Lead-free piezoelectric ceramic material with high piezoelectricity and high electrogenerated strain and preparation method thereof

A lead-free piezoelectric and electro-strain technology is applied in the field of lead-free piezoelectric materials, which can solve the problems of high cost, difficult industrialization, and complicated preparation methods of textured processes, and can achieve high-voltage electrical coefficient and sintering temperature. The effect of wide area and high voltage

Active Publication Date: 2019-04-12
TONGJI UNIV
View PDF9 Cites 12 Cited by
  • 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 in Textured (K,Na)NbO 3 -Based Lead-FreeCeramics, 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lead-free piezoelectric ceramic material with high piezoelectricity and high electrogenerated strain and preparation method thereof
  • Lead-free piezoelectric ceramic material with high piezoelectricity and high electrogenerated strain and preparation method thereof
  • Lead-free piezoelectric ceramic material with high piezoelectricity and high electrogenerated strain 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, after adding binder, form and discharge sticky. Wherein ball milling is mixed, specifically with absolute ethanol as ball milling medium, the quality of zirconia ball is 1.5 times of powder gross weight, ball milling 24 hours. The temperature-rising program of pre-burning is to rise to 850 ℃ from room temperature with the temperature-rising rate of 3 degrees per minute and keep warm for 6 hours. Secondary ball milling specifically takes dehydrated alcohol as medium, and the quality of zirconia ball is 1.5 times of powder total mass, and ball milling time is 24 hours. The binder...

Embodiment 2

[0035] The sample prepared in Example 1 is sintered in a two-step sintering mode, and the sintering temperature of each component is 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 0.04 ...

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
piezoelectric charge coefficientaaaaaaaaaa
piezoelectric charge coefficientaaaaaaaaaa
Curie pointaaaaaaaaaa
Login to view more

Abstract

The invention relates to a lead-free piezoelectric ceramic material with high piezoelectricity and high electrogenerated strain and a preparation method thereof. The chemical composition of the material accords with the chemical general formula (1-x)(K0.5Na0.5)0.98Ag0.02(Nb0.96Sb0.04) O3-x (Bi0.5Na0.5) ZrO3, wherein x represents the percentage of (Bi0.5Na0.5) ZrO3 in the potassium-sodium niobate-based lead-free piezoelectric ceramic, and x is more than or equal to 0.01 and less than or equal to 0.06. Compared with the prior art, the preparation method has the advantages of simplicity, good stability and low cost. The lead-free piezoelectric ceramic material obtained by the preparation method has excellent piezoelectric performance and electrogenerated strain, the d33 reaches 440 pC / N, thed33* reaches 553 pm / V, good temperature stability is shown, and the lead-free piezoelectric ceramic material can be used for piezoelectric sensors, piezoelectric motors and high-precision displacementcontrollers, the material has 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 increasing awareness of environmental protection and the concept of sustainable development, the research...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap