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Solid solution-modified sodium bismuth titanate leadless piezoelectric ceramics and preparation method thereof

A bismuth sodium titanate-based, lead-free piezoelectric technology, applied in the field of functional ceramics, can solve the problems of high coercive field, difficult polarization, high production cost, etc., to improve piezoelectricity and electromechanical coupling coefficient, grain size Uniform distribution and improved electromechanical coupling coefficient

Active Publication Date: 2014-06-04
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to obtain a dense microcrystalline structure, high coercive field, and difficult to polarize the material prepared by traditional electronic ceramics, and its performance is difficult to be practical.
Many researchers at home and abroad have carried out a lot of research work on pure NBT ceramics, such as substitution of A and B sites, doping modification, preparation method and process modification, but there is still a big gap from practical application. A series of new preparation processes such as grain orientation technology and soft solution preparation technology are used to improve material properties, but these preparation technologies are still in the exploratory stage, and the production cost is high, the process is complex and the process stability is not ideal, and research is still carried out in the laboratory. thus greatly restricting its popularization and application

Method used

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  • Solid solution-modified sodium bismuth titanate leadless piezoelectric ceramics and preparation method thereof
  • Solid solution-modified sodium bismuth titanate leadless piezoelectric ceramics and preparation method thereof
  • Solid solution-modified sodium bismuth titanate leadless piezoelectric ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The general composition formula of the lead-free piezoelectric ceramics prepared in this embodiment is:

[0034] 0.96(0.74Na 0.5 Bi 0.5 TiO 3 -0.26SrTiO 3 )-0.04Ba(Zr 0.05 Ti 0.95 )O 3 .

[0035] Preparation method and performance test:

[0036] (1) Choose anhydrous NaCO 3 、 Bi 2 o 3 , SrCO 3 、BaCO 3 , ZrO 2 and TiO 2 As the raw material, it is weighed according to the general composition formula, and then mixed by planetary wet ball milling process to obtain powder A (absolute ethanol is used as the ball milling medium, and the ball milling time is 4h); the dried powder A is placed in the muffle In the furnace, the temperature was raised from room temperature to 850 °C at a rate of 3 °C / min, and the temperature was kept for 1 hour. After the temperature was kept, the porcelain powder was cooled to room temperature with the furnace; Deionized water is used as the ball milling medium, and the ball milling time is 4 hours);

[0037] (2) Add a binder to the...

Embodiment 2

[0042] The general composition formula of the lead-free piezoelectric ceramics prepared in this example is

[0043] 0.94 (0.74Na 0.5 Bi 0.5 TiO 3 -0.26SrTiO 3 )-0.06Ba(Zr 0.05 Ti 0.95 )O 3 .

[0044] Preparation method and performance test:

[0045] (1) Choose anhydrous NaCO 3 、 Bi 2 o 3 , SrCO 3 、BaCO 3 , ZrO 2 and TiO 2 As the raw material, weigh the material according to the general composition formula, and then use the planetary wet ball milling process to mix the materials to obtain powder A (absolute ethanol is used as the ball milling medium, and the ball milling is 4h); the dried powder A is placed in the muffle furnace Raise from room temperature to 800°C at a speed of 3°C / min, keep warm for 2 hours, and then cool down to room temperature with the furnace to obtain porcelain powder; finely grind the porcelain powder to obtain powder B (using wet ball milling process to deionize Water is the ball milling medium, ball milling 4h);

[0046] (2) Add a bind...

Embodiment 3

[0052] The general composition formula of the lead-free piezoelectric ceramics prepared in this example is

[0053] 0.93(0.9Na 0.5 Bi 0.5 TiO 3 -0.1CaTiO 3 )-0.07Ba(Zr 0.05 Ti 0.95 )O 3 .

[0054] Preparation method and performance test:

[0055] (1) Choose anhydrous NaCO 3 、 Bi 2 o 3 , CaCO 3 、BaCO 3 , ZrO 2 and TiO 2 As the raw material, it is weighed according to the general composition formula, and then mixed by planetary wet ball milling process to obtain powder A (absolute ethanol is used as the ball milling medium, and the ball milling time is 4h); the dried powder A is placed in the muffle In the furnace, the temperature was raised from room temperature to 800 °C at a rate of 5 °C / min, and the temperature was kept for 2 hours. After the heat preservation, the porcelain powder was cooled to room temperature with the furnace; Deionized water is used as the ball milling medium, and the ball milling time is 4 hours);

[0056] (2) Add a binder to the powder ...

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Abstract

The invention provides solid solution-modified sodium bismuth titanate leadless piezoelectric ceramics and a preparation method thereof. The piezoelectric ceramics are represented by chemical composition general formula of (1-x)(0.74Na0.5Bi0.5TiO3-0.26SrTiO3)-xBa(Zr0.05Ti0.95)O3 or (1-y)(0.9Na0.5Bi0.5TiO3-0.1CaTiO3)-yBa(Zr0.05Ti0.95)O3, wherein 0.04<=x<=0.1 and 0.04<=y<=0.1. Solid solution of Ba(Zr0.05Ti0.95)O3 is realized at the morphotropic phase boundary of a 0.74Na0.5Bi0.5TiO3-0.26SrTiO3 and 0.9Na0.5Bi0.5TiO3-0.1CaTiO3 system, and high-density microcrystalline structure ceramics with uniform crystal grain size distribution are obtained by a two-step forming method and a self-bearing pressure sintering process. The piezoelectric property of the material is optimized by the morphotropic phase boundary composition characteristics and the solid solution modification method, and the piezoelectric constant d33 reaches 110-138 PC / N; the electromechanical coupling coefficient of the material is also increased obviously; the preparation process of the material is simple and stable, and the material is an optimal material for manufacturing low-power ultrasonic devices and energy transducers used in fields of gas sensors, industrial nondestructive test, and the like.

Description

technical field [0001] The invention belongs to the field of functional ceramics, in particular to solid-solution modified sodium bismuth titanate lead-free piezoelectric ceramics for low-power ultrasonic devices and transducers and a preparation method thereof. Background technique [0002] As an important class of functional materials, piezoelectric ceramics are widely used in various fields of medical treatment, communication, national defense, transportation, aviation and people's daily life. However, in the field of piezoelectric ceramics, the dominant lead zirconate titanate (PZT) accounts for about 70% of the total raw materials due to the toxic lead oxide (or PbO4) in its composition, causing a huge environmental pollution. Therefore, environmentally friendly lead-free piezoelectric ceramics with practical prospects have become one of the hot materials at home and abroad. [0003] At present, lead-free piezoelectric ceramic systems mainly include barium titanate-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
Inventor 杜慧玲王瑾史翔徐志蓬李艳霞
Owner XIAN UNIV OF SCI & TECH
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