2-2 type piezoelectric composite material and preparation method and application thereof

Abstract

The invention discloses a 2-2 type piezoelectric composite material and a preparation method and application thereof. The composite material comprises a piezoelectric material serving as a functional phase and epoxy resin serving as a filling phase. The multiple layers of piezoelectric materials and the multiple layers of composite materials are alternately stacked in sequence; and the piezoelectric material is a PIMNT (Phosphorus Indium Maleic Nitride) ternary system piezoelectric single crystal. The volume fraction of the piezoelectric material in the composite material is 45%-55%. And the aspect ratio of the single-layer piezoelectric material is 0.1-0.25. The EPO-TEK301 epoxy resin is adopted as a polymer matrix, the fluidity and the bonding force are excellent, the hardness is moderate after curing, meanwhile, the density is low, the acoustic impedance can be reduced after the EPO-TEK301 epoxy resin is compounded with the piezoelectric single crystal, and the acoustic matching performance is greatly improved. In addition, the preferable volume fraction is 50%, the aspect ratio is 0.2, the high performance of the composite material can be effectively kept, meanwhile, the crystal fracture rate is reduced, and therefore the preparation success rate is increased.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic materials, and in particular relates to a 2-2 type piezoelectric composite material and its preparation method and application. Background technique [0002] As the "clairvoyance" and "wind ear" in the ocean, underwater acoustic equipment is widely used in underwater communication and navigation, marine resources, marine geology and landforms, and has become the main equipment for underwater information acquisition. As an important part of underwater acoustic equipment, underwater acoustic transducers play a key role in realizing underwater target detection, tracking, identification, positioning, striking and underwater acoustic countermeasures. Piezoelectric materials are the core key materials of underwater acoustic transducers, which directly affect and restrict the performance and combat effectiveness of underwater acoustic equipment. With the development of underwater acoustic transducers...

AI Technical Summary

Problems solved by technology

Piezoelectric single crystal has excellent piezoelectric performance, has extremely high piezoelectric constant and electromechanical coupling coefficient, and its anisotropy makes large-area single crystal also have relatively pure vibration mode; but the disadvantage is that the density and acoustic impedance are high , the acoustic matching performance is poor, and it cannot match well with human tissue and water

Polymer materials have good flexibility, low density, light weight, impedance matching with air, human body and water, and elastic compliance coefficient is two orders of magnitude larger than piezoelectric ceramics; but the disadvantage is that the piezoelectric coefficient and electromechanical coupling coefficient are very small, not suitable for Used to make transmitting transducers with high dielectric loss

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