The 5 Secrets About Piezoelectric Ceramic Sensor Only A Handful Of People Know

Piezoelectric ceramics are widely used in the fields of electronics, light, heat and acoustics. They have become an important functional material in national defense industry, civil industry and daily life. They are one of the main research directions of current functional materials. Currently, the most piezo bimorph actuators is used piezoelectric ceramics are still lead zirconate titanate (PZT) and its ternary or quaternary ceramics. In the process of preparing piezoelectric ceramics, the polarization process is the key process. Polarization of hifu piezoelectric sensor is the process of movement and development of domain structures in piezoelectric ceramics. Piezoelectric ceramic is an isotropic body before artificial polarization, and does not show the piezoelectric effect to the outside. After polarization, ultrasonic atomizing piezoelectric becomes an anisotropic body due to the residual polarization, and thus has the piezoelectric effect. The piezoelectric, dielectric, and elastic properties of the polarized piezoelectric ceramic are related to the degree of polarization. To make the piezoelectric ceramic have a high degree of polarization, electrical piezo ceramics gives full play to its potential piezoelectric properties, we must use the best polarization conditions, that is, selecting the appropriate polarization electric field strength (E), polarization temperature (T) And polarization time (t) [2]. The three conditions of the polarization process are interdependent. If the polarization electric field is weak, it can be compensated by increasing the temperature and prolonging the polarization time. If the high power piezo ceramic of electric field is stronger and the temperature is higher, the polarization time can be shortened. However, the three conditions of polarization and piezoelectric ceramic components are closely related. For PZT piezoelectric ceramic material, to make its coercive field decrease, the traditional method is to adjust the ratio of zirconium to titanium, the larger the zirconium - titanium ratio, the smaller the coercive field, so that the polarization electric field is smaller. However, this simple method to improve the ratio of zirconium and titanium that does not significantly improve the polarization process conditions.