Preparation method of piezoelectric ceramic polymer composite material

Abstract

The invention discloses a preparation method of piezoelectric ceramic polymer composite material. Compared with a common preparation technology, the dielectric constant of the piezoelectric composite material prepared by an electrophoresis auxiliary preparation technology is enhanced for about 50%, the piezoelectric coefficient is enhanced for about 50% and ferroelectric property is also substantially enhanced so that operation is easy, cost is low and the piezoelectric, dielectric and ferroelectric properties are substantially enhanced, and the preparation method has great actual application prospect in the field of intelligent sensing.

Description

technical field [0001] The invention relates to the technical field of piezoelectric ceramics, in particular to a preparation method of a piezoelectric ceramic polymer composite material. Background technique [0002] Piezoelectric ceramic polymer composite material is a new type of material composed of piezoelectric ceramic phase (such as PZT) and polymer (such as PVDF) through a composite process. Piezoelectric ceramic materials have the advantages of excellent piezoelectric performance, low dielectric loss and large electromechanical coupling coefficient, but they are hard and brittle, difficult to form and process, and have poor impact resistance. Although piezoelectric polymers have low density and good flexibility, and can be prepared into large and uniform films, their piezoelectric properties are poor. Piezoelectric composite materials have the advantages of both ceramics and polymers, and can suppress their respective shortcomings. They are low in cost and suitable...

AI Technical Summary

Problems solved by technology

In the current piezoelectric composite material system, the piezoelectric particles in the 0-3 type piezoelectric composite material are filled with organic polymer phases, and the connectivity of the ceramic particles is poor, and the dielectric constant is greatly different, resulting in the ceramic phase Polarization is difficult; at the same time, the difference in mechanical properties between the two phases makes it difficult to conduct force between the two phases; ultimately resulting in poor piezoelectric properties of the composite material

There are mainly two ways to improve the piezoelectric performance of composite materials reported in the literature at present. (1) Increase the volume fraction of the ceramic phase. When the volume fraction of the ceramic phase exceeds 80%, the piezoelectric performance is greatly improved, and the piezoelectric strain constant d33 can be More than 90pC / N, but too high volume fraction of ceramic phase will lead to poor toughness of composite materials

(2) The purpose of adding a third-phase conductive / semiconductive material is to improve the polarization performance of the ceramic phase, but the improvement is often limited. At the same time, adding too much third-phase conductive material will lead to other negative effects, such as excessive loss

Type 1-3 piezoelectric ceramic polymer composite piezoelectric materials are prepared by arranging piezoelectric ceramic fibers or piezoelectric columnar samples in an array of organic polymer matrix. In this type of composite materials, due to piezoelectric The ceramic fiber runs through the organic polymer matrix, and the material can be fully polarized, so its piezoelectric and dielectric properties are far superior to 0-3 composite materials. However, the manufacturing cost of piezoelectric ceramic fiber is very high, and the preparation of 1-3 Type composite materials require a very complicated process, which greatly restricts their application in practical devices.

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