Developments of Piezoelectric Actuators by Using Environmentally Gentle Lead-Free Piezoelectric Ceramics

使用环保无铅压电陶瓷开发压电执行器

基本信息

批准号：
17360327
负责人：
TAKENAKA Tadashi
金额：
$ 9.92万
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：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

Recently lead-free piezoelectric materials are strongly demanded from the viewpoint of environmental protection by the registration such as the draft Directives on Waste form Electrical and Electronic Equipment (WEEE), Restriction of Hazardous Substances (RoHS) and End-of Life Vehicles (ELV) in EU. Candidate materials with the perovskite structure for lead-free piezoelectric ceramics in place of Pb-based Pb (Zr, Ti)O_3 (PZT) seem to be BaTiO_3 (BT), (Bi_<1/2>Na_<1/2>)TiO_3 (BNT), (Bi_<1/2>K_<1/2>)TiO_3 (BKT) and these solid solutions, and more KNbO_3 (KN)-based solid solutions etc. The desirable properties for piezoelectric actuators should show at least the piezoelectric strain constant, d_<33>>300 pC/N and the Curie temperature, Tc, or the depolarization temperature, T_d, >200℃. In this project, dielectric, ferroelectric and piezoelectric properties of grain-oriented and domain controlled textured ferroelectric ceramics with perovskite structures and bismuth layered-structures (BLSF) … More to apply to piezoelectric actuators and piezoelectric ceramic resonators.1. Grain oriented 0.9(Bi_<1/2>K_<1/2>)TiO_3-0.1BaTiO_3 (BKT-BT10) with perovskite structure was fabricated by a reactive template grain growth (RTGG) method using the template of Bi4Ti3O12. And more, multilayer type piezoelectric actuators using the textured composition were fabricated and the actuator properties were evaluated. The depolarization temperature, Td, of BKT-BT10 is higher than 250℃. The electric field induced strain, S, of textured and domain controlled BKT-BT10 is 1.5 times higher than that of non-oriented, and the dynamic piezoelectric strain constant, d33, is 168 pC/N. Textured and domain controlled this solid solution ceramics seem to be a superior candidate material for lead-free piezoelectric multilayer type ceramic actuators.2. Domain controlled bismuth layer-structured ferroelectric (BLSF) SrBi2Nb_<2-x>V_xO_9(SBNV-x) ceramics were fabricated by the hot-forging (HF) method. Temperature dependences in the various vibration modes of piezoelectric properties of SBNV-x were evaluated for ceramic resonator applications, especially, temperature coefficient of resonant and antiresonant frequencies (TC-f) were measured as a function of the crystal orientation axis. The TC-f was lowered in the a-b axis because of the origin of an anisotropy in BLSF. Electrical quality factor, Q_e, the mechanical quality factor, Q_m, and TC-f of grain-oriented (HF) SrBi_2Nb_<1.95>V_<0.05>O_9 (SBNV-0.05) were Q_c=66, Q_m=2200 and TC-f=16.5 ppm/℃ for (33)-mode, and Q_c=21.6, Q_m=4600 and TC- f=27.7 ppm/℃ for (15)-mode, respectively. These results indicate that grain oriented SBNV ceramics can be commercialized in the form of lead-free piezoelectric resonators. Less

最近，从环境保护的角度来看，近期无铅的压电材料是通过登记的角度来要求的，例如废物形式的电气和电子设备（WEEE），限制危险物质（ROHS）和欧盟中的危险物质（ROHS）和寿命终止工具（ELV）。具有钙钛矿结构的候选材料，用于无铅的压电陶瓷，代替基于PB的PB（ZR，TI）O_3（PZT），似乎是Batio_3（bt），（BI__ <1/2> Na____ <1/2>）Tio_3（bno_ <1/2>）Tio_3（bnt），（Bnt）基于KNBO_3（KN）的实心溶液等。压电执行器的理想特性至少应显示压电应变常数，D_ <33 >> 300 PC/N和Curie温度，TC或沉积温度，T_D，T_D，> 200℃。在这个项目中，具有谷物的纹理和纹理纹理的铁电陶瓷的顽固，铁电和压电特性，带有钙钛矿结构和二晶层结构（BLSF）…更多地适用于对压干电驱动器和压电陶瓷陶瓷共振剂。面向谷物的0.9（BI_ <1/2> K_ <1/2>）TIO_3-0.1BATIO_3（BKT-BT10）使用BI4TI3O12的模板通过一种反应性模板晶粒生长（RTGG）方法制造了具有perovskite结构的perovskite结构。而且，还制造了使用纹理组合物的多层压电执行器，并评估了执行器的性能。 BKT-BT10的沉积温度TD高于250℃。纹理和域控制的BKT-BT10的电场诱导应变S S比非方向高1.5倍，而动态压电应变常数D33为168 pc/n。纹理和域控制了这种实心溶液陶瓷似乎是无铅压电多层型陶瓷执行器的超级候选材料。2。域控制的二晶层结构化铁电（BLSF）srbi2nb_ <2-x> v_xo_9（sbnv-x）陶瓷是通过热孔（HF）方法制造的。评估了SBNV-X的压电特性的各种振动模式的温度依赖性，以用于陶瓷谐振器应用，特别是，谐振和抗抗性频率的温度系数（TC-F）的温度系数是根据晶体方向轴的函数测量的。由于BLSF中各向异性的起源，在A-B轴上降低了TC-F。电气质量因子，Q_E，机械质量因子，Q_M和TC-F的纹理（HF）SRBI_2NB_ <1.95> v_ <0.05> o_9（sbnv-0.05）均为q_c = 66，q_m = 2200 and tc-f = 2200 and tc-f = 16.5 ppm/ppm/q.6- Q_M = 4600和TC- F = 27.7 ppm/℃分别为（15）模板。这些结果表明，面向谷物的SBNV电疗疗法可以以无铅压电谐振器的形式进行商业化。较少的