Views: 19 Author: Site Editor Publish Time: 2018-09-17 Origin: Site
The technological process of piezoelectric ceramic is as follows: Ingredients - mixing and grinding - pre-sintering - secondary grinding - granulation - molding - plasticizing - sintering into porcelain - shape processing - being electrode - high pressure polarization --Aging test.
1. the ingredients: pre-treatment, which removes the impurities, and then weigh the various raw materials according to the proportion of the formula, paying attention to a small amount of additives should be placed in the middle of the bulk.
3. Pre-burning: The purpose is to conduct solid-phase reaction of various raw materials at high temperature to synthesize piezoelectric ceramics. This process is very important. Which directly affect the sintering conditions and the performance of the final product.
4. the second fine grinding: the purpose is to re-sinter the pre-fired piezoelectric ceramic powder and finely grind it to lay a good foundation for the uniform performance of the porcelain.
11. High voltage polarization: The piezo ceramic domains are aligned, so that the ceramic has piezoelectric properties.
12. Aging test: After the performance of piezoceramic element vibrator sensor is stable, the indicators are tested to see if the expected performance requirements are met. Piezoelectric ceramics are characterized by polarization treatment of ferroelectric ceramics under a direct current electric field to have a piezoelectric effect. Generally, the polarization electric field is 3 to 5 kV/mm, the temperature is 100 to 150 ° C, and the time is 5 to 20 min. These three are the main factors affecting the polarization effect. Piezoelectric element ceramic transducer with better performance, such as lead zirconate titanate ceramics can have an electromechanical coupling coefficient about 0.313 to 0.694.
