Process for preparing piezoelectric ceramic and polymer piezoelectric composite material

A technology of piezoelectric composite materials and piezoelectric ceramics, which can be used in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., and can solve the problems of poor bonding between two phases of composite materials.

Inactive Publication Date: 2006-01-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a microwave preparation method of piezoelectric ceramics and polymer piezoelectric composite materials, which can solve the problem of poor bonding between the two-phase interfaces of composite materials

Method used

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  • Process for preparing piezoelectric ceramic and polymer piezoelectric composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Mix 70% PZT and 30% PVDF powders by volume, and ball mill for 8 hours with absolute ethanol as the ball milling medium. After the mixture is dried, it is compressed into a mold, and then the compressed mixture is irradiated together with the mold. The microwave frequency is 2.45GHz, the irradiation power is 800W, and the irradiation time is 10 minutes. Piezoelectric ceramic-polymer composites. Tested at normal temperature and 1KHz, when the PZT volume content is 70%, the dielectric constant of the composite material is 105, and the piezoelectric constant is 52pC / N. The interface of the composite material is well bonded, which is beneficial to the polarization of piezoelectric ceramics and improves the electrical properties of the composite material.

Embodiment 2

[0016] Embodiment 2: 50% P (VDF-TrFE) and 50% PT powder are mixed by volume ratio, add dehydrated alcohol wet milling evenly, after drying, press molding in the mould, then the mixed material of pressing Microwave irradiation is carried out together with the mold, the microwave frequency is 2.45GHz, the irradiation power is 900W, and the irradiation time is 10 minutes, and the piezoelectric ceramic-polymer composite material is prepared. Tested at normal temperature and 1KHz, when the PT volume content is 50%, the dielectric constant of the composite material is 61, and the piezoelectric constant is 30pC / N.

Embodiment 3

[0017] Embodiment 3: 70% PE and 30% PCM powder are mixed by volume ratio, after drying, press molding in self-made mould, adopt VW1500 type frequency conversion microwave instrument to carry out microwave irradiation to the pressed mixture, microwave frequency is 6-18GHz, the irradiation power is 125W, and the irradiation time is 120 minutes, and the piezoelectric ceramic-polymer composite material is prepared. Tested at normal temperature and 1KHz, when the volume content of PCM is 50%, the dielectric constant of the composite material is 34, and the piezoelectric constant is 19pC / N.

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Abstract

The present invention relates to the preparation process of composite piezoelectric material comprising piezoelectric ceramic and polymer. The preparation process includes the following steps: crushing or quenching piezoelectric ceramic and sieving to obtain piezoelectric ceramic powder, mixing piezoelectric ceramic powder and polymer in the volume ratio of 100 to 30-55, stoving, forming in mold in conventional polymer forming method, and irradiating the mixed material inside mold with microwave of frequency 2.45-24.125 GHz and power 125-1500 W for 3-120 min to obtain the composite piezoelectric material. Testing at normal temperature and 1 KHz frequency, the composite piezoelectric material has dielectric constant 150 and piezoelectric constant 65 pC / N.

Description

Technical field: [0001] The invention belongs to a preparation method of piezoelectric ceramics and polymer piezoelectric composite materials, in particular to a preparation method of high-content piezoelectric ceramics and polymer composite materials. Background technique [0002] Piezoelectric composite material is a new type of material composed of piezoelectric ceramics and polymers through a composite process. Through the composite effect, it has properties that the original component materials do not have. In the past two decades, piezoelectric composite materials have made full use of the linear and nonlinear effects of composite materials through the optimization design of piezoelectric composite materials, and obtained the advantages of both ceramics and polymers, and the obtained composite materials are flexible. Good performance, can be made into a large and uniform film, low acoustic impedance, easy to be compatible with air, water and skin, and its piezoelectric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/634C04B35/462H01L41/187
Inventor 熊传溪刘晓芳孙华君董丽杰
Owner WUHAN UNIV OF TECH
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