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Piezoelectric ceramic is a kind of electronic ceramic material with piezoelectric properties. The main component of piezoelectric ceramics is ferroelectric grains. After polarization treatment by strong DC electric field, the polarization vectors of the original chaotic orientation of ferroelectric grains are preferentially oriented along the electric field direction. After polarization treatment, the piezoelectric ceramics will retain a certain macroscopic residual polarization intensity after the electric field is cancelled, thus having certain piezoelectric properties.
Figure 1.Piezoelectric Demonstrator (Spark produced from Piezoelectric)
Generally speaking, piezoelectric property is the property that can convert mechanical energy and electrical energy into each other. It is a positive piezoelectric effect to deform the medium through the action of force, thus causing the surface of the medium to be charged. On the contrary, if a certain exciting electric field is applied to the medium, the medium will produce mechanical deformation, which is called inverse piezoelectric effect. The piezoelectric effect of piezoelectric ceramics has been applied by scientists in various fields closely related to human life to realize the functions of energy conversion, sensing, driving and frequency control. Using the positive piezoelectric effect of piezoelectric ceramics, piezoelectric lighters, bomb detonators, etc. can be made. For example, the common electronic lighters in life use the property that piezoelectric ceramics convert mechanical energy into electrical energy. Moreover, due to the sensitive characteristics of piezoelectric ceramics, extremely weak mechanical vibration can be converted into electrical signals, which can be used in sonar, meteorological detection, telemetry environmental protection and other fields. When piezoelectric ceramics are used to make piezoelectric seismographs, the intensity of earthquakes can be accurately measured and the location and distance of earthquakes can be indicated. Piezoelectric ceramics not only have unique piezoelectric properties, but also show the advantages of good frequency stability, high precision, high anti-interference and wide applicable frequency range when applied to frequency control devices such as resonators and filters.
Piezoelectric ceramics are widely used, one of the application is ultrasonic transducers. Ultrasonic transducer is a device that uses the inverse piezoelectric effect of piezoelectric ceramics to convert the input high-frequency electric power into mechanical power (ultrasonic) and transmit the mechanical power. Its core element is piezoelectric ceramics, which can adapt to different working forms and frequency requirements of different ultrasonic transducers by changing the shape and specifications of piezoelectric ceramics.
Figure 2. The piezoelectric ceramics dics produced by Siansonic Technology
Siansonic has nearly 40 years' experience in the production and R&D of piezoelectric ceramics, providing customers with piezoelectric ceramic elements with different shapes, sizes and electrode materials. Various complex electrode patterns can be customized according to their needs.