JP5967532B2 - 圧電セラミックス - Google Patents
圧電セラミックス Download PDFInfo
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- JP5967532B2 JP5967532B2 JP2012165530A JP2012165530A JP5967532B2 JP 5967532 B2 JP5967532 B2 JP 5967532B2 JP 2012165530 A JP2012165530 A JP 2012165530A JP 2012165530 A JP2012165530 A JP 2012165530A JP 5967532 B2 JP5967532 B2 JP 5967532B2
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Description
しかし、機械的品質係数Qmが小さくソフトな圧電セラミックスが求められる分野もある。例えば、圧電セラミックスを、インクジェットプリンターの圧電アクチュエータに応用する場合、低い機械的品質係数Qmを示す圧電セラミックスを利用したほうが、より大きな変位特性をもつ圧電アクチュエータを実現できるとともに、加工が容易であるというメリットもある。
本発明は、以上に鑑み、短時間での焼結が可能でありながら、低い機械的品質係数を示す、非鉛系の圧電セラミックスを提供することを課題とする。
本発明に係る圧電セラミックスは、組成式(KxNa1−x)y(Nb1−zTaz)O3で表される非化学量論組成ペロブスカイト化合物を主成分とした非鉛系の圧電セラミックスであり、この主成分に対し、焼結助剤として、少なくとも、K、Co、及びTaを含む酸化物を含んでなるものである。
しかし一例を挙げると、前記酸化物の配合割合は、前記非化学量論組成ペロブスカイト化合物のモル数と当該酸化物のモル数(Co原子を基準としたモル数)との合計を100モル%とした時に、Coの割合が約0.1%を超え2.0モル%未満程度になるような量であることが好ましい。より好ましくは約0.3モル%以上1.0モル%以下である。前記酸化物の配合割合が少なすぎると、焼結助剤としての役割を発揮できず、短時間での焼結が不可能となる恐れがあり、逆に、前記酸化物の配合割合が多すぎると、主成分たる非化学量論組成ペロブスカイト化合物が発揮する圧電特性を阻害する恐れがある。このような観点から、実験により、適切な配合割合を決定することができる。
次に、本発明に係る圧電セラミックスの製造方法について説明する。
本発明の圧電セラミックスは、用途に応じた種々の形態を成すものであり、その寸法および形状は特に限定されない。形状としては、例えば、円板状、角柱状や矩形板状等が挙げられる。
原料としてKHCO3、NaHCO3、CoO及びTa2O5を使用し、上述した手順で仮焼を行い、表1に掲載した組成式を持つ酸化物を得た。なお、この酸化物は、単一の化合物ではなく、KTaO3、K2Ta4O11、Ta2O5、CoTa2O9などの混合物であり、混合物全体として表1に掲載した組成式を持つ。すなわち、この組成は混合物全体における平均組成である。次いで、この酸化物と、(K0.5Na0.5)(Nb0.7Ta0.3)O3(以下、略してKNNTともいう)を湿式混合した後に、乾燥及び分級処理を行った。CIPにより成形を行った後、空気中1050℃〜1200℃の範囲で1時間の焼結を行い、圧電セラミックスを得た。
なお、KNNTと上記酸化物の割合は、99.5KNNT:0.5(1/h(KgCohTaiOj)となるように、すなわちKNNTと上記酸化物中のCoの合計モル数を100モル%とした場合にCo量が0.5モル%となるように設定した。ただし、Coを含まない酸化物を用いた比較例6では、99.5KNNT:0.5K2Ta8O21となるように設定した。
実施例3で酸化物0.5モル%とKNNT99.5%を湿式混合する際に、さらに、ZnO 0.5モル%、LaMnO3 0.2モル%、Mn3O4 1.2モル%(Mn基準)、CaTiO3 1.5モル%も添加して湿式混合を行った。その他は上記と同様に成形及び焼結を行い、圧電セラミックスを得た。得られた圧電セラミックスについて、上記と同様に電気特定及び圧電定数を評価した。その結果を表2に示す。
実施例1−4で、CoOの代わりにFeOを使用し、仮焼を経て、K4FeTa8O23で表される酸化物を得た。次いで、この酸化物とKNNTを、KNNTと酸化物中のFeの合計モル数を100モル%とした場合にFe量が0.5モル%となるような割合で湿式混合した後、上記と同様に成形及び焼結を行い、圧電セラミックスを得た。得られた圧電セラミックスについて、上記と同様に電気特定及び圧電定数を評価した。その結果を表2に示す。
実施例6−9及び比較例8−9では、実施例2と同じ酸化物を使用して圧電セラミックスを製造した。ただし、KNNTと上記酸化物の割合を実施例2とは異なるように設定した。上記割合を、表3に示す。表3中のCo量は、KNNTと酸化物中のCoの合計モル数を100モル%とした場合のCo割合(モル%)を意味する。その他は、実施例1−4と同様の手順で圧電セラミックスを得、得られた圧電セラミックスについて、上記と同様に電気特定及び圧電定数を評価した。その結果を表3に示す。なお、表3では、参考のため、実施例2についても掲載している。
Claims (2)
- 組成式(KxNa1−x)y(Nb1−zTaz)O3(式中、0<x≦1、0.9≦y<1、0≦z≦0.5)で表される非化学量論組成ペロブスカイト化合物、並びに、
K、Co、及びTaを含む酸化物からなる焼結助剤であって、K、Co、及びTaの合計モル数に対するKのモル比率が4/13以下、Coのモル比率が1/2以下、及び、Taのモル比率が3/10以上である焼結助剤、
を含有し、
前記酸化物の配合割合は、前記非化学量論組成ペロブスカイト化合物のモル数と前記酸化物のモル数(Co原子を基準としたモル数)との合計を100モル%とした時に、Coの割合が0.1%を超え2.0モル%未満になる量である、圧電セラミックス。 - 前記焼結助剤において、K、Co、及びTaの合計モル数に対するCoのモル比率が3/10以下である、請求項1に記載の圧電セラミックス。
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JP2012165530A JP5967532B2 (ja) | 2012-07-26 | 2012-07-26 | 圧電セラミックス |
US13/926,347 US9647197B2 (en) | 2012-07-26 | 2013-06-25 | Piezoelectric ceramics and method for manufacturing the same |
EP13177276.6A EP2690680B1 (en) | 2012-07-26 | 2013-07-19 | Piezoelectric ceramics and method for manufacturing the same |
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JP5967532B2 true JP5967532B2 (ja) | 2016-08-10 |
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JP6327914B2 (ja) * | 2014-04-11 | 2018-05-23 | 日本特殊陶業株式会社 | 無鉛圧電磁器組成物、それを用いた圧電素子、及び、無鉛圧電磁器組成物の製造方法 |
JP5823014B2 (ja) * | 2014-04-11 | 2015-11-25 | 日本特殊陶業株式会社 | 無鉛圧電磁器組成物、それを用いた圧電素子、及び、無鉛圧電磁器組成物の製造方法 |
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JP4398635B2 (ja) * | 2002-09-24 | 2010-01-13 | 株式会社ノリタケカンパニーリミテド | 圧電セラミックス |
JP4995412B2 (ja) * | 2003-05-29 | 2012-08-08 | 日本特殊陶業株式会社 | 圧電磁器組成物及びこれを用いた圧電素子 |
JP4926389B2 (ja) * | 2004-06-17 | 2012-05-09 | 株式会社豊田中央研究所 | 結晶配向セラミックス、及びその製造方法 |
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JP5281786B2 (ja) * | 2007-11-14 | 2013-09-04 | 日本碍子株式会社 | (Li,Na,K)(Nb,Ta)O3系圧電材料、及びその製造方法 |
US8282854B2 (en) * | 2008-01-08 | 2012-10-09 | Ngk Insulators, Ltd. | (Li, Na, K)(Nb, Ta, Sb)O3 based piezoelectric material and manufacturing method thereof |
EP2423993B1 (en) * | 2009-04-24 | 2015-08-12 | NGK Insulators, Ltd. | Manufacturing method for thin board-shaped fired piezoelectric body |
JP2011088786A (ja) * | 2009-10-22 | 2011-05-06 | Nagoya Univ | 圧電セラミックス |
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EP2690680B1 (en) | 2016-12-21 |
US20140027666A1 (en) | 2014-01-30 |
EP2690680A3 (en) | 2015-11-11 |
EP2690680A2 (en) | 2014-01-29 |
JP2014024698A (ja) | 2014-02-06 |
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