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PIEZOELECTRIC CERAMIC, PIEZOELECTRIC CERAMIC ELECTRONIC PART, AND METHOD FOR MANUFACTURING PIEZOELECTRIC CERAMIC
PROBLEM TO BE SOLVED: To realize: a piezoelectric ceramic having a good power efficiency and capable of suppressing the heat generation in high-electric field activation; various piezoelectric ceramic electronic parts arranged by use of the piezoelectric ceramic, which are suitable for high-power devices including a piezoelectric transformer and a piezoelectric actuator; and a method for manufacturing the piezoelectric ceramic.SOLUTION: A piezoelectric ceramic comprises a PZT-based perovskite compound. In the piezoelectric ceramic, a crystal grain 2 is subjected to region division into domains 36 by domain walls 33; the crystal grain 2 has a specific domain size L; and there are crystal grains of 100 nm or less in the domain size L at an area ratio of 30% or more. A method for manufacturing the piezoelectric ceramic comprises a sintering step which includes sintering a ceramic compact at a first predetermined temperature for a short time and then, sintering it at a second predetermined temperature lower than the first predetermined temperature for a long time so that crystal grains having a domain size of 100 nm or less account for 30% or more in area ratio after polarization processing.SELECTED DRAWING: Figure 1
【課題】高電界駆動時の発熱を抑制することができ、電力効率が良好な圧電セラミック、この圧電セラミックを使用した圧電トランスや圧電アクチュエータ等のハイパワーデバイスに適した各種圧電セラミック電子部品、及び上記圧電セラミックの製造方法を実現する。【解決手段】ＰＺＴ系のペロブスカイト型化合物を含有し、結晶粒子２が、ドメインウォール３３によって複数のドメイン３６に領域分割されると共に、結晶粒子２は、固有のドメインサイズＬを有し、ドメインサイズＬが１００ｎｍ以下の結晶粒子が、面積比率で３０％以上存在する。焼成工程は、分極処理後において１００ｎｍ以下のドメインサイズを有する結晶粒子が面積比率で３０％以上となるように、第１の所定温度で短時間焼成した後、第１の所定温度より低い第２の所定温度で長時間焼成する。【選択図】図１
PIEZOELECTRIC CERAMIC, PIEZOELECTRIC CERAMIC ELECTRONIC PART, AND METHOD FOR MANUFACTURING PIEZOELECTRIC CERAMIC
PROBLEM TO BE SOLVED: To realize: a piezoelectric ceramic having a good power efficiency and capable of suppressing the heat generation in high-electric field activation; various piezoelectric ceramic electronic parts arranged by use of the piezoelectric ceramic, which are suitable for high-power devices including a piezoelectric transformer and a piezoelectric actuator; and a method for manufacturing the piezoelectric ceramic.SOLUTION: A piezoelectric ceramic comprises a PZT-based perovskite compound. In the piezoelectric ceramic, a crystal grain 2 is subjected to region division into domains 36 by domain walls 33; the crystal grain 2 has a specific domain size L; and there are crystal grains of 100 nm or less in the domain size L at an area ratio of 30% or more. A method for manufacturing the piezoelectric ceramic comprises a sintering step which includes sintering a ceramic compact at a first predetermined temperature for a short time and then, sintering it at a second predetermined temperature lower than the first predetermined temperature for a long time so that crystal grains having a domain size of 100 nm or less account for 30% or more in area ratio after polarization processing.SELECTED DRAWING: Figure 1
【課題】高電界駆動時の発熱を抑制することができ、電力効率が良好な圧電セラミック、この圧電セラミックを使用した圧電トランスや圧電アクチュエータ等のハイパワーデバイスに適した各種圧電セラミック電子部品、及び上記圧電セラミックの製造方法を実現する。【解決手段】ＰＺＴ系のペロブスカイト型化合物を含有し、結晶粒子２が、ドメインウォール３３によって複数のドメイン３６に領域分割されると共に、結晶粒子２は、固有のドメインサイズＬを有し、ドメインサイズＬが１００ｎｍ以下の結晶粒子が、面積比率で３０％以上存在する。焼成工程は、分極処理後において１００ｎｍ以下のドメインサイズを有する結晶粒子が面積比率で３０％以上となるように、第１の所定温度で短時間焼成した後、第１の所定温度より低い第２の所定温度で長時間焼成する。【選択図】図１
PIEZOELECTRIC CERAMIC, PIEZOELECTRIC CERAMIC ELECTRONIC PART, AND METHOD FOR MANUFACTURING PIEZOELECTRIC CERAMIC
圧電セラミック、圧電セラミック電子部品、及び圧電セラミックの製造方法
KURODA DAISUKE (author)
2017-05-25
Patent
Electronic Resource
Japanese
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