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Lead-free piezoceramics-polymer piezoelectric composite material and preparation method thereof

A ceramic material, piezoelectric composite technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, etc., can solve the problem of no lead-free piezoelectric ceramics, achieve good piezoelectric performance and dielectric performance, and simple process Effect

Inactive Publication Date: 2009-12-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The piezoelectric composite material prepared by the current method has no lead-free piezoelectric ceramics, especially the piezoelectric composite material of sodium potassium niobate-based lead-free piezoelectric ceramics and polymer polyvinylidene fluoride.

Method used

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  • Lead-free piezoceramics-polymer piezoelectric composite material and preparation method thereof
  • Lead-free piezoceramics-polymer piezoelectric composite material and preparation method thereof
  • Lead-free piezoceramics-polymer piezoelectric composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The powder tablet press used in this example is the 769YP-24B type of Tianjin Keqi High-tech Company; the ion sputtering device is the SBC-12 type of Beijing Zhongke Keyi Technology Development Co., Ltd.

[0027] According to the general formula (1-x)(K b Na 1-b )NbO 3 -xLiSbO 3 (x=0.052, b=0.052) the stoichiometric ratio of [KNNLS] carries out weighing raw material, to analyze pure anhydrous sodium carbonate (Na 2 CO 3 ), anhydrous potassium carbonate (K 2 CO 3 ), niobium pentoxide (Nb 2 o 5 ), lithium carbonate (Li 2 CO 3 ), and antimony trioxide (Sb 2 o 3 ) as raw materials, using the traditional process of preparing lead-free piezoelectric ceramics, that is, through ball milling and calcination to complete the pre-synthesis, then granulation, high-pressure molding into green body, after debinding, normal pressure sintering into porcelain; The KNNLS ceramic powder after granulation is mixed according to the volume ratio of ceramic powder and polyvinyliden...

Embodiment 2

[0031] Used powder tablet press and ion sputtering apparatus are identical with embodiment 1.

[0032] According to the general formula (1-x)(K b Na 1.15-b )NbO 3 -xLiNbO 3 (x=0.058, b=0.48) the stoichiometric ratio of [KNLN] carries out weighing raw material, to analyze pure anhydrous sodium carbonate (Na 2 CO 3 ), anhydrous potassium carbonate (K 2 CO 3 ), niobium pentoxide (Nb 2 o 5 ), and lithium carbonate (Li 2 CO 3 ), as raw materials, using the traditional process of preparing lead-free piezoelectric ceramics, that is, through ball milling and calcination to complete the pre-synthesis, then granulation, high-pressure molding into a green body, and normal pressure sintering into porcelain after debinding; The fine-grained KNLN ceramic powder is mixed according to the volume ratio of ceramic powder and polyvinylidene fluoride powder at a ratio of 78:22, and ball milled with absolute ethanol as the ball milling medium for 18 hours, then dried, and the dried mixtu...

Embodiment 3

[0036] Used powder tablet press and ion sputtering apparatus are identical with embodiment 1.

[0037] According to the general formula (1-x)(K b Na 1-b )NbO 3 -xBiScO 3 -yMnCO 3 (x=0.02, b=0.5, y=0.008) the stoichiometric ratio of [KNNBSM] carries out weighing raw material, to analyze pure anhydrous sodium carbonate (Na 2 CO 3 ), anhydrous potassium carbonate (K 2 CO 3 ), niobium pentoxide (Nb 2 o 5 ), bismuth trioxide (Bi 2 o 3 ), scandium trioxide (Sc 2 o 3 ) and manganese carbonate (MnCO 3 ) as raw materials, using the traditional process of preparing lead-free piezoelectric ceramics, that is, through ball milling and calcination to complete the pre-synthesis, then granulation, high-pressure molding into green bodies, and sintering into ceramics under normal pressure after debinding. The KNNBSM ceramic powder crushed into fine particles was mixed according to the volume ratio of ceramic powder and polyvinylidene fluoride powder at a volume ratio of 78:22, and...

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Abstract

The invention relates to a lead-free piezoceramics-polymer piezoelectric composite material and a preparation method thereof. The method comprises the following steps: preparing materials according to compositions in a chemical general formula (1-x)(LiaNabK1-a-b)(Nb1-cSbc)O3-xABO3-yM, taking analytically pure anhydrous carbonates or oxides as raw materials, and preparing ceramic powder by the conventional ceramic preparing process; performing mixing and ball-milling on the ceramic powder and polyvinylidene fluoride in a volume ratio of between 10:90 and 95:5; and drying, performing ultrasonic oscillation for 10 to 100 minutes, performing cold press molding on the mixed powder material by a tablet press, processing by heating through a muffle furnace, finally sputtering gold electrodes on the surface of the powder material, and performing polarization in a silicone oil bath at a temperature of between 80 and 130 DEG C for 10 to 120 minutes to prepare the potassium-sodium niobate-based lead-free piezoceramics-polymer piezoelectric composite material. The piezoelectric composite material has pure perovskite crystalline phase and no impurity phase to prove that the two have good solid solubility, and has good piezoelectric and dielectric properties.

Description

technical field [0001] The invention relates to a preparation technology of a piezoelectric composite material, in particular to a piezoelectric composite ceramic material of sodium potassium niobate (KNN) lead-free piezoelectric ceramic and polyvinylidene fluoride (PVDF) polymer and a preparation method thereof, It belongs to the technical field of piezoelectric composite materials. Background technique [0002] Since S.Roberts discovered the piezoelectricity of barium titanate in 1947, piezoelectric ceramic technology has developed very rapidly. So far, many piezoelectric ceramic materials with excellent performance have been developed, and their applications are also very wide, involving electronics, sensing, variable Pressure, underwater acoustic transducer, ultrasound, electro-optic and many other fields. Na 0.5 K 0.5 NbO 3 (abbreviated as NKN) piezoelectric ceramic materials belong to the perovskite structure and have a high Curie temperature (T C =420°C), low die...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08K3/24C04B35/495H01L41/22H01L41/37
Inventor 朱基亮李绪海王明松蒋猛朱建国肖定全
Owner SICHUAN UNIV
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