Understanding The Background Of Piezoelectric Ceramic Sensor

Domestic and foreign research on the low temperature sintering energy harvesting plate of piezoelectric ceramics have the following conclusions: (1) the formation of solid solution to reduce the sintering temperature of piezo expansion sensor, ion displacement to be carried out under certain conditions and the structural defects are limited, so the cooling rate is not large about 200°C. (2) The effect of reducing the sintering temperature of piezoelectric sensor circuit by forming the liquid phase is obvious, but the liquid phase product remains in the ceramic microstructure. The presence of such a low-melting point product causes the mechanical strength, dielectric properties and piezo discs wire leadpiezoelectricity of the material (3) The sintering temperature when using chemical synthesis method is still above 1 000 °C. In addition, due to the different compounding ability of various metal ions in solution, compound separation of piezoelectric cylinder may occur during the dehydration or calcination process.About other compounds, we can see that not all the raw materials can be prepared by chemical synthesis. (4) hot pressing sintering process of ultrasonic air transducer will produce grain orientation, so that the piezoelectric properties of the direction of the porcelain body in the mold cooling is to produce greater internal stress , Affecting the piezoelectric properties, and the sintering temperature can not drop too low. (5) The use of low melting point additive "double effect" piezoelectric sensor crystal can significantly reduce the sintering temperature while increasing the material Piezoelectric performance, and low cost, simple process, is a way to implement low-temperature that is sintering a piezoelectric ceramic is preferable.