JP2021080113A - セラミック原料粉末、誘電体グリーンシート、セラミック原料粉末の製造方法、およびセラミック電子部品の製造方法 - Google Patents
セラミック原料粉末、誘電体グリーンシート、セラミック原料粉末の製造方法、およびセラミック電子部品の製造方法 Download PDFInfo
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Abstract
Description
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1で例示するように、積層セラミックコンデンサ100は、略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、チタン酸バリウムは、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。
次に、得られたセラミック原料粉末に、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、基材上に誘電体グリーンシートを塗工して乾燥させる。なお、塩素含有量が不足する場合には、スラリに塩化アンモニウム、塩化バリウムなどの塩素化合物を混合することによって、塩素含有量を0.2atm%以上1.1atm%以下に調整してもよい。
このようにして得られた成型体を、250〜500℃のN2雰囲気中で脱バインダ処理した後に、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。
その後、N2ガス雰囲気中で600℃〜1000℃で再酸化処理を行う。この工程により、酸素欠陥濃度が減少する。
その後、外部電極20a,20bの下地層上に、めっき処理により、Cu,Ni,Sn等の金属コーティングを行う。以上の行程により、積層セラミックコンデンサ100が完成する。
塩素を含有する酸化チタン原料と塩素を含有する炭酸バリウム原料とを固相合成することで、不純物塩素を含むチタン酸バリウム粒子を合成した。実施例1では、チタン酸バリウム粒子の平均粒径が80nmであり、塩素含有量が0.2atm%であった。実施例2では、チタン酸バリウム粒子の平均粒径が80nmであり、塩素含有量が0.5atm%であった。実施例3では、チタン酸バリウム粒子の平均粒径が80nmであり、塩素含有量が1.1atm%であった。実施例4では、チタン酸バリウム粒子の平均粒径が100nmであり、塩素含有量が0.2atm%であった。実施例5では、チタン酸バリウム粒子の平均粒径が100nmであり、塩素含有量が0.5atm%であった。実施例6では、チタン酸バリウム粒子の平均粒径が100nmであり、塩素含有量が1.1atm%であった。実施例7では、チタン酸バリウム粒子の平均粒径が150nmであり、塩素含有量が0.2atm%であった。実施例8では、チタン酸バリウム粒子の平均粒径が150nmであり、塩素含有量が0.5atm%であった。実施例9では、チタン酸バリウム粒子の平均粒径が150nmであり、塩素含有量が1.1atm%であった。
11 誘電体層
12 内部電極層
13 カバー層
20a,20b 外部電極
100 積層セラミックコンデンサ
Claims (11)
- バリウムを含むペロブスカイト構造を有し、平均粒径が80nm以上150nm以下のセラミック粒子を備え、
前記セラミック粒子のBサイト元素に対する塩素の濃度が0.2atm%以上1.1atm%以下であることを特徴とするセラミック原料粉末。 - 前記セラミック粒子は、チタン酸バリウム粒子であることを特徴とする請求項1記載のセラミック原料粉末。
- 塩素化合物を含む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原料粉末。
- バリウムを含むペロブスカイト構造を有するセラミック粒子を合成し、前記セラミック粒子の平均粒径を80nm以上150nm以下とする工程を含み、
前記セラミック粒子を合成する際に、バリウム化合物原料と、前記セラミック粒子のBサイト元素の化合物原料とから前記セラミック粒子を合成し、
前記バリウム化合物原料および前記Bサイト元素の化合物原料の少なくともいずれか一方に塩素を含ませるか、合成後の前記セラミック粒子に塩素化合物を混合することで、前記Bサイト元素に対する塩素濃度が0.2atm%以上1.1atm%以下となるようにすることを特徴とするセラミック原料粉末の製造方法。 - 前記セラミック粒子は、チタン酸バリウム粒子であることを特徴とする請求項4記載のセラミック原料粉末の製造方法。
- バリウムを含むペロブスカイト構造を有し、平均粒径が80nm以上150nm以下のセラミック粒子を備え、
前記セラミック粒子のBサイト元素に対する塩素の濃度が0.2atm%以上1.1atm%以下であることを特徴とする誘電体グリーンシート。 - 前記セラミック粒子は、チタン酸バリウム粒子であることを特徴とする請求項6記載の誘電体グリーンシート。
- 塩素化合物を含むことを特徴とする請求項6または7に記載の誘電体グリーンシート。
- バリウムを含むペロブスカイト構造を有するセラミック粒子を含む誘電体グリーンシートと、内部電極形成用導電ペーストと、を交互に積層することで積層体を形成する工程と、
前記積層体を焼成する工程と、を含み、
前記誘電体グリーンシートにおいて、前記セラミック粒子の平均粒径は、80nm以上150nm以下であり、前記セラミック粒子のBサイト元素に対する塩素濃度が0.2atm%以上1.1atm%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。 - 前記誘電体グリーンシートは、塩素化合物を含むことを特徴とする請求項9記載のセラミック電子部品の製造方法。
- 前記セラミック粒子は、チタン酸バリウム粒子であることを特徴とする請求項9または10に記載のセラミック電子部品の製造方法。
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