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The production flow charge of Piezo Ceramic elements

2019-01-29


The production flow charge of Piezo Ceramic Elements


The flow chart of the process is as follows: batching - mixed grinding - pre-firing - secondary grinding - granulation - forming - removing - sintering - Ceramic - shape processing - electrode - high voltage polarization - aging test.


1. Ingredients: Pre-treatment, impurities removal and moisture removal, and then weigh various raw materials according to the proportion of the formula, pay attention to a small amount of additives to be placed in the middle of the bulk.

2. Mixed grinding: The purpose is to grind all kinds of raw materials evenly and prepare conditions for complete solid-state reaction of pre-burning. Dry grinding or wet grinding are generally adopted. Dry grinding can be used in small batches, and stirring ball milling or airflow grinding can be used in large batches with high efficiency.

3. Pre-firing: The aim is to synthesize piezoelectric ceramics by solid-state reaction of raw materials at high temperature. This process is very important. It will directly affect the sintering conditions and the performance of the final product.

Fourth, secondary fine grinding: The purpose is to fine the pre-fired Piezoelectric ceramic powder by vibration and mixing, laying a good foundation for uniform performance of the ceramics.

5. Granulation: The purpose is to form high-density particles with good fluidity. The method can be carried out manually, but the efficiency is low. The efficient method is spray granulation. Adhesive is added to the process.

6. Forming: The purpose is to press the granulated material into the required prefabricated blank size.

Placement: The purpose is to remove the binder from the blank when granulating.

8. Sintering into Porcelain: The blank is sealed and sintered into Porcelain at high temperature. This link is very important.

9. Shape processing: grinding the burned products to the required size of finished products.

10. Subject electrodes: Conductive electrodes are arranged on the required ceramic surfaces. The general methods include silver burning, chemical deposition and vacuum coating.

11. High voltage polarization: the domains in the ceramics are aligned in orientation, so that the ceramics have piezoelectric properties.

12. Aging test: After the ceramic performance is stable, test the various indicators to see whether the expected performance requirements have been met.

The manufacturing characteristic of piezoelectric ceramics is to polarize the ferroelectric ceramics under DC electric field to make them have piezoelectric effect. Generally, the polarization electric field is 3-5 kV/mm, the temperature is 100-150 degrees C, and the time is 5-20 minutes. These three factors are the main factors affecting the polarization effect. The electromechanical coupling coefficient of piezoelectric ceramics with good properties, such as lead zirconate titanate ceramics, can be as high as 0.313-0.694.


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