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Bismuth scandate-lead titanate-bismuth ferrite ternary system piezoelectric ceramic and acoustic emission sensor thereof

An acoustic emission sensor and ceramic technology, which is applied in the field of high temperature sensing, can solve the problem that the solid solution cannot meet the high temperature service environment of 300 ° C, and achieve the effect of excellent piezoelectric performance.

Active Publication Date: 2021-03-26
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the BiScO3-PbTiO3 solid solution still cannot meet the high temperature service environment of 300℃
The high-temperature piezoelectric ceramic material represented by bismuth ferrite (BiFeO3) has a high Curie temperature (TC=825℃ ), but the relatively small piezoelectric constant (d33=27pC / N) limits its application

Method used

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  • Bismuth scandate-lead titanate-bismuth ferrite ternary system piezoelectric ceramic and acoustic emission sensor thereof
  • Bismuth scandate-lead titanate-bismuth ferrite ternary system piezoelectric ceramic and acoustic emission sensor thereof
  • Bismuth scandate-lead titanate-bismuth ferrite ternary system piezoelectric ceramic and acoustic emission sensor thereof

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Effect test

Embodiment 1

[0046] High-temperature piezoelectric ceramic sheets are used as piezoelectric elements, and the content of Al 2 o 3 99% Al with a diameter of 18 mm and a thickness of 1 mm 2 o 3 The ceramic is the sound-transmitting layer, the silver powder conductive adhesive is the high-temperature conductive adhesive and binder, the Pt metal layer is the upper and lower electrode layers of the chip, and the porous ZrO 2 for sound-absorbing materials.

[0047] Among them, the ceramic is 0.33Bi 0.991 La 0.009 ScO 3 -0.62PbTiO 3 -0.05Bi 0.999 La 0.001 Fe 0.95 Ga 0.05 o 3 -1mol%Mn high temperature piezoelectric ceramics. With analytically pure raw material Bi 2 o 3 、Sc 2 o 3 , PbO, TiO 2 , La 2 o 3 , Fe 2 o 3 , Ga 2 o 3 , MnO 2 According to the stoichiometric ratio of ingredients, add ethanol, the amount of ethanol added is 25mL / 10g of the mixture, put it into a ball mill jar and mill it for 24 hours to mix evenly; after mixing evenly, put the mixture in an oven and dry...

Embodiment 2

[0051] High-temperature piezoelectric ceramic sheets are used as piezoelectric elements, and the content of Al 2 o 3 99% Al with a diameter of 18 mm and a thickness of 1 mm 2 o 3 The ceramic is the sound-transmitting layer, the silver powder conductive adhesive is the high-temperature conductive adhesive and binder, the Pt metal layer is the upper and lower electrode layers of the chip, and the porous ZrO 2 It is a high-temperature sound-absorbing material.

[0052] Among them, the ceramic is 0.3Bi 0.992 La 0.008 ScO 3 -0.6PbTiO 3 -0.1Bi 0.998 La 0.002 Fe 0.95 Ga 0.05 o 3 -1mol%Mn high temperature piezoelectric ceramics. With analytically pure raw material Bi 2 o 3 、Sc 2 o 3 , PbO, TiO 2 , La 2 o 3 , Fe 2 o 3 , Ga 2 o 3 According to the stoichiometric ratio of ingredients, add ethanol, the amount of ethanol added is 25mL / 10g of the mixture, put it into a ball mill jar and mill it for 24 hours to mix evenly; after mixing evenly, put the mixture in an oven...

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Abstract

The invention discloses a high-temperature piezoelectric ceramic acoustic emission sensor which comprises a packaging shell, an acoustic transmission layer, a conductive adhesive, a piezoelectric element, a lead connected with the positive electrode surface of the piezoelectric element, a backing layer between the piezoelectric element and the packaging layer, a radio frequency connector and a radio frequency coaxial cable, wherein the piezoelectric element is ceramic, x is greater than or equal to 0.30 and less than or equal to 0.33, y is greater than or equal to 0.05 and less than or equal to 0.10, a is greater than or equal to 0.02 and less than or equal to 0.05, b is greater than or equal to 0.01 and less than or equal to 0.03, and c is greater than or equal to 0.01 and less than or equal to 0.03. The ceramic has a high Curie temperature (TC=470 DEG C-500 DEG C) and an excellent piezoelectric property (d33>230pC / N). The acoustic emission sensor prepared by the invention can stablywork at a high temperature of 300 DEG C, has the characteristics of high sensitivity, high signal-to-noise ratio, simple manufacturing process, convenience in use and the like, and has important significance for applying an acoustic emission technology to online monitoring in the field of high temperature.

Description

technical field [0001] The invention belongs to the technical field of high-temperature sensing, and relates to an acoustic emission sensor, in particular to a bismuth scandate-lead titanate-bismuth ferrite ternary piezoelectric ceramic and an acoustic emission sensor thereof. Background technique [0002] my country's high-end equipment manufacturing industry has entered a period of rapid development. As the foundation and core of intelligent manufacturing, sensors will help the transformation and upgrading of China's high-end manufacturing industry. Piezoelectric material is a functional material that can realize mutual conversion between electrical energy and mechanical energy. Piezoelectric devices based on piezoelectric materials have urgent applications in the fields of national defense, aerospace, new energy, nuclear energy, oil well detection, and automotive internal combustion engines. need. In recent years, with the rapid development of modern industry, the applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/14C04B35/50C04B35/478C04B41/88
CPCG01N29/14C04B35/50C04B35/478C04B41/88C04B41/009C04B41/5116C04B2235/3286C04B2235/3298C04B2235/3296C04B2235/3227C04B2235/3272C04B2235/3262C04B2235/96
Inventor 黄世峰冯超杨长红耿朝辉张晓芳刘芬林秀娟程新
Owner UNIV OF JINAN
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