What is piezoelectric ceramics?

Piezoelectric ceramics is a kind of information functional ceramic material piezoelectric effect, which can convert mechanical energy and electrical energy into each other. Piezoelectric ceramics not only have piezoelectric, but also have dielectric and elasticity. They have been widely used in medical imaging, acoustic sensors, acoustic transducers, ultrasonic motors and so on.

Piezoelectric ceramics are made by using the relative displacement of internal positive and negative charge centers caused by mechanical stress, resulting in binding charges with opposite symbols on the surfaces of both ends of the material, that is, piezoelectric effect. Piezoelectric ceramics are mainly used to manufacture ultrasonic transducers, underwater acoustic transducers, electroacoustic transducers, ceramic filters, ceramic transformers Ceramic frequency discriminators, high-voltage generators, infrared detectors, surface acoustic wave devices, electro-optic devices, ignition devices and piezoelectric gyroscopes are not only used in high-tech fields, but also serve people in daily life and strive to create a better life for people. Piezoelectric ceramics are a kind of electronic ceramic materials with piezoelectric properties The main difference from the typical piezoelectric quartz crystal without ferroelectric component is that the crystal phase of its main component is ferroelectric grain Because ceramics are polycrystalline aggregates with random grain orientation, the spontaneous polarization vector of each ferroelectric grain is also disorderly oriented In order to make the ceramics show macroscopic piezoelectric characteristics, it is necessary to polarize the piezoelectric ceramic tube after they are fired and the end face is re electrode, so as to make the original chaotic orientation of their polarization vectors preferentially oriented along the direction of the electric field After polarization treatment, the piezoelectric ceramics will retain a certain macro residual polarization intensity after the electric field is cancelled, so that the ceramics have a certain piezoelectric property.