Views: 13 Author: Site Editor Publish Time: 2019-12-13 Origin: Site
The manufacturing process of piezoelectric ceramic sheet: batching-mixed grinding-pre-firing-secondary grinding-granulation-molding-rowing-sintering into porcelain-shape processing-to be electrode- -High voltage polarization-aging test.
The following describes the specific issues of the next 12 process links
1. Ingredients: carry out pre-treatment of Pzt ceramic powder, remove impurities and damp, and then weigh various raw materials according to the formula ratio. Note that a small amount of additives should be placed in the middle of the large ingredients.
2. Mixing and grinding: The purpose is to mix and grind all kinds of raw piezo ceramic material to prepare conditions for complete solid-phase reaction for pre-firing. Generally, dry grinding or wet grinding is adopted. Small batches can adopt dry milling, and large batches can adopt stirring ball milling or jet milling, which has higher efficiency.
3. Pre-firing: The objective is to synthesize piezoelectric ceramics at high temperature by solid-phase reaction. This process is very important. Will directly affect the sintering conditions and performance of the final product.
4. Secondary fine grinding: The purpose is to finely vibrate the pre-fired piezoelectric ceramic powder and mix it finely, so as to lay a solid foundation for the uniform performance of porcelain.
5. Granulation: The purpose is to make the powder into high-density and fluid particles.
6. Forming: The purpose is to compact the granulated material into a blank of the required prefabricated size.
7. Plastic discharge: the purpose is to remove the binder added during granulation from the blank.
8. Sintering into porcelain: The blank is sealed and sintered into porcelain at high temperature. This session is quite important.
9, shape processing: grinding burned products to the required size of the finished product.
10. To be electrode: a conductive electrode is provided on the surface of the required ceramic transducer. The general methods are infiltration of silver layer, chemical deposition and vacuum coating.
11. High-voltage polarization: Orientation of the electric domains in the piezo ceramic, so that the piezo ceramic has piezoelectric properties.
12. Aging test: After the performance of piezo ceramic is stable, checking all indicators to see if it meets the expected performance requirements.
A piezo disc transducer is an electronic sounding element. A piezoelectric ceramic dielectric material is placed between two copper circular electrodes. When an AC audio signal is connected to the two electrodes, the piezoelectric piece will When a vibration occurs, a corresponding sound comes. Because of its simple structure and low cost, piezoelectric ceramics are widely used in electronic appliances such as toys, sounding electronic watches, electronic instruments, electronic clocks, timers and so on.
