
Si化合物を元素換算で0.2〜5.0molを含む積層セラミックコンデンサ。 - 前記Reは、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu、及びYからなる群から選ばれる少なくとも1種の希土類元素である、請求項1に記載の積層セラミックコンデンサ。
- 前記Reが複数あり、前記Reの平均イオン半径が0.894〜0.914Åである、請求項1または請求項2に記載の積層セラミックコンデンサ。
- 前記誘電体層に含まれるTiとZrの合計に対するBaとSrとCaの合計のモル比が、1.000〜1.030である請求項1から請求項3のうちいずれか1項に記載の積層セラミックコンデンサ。
- 請求項1から請求項4のうちいずれか1項に記載の積層セラミックコンデンサが平滑用コンデンサとして実装された回路基板。
- 平均粒径が150〜200nmであり、主成分が(Ba1−x1Cax1)m1TiO3(0.03≦x1≦0.16、0.99≦m1≦1.02)である粉末100molに対して、
Re酸化物(Reは希土類元素)を元素換算で1.0〜4.0mol、
Mg化合物を元素換算で0.2〜2.5mol、
Mn化合物を元素換算で0.1〜1.0mol、
M化合物(Mは、Ba、Ca、及びSrから選ばれる少なくとも1種の元素)を元素換算で0〜5.0mol、
Zr化合物を元素換算で0.1〜2.0mol、
V化合物を元素換算で0.05〜0.3mol、
Si化合物を元素換算で0.2〜5.0mol添加した原料を準備する工程と、
前記原料からグリーンシートを成形する工程と、
前記グリーンシートに内部電極層を印刷する工程と、
印刷後の前記グリーンシートを切断した後、その切断したグリーンシートを積層して積層物を得る工程と、
前記積層物をカットして積層体チップを得る工程と、
前記積層体チップを焼成する工程と、
前記積層体チップに、外部電極を形成する工程と、
を含む積層セラミックコンデンサの製造方法。 - 前記積層体チップを焼成する工程では、前記積層体チップを1000℃以上の温度で30〜300秒間焼成する、請求項6に記載の製造方法。
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