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Piezoelectric Ceramics The Details Of The Introduction

Sinocera Piezotronics, INC | Updated: May 26, 2017

  Piezoelectric Ceramics Piezoelectric ceramics is a kind of information function ceramic material capable of converting mechanical energy and electric energy from each other. Piezoelectric effect is besides piezoelectricity, but also has dielectric property and elasticity. It has been widely used in medical imaging, Acoustic sensors, acoustic transducers, ultrasonic motors, and the like. Piezoelectric ceramics with its material under the action of mechanical stress, caused by the relative positive and negative charge center displacement and polarization occurs, leading to the surface of the material at both ends of the opposite sign of the contraction of the charge that is produced by the piezoelectric effect, with sensitive characteristics, Ceramics are mainly used in the manufacture of ultrasonic transducers, underwater acoustic transducers, electroacoustic transducers, ceramic filters, ceramic transformers, ceramic discriminators, high voltage generators, infrared detectors, surface acoustic wave devices, electro-optical devices, Ignited detonation devices and piezoelectric gyroscopes, in addition to the field for high-tech, it is more in daily life for people to serve, for people to create a better life and work.

  Piezoelectric Ceramics Piezoelectric ceramics are a kind of electronic ceramic materials with piezoelectric properties, and the main difference with the typical piezoelectric quartz crystals which do not contain ferroelectric components is that the crystal phases constituting the main components are ferritic grains. Since the ceramics are randomly oriented polycrystal aggregates, the spontaneous polarization vectors of the individual ferroelectric grains are also chaotic. In order for the ceramics to exhibit macroscopic piezoelectric properties, it is necessary to burn the piezoelectric ceramics And after the end face is replaced by the electrode, it is placed in the strong DC electric field under the polarization treatment, so that the original chaotic orientation of the respective polarization vector in the direction of the electric field preferred orientation after the polarization of the piezoelectric ceramic, in the electric field After the abolition, will retain a certain degree of macroscopic residual polarization, so that the ceramic has a certain piezoelectric properties.

  Piezoelectric Ceramics Commonly used piezoelectric ceramics are barium titanate, lead zirconate titanate binary system and in the binary system to add a third ABO3 (A said divalent metal ions, B said tetravalent metal ions or several ions in the sum of four (Mn1 / 3Nb2 / 3) O3 and Pb (Co1 / 3Nb2 / 3) O3 and other ternary systems. If a third or more compound is added to the ternary system, a quaternary or multicomponent piezoelectric ceramic may be formed. In addition, there is a partial niobate-based piezoelectric ceramics such as sodium niobate (Na0.5 · K0.5 · NbO3) and barium strontium niobate (Bax · Sr1-x · Nb2O5). Containing toxic lead, beneficial to environmental protection.