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Piezoelectric composite material and preparation method thereof

A technology of piezoelectric composite materials and pressure-sensitive materials, applied in the field of three-phase composite materials of polyvinylidene fluoride (PVDF) and pressure-sensitive ceramics, piezoelectric ceramics, can solve the problem of low polarization resistance, easy breakdown, pressure Poor electrical performance and other issues, to achieve the effect of low cost, promote migration, and increase coupling

Active Publication Date: 2015-04-08
SUZHOU PANT PIEZOELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the disadvantages of poor piezoelectric performance of piezoelectric composite materials and the low polarization resistance and easy breakdown of piezoelectric composite materials after adding conductive phases, and provide a piezoelectric composite with good piezoelectric performance and simple preparation process. electrical composites

Method used

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  • Piezoelectric composite material and preparation method thereof
  • Piezoelectric composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] PLZT is prepared by the traditional solid-state method. According to the stoichiometric ratio, the piezoelectric ceramic sheet is prepared through mixing, pre-firing, film rolling, punching, debinding, and firing. Its properties are: ε 33 t / ε 0 =2000±250, tanδ=1.5%~3.0%, d 33 >300 pC / N, vibrate the ceramic sheet in a vibrating mill, pass through different mesh sieves, and prepare PLZT ceramic powders of different particle sizes for use.

[0024] Will account for 1.5% of the total weight of PLZT and PVDF mixture of TiO 2 Add pressure-sensitive ceramic powder into a stainless steel cup, add alcohol for ultrasonic dispersion for 5 minutes, add PVDF powder with a mass fraction of 4.7% for ultrasonic dispersion for 15 minutes, and then add 250-300 mesh piezoelectric ceramic powder with a mass fraction of 95.3% for electric stirring and evaporation of alcohol. Three-phase blend powder. A disc with a diameter of 17.6 mm and a thickness of 2 mm was prepared by dry pressing...

Embodiment 2

[0028] The preparation method of PLZT ceramic powder is the same as embodiment 1.

[0029] Add 0.5% ZnO pressure-sensitive ceramic powder accounting for the total weight of the PLZT and PVDF mixture into a stainless steel cup, add a certain amount of dispersant, and after ultrasonic dispersion for 1 hour, add PVDF with a mass fraction of 4.7%, and wait until the PVDF is completely dissolved , adding PLZT ceramic powder with a mass fraction of 95.3%, electric stirring for 4 hours, rotary evaporation to the required viscosity, pouring it into a self-made casting device, scraping and drying to obtain a film with a thickness of 0.2~0.4 mm, and superimposing two layers of film The composite film was prepared by hot pressing on a flat vulcanizer, and the composite film was punched to make a circular piezoelectric composite sheet with a diameter of 8.9 mm and a thickness of 0.4-0.6 mm. The hot pressing conditions were: hot pressing temperature 180 °C, pressure 10 Mpa, holding time 30...

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Abstract

The invention provides a piezoelectric ceramic, polyvinylidene fluoride (PVDF) and pressure-sensitive material three-phase composite material with high piezoelectric property. The pressure-sensitive material is added to a piezoelectric ceramic / PVDF piezoelectric composite material as an intermediate layer, so as to play a bridging role; the interfacial bonding properties of the piezoelectric ceramic and the PVDF are improved; coupling between the piezoelectric ceramic and the PVDF is increased; electron migration between ceramic particles is promoted; and the polarization voltage of a ceramic phase is improved. In addition, due to the nonlinear current-voltage characteristics of the pressure-sensitive material, when the pressure-sensitive material is added to the piezoelectric ceramic and PVDF composite material, the polarization-resistant voltage of the piezoelectric composite material is improved; and the overall piezoelectric property of the composite material is improved. Therefore, the piezoelectric composite material is simple in process, and low in cost; the piezoelectric composite film with excellent overall performance and large size can be prepared; and the piezoelectric composite material is expected to be applied to a piezoelectric touchpad, thus industrialized production is achieved.

Description

technical field [0001] The invention relates to a piezoelectric composite material, in particular to a three-phase composite material of piezoelectric ceramics, polyvinylidene fluoride (PVDF) and pressure-sensitive ceramics. technical background [0002] Piezoelectric composite material is a new type of material composed of piezoelectric ceramic phase (such as PZT) and polymer (PVDF, other copolymers) 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. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/634C04B35/622
Inventor 范景波唐志兰李旺
Owner SUZHOU PANT PIEZOELECTRIC TECH
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