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Tungsten bronze structure lead lanthanum niobate titanate high-temperature piezoelectric ceramic and preparation method thereof

A lanthanum niobate titanate, high-temperature piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problem of poor repeatability of the preparation process, difficulty in mass production, extreme The problems of reducing the chemical yield and other problems, to achieve the effect of simple preparation process, low cost, and reduced dielectric loss

Inactive Publication Date: 2010-06-02
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The piezoelectric ceramic material with the patent No. 93112369.0 has added rare earth elements, the cost of industrial production is too high, and the repeatability of the preparation process is not good; Rapid cooling, cooling rate > 100 ° C / min, cooling to room temperature, it is easy to cause cracking of the sample and reduce the yield of subsequent polarization, it is difficult to mass-produce under general industrial conditions

Method used

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  • Tungsten bronze structure lead lanthanum niobate titanate high-temperature piezoelectric ceramic and preparation method thereof
  • Tungsten bronze structure lead lanthanum niobate titanate high-temperature piezoelectric ceramic and preparation method thereof
  • Tungsten bronze structure lead lanthanum niobate titanate high-temperature piezoelectric ceramic and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Take the used raw material 100g of producing product of the present invention as example, when x is 0.045, y is 0.05, use general formula (Pb 0.955 La 0.03 )(Nb 0.95 Ti 0.0625 ) 2 o 6 The expressed raw materials and their weight proportions are:

[0038] PbO 44.36g

[0039] La 2 o 3 1.02g

[0040] Nb 2 o 5 52.55g

[0041] TiO 2 2.07g

[0042] Its preparation method is as follows:

[0043] 1. Ingredients synthesis

[0044] Put above-mentioned raw material in nylon tank, add dehydrated alcohol 200g to be dispersant, zirconia ball 150g is ball milling medium, the diameter of zirconia ball is 3~15mm, promptly raw material: dehydrated alcohol: the weight ratio of zirconia ball is 1:2:1.5, use a ball mill to grind for 17 hours at a speed of 300 rpm, separate the zirconia balls, put the mixture in a drying oven at 80°C, dry it for 5 hours, then put it in a mortar and grind for 25 minu...

Embodiment 2

[0058] Take the used raw material 100g of producing product of the present invention as example, when x is 0.015, y is 0.025, use general formula (Pb 0.985 La 0.01 )(Nb 0.975 Ti 0.03125 ) 2 o 6 Indicated raw materials and their weight ratio:

[0059] PbO 45.27g

[0060] La 2 o 3 0.34g

[0061] Nb 2 o 5 53.36g

[0062] TiO 2 1.03g

[0063] Its preparation method is as follows:

[0064] Put the raw materials into a nylon tank, add 200 g of absolute ethanol as a dispersant, and 150 g of zirconia balls as a ball milling medium. The other steps of this process step are the same as in Example 1. In step 2 of the pre-firing process, the ground material is pressed into a disc with a diameter of 20mm and a thickness of 15mm, placed in an alumina crucible, covered, and kept at 850°C for 4 hours in a muffle furnace. Cool to room temperature and remove from the oven. In step 3 of the...

Embodiment 3

[0066] Take the used raw material 100g of producing product of the present invention as example, when x is 0.06, y is 0.10, use general formula (Pb 0.94 La 0.04 )(Nb 0.9 Ti 0.125 ) 2 o 6 Indicated raw materials and their weight ratio:

[0067] PbO 44.12g

[0068] La 2 o 3 1.37g

[0069] Nb 2 o 5 50.31g

[0070] TiO 2 4.20g

[0071] Its preparation method is as follows:

[0072] Put the raw materials into a nylon tank, add 200 g of absolute ethanol as a dispersant, and 150 g of zirconia balls as a ball milling medium. The other steps of this process step are the same as in Example 1. In step 2 of the pre-firing process, the ground material is pressed into a disc with a diameter of 20 mm and a thickness of 15 mm, placed in an alumina crucible, covered, and kept at 1050 ° C for 2 hours in a muffle furnace. Cool to room temperature and remove from the oven. In ste...

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Abstract

The invention relates to a lead niobium titanate high-temperature piezoelectric ceramic with tungsten bronze structure, which has the general formula as follows: (Pb1-xLa2x / 3)(Nb1-yTi5y / 4)2O6, whereinx and y are atom numbers of constituent elements, x ranges from 0.015 to 0.06, and y ranges from 0.025 to 0.10. Also disclosed is a production method of the piezoelectric ceramic. The method comprises the following steps: material synthesis, prefiring, granulatin, blank molding, sintering, electrode application and high-voltage polarization. Experiments proved that: Compared with the prior art, the lead niobium titanate high-temperature piezoelectric ceramic with tungsten bronze structure has the advantages of simple production process, good repeatability, high yield, low cost, approximate Curie temperature and Kt to the similar ceramic, low dielectric loss, and improvements in piezoelectric constant (d33) and planar electromechanical coupling coefficient (Kp). The high-temperature piezoelectric ceramic can be used for the production of shells of vibration sensors and controllers, dynamic fuel injection nozzles, large-power ultrasonic devices, high-temperature high-frequency vibrometers, high-temperature flow meters, and high-temperature sensors.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to high-temperature and high-power piezoelectric devices or electrostrictive devices. Background technique [0002] High-temperature piezoelectric ceramic materials are widely used in many scientific research and industrial sectors such as aerospace, nuclear energy, automobiles, petrochemicals, metallurgy, power generation, and geological exploration. In the past ten years, with the rapid development of science and technology, many electronic devices have higher and higher requirements for the selected piezoelectric devices, and the scope of application and the use environment require piezoelectric materials to have greater adaptability. At present, there are very few high-temperature piezoelectric ceramic materials with excellent performance and a service temperature higher than 400 °C. For a long time, piezoelectric single crystal materials [Materials Herald, 1998, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622H01L41/187H10N30/853
Inventor 刘鹏王波门高丽
Owner SHAANXI NORMAL UNIV
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