Piezoelectric component having multilayer composite structure and preparation method thereof

Abstract

The invention relates to a piezoelectric component having a multilayer composite structure and a preparation method thereof. The component is made of a material with piezoelectricity, the piezoelectric component having the multilayer composite structure has three-layer structure, and the structures of three layers are communicated together to form a whole; two end face layers are provided with piezoelectric material strips arranged in parallel, and the middle layer is provided with a piezoelectric material granule post; and legacy electrode layers are formed on the surfaces of the piezoelectric material strips on the two end face layers. The piezoelectric component having the multilayer composite structure is a circular, square or polygonal planar component. The invention is characterized in that: the piezoelectric component is easy and convenient to prepare and controllable in performance; the electrode layers of two ends can be welded through high-temperature leads, and all the structures of three layers are communicated, so the piezoelectric component has high strength and reliability; and the parameters of the piezoelectric component are superior to those of a solid piezoelectric component of the same overall dimension.

Description

technical field [0001] The present invention relates to a technical field of functional materials and preparation methods thereof, in particular to a piezoelectric component with a multilayer composite structure used in underwater acoustics, medical ultrasound, industrial ultrasonic detection and the like and a preparation method thereof. Background technique [0002] The development of piezoelectric materials is tortuous. In the 1880s, the Curie brothers first discovered the piezoelectric effect on quartz crystals. In the 1950s, people developed piezoelectric ceramics represented by lead zirconate titanate (PZT). This type of material has the characteristics of good piezoelectric performance and high electromechanical coupling coefficient, and is widely used in the fields of electroacoustics, underwater acoustics and ultrasound, such as piezoelectric vibrators, piezoelectric ignition devices, piezoelectric transformers, piezoelectric filters, etc. However, due to the large...

AI Technical Summary

Problems solved by technology

However, due to the large density and elastic modulus of piezoelectric ceramics and the small hydrostatic piezoelectric constant, the transducers produced have poor impact resistance, are heavy, and are not easy to match with air and water, which is difficult to meet the requirements of hydrophones and medical Transducer Requirements

In the 1970s, polymer piezoelectric materials represented by polyvinylidene fluoride (PVDF) had stable chemical properties and good flexibility, and could produce large-area and uniform films, and their acoustic impedance was easily comparable to that of water and living organisms. It can be widely used in ultrasonic transducers, underwater acoustic transducers, biosensors, pyroelectric devices, etc., but its piezoelectric constant and electromechanical coupling coefficient are small, and its working range is narrow

Type 1-3 has become a practical commodity and has become the most researched, deepest and most widely used piezoelectric composite material, but its electrode layer needs to be re-prepared, basically using low-temperature vacuum distillation or sputtering, combined with The accuracy is not high, and it is mostly used for receiving transducers. When it is used for high-voltage transmitting transducers, the reliability is not high, and the production process is complicated and the process is various.

Images