Polarization Temperature Effect on Structure and Properties of Piezoelectric Ceramics

Polarization is an important part of the performance of piezoelectric ceramics. Piezoelectric ceramic materials can only exert their potential piezoelectric properties  after polarization, which become piezoelectric elements to realize their value. Paying attention to the following points in the polarization process:

Before polarization, first check whether there is silver in the thickness direction of the front and back of the piezoelectric disk vibration sensor by eyes, and then use a multimeter to further test whether silver is connected between the partitions of the sample to avoid the breakdown due to external factors by the polarization of the sample; Replacing the insulating oil to ensure the cleanliness of the oil bath, insulating oil, and polarization fixtures. Mark positive and negative pencils on the surface of piezoceramic tube sensor to be polarized. Controlling the oil temperature to raise it to the required polarization temperature.

During the polarization process, the abnormality of the sample should be recorded. The polarization phenomena of different materials PZT material piezoelectrc sensor with different sizes will be different. Combining with the specific problems existing in the previous series of processes, the reasons will be improved to improve the polarization yield. After the end of the polarization, carefully which wipe off the silicone oil on the surface of the sample with kerosene, it clean the sample and wipe it clean with a cotton swab. After testing the data, wraping it in a capacitor paper and placing it in a P4 material piezo ring to prevent oxidation. In this paper, the oil-immersed polarization is adopted, and the polarization medium is selected from ethyl silicone oil which is resistant to high temperature and high pressure, and the accuracy of temperature is under the control of oil bath is ±O. 5°C. Will the burn silver samples P-41 and PMnS material. PZT piezoelectric ceramics were placed in an oil bath and preheated for 10 min. Polarization was performed under the different polarization conditions. After the polarization was completed, the properties of 32Khz pzt piezo rings were measured in an oven at 60°C.The two systems were investigated.by good polarization conditions.

It changes in the electric field under the action of a strong DC electric field, the material arranges disorderly domains in the direction of the electric field in an orderly manner. After the electric field is removed, the electric domains in the material still retain the preferred orientation along the direction of the electric field. Then, the isotropic polycrystals of piezoelectric ring sensor become anisotropic polycrystals, which is making the piezo ceramic material . It can be seen from the figure that it is at a certain polarization temperature, as the polarization voltage increasing, the piezoelectric ceramic increases first and then decreases, and the germanium and selenium first decreases and then increases.