Preparation method of composite piezoelectric material based on PVDF-TrFE

Abstract

The invention relates to a preparation method of a composite piezoelectric material based on PVDF-TrFE. The preparation method comprises the following steps: weighing a polymer PVDF-TrFE powder; putting a mold liner into a tabletting mold, and pouring the weighed polymer PVDF-TrFE powder into a hot pressing mold; putting the prepared mold into a hot-pressing device, carrying out hot-pressing preparation, and then demolding to obtain a PVDF-TrFE matrix; carrying out hot-pressing shaping on the prepared composite piezoelectric material under a certain condition; cutting the prepared composite piezoelectric material by using a cutting machine, and carrying out hot-pressing shaping under the condition that a thickness is 0.5-2 mm; and using abrasive paper to carry out polishing, exposing a piezoelectric single crystal phase, and finally preparing a 1-3-type composite piezoelectric thin plate with certain flexibility. The performance of the PVDF-TrFE piezoelectric composite material is effectively improved, and therefore the composite material has wider application prospects in the aspects of transducers, energy collection and the like.

Description

technical field [0001] The invention relates to the field of functional materials, in particular to a method for preparing a novel piezoelectric composite material, in particular to a method for preparing a composite piezoelectric material based on PVDF-TrFE. Background technique [0002] Although traditional piezoelectric ceramics have the advantages of excellent piezoelectric performance, low cost, and mature preparation technology, they also have disadvantages such as brittleness and high acoustic impedance. The acoustic impedance of traditional piezoelectric ceramics is 30 Mrayl, and the acoustic impedance of human tissue is It is about 1.5 Mrayl. The mismatch of acoustic impedance will cause a large loss of ultrasonic waves during transmission, thus limiting the application prospects of piezoelectric ceramics. Piezoelectric polymers have high flexibility, low acoustic impedance, and are easy to large Area preparation, but its piezoelectric strain constant and electromec...

AI Technical Summary

Problems solved by technology

[0002] Although traditional piezoelectric ceramics have the advantages of excellent piezoelectric performance, low cost, and mature preparation technology, they also have disadvantages such as brittleness and high acoustic impedance. The acoustic impedance of traditional piezoelectric ceramics is 30 Mrayl, and the acoustic impedance of human tissue is It is about 1.5 Mrayl. The mismatch of acoustic impedance will cause a large loss of ultrasonic waves during transmission, thus limiting the application prospects of piezoelectric ceramics. Piezoelectric polymers have high flexibility, low acoustic impedance, and are easy to large Area preparation, but its piezoelectric strain constant and electromechanical coupling coefficient are low, and it cannot meet the requirements of the transducer alone. Therefore, a single piezoelectric material will be subject to many restrictions in the use of transducers;

Images