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Thermally stable leadless high temperature piezoelectric ceramic and preparing method thereof

A high-temperature piezoelectric and thermally stable technology, applied in the field of piezoelectric ceramic materials and their preparation, thermally stable lead-free high-temperature piezoelectric ceramics and their preparation, can solve the problem of insufficient temperature stability of piezoelectric and electromechanical properties and poor electrical properties. To give full play to the problems of potassium and sodium stoichiometry deviation, to achieve excellent piezoelectric coefficient, good temperature stability, mechanical properties and good moisture resistance characteristics

Inactive Publication Date: 2008-08-06
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of ceramic is difficult to sinter under the conventional preparation process, and it is easy to be hydrolyzed, so that its electrical properties cannot be fully exerted
Although the piezoelectric properties have been effectively improved by various doping modifications, the current process repeatability of this type of ceramics is poor, potassium and sodium are easily volatile, resulting in stoichiometric deviations, low mechanical strength, and poor piezoelectric and electromechanical properties. Insufficient temperature stability
Through doping modification, although the piezoelectric properties can be improved to a certain extent, these dopants seriously reduce the Curie temperature of the material.
[0006] To sum up, there are still many gaps in the comprehensive performance of lead-free piezoelectric ceramics compared with lead-containing piezoelectric ceramics.
Especially in the field of high-temperature lead-free piezoelectric ceramics, there is still a lack of piezoelectric ceramic compositions with high Curie point and thermal stability.
On the basis of alkali metal niobate, through the doping of various components, to obtain low-temperature sinterable, thermally stable lead-free high-temperature piezoelectric ceramic composition, the research on the electrical properties and preparation process is still rarely reported

Method used

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  • Thermally stable leadless high temperature piezoelectric ceramic and preparing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: Carry out each step successively according to above-mentioned embodiment mode, wherein

[0041] In step 1, values ​​are selected according to a=0.47, b=0.43, c=0.06, d=0.035, e=0.005, u=0.96, v=0.04, x=0, y=0. The expression of composition is: (Na 0.47 K 0.43 Li 0.06 Ag 0.035 Bi 0.005 )(Nb 0.96 Ta 0.04 )O 3

[0042] In step 2, the calcination temperature is 900°C, and the calcination time is 5h;

[0043] In step 3, the sintering temperature is 1070°C, and the sintering time is 3h;

[0044] The scanning electron micrograph of the natural surface of the sample obtained is shown in Figure 1, and other relevant properties are shown in Table 1:

[0045] Table 1

[0046] Density (g / cm 2 )

Embodiment 2

[0047] Embodiment 2: Carry out each step successively according to above-mentioned embodiment mode, wherein

[0048] In step 1, values ​​are selected according to a=0.47, b=0.43, c=0.06, d=0.035, e=0.005, u=0.96, v=0.04, x=0.3%, y=0.2%. The expression of composition is: (Na 0.47 K 0.43 Li 0.06 Ag 0.035 Bi 0.005 )(Nb 0.96 Ta 0.04 )O 3 +0.3wt%MgTiO 3 +0.2wt%CuO

[0049] In step 2, the calcination temperature is 850°C, and the calcination time is 5h;

[0050] In step 3, the sintering temperature is 1050°C, and the sintering time is 3h;

[0051] The piezoelectric coefficient d of the obtained lead-free piezoelectric ceramic sample 33 and the electromechanical coupling coefficient k p The temperature dependence is shown in Figure 2, and other related properties are shown in Table 2:

[0052] Table 2

[0053] Density (g / cm 2 )

Embodiment 3

[0054] Embodiment 3: Carry out each step successively according to above-mentioned embodiment mode, wherein

[0055] In step 1, values ​​are selected according to a=0.47, b=0.43, c=0.06, d=0.035, e=0.005, u=0.96, v=0.04, x=0.4%, y=0.2%. The expression of composition is: (Na 0.47 K 0.43 Li 0.06 Ag 0.035 Bi 0.005 )(Nb 0.96 Ta 0.04 )O 3 +0.4wt%CaTiO 3 +0.2wt%CuO

[0056] In step 2, the calcination temperature is 850°C, and the calcination time is 5h;

[0057] In step 3, the sintering temperature is 1060°C, and the sintering time is 3h;

[0058] The relevant properties of the prepared lead-free piezoelectric ceramic samples are shown in Table 3:

[0059] table 3

[0060] Density (g / cm 2 )

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Abstract

The invention discloses a thermally stable lead-free high-temperature piezoelectric ceramic and a preparation method thereof, which is characterized in that the thermally stable lead-free high-temperature piezoelectric ceramic consists of components expressed by the following general formulas: (Naa Kb Lic Agd Bie) (Nbu Tay) O3 +xM1 +yM2, M1 is titanate of the following metals: Mg, Ca, Ba and Sr; M2 is the carbonate or oxide of the following metals: Na, K, Li, A1, Cu, Fe, Mn, Zn, Pr, Nd, Sm, Gd, La, Dy, Er, Yb, Sc and Sb; x and y are the percentages for which the weights of M1 and M2 account in the overall weight of raw materials. The lead-free high-temperature piezoelectric ceramic of the invention is a lead-free, environmentally coordinative, high-temperature piezoelectric ceramic with low agglomerating temperature, high curie temperature, stable thermal performance of electricity, and high mechanical strength, and has stable preparation technique and can be obtained by adopting the preparation technique and industrial materials for traditional piezoelectric ceramics, so the invention is practical.

Description

1. Technical field [0001] The invention relates to a functional ceramic material and a preparation method thereof, in particular to a piezoelectric ceramic material and a preparation method thereof, in particular to a thermally stable lead-free high-temperature piezoelectric ceramic and a preparation method thereof. 2. Background technology [0002] Piezoelectric ceramics are an important class of functional ceramic materials. However, the piezoelectric ceramic materials that have been widely used for many years are mainly based on lead zirconate titanate (Pb(Zr,Ti)O 3 ) or lead titanate (PbTiO 3 , referred to as PT) as the main component. The content of lead oxide or lead tetraoxide accounts for more than 60% of the raw material. These lead-containing piezoelectric ceramics will bring serious harm to human health and the living environment during use and disposal. The development of lead-free and environmentally compatible piezoelectric ceramics is an urgent and practica...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/468C04B35/47C04B35/465C04B35/01C04B35/64
Inventor 左如忠付健苏石叶纯
Owner HEFEI UNIV OF TECH
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