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Sodium bismuth titanate-system lead-free piezoelectric ceramic and preparation method thereof

A lead-free piezoelectric and sodium bismuth titanate technology, applied in the field of ceramic compositions, can solve the problems of strong coercive field, poor chemical stability, and low comprehensive piezoelectric performance, and achieve good piezoelectric performance and low production cost Effect

Inactive Publication Date: 2016-08-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure BNT ceramics have disadvantages such as strong coercive field at room temperature, high leakage current, poor chemical stability, and difficulty in obtaining dense ceramic bodies. In order to improve the piezoelectric properties of ceramics, adding a second component for doping modification has developed two Elementary and ternary systems, and studies have shown that it has better sintering characteristics and piezoelectric properties than pure BNT system ceramics, and has obtained a good electrostrain effect
However, the comprehensive piezoelectric performance of BNT-based lead-free piezoelectric ceramics is still relatively low. In order to obtain a better electrostrain effect, there are few reports on Li equivalent doping of bismuth sodium titanate system.

Method used

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  • Sodium bismuth titanate-system lead-free piezoelectric ceramic and preparation method thereof
  • Sodium bismuth titanate-system lead-free piezoelectric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Ingredients synthesis

[0038] According to 0.96 (Bi 0.5 Na 0.44-x K 0.06 Li x )TiO 3 -0.04BaTiO 3 , the stoichiometric ratio of x=0.005 takes raw material Bi 2 o 3 、K 2 CO 3 、Na 2 CO 3 、TiO 2 , Li 2 CO 3 , and Ba 2 CO 3 , mix evenly, put it into a ball mill jar, use absolute ethanol and zirconia balls as the ball mill medium, mill at a speed of 800 rpm for 5 hours, and then place the milled slurry in an oven for drying at 80°C ;

[0039] (2) pre-burning

[0040] Put the powder dried in step (1) into an alumina crucible, pre-fire it in a muffle furnace at 850°C, keep it warm for 5 hours, then cool it down to room temperature naturally, and then put the pre-fired powder in a ball mill Carry out secondary ball milling, that is, ball milling at a speed of 800 revolutions per minute for 5 hours to obtain ball milling slurry, and then place the slurry in an oven to dry at 80°C;

[0041] (3) Granulation

[0042] Grind the dried powder in step (2) in a ...

Embodiment 2

[0058] The stoichiometric ratio of the raw material composition of embodiment 2, x=0.025 wherein, other process conditions are identical with embodiment 1.

[0059] The piezoelectric ceramics prepared in this experiment were analyzed by XRD, which showed that the piezoelectric ceramics had a single perovskite structure.

[0060] The detection performance is as follows:

[0061] d 33 (pC / N)ε r tanδ

[0062] 210 1207 0.030

Embodiment 3

[0064] The stoichiometric ratio of the raw material composition of embodiment 3, x=0.045 wherein, other process conditions are identical with embodiment 1.

[0065] The piezoelectric ceramics prepared in this experiment were analyzed by XRD, which showed that the piezoelectric ceramics had a single perovskite structure.

[0066] The detection performance is as follows:

[0067] d 33 (pC / N)ε r tanδ

[0068] 205 1347 0.043

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Abstract

The invention discloses a bismuth-sodium titanate system lead-free piezoelectric ceramic and a preparation method thereof. The raw material components and their molar percentages are 0.96 (Bi 0.5 Na 0.44‑x K 0.06 Li x )TiO 3 ‑0.04BaTiO 3 , where x=0.005~0.065. Bi first 2 o 3 、K 2 CO 3 、Na 2 CO 3 、TiO 2 , Li 2 CO 3 , and Ba 2 CO 3 , mixed ingredients, after ball milling, drying, pre-fired at 850 ° C, and then after the second ball milling, drying, granulation, molding, debinding, sintering at 1100 ~ 1200 ° C, and then after being silvered and polarized, Lead-free piezoelectric ceramics were prepared. The main crystal phase of the material of the invention is a perovskite structure, and there is a maximum strain of 0.37% under an electric field of 6.5 kilovolts per millimeter, and has good piezoelectric performance, and the preparation process is stable, repeatable and practical. The lead-free piezoelectric ceramic material can be used in various fields such as piezoelectric lighters, drivers, and sensors.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a bismuth sodium titanate system lead-free piezoelectric ceramic and a preparation method thereof. Background technique [0002] Piezoelectric ceramics is a functional ceramic material that can convert mechanical energy and electrical energy into each other. It is an important class of electrical functional materials. , electronics, communications, precision control, national defense and military and other aspects. [0003] Due to the large electrostrain characteristics of lead-based piezoelectric ceramics, lead-containing electrostrain materials have played an important and irreplaceable role in electronic information products for a long time, but the toxicity of Pb makes the ceramics of this system in the process of production, use and disposal It will cause serious consequences to the human ecological environment. The governments of major industrial countr...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/622C04B41/90
CPCC04B35/475C04B35/622C04B41/009C04B41/52C04B41/90C04B2111/00844C04B2111/90C04B2235/3201C04B2235/3203C04B2235/3215C04B2235/3234C04B2235/3236C04B2235/768C04B41/5116C04B41/4535C04B41/0072C04B41/4961
Inventor 戴叶婧尹东升赵志浩
Owner TIANJIN UNIV
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