High-electromechanical-transformation multiphase piezoelectric ceramic material applied to energy collection device and preparation method

Abstract

The invention discloses a high-electromechanical-transformation multiphase piezoelectric ceramic material applied to an energy collection device and a preparation method and belongs to the field of piezoelectric ceramic materials. A matrix of the ceramic material is chemically composed of 0.2PZN-0.8PZT which is doped with Al2O3 of x vol. % in volume, wherein x ranges from 0.25 to 0.65. The preparation method includes: using ZnO, Nb2O5, Pb3O4, ZrO2 and TiO2 as raw materials to prepare 0.2PZN-0.8PZT; adding A12O3, and performing wet milling, drying, granulating, press-forming and sintering. A brand-new angle of view is provided for further developing high-performance piezoelectric energy collection materials, and the ceramic material is of great promoting significance in substantially improving electromechanical transformation performance of the energy collection device to enable the same to recycle waste vibration energy more effectively, to be more energy-saving, more environment-friendly and safer and to have more remarkable economic and social values.

Description

technical field [0001] The invention belongs to the field of piezoelectric ceramic materials, and in particular relates to a piezoelectric ceramic material with a 0-3 multiphase structure and a preparation method thereof, which can be applied to energy collection devices and has a high electromechanical conversion coefficient. Background technique [0002] Energy and the environment are two major themes that human beings are concerned about in the 21st century. In today's world where fossil energy is increasingly scarce, finding and developing sustainable green and environmentally friendly new energy and efficient collection has become one of the urgent tasks facing governments. As one of the main directions of new energy development, how to efficiently collect and convert waste energy in the environment into reusable electric energy has attracted much attention. Among them, piezoelectric energy harvesting devices are based on the positive piezoelectric effect of piezoelect...

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Problems solved by technology

However, the improvement of the conversion coefficient (d·g) in these works is very limited. The main reason is that the number of spontaneous polarizations at the MPB is large and the domain activity is high. Although it is beneficial to obtain the high-voltage strain constant d, the dielectric constant ε T also significantly increased

Although the material composition near the MPB is suitable for the use of electronic ceramic devices such as piezoelectric actuators and piezoelectric transducers, according to the d·g formula, it can be seen that the coexistence of high voltage and high dielectric properties is not conducive to the use of materials. The effective improvement of the conversion coefficient is difficult to meet the application requirements of high-performance piezoelectric energy harvesters

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