Developments of Piezoelectric Actuators by Using Envirnmentally Gentle Lead-Free Piezoelectric

使用环保无铅压电材料开发压电执行器

• 批准号: 15360352
• 负责人: TAKENAKA Tadashi
• 金额: $ 9.86万
• 依托单位: TOKYO UNIVERSITY OF SCIENCE
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15360352/
• 关键词: Lead-Free Piezoelectrics; Lead-Free Ferroelectrics; Bismuth Sodium Titanate; Bismuth Potasium Titanate; Second Phase Transition Temperature; Lead-Free Piezoelectric Actuator; Piezoelectricity; Electromechanical Coupling Factor; 無鉛・非鉛圧電セラミックス; 強誘電; Lead-Free Piezoelectrics; Lead-Free Ferroelectrics; Bismuth Sodium Titanate; Bismuth Potasium Titanate; Second Phase Transition Temperature; Lead-Free Piezoelectric Actuator; Piezoelectricity; Electromechanical Coupling Factor; 無鉛・非鉛圧電セラミックス; 強誘電

Lead-free materials are recently demanded from the viewpoint of environmental protection. For example, the registration will be enforced in the EU as the draft Directives on Waste form Electrical and Electronic Equipment(WEEE), Restriction of Hazardous Substances(RoHS) and End-of Life Vehicles(ELV). Therefore, lead-free piezoelectric materials have been widely attracting attention as new materials in place of Pb-based Pb(Zr, Ti)O3 (PZT) ceramics. To replace PZT systems, it is necessary that required piezoelectric properties for various applications were divided and were developed the corresponding each application. For example, the perovskite type ceramics seem to be a suitable for actuators and high power applications. In this project, we try to develop piezoelectric actuators by using envirnmentally gentle lead-free piezoelectric ceramics. Candidate materials with the perovskite structure for lead-free piezoelectric ceramics are BaTiO3(BT), (Bi1/2Na1/2)TiO3(BNT), (Bi1/2K1/2)TiO3(BKT) … More and KNbO3(KN) etc. The desiable properties for piezoelectric actuators should show at least the piezoelectric strain constant, d33>300 pC/N and the Curie tempearature, Tc>200℃.Dielecric, ferroelectric and piezoelectric properties of a solid solution based on three components of BNT, BKT and BT, that is, x(Bi_<1/2>Na_<1/2>)TiO_3-y(Bi_<1/2>K_<1/2>)TiO_3-z BaTiO_3(x+y+z=1)[BNBKy:z(x)] are studied as a candidate for the actuator applications. BNT-based ferroelectrics usually have the second phase transition below 200℃ and show no piezoelectric activities above this temperature. In first year of this project, we had the best composition BNBK4:1(0.852) with d_<33>=190 pC/N and T_c=300℃ near the morphotropic phase boundary(MPB). However, the second phase transition temperature (T_2=120℃) is lower than that of our goal. In second year, we again tried to study the three component system. Finally the k_<33> and d_<33> are 0.474 and 140.2 pC/N for BNBK2:1(0.78) and more 0.462 and 127.9 pC/N for BNBK2:1(0.72), respectively. Temperature dependences of piezoelectric properties of the three-component solid solution ceramics display that piezoelectric activities keep up to higher than 200℃ with the higher second phase transition. This solid solution seems to be a superior candidate material for lead-free piezoelectric multilayer ceramic actuators. Less

从环境保护的角度来看，最近需要无铅材料。例如，欧盟将在欧盟执行注册，作为废物形式的电气和电子设备（WEEE），危险物质（ROHS）和寿命终止车辆（ELV）的限制。因此，随着新材料代替基于PB的PB（ZR，TI）O3（PZT）陶瓷，无铅压电材料已广泛引起人们的注意。为了替换PZT系统，有必要将所需的压电属性用于各种应用程序，并开发了相应的每个应用程序。例如，钙钛矿型陶瓷似乎适合执行器和高功率应用。在这个项目中，我们尝试通过使用环境温和的无铅压电陶瓷来开发压电执行器。具有无铅压电陶瓷的钙钛矿结构的候选材料为Batio3（BT），（BI1/2NA1/2）Tio3（BNT），（BI1/2K1/2）Tio3（BKT）…更多和KNBO3（knbo3（kn）等。以及curie Tempoarature，TC> 200℃。基于BNT，BKT和BT的三个组件，即固体解决方案的DieleCric，铁电和压电特性batio_3（x+y+z = 1）[bnbky：z（x）]作为执行器应用程序的候选者。基于BNT的铁电基通常的第二相跃迁低于200℃，并且在此温度以上没有压电活动。在这个项目的第一年中，我们拥有最好的组成BNBK4：1（0.852），D_ <33> = 190 pc/n和t_c = 300℃近形态相位边界（MPB）。但是，第二相跃迁温度（T_2 = 120℃）低于我们的目标。在第二年，我们再次尝试研究三个组件系统。最后，对于BNBK2：1（0.78），K_ <33>和D_ <33>分别为0.474和140.2 PC/N，而BNBK2：1（0.72）分别为0.462和127.9 PC/N。三组分固体溶液陶瓷的压电特性的温度依赖性显示，在高级第二相跃迁的情况下，压电活动的温度依赖性高达200℃。这种实心解决方案似乎是无铅压电多层陶瓷执行器的超级候选材料。较少的