学术报告

中国科学院上海硅酸盐研究所人工晶体中心

高负载下压电材料的表征方法---

国际标准 21819-2:2018(E)：电激励强振动瞬态响应测试方法

唐木智明（陈智明） 教授

日本富山县立大学

报告时间：2024年4月1日（星期一）上午10:00

地点：嘉定园区1号楼218会议室

联系人：罗豪甦（021-69987760）

欢迎科研人员和研究生参加！

Characteristic of piezoelectric properties under high-load conditions —

ISO 21819-2:2018(E): Electrical transient response method under high vibration levels

Prof. Taraki KARAKI (Zhiming CHEN)

Toyama Prefectural University, Japan

High power piezoelectric materials have a wide range of applications in piezoelectric actuators, piezoelectric linear stages, ultrasonic motors, ultrasonic welding, ultrasonic cleaning, piezoelectric transformers and other devices. Traditional piezoelectric characterization is based on the small-signal constant-voltage method, and the results of the test can be very different from the actual high-power use. The constant current method can test the piezoelectric properties under large loads, but the temperature of the sample rises continuously during the test, which affects the accuracy of the test. In 2016, Japanese scientists proposed a test method for the electrical transient response method under high vibration levels (Japanese Industrial Standard JIS R 1699-2: 2016), which can complete the measurement in less than 0.3 seconds, avoiding the temperature rise of the  sample,  and  can  accurately characterize the piezoelectric properties under large loads, providing an effective method for the research and development of high-power piezoelectric materials. The characterization method was designated as an international standard in 2018 (IOS 21819-2: 2018(E)).

This lecture gives an introduction for electrical transient response method under high vibration levels. Samples that have been stabilized for 48 hours after poling process, with approximately 35mm long, 4mm wide, and 0.5mm thick (top and bottom electrodes), could be used for the test. A 4-quadrant power supply is used to add approximately 100 V_p-p for 0.03 seconds and then the power is turned off. A current probe and a laser Doppler meter are applied to measure the change of current and displacement speedup to 0.1 seconds after the power is turned off. It is possible to calculate d₃₁*, Q_m* and the maximum stress at the center of the sample T_m* for different powers or vibration speeds, as well as the stored mechanical energy density P_m and the mechanical loss density (which corresponds to the heating power density) P_d.

This method is suitable for the characterization of transverse effect length vibration modes under a high power. For longitudinal effect length vibration modes, however, use of larger power supplies is required.

唐木（陈）智明，1982年2月毕业于上海科技大学获得学士学位，1985年2月获得中科院上海硅酸盐研究所硕士学位，1996年3月获得日本京都大学博士学位。1993年4月入职富山县立大学后，一直从事压电单晶，陶瓷和薄膜的制备及其应用研究，包括(i)弛豫铁电单晶交流极化(ACP)，(ii)无铅压电陶瓷制备，（iii)铁电压电单晶生长，(iv)声表面波器件模拟计算，(v)压电晶体用于声波器件的物理参数测试，等等。