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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still few practical applications, so it is imperative to develop new high-temperature lead-free piezoelectric ceramics

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] CaCO 3 , SrCO 3 、 Bi 2 o 3 、TiO 2 (analytical pure) as raw material, according to Sr 2-x Ca x Bi 4 Ti 5 o 18 Stoichiometric weighing, according to the conventional solid-phase synthesis method for batching, ball milling and mixing for 4 hours, drying, 850 ° C heat preservation for 2 hours pre-synthesis, fine grinding, drying, adding binder, molding, plastic discharge (850 ° C, time 2 hours), sintering at 1160°C for 2 hours, and the bismuth layered ceramic composite with the above formula is formed. Its main performance parameters are listed in Table 1. It can be seen from Table 1 that the samples composed around x=1 have higher comprehensive performance.

[0027] Table 1: (Sr 2-x Ca x ) Bi 4 Ti 5 o 18 Typical properties of samples

[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 ...

Embodiment 2

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

[0031] Table 2: Performance of samples 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

(℃)

572

670

721

650

coercive field

E. c (kV / cm)

60

52

52

52

remanent polarization

2P r (μC / cm 2 ) 18

16

17

14

Piezoelectric constant d 33 18 17 15 15

[0033] figure 1 It is a typical X-ray diffraction (XRD) spectrum of the high-temperature, high-frequency piezoelectric ceramic compound proposed by the present invention. It can be seen from this th...

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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

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Application Information

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