A kind of preparation method of piezoelectric composite material and piezoelectric composite material

Abstract

The present application discloses a method for preparing a piezoelectric composite material, which includes the following steps: cutting out a first piezoelectric material skeleton and a second piezoelectric material skeleton with a height smaller than the thickness of the piezoelectric material from the upper and lower surfaces of the piezoelectric material along the thickness direction. Piezoelectric material skeletons, wherein the first cutting grooves distributed between the first piezoelectric material skeletons and the second cutting grooves distributed between the second piezoelectric material skeletons intersect and are staggered; the flexible polymer Pouring into the first cutting groove and the second cutting groove respectively, and solidifying to form a piezoelectric composite material; removing the first cutting groove and the piezoelectric composite material from the upper and lower surfaces of the piezoelectric composite material respectively The unintersecting portion of the second cut groove. By applying the method, repeated cutting of the skeleton can be avoided, the risk of crystal column collapse and fracture can be reduced, and the success rate of preparing piezoelectric materials can be improved. The present application also discloses a piezoelectric composite material prepared by the above-mentioned preparation method, which has the same effect.

Description

technical field [0001] The invention relates to the technical field of functional materials and their preparation, in particular to a method for preparing piezoelectric composite materials. The invention also relates to a piezoelectric composite material. Background technique [0002] Piezoelectric composite materials are materials with piezoelectric effect, which can realize mutual conversion between electrical energy and mechanical energy. Piezoelectric composite materials refer to materials composed of piezoelectric materials and polymers according to a certain connection mode, a certain volume and weight ratio, and a certain spatial geometric distribution. It has the advantages of two-phase materials. Therefore, it is widely used in water Acoustic transducers and ultrasonic transducers. [0003] The underwater acoustic transducer is a device that converts sound energy and electric energy into each other. It is a key component for transmitting and receiving sound waves ...

AI Technical Summary

Problems solved by technology

At present, there are two main methods of manufacturing 1-3 type piezoelectric composite materials. One is to use ion etching to isolate the trench-fill method. The thickness and the lowest frequency of the composite material, so this method is less used; the other is the mechanical cut-fill method, which is a method commonly used in low-frequency piezoelectric composite materials, but there are still many shortcomings in this method

[0005] Taking piezoelectric composite materials with a working frequency higher than 15MHz as an example, if the second preparation method is used to make 1-3 type piezoelectric composite materials by double cutting-filling method on one side, when it is carried out from the same side, due to the second The distance between the cutting knife groove and the first cutting knife groove becomes smaller, which increases the risk of collapse and fracture of the crystal column of the piezoelectric composite material, and makes cutting difficult, resulting in a low success rate of one-time preparation of the piezoelectric composite material

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