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A kind of high temperature piezoelectric ceramic material and preparation method thereof

A technology of piezoelectric ceramics and ceramic materials, which is applied in the field of piezoelectric ceramics with high Curie temperature and its preparation, can solve the problems of high price, the comprehensive electrical performance cannot meet the requirements of device use at the same time, etc., and achieves low preparation cost and low dielectric. The effect of loss

Inactive Publication Date: 2016-08-24
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems that existing piezoelectric ceramic materials are difficult to obtain high Curie temperature and high-voltage electrical properties at the same time, the comprehensive electrical properties cannot meet the requirements of device use at the same time, or the price is expensive, etc., the present invention provides a high Curie temperature, relatively high piezoelectric ceramic material. New doped low-cost high-temperature piezoelectric ceramic material with greatly improved coefficient and mechanical quality factor, adjustable within a certain range and low dielectric loss

Method used

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  • A kind of high temperature piezoelectric ceramic material and preparation method thereof
  • A kind of high temperature piezoelectric ceramic material and preparation method thereof
  • A kind of high temperature piezoelectric ceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Bi 2 o 3 , Yb 2 o 3 , Pb 3 o 4 、TiO 2 , ZrO 2 and MnCO 3 Press (BiYb) 0.07 Pb 0.93 Ti 0.49 Zr 0.44 o 3 ++Weigh the molar ratio of 1mol% Mn, add anhydrous ethanol medium to mix and ball mill, dry and sieve, pre-calcine at 750°C for 2h. The pre-fired block is then ball milled, dried and granulated with 5% PVA, aged for 6 hours, sieved and pressed into a green body with a diameter of 15mm and a thickness of about 1.5mm, and sintered at 1120°C for 2.5h. The obtained sample was ground, polished, silvered, and polarized in 160°C silicone oil with an electric field of 4kV / mm for 20 minutes, and the required ceramic sample was prepared after cooling down. The comprehensive electrical properties obtained from the test were: d 33 =213pC / N, T c =395°C, Q m =356, tanδ=0.002.

Embodiment 2

[0027] Bi 2 o 3 , Yb 2 o 3 , Pb 3 o 4 、TiO 2 , ZrO 2 and Nb 2 o 5 Press (BiYb) 0.06 Pb 0.94 Ti 0.5 Zr 0.44 o 3 ++ 0.2mol% Nb molar ratio weighing, adding water medium to mix and ball mill, drying and sieving, pre-calcined at 750°C for 2h. Ball mill the pre-fired block, dry it, add 6% PVA to granulate, age for 6 hours, press it into a green body with a diameter of 15mm and a thickness of about 1.5mm after sieving, and sinter at 1150°C for 3 hours to obtain After the sample is polished, polished, and silvered, it is polarized in 160°C silicone oil with an electric field of 4kV / mm for 10 minutes, cooled to 110°C and then polarized for 10 minutes to make a ceramic sample. The comprehensive electrical properties obtained from the test are: d 33=213pC / N, T c =390°C, Q m =156, tanδ=0.011.

Embodiment 3

[0029] Bi 2 o 3 , Yb 2 o 3 , Pb 3 o 4 、TiO 2 , ZrO 2 and Cr 2 o 3 Press (BiYb) 0.05 Pb 0.95 Ti 0.5 Zr 0.45 o 3 ++0.2mol%Cr molar ratio weighing, adding water medium to mix ball milling, drying and sieving, pre-calcined at 800°C for 2h. Ball mill the pre-fired block, dry it, add 5% PVA to granulate, age for 6 hours, press it into a green body with a diameter of 15mm and a thickness of about 1.5mm after sieving, and sinter at 1150°C for 3 hours to obtain After the sample is polished, polished, and silvered, it is polarized in 160°C silicone oil with an electric field of 4kV / mm for 10min to prepare a ceramic sample. The comprehensive electrical properties obtained from the test are: d 33 =220pC / N,T c =401°C, Q m =180, tanδ=0.001.

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Abstract

The invention discloses a high Curie temperature piezoelectric ceramic, the piezoelectric ceramic has the general formula (BiYb) 1‑x Pb x Ti y Zr x‑y o 3 +zmol%A, where x=0.91~0.98, y=0.45~0.68, z=0.05~5, A is a modifying element. The present invention also provides a method for preparing the piezoelectric ceramic, the piezoelectric ceramic prepared by the method has a higher Curie temperature, a higher piezoelectric constant, a lower dielectric loss, a higher electromechanical coupling coefficient and A wide range of variable mechanical quality factors, etc., and overcome the problems that existing piezoelectric materials are difficult to have high Curie temperature and high piezoelectric performance at the same time, and the comprehensive electrical parameters cannot meet the requirements of specific piezoelectric devices. The invention has the characteristics of simple and stable process, no need of special equipment, low cost, convenient large-scale industrial production, etc., and can be used for corresponding various high-temperature piezoelectric devices.

Description

technical field [0001] The invention relates to the field of electronic ceramics and piezoelectric devices, in particular to a piezoelectric ceramic with a high Curie temperature and a preparation method thereof. Background technique [0002] The development of modern industry has put forward higher requirements for the high-temperature environment operation of various acoustic transducers and vibration sensors, which requires the piezoelectric materials used in these devices to have a higher Curie temperature (T c ). For example, acoustic logging transducers used in oil wells, piezoelectric actuators and sensors used in spacecraft, fuel injection nozzle drivers, and various sensors used in other extreme environments all require T c Piezoelectric ceramics above 380°C or even higher. The T of the most commonly used piezoelectric ceramic lead zirconate titanate (PZT) c Generally much lower than 360°C. Because of the degradation of piezoelectric properties caused by the gra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/491C04B35/622
Inventor 郭栋王云丽蔡锴
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI