Sodium bismuth titanate-based high-strain lead-free piezoelectric ceramic and preparation method thereof

A sodium bismuth titanate-based, lead-free piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problem of low strain and achieve good performance and excellent pressure. The effect of improving electrical properties and sintering properties

Inactive Publication Date: 2011-09-07
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the existing lead-based piezoelectric ceramics with low st...

Method used

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  • Sodium bismuth titanate-based high-strain lead-free piezoelectric ceramic and preparation method thereof
  • Sodium bismuth titanate-based high-strain lead-free piezoelectric ceramic and preparation method thereof
  • Sodium bismuth titanate-based high-strain lead-free piezoelectric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1, to analyze pure BaCO 3 、 Bi 2 o 3 、TiO 2 , Li 2 CO 3 、Na 2 CO 3 As the base material, according to the stoichiometric ratio is 0.92Na 0.5 Bi 0.5 TiO 3 -0.08BaTiO 3 Ratio, accurate weighing. Then put the zirconia balls, material and ethanol into the ball mill jar according to the ratio of 3:1:1 and ball mill for 8 hours. The ground material is dried and pressed into large sheets, and pre-fired at 800°C for 5 hours. The calcined powder was ball milled for 8 hours and then sieved. The sieved powder is pre-pressed into a disc with a diameter of 12mm and a thickness of 1-1.5mm, and then finally shaped under an isostatic pressure of 100MPa. The molded wafer was kept at 1100° C. for 4 hours to obtain bismuth sodium titanate-based high-strain lead-free piezoelectric ceramics. After sintering into porcelain, it is ground and polished, then coated with silver paste, and kept at 550°C for 30 minutes to fire the silver electrode.

[0019] After the electri...

Embodiment 2

[0021] Example 2, to analyze pure BaCO 3 、 Bi 2 o 3 、TiO 2 , Li 2 CO 3 、Na 2 CO 3 As the base material, according to the stoichiometric ratio of 0.92 (Na 0.98 Li 0.02 ) 0.5 Bi 0.5 TiO 3 -0.08BaTiO 3 Ratio, accurate weighing. Then put the zirconia balls, material and ethanol into the ball mill jar according to the ratio of 3:1:1 and ball mill for 12 hours. The ground material is dried and pressed into large sheets, and pre-fired at 850°C for 4 hours. The calcined powder was ball milled for another 12 hours and then sieved. The sieved powder is pre-pressed into a disc with a diameter of 12mm and a thickness of 1-1.5mm, and then finally shaped under an isostatic pressure of 60MPa. The molded wafer was kept at 1125° C. for 3 hours to obtain bismuth sodium titanate-based high-strain lead-free piezoelectric ceramics. After sintering into porcelain, it is ground and polished, then coated with silver paste, and kept at 575°C for 25 minutes to burn the silver electrode....

Embodiment 3

[0024] Example 3, to analyze pure BaCO 3 、 Bi 2 o 3 、TiO 2 , Li 2 CO 3 、Na 2 CO 3 As the base material, according to the stoichiometric ratio of 0.92 (Na 0.91 Li 0.09 ) 0.5 Bi 0.5 TiO 3 -0.08BaTiO 3 Ratio, accurate weighing. Then put zirconia balls, material and ethanol into a ball mill jar in a ratio of 3:1:1 for ball milling for 10 hours. The ground material is dried and pressed into large sheets, and pre-fired at 900°C for 3 hours. The calcined powder was then ball milled for 10 hours and then sieved. The sieved powder is pre-pressed into a disc with a diameter of 12mm and a thickness of 1-1.5mm, and then finally shaped under an isostatic pressure of 20MPa. The molded wafer was kept at 1150° C. for 2 hours to obtain bismuth sodium titanate-based high-strain lead-free piezoelectric ceramics. After sintering into porcelain, it is ground and polished, then coated with silver paste, and kept at 600°C for 20 minutes to burn the silver electrode.

[0025] After t...

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Abstract

The invention discloses sodium bismuth titanate-based high-strain lead-free piezoelectric ceramic and a preparation method thereof, aiming to solve the technical problem that the existing lead-based piezoelectric ceramic has low strain quantity. The technical scheme of the invention is as follows: dosing analytically pure BaCO3, Bi2O3, TiO2, Li2CO3 and Na2CO3 at a stoichiometric ratio of (Na1-xLix)0.5Bi0.5TiO3-BaTiO3, wherein 0<=x<=0.09; performing ball milling on the dosed materials in a ball mill tank, drying the ball milling mixture, briquetting, pre-calcining, taking out the calcined materials to break, performing ball milling again, and sieving; prepressing the sieved powder into sheets, and then performing isostatic pressing; and sintering the moulded sheets to obtain the sodium bismuth titanate-based high strain lead-free piezoelectric ceramic. As the binary system piezoelectric ceramic has good piezoelectric property, the strain quantity is increased from 0.15% in the background art to 0.21-0.27%.

Description

technical field [0001] The invention relates to a lead-free piezoelectric ceramic, in particular to a bismuth sodium titanate-based high-strain lead-free piezoelectric ceramic. It also relates to a preparation method of the bismuth sodium titanate-based high-strain lead-free piezoelectric ceramics. Background technique [0002] Piezoelectric ceramic materials are widely used in many fields such as communications, home appliances, aviation, detection and computers, and are extremely important functional ceramic materials. However, the piezoelectric ceramics used on a large scale now are lead-based piezoelectric ceramics, that is, the binary system PbTiO 3 -PbZrO 3 and ternary PbTiO 3 -PbZrO 3 -ABO 3 (ABO 3 Piezoelectric ceramics that are composite perovskite ferroelectrics). PbO or Pb in raw materials of lead-based piezoelectric ceramics 3 o 4 About 70% of the total, and PbO or Pb 3 o 4 It is easy to volatilize during the sintering process of ceramics. Piezoelectr...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622H01L41/187
Inventor 樊慧庆时婧
Owner NORTHWESTERN POLYTECHNICAL UNIV
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