Piezoelectric ceramic complexes

A technology of piezoelectric ceramics and composites, applied in circuits, piezoelectric/electrostrictive/magnetostrictive devices, electrical components, etc., to achieve the effect of small dielectric constant-temperature coefficient and high temperature stability

Inactive Publication Date: 2009-03-18
LIAOCHENG UNIV
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still few practical applications, so it is impera

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
  • Piezoelectric ceramic complexes
  • Piezoelectric ceramic complexes
  • Piezoelectric ceramic complexes

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1:

[0026] Take CaCO 3 , SrCO 3 , Bi 2 O 3 , TiO 2 (Analytical pure) as raw material, press Sr 2-x Ca x Bi 4 Ti 5 O 18 The stoichiometric weighing is carried out according to the conventional solid phase synthesis method, the ball milling is mixed for 4 hours, dried, and the temperature is kept at 850℃ for 2 hours. Hours), sintering and holding at 1160°C for 2 hours to form the bismuth layered ceramic composite with the above formula. Its main performance parameters are listed in Table 1. It can be seen from Table 1 that the samples composed near x=1 have higher overall performance.

[0027] Table 1: (Sr 2-x Ca x )Bi 4 Ti 5 O 18 Typical performance of the sample

[0028] x 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Density (g / cm 3 ) 6.50 6.53 6.51 6.42 6.4 6.31 6.35 6.33 % Theoretical density 90 91 91 91 91 90 91 92 ε 33 T (100kHz) 390 280 300 260 270 260 300 170 tanδ(100kHz) 0.02 0.015 0.01 0.007 0.007 0.005 ...

Example Embodiment

[0029] Example 2:

[0030] Take the composition of x=1, y=0.1-0.4, and add different contents of MnCO 3 The sintering temperature is 1150°C, and the others are the same as in Example 1. The properties are listed in Table 2.

[0031] Table 2: Performance of the sample after doping (x=1)

[0032] y 0.1 0.2 0.3 0.4 Density (g / cm 3 ) 6.53 6.50 6.49 6.40 % Theoretical density 91 90 91 89 ε 33 T (100kHz) 174 240 215 190 tanδ(100kHz) 0.015 0.01 0.01 0.01 Curie temperature T C

[0033] figure 1 It is a typical X-ray diffraction (XRD) pattern of the high-temperature, high-frequency piezoelectric ceramic composite proposed by the present invention. It can be seen that the crystal structure of this material is a 5-layer Aurigillius structure, and the unit cell parameter c is much larger than the crystal structure. The cell parameters a, b, and the cell parameters a, b are close, so this material has a large anisotropy; in the polarizat...

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

No PUM Login to view more

Abstract

The invention relates to a ceramic composite with a bismuth layer structure with good comprehensive performance in high-temperature piezoelectricity, dielectric and so on. The chemical formula of the ceramic composite is (Sr2-xCax)1-yMyBi4Ti5O18, wherein M can be one or more of Mn, Ba, Ce, Pb and other elements; x is more than or equal to 0 and is less than or equal to 2, and y is more than or equal to 0 and is less than or equal to 1. The composite has good performance when x is equal to 1 and y is equal to 0, and the Curie temperature is more than or equal to 570 DEG C. At room temperature, piezoelectric constant d33 is more than or equal to 22pC.N<-1>; d33 is more than 17pC.N<-1> at a temperature of 550 DEG C, and 80 percent of the piezoelectric activity is still maintained. From room temperature to 550 DEG C, the dielectric loss of the composite in 100 kHz is less than or equal to 0.07, and the dielectric loss of the composite in 1MHz is less than or equal to 0.02, and the specific inductive capacity-temperature coefficient is small. The ceramic composite can fulfill the application in steel, chemical engineering, energy, aerospace engineering and other industrial fields.

Description

technical field [0001] The invention belongs to the field of high-temperature and high-frequency lead-free piezoelectric ceramic materials, in particular to a kind of piezoelectric ceramic compound with better high-temperature piezoelectric performance. Background technique [0002] Since Jaffe discovered the high-voltage properties of PZT piezoelectric ceramics in 1958, PZT materials have become a widely used piezoelectric ferroelectric material, but the main disadvantage of PZT materials is that during the preparation and waste treatment, due to the lead Exist and cause environmental pollution (Taro Asai, Emerson R. Camargo, Masato Kakihana, Minoru Osada, A novelAqueous solution route to the low-temperature synthesis of SrBi 2 Nb 2 o 9 by use of water-soluble Bi and Nb complexes [J]. J. Alloys Compd. 2000, 309: 113-117.). It is for this reason that it is more and more urgent to develop lead-free piezoelectric ceramics to replace lead-containing piezoelectric ceramics, ...

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
IPC IPC(8): C04B35/462H01L41/187
Inventor 徐志军初瑞清郝继功李伟付鹏
Owner LIAOCHENG 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