Improved polymer phase-based 1-3 type piezoelectric composite material and preparation method therefor

Abstract

The invention relates to an improved polymer phase-based 1-3 type piezoelectric composite material and a preparation method therefor. According to the piezoelectric composite material, a sandwich type structure which is formed by epoxy resin, silicone rubber and other polymer is adopted to improve the polymer phase material to reduce influence to piezoelectric column vibration and to further improve the overall electromechanical coupling coefficient of the composite material. By adoption of a finite element analysis tool, the changing relation of resonant frequency, sound velocity, electromechanical coupling coefficient and characteristic impedance of the novel piezoelectric composite material along with volume percentages of silicone rubber is simulated; the piezoelectric composite material is prepared according to the simulation result and the performance of the material is tested; the test result proves that the experiment is basically matched with simulation; the electromechanical coupling coefficient of the composite material is improved by 11% compared with that of the conventional 1-3 type composite material; and the improved polymer phase-based 1-3 type piezoelectric composite material provided by the invention is quite suitable for manufacturing a piezoelectric composite material transducer with high electromechanical conversion efficiency.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric composite materials, and in particular relates to a 1-3 type piezoelectric composite material based on an improved polymer phase and a preparation method thereof. Background technique [0002] 1-3 Piezoelectric composite material is a piezoelectric composite material composed of two-phase materials formed by periodically distributing one-dimensionally connected piezoelectric phases in three-dimensionally connected polymer phases. Due to its high thickness electromechanical coupling coefficient, low mechanical quality factor and acoustic impedance, it has been widely studied and used in underwater acoustic transducers, ultrasonic detection, biomedical imaging and other fields. [0003] Rouffaud et al. (Rouffaud R, Levassort F, Pham T M, et al. Super-Cell Piezoelectric Composite With 1-3 Connectivity. [J]. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2016, 63(12): 2...

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Problems solved by technology

However, these existing technologies have disadvantages such as complicated production process and poor mechanical stability.

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