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Bismuth sodium titanate based leadless piezoelectric ceramic and preparation technique thereof

A sodium bismuth titanate-based, lead-free piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve application limitations, high production costs, process equipment and process stability It can meet the practical requirements, low cost, and superior performance.

Inactive Publication Date: 2009-06-24
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these preparation technologies are still in the exploratory stage, and the production cost is high, and the process equipment and process stability are not ideal, which greatly limits their application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Analytical pure anhydrous Na 2 CO 3 、 Bi 2 o 3 、BaCO 3 , Nb 2 o 5 and TiO 2 As raw material, according to the general formula 0.9 (Na 0.5 Bi 0.5 ) 0.94 Ba 0.06 TiO 3 -0.1NaNbO 3 The stoichiometric ratio is used for batching, and the batching and absolute ethanol are mixed at a mass ratio of 1:1, then ball milled on a planetary mill for 4 hours, and then dried, and the dried powder is kept at 800°C for 2 hours for pre-synthesis, and the pre-synthesis Add deionized water to the final powder for secondary ball milling for 4 hours, add 5% polyvinyl alcohol aqueous solution to granulate after drying, dry press the powder into a disc, and then perform isostatic pressing for secondary molding. The green disc was sintered at 1160°C, kept warm for 2 hours and then cooled with the furnace, and the sintered ceramics were polarized by silver electrodes in a silicone oil bath at 160°C. The polarization voltage is 3KV / mm, and the polarization time is 15min.

[0022] The...

Embodiment 2

[0026] Analytical pure anhydrous Na 2 CO 3 、 Bi 2 o 3 、BaCO 3 , Nb 2 o 5 and TiO 2 as the raw material, the composition expression is 0.8(Na 0.5 Bi 0.5 ) 0.94 Ba 0.06 TiO 3 -0.2NaNbO 3, mix the ingredients and absolute ethanol at a mass ratio of 1:1, ball mill on a planetary mill for 4 hours, and then dry. Pre-synthesize the dried powder at 800°C for 2 hours. Add the pre-synthesized powder to Secondary ball milling with ion water for 4 hours, after drying, add 5% polyvinyl alcohol aqueous solution to granulate, dry press the powder into a disc and then perform isostatic pressing for secondary molding. Sintering is carried out in the temperature range, and after holding for 2 hours, it is cooled with the furnace, and the sintered ceramics are polarized by silver electrodes in a silicone oil bath at 160°C. The polarization voltage is 3KV / mm, and the polarization time is 15min.

[0027] The measured performance is as follows:

[0028] ε r tanδ d 33 (PC / N)...

Embodiment 3

[0031] Analytical pure anhydrous Na 2 CO 3 、 Bi 2 o 3 , SrCO 3 , Nb 2 o 5 and TiO 2 as the raw material, the composition expression is 0.9(Na 0.5 Bi 0.5 ) 0.74 Sr 0.26 TiO 3 -0.1NaNbO 3 , mix the ingredients and absolute ethanol at a mass ratio of 1:1, ball mill on a planetary mill for 4 hours, and then dry. Pre-synthesize the dried powder at 800°C for 2 hours. Add the pre-synthesized powder to Secondary ball milling with ion water for 4 hours, after drying, add 5% polyvinyl alcohol aqueous solution to granulate, dry press the powder into a disc and then carry out isostatic pressing for secondary molding. Sintering is carried out in the temperature range, and after holding for 2 hours, it is cooled with the furnace, and the sintered ceramics are polarized by silver electrodes in a silicone oil bath at 160°C. The polarization voltage is 3.5KV / mm, and the polarization time is 15min.

[0032] The measured performance is as follows:

[0033] ε r tanδ d 33 ...

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Abstract

The invention discloses a sodium bismuth titanate based lead-free piezoelectric ceramic and a preparation process thereof. The general formula of the piezoelectric ceramic composition is (1-x)(Na0.5Bi0.5)1-aMaTiO3-xNaNbO3, wherein, x is the mol content of NaNbO3 in a ceramic system, a is the atom number of composite ions (Na0.5Bi0.5) which are replaced by M in (Na0.5Bi0.5)TiO3, x is not less than 0 but less than 0.3, a is more than 0 but less than 0.3, and M represents divalent alkaline earth metal elements Ba, Sr and Ca. As a secondary isostatic pressing forming method is adopted in the preparation process, the piezoelectric ceramic has the advantages of simple operation, high stability and low cost; and the method helps easily obtain high-density microcrystal ceramic materials, obviously improve the piezoelectric parameter and electromechanical coupling factor of the materials, and meet the practical requirement of the piezoelectric ceramic materials used in a micro-displacement actuator.

Description

technical field [0001] The invention belongs to the field of environment-friendly piezoelectric ceramics, in particular to bismuth sodium titanate-based lead-free piezoelectric ceramics and a preparation process thereof. Background technique [0002] Piezoelectric ceramics are the most widely used and mature category of piezoelectric materials. However, in the field of piezoelectric ceramics, lead zirconate titanate (PZT) has dominated for a long time, and the toxic lead oxide (or lead tetraoxide) in PZT ceramics accounts for about 70% of the total raw materials. Such a high lead The content will bring harm to the environment and human beings in the process of preparation, use and recycling. With the sustainable development of human society and the emphasis on environmental protection, the development of lead-free environmentally compatible piezoelectric ceramics is an urgent and practically significant topic. [0003] Sodium bismuth titanate (Na 0.5 Bi 0.5 )TiO 3 (NBT)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622H01L41/187
Inventor 杜慧玲王婷史翔
Owner XIAN UNIV OF SCI & TECH
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