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Piezoelectricity, high electrostrain lead-free piezoelectric ceramic material and preparation method thereof

A lead-free piezoelectric and electrostrain technology, which is applied in the field of lead-free piezoelectric materials, can solve problems such as difficult industrialization, high cost, and complicated preparation methods of textured processes, and achieve good piezoelectric performance and temperature stability properties, wide sintering temperature range, and good temperature stability

Active Publication Date: 2021-12-31
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Texturing technology can effectively improve the piezoelectric performance of potassium sodium niobate-based piezoelectric ceramics, and can also improve its temperature stability. Peng Li, Jiwei Zhai and others made a breakthrough in 2017 by using texturing technology (P .Li,J.W.Zhai,B.Shen,S.J.Zhang,X.L.Li,F.Y.Zhu,X.M.Zhang,Ultrahigh Piezoelectric Properties inTextured(K,Na)NbO 3 -Based Lead-Free Ceramics, Adv.Mater.30 (2018) 1705171), but the preparation method of the texturing process is very complicated, the cost is high, and it is difficult to realize industrialization

Method used

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  • Piezoelectricity, high electrostrain lead-free piezoelectric ceramic material and preparation method thereof
  • Piezoelectricity, high electrostrain lead-free piezoelectric ceramic material and preparation method thereof
  • Piezoelectricity, high electrostrain lead-free piezoelectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] According to (1-x)(K 0.5 Na 0.5 ) 0.98 Ag 0.02 (Nb 0.96 Sb 0.04 )O 3 -x(Bi 0.5 Na 0.5 ) ZrO 3 The stoichiometric ratio of Na, K, Ag, Nb, Sb, Bi and Zr elements in the medium is accurately weighed, and the raw material is Na 2 CO 3 、K 2 CO 3 、Ag 2 O, Nb 2 o 5 , Sb 2 o 3 、Bi 2 o 3 and ZrO 2 , Mix the weighed raw materials by ball milling, pre-calcining, secondary ball milling, add binder, form and discharge sticky. Wherein, ball milling is used for mixing, specifically, anhydrous ethanol is used as a ball milling medium, and the mass of zirconia balls is 1.5 times of the total weight of the powder, and ball milling is performed for 24 hours. The heating program for pre-burning is to rise from room temperature to 850° C. and keep warm for 6 hours at a heating rate of 3 degrees per minute. The secondary ball milling specifically uses absolute ethanol as the medium, the mass of the zirconia balls is 1.5 times the total mass of the powder, and the ball mi...

Embodiment 2

[0035] The sample prepared in Example 1 was sintered in a two-step sintering manner, and the sintering temperature of each component was optimized. (1-x)(K 0.5 Na 0.5 ) 0.98 Ag 0.02 (Nb 0.96 Sb 0.04 )O 3 -x(Bi 0.5 Na 0.5 ) ZrO 3 , x=0.04 The optimal sintering condition for ceramics is to raise the temperature to 900°C at a rate of 5°C / min, then to 1190°C at a rate of 3°C / min, and then rapidly drop to 10°C / min. 1090°C, then keep warm for 3 hours.

[0036] figure 1 is the d of the lead-free piezoelectric ceramic material prepared in Example 2 33 Trend chart, from the figure we can see that (1-x)(K 0.5 Na 0.5 ) 0.98 Ag 0.02 (Nb 0.96 Sb 0.04 )O 3 -x(Bi 0.5 Na 0.5 ) ZrO 3 , x = 0.04 ceramic d 33 Up to 440pC / N, which is superior to most other KNN-based ceramics.

[0037] figure 2 is the XRD spectrum of the lead-free piezoelectric ceramic material prepared in Example 2. It can be seen from the figure that (1-x)(K 0.5 Na 0.5 ) 0.98 Ag 0.02 (Nb 0.96 Sb 0...

Embodiment 3

[0043] Piezoelectricity, high electrostrain lead-free piezoelectric ceramic material, the chemical composition of the material conforms to the general chemical formula 0.99(K 0.5 Na 0.5 ) 0.98 Ag 0.02 (Nb 0.96 Sb 0.04 )O 3 -0.01 (Bi 0.5 Na 0.5 ) ZrO 3 , the above materials were prepared by the following method:

[0044] (1) Using Na 2 CO 3 、K 2 CO 3 、Ag 2 O, Nb 2 o 5 , Sb 2 o 3 、Bi 2 o 3 and ZrO 2 As raw materials, weigh the above components according to the stoichiometric ratio of Na, K, Ag, Nb, Sb, Bi and Zr elements in the formula, and then sequentially undergo ball milling, pre-calcination, and secondary ball milling, and add polyvinyl alcohol as a binder , molding, and debonding procedures, wherein, during ball milling and secondary ball milling, absolute ethanol is used as the ball milling medium, the quality of zirconia balls is 1.5 times the total weight of the powder, ball milling is 24 hours, and pre-calcination is carried out at 3°C / The heating...

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Abstract

The present invention relates to lead-free piezoelectric ceramic material and preparation method thereof of piezoelectric property, high electric strain, and the chemical composition of this material accords with general chemical formula (1-x) (K 0.5 Na 0.5 ) 0.98 Ag 0.02 (Nb 0.96 Sb 0.04 )O 3 -x(Bi 0.5 Na 0.5 ) ZrO 3 , where x represents (Bi 0.5 Na 0.5 ) ZrO 3 The percentage of potassium sodium niobate-based lead-free piezoelectric ceramics, and 0.01≤x≤0.06. Compared with the prior art, the preparation method of the invention is simple, good in stability and low in cost. The lead-free piezoelectric ceramic material obtained by the preparation method has excellent piezoelectric properties and electric strain, and its d 33 reached 440pC / N,d 33 * It reaches 553pm / V, and shows good temperature stability. It can be used in piezoelectric sensors, piezoelectric motors and high-precision displacement controllers, etc., and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of lead-free piezoelectric materials, in particular to a lead-free piezoelectric ceramic material with high piezoelectricity, high electrical strain and good temperature stability and a preparation method thereof. Background technique [0002] Piezoelectric materials play an important role in functional devices such as electricity, magnetism, force, and heat because they can realize the mutual conversion of mechanical energy and electrical energy. Lead zirconate titanate (Pb(Ti,Zr)O 3 , PZT), has become the most widely used piezoelectric material due to its excellent comprehensive properties. However, lead is volatile in high temperature environment, and lead-containing materials will bring a huge burden to the environment and seriously threaten human health in the process of preparation and disposal. Due to the continuous popularization of environmental protection awareness and sustainable development concepts, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/64
CPCC04B35/495C04B35/622C04B35/64C04B2235/3201C04B2235/3298C04B2235/3244C04B2235/3294C04B2235/3291C04B2235/661C04B2235/6567C04B2235/6565C04B2235/6562
Inventor 沈波杨伟伟翟继卫
Owner TONGJI UNIV
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