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High-temperature leadless piezoelectric ceramic with spontaneous piezoelectricity and preparation method thereof

A piezoelectric performance, lead-free piezoelectric technology, applied in the field of piezoelectric ceramic materials, can solve the problems of piezoelectric material temperature limitation, ferroelectric performance reduction, temperature dependence, etc., achieve good stability, simple preparation process, good The effect of applying the foreground

Active Publication Date: 2014-10-22
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-temperature high-performance piezoelectric materials mainly use ferroelectric materials, and the ferroelectric properties decrease significantly with the increase of temperature, resulting in a very obvious temperature dependence of piezoelectric properties.
At the same time, the application of piezoelectric materials in the field of high temperature is strongly limited by the temperature of ferroelectric properties.
There is no high-temperature lead-free piezoelectric ceramic K with spontaneous piezoelectric properties. 1 / 2 Na 1 / 2 NbO 3 -Me 2 Ti 2 o 7 (Me is a trivalent rare earth metal element) report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The composition is: (1- x ) K 1 / 2 Na 1 / 2 NbO 3 - x Nd 2 Ti 2 o 7 ,in x =0.5.

[0018] The preparation method comprises the following steps:

[0019] To analyze pure K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 、Nd 2 o 3 and TiO 2 As raw material, according to the following chemical formula (1- x ) K 1 / 2 Na 1 / 2 NbO 3 - x Nd 2 Ti 2 o 7 ( x =0.5) for batching, using absolute ethanol as the medium for ball milling for 24 hours, drying and pre-sintering at 990 °C for 6 hours to form a powder.

[0020] The synthesized powder is wet-milled for 24 hours for the second time with absolute ethanol as the medium, and after drying, it is granulated by adding a PVA solution with a concentration of 6% (weight percentage), and pressed into shape; On the setter plate, the silicon-molybdenum rods heated by electric furnace sintering are placed under the corundum setter plate, and the silicon-molybdenum rods are not heated in other directions of the electric furnace. The bo...

Embodiment 2

[0024] The composition is: (1- x ) K 1 / 2 Na 1 / 2 NbO 3 - x La 2 Ti 2 o 7 ,in x =0.5.

[0025] The preparation method is the same as in Example 1, except that the sintering temperature is 1380°C.

[0026] The performance is shown in Table 1.

Embodiment 3

[0028] The composition is: (1- x ) K 1 / 2 Na 1 / 2 NbO 3 - x SM 2 Ti 2 o 7 ,in x =0.5.

[0029] The preparation method is the same as in Example 1, except that the sintering temperature is 1330°C.

[0030] The performance is shown in Table 1.

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PUM

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Abstract

The invention discloses a high-temperature leadless piezoelectric ceramic with spontaneous piezoelectricity and a preparation method thereof. The composition is represented by the chemical formula (1-x)K1 / 2Na1 / 2NbO3-xNd2Ti2O7 or (1-x)K1 / 2Na1 / 2NbO3-xLa2Ti2O7 or (1-x)K1 / 2Na1 / 2NbO3-xSm2Ti2O7 or (1-x)K1 / 2Na1 / 2NbO3-xPr2Ti2O7, wherein x represents mole fraction, and is greater than 0 and less than 0.8. The leadless piezoelectric ceramic is prepared by a conventional ceramic preparation technique. The preparation method comprises the following steps: holding a thick burning plate, quickly taking out, and covering a steel plate on the surface for quick cooling. The cooling temperature difference between the upper and lower surfaces of the ceramic sample is regulated to generate the spontaneous piezoelectricity. The ceramic material is simple in technique and does not need any high electric field for polarization; the piezoelectricity is free from the restriction of the polarization temperature of the ferroelectric material, so the ceramic has favorable high-temperature stability; the depolarization temperature Td is greater than 700 DEG C; and the ceramic is green and environment-friendly.

Description

technical field [0001] The invention relates to a piezoelectric ceramic material, in particular to a high-temperature lead-free piezoelectric ceramic with spontaneous piezoelectric performance and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are functional materials that convert mechanical energy to electrical energy, and are widely used in various electronic components such as filters, drivers, resonators, sensors, chewers, and ultrasonic transducers. In particular, high-temperature piezoelectric materials are widely used in vibration and shock measurements in aerospace, machinery, construction, automotive and other industries. With the development of atomic energy, aerospace, automobile, metallurgy and petrochemical industries, the requirements for reliability and noise reduction are required, and piezoelectric materials are required to continuously challenge the limit of high temperature operation. However, high-temperature and high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/50C04B35/622
Inventor 周昌荣曾卫东周秀娟杨华斌周沁陈国华袁昌来
Owner GUILIN UNIV OF ELECTRONIC TECH