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Niobate-series leadless piezoelectric ceramic-polymer three-phase composite material with high dielectric constant

A lead-free piezoelectric and composite material technology is applied in the field of high dielectric composite materials to achieve the effects of high dielectric constant, low cost and simple equipment

Inactive Publication Date: 2011-11-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study of high dielectric constant polymer-based three-phase composites with sodium potassium niobate as the ceramic phase has not been reported yet

Method used

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  • Niobate-series leadless piezoelectric ceramic-polymer three-phase composite material with high dielectric constant
  • Niobate-series leadless piezoelectric ceramic-polymer three-phase composite material with high dielectric constant
  • Niobate-series leadless piezoelectric ceramic-polymer three-phase composite material with high dielectric constant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The lead-free piezoelectric ceramic fine powder KNNBS was prepared according to the above-mentioned materials and preparation process steps, and the prepared KNNBS, PVDF and MWNTs were prepared into composite powder according to the volume fraction of 70:29.8:0.2; the composite powder was placed in In the tablet press, a disc with a diameter of 10mm and a thickness of 0.5mm was pressed into a disc with a diameter of 10mm and a thickness of 0.5mm; the obtained disc was placed in a muffle furnace and heat-treated at a temperature of 80°C for 2h to obtain KNNBS-PVDF- MWNTs three-phase composite material sample; Sputter the gold electrode on the surface of the obtained sample with a small ion sputtering instrument; after standing in the air for 24 hours, test the relative dielectric constant and dielectric loss of the sample at 1kHz; the ingredients used in this example The volume percentage, and the relative dielectric constant and dielectric loss of the measured samples are...

Embodiment 2

[0035] As in Example 1, the lead-free piezoelectric ceramic fine powder KNNBS was prepared according to the above-mentioned materials and preparation process steps, and the prepared KNNBS, PVDF and MWNTs were formulated into composite material powder according to the volume fraction of 70:29:1; Place the composite material powder in a tablet press and press 10 MPa pressure to form discs with a diameter of 10 mm and a thickness of 0.5 mm; the obtained discs are placed in a muffle furnace and heat treated at a temperature of 150 ℃ for 4 hours, namely Prepare the KNNBS-PVDF-MWNTs three-phase composite material sample; Sputter the gold electrode on the surface of the obtained sample with a small ion sputtering apparatus; after standing in the air for 24 hours, test the relative permittivity and dielectric constant of the sample at 1kHz Electrical loss; the volume percentage of ingredients used in this example, and the relative dielectric constant and dielectric loss of the measured ...

Embodiment 3

[0039] As in Example 1, the lead-free piezoelectric ceramic fine powder KNNBS was prepared according to the above-mentioned materials and preparation process steps, and KNNBS, PVDF and MWNTs were prepared into composite powder according to the volume fraction of 70:28.4:1.6; the composite material The powder is placed in a tablet press and pressed into a disc with a diameter of 10 mm and a thickness of 0.7 mm under a pressure of 18 MPa; the obtained disc is placed in a muffle furnace and heat-treated at a temperature of 220° C. for 8 hours to obtain KNNBS -PVDF-MWNTs three-phase composite material sample; Sputter the gold electrode on the surface of the obtained sample with a small ion sputtering instrument; after standing in the air for 24 hours, test the relative dielectric constant and dielectric loss of the sample at 1kHz; The volume percentage of ingredients used in the example, and the relative dielectric constant and dielectric loss of the measured samples are shown in Ta...

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Abstract

The invention discloses a niobate-series leadless piezoelectric ceramic-polymer three-phase composite material with a high dielectric constant and a preparation method thereof. The method comprises the following steps of: burdening according to a formula, i.e., (1-x)(LiaNabK1-a-b)(Nb1-cSbc)O3-xABO3-yM and preparing sodium niobate kalium-based leadless piezoelectric ceramic powder by adopting the conventional solid phase method; and mixing ceramic powder, a polymer and a multiwall carbon nanotube into composite material powder according to a designed proportion, adding an organic solvent for dissolving the polymer, performing ultrasonic dispersion, adding ethanol for precipitating the polymer, filtering, performing cold press molding on the composite material powder, heating, and sputtering a gold electrode on the surface of the molded composite material powder to obtain a niobate-series leadless piezoelectric ceramic-polymer-multiwall carbon nanotube three-phase composite material with a high dielectric constant. The relative dielectric constant of the composite material can be up to 105-108 at 1kHz, and the three-phase composite material has a good application prospect.

Description

Technical field [0001] The present invention relates to a type of lead-free piezoelectric ceramic-polymer three-phase composite material, in particular to a type of sodium potassium niobate-based lead-free piezoelectric ceramics and polymer polyvinylidene fluoride (PVDF) and polyvinylidene fluoride (PVDF) with high dielectric constant A three-phase composite material of walled carbon nanotubes (MWNTs) and a preparation method thereof belong to the technical field of high-dielectric composite materials. Background technique [0002] Due to its excellent dielectric properties, high-dielectric materials have broad application prospects in solid-state capacitors and microwave dielectric components, such as applications in dynamic random access memory (DRAM). High dielectric ceramics such as CaCu 3 Ti 4 O 12 Because of its good dielectric properties, it has been widely valued. However, although high dielectric ceramics have good dielectric properties, they have greater brittleness and...

Claims

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Application Information

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IPC IPC(8): C04B26/08C04B35/495C04B35/626
Inventor 朱基亮李绪海王明松刘静朱建国肖定全
Owner SICHUAN UNIV
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