SU942242A1 - Method of manufacturing piezoceramic transducer - Google Patents

Description

(54) METHOD OF MANUFACTURING PIEOECERAMIC CONVERTERS

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Invented in relation to the technology and can be used in connection with the tipoesee of piezherzhem transformers and apyrvx. transducers based on piezsceramics, in which there are sections with different polarization directions.

A known method of making piezsheric elements having sections with different polarization directions, for example, piezoceramic transformers, including the manufacture of ferro. ceramic plate, applying two electrodes on the half of the large faces and the third electrode on the opposite end of the plate, half the thickness of the first boot of fault in thickness, d of the second plate along the length tl 1

The disadvantage of this method is the complexity of the BI process using other configurations, for example, cylindrical.

The closest to the pre-opable is a method for producing piezoceramic transducers in hollow cylinders.

which includes a cylindrical billet, drawing the electrodes on the ends of the cylinder and its external center line. surfaces, polarization of the outer surface sections, polarization of the blank sections in opposite directions with the boundary of areas of differently directed polarization

However, the resulting boundary of sections with different polarization directions causes internal stress in the piezhering elements, leading to a decrease in their mechanical strength and a decrease in the yield of the piezoelectric elements during polarization due to mechanical damage.

The purpose of the invention is to increase the mechanical strength, reliability and increase the yield of products.

Claims (2)

The goal is achieved by the fact that in the method of producing piezoceramic transducers, including making piezoceramic billets, applying main electrodes and 04 prizazigo in various directions next to the located sections, an additional electrode is placed on the workpiece between the sections a distance of 0.5–1.5 thickness of the workpiece from the main electrode located in this area, and the electric field is applied in the same section between the main electrodes during the field operation And in the other sections - between the main and auxiliary electrodes, so that the transition region between the sections is not subjected to the electric field. Formation of sections on the border with different polarization directions of the transition region, which is not polarized or polarized to a small extent, reduces the internal mechanical stresses and increases the mechanical strength of the piezoceramic converter. Example. Conduit manufacturing piezoceramic transformers. A batch of piezoceramic blanks with dimensions 7O 15 1 mm is divided into two groups. Piezo-ceramic transformers are manufactured from the first group of blanks according to a known method (Fig. 1) i. The second group of blanks made by the proposed method. At a distance of 1.5 mm from the electrodes 1 of the input section, an additional annular electrode 2 is applied. When the input section is polarized, an electric field is applied between the electrodes of the 1 input section. During the polarization of the output section, an electric field is applied between the electrode 3 of the output section and the additional electrode 2 (Fig. 2). For these groups of transformers, the electrophysical characteristics and tensile strength are determined by the three-point bend method. Transformers manufactured by the proposed method have a one-third tensile strength than the transformers made by a known method. Using the proposed method of manufacturing transducers for cases where they have adjacent sections polarized in different directions, provides: Obtaining piezoceramic transducers with strength characteristics} reducing rejects due to polarization due to destruction along the borders of sections with different field directions that increases the yield of products in their manufacture reliability and durability during operation. The invention The method of manufacturing piezoceramic transducers, including the manufacture of piezoceramic blanks, the application of the main electrodes and polarization in various directions of a number of spaced sections, is so that, in order to determine the mechanical strength, reliability and increase the yield of izpeliya, an additional electrologic located in the transitional area between the sections at a distance O, 51, 5 mm of the thickness of the blank from the main electrode, located in this region, is applied to the workpiece. At this, an electric field is applied during polarization in one section between the main electrodes, and in the other section - between the main and secondary electrodes so that the transition region between the sections is not exposed to an electric field. Sources of information taken into account in the examination: 1. Smazhevska EG, Feldman NB Piezoceramic ceramics. Soviet radio, 1971. 2. GlazmaI I.A. Piezoceramics. Energy, 1972, p. 33 - 86 (prototype) /   {f f IS Fig f AND /; 1.5 15 / 3 7 7O Phage. 2