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A kind of rubidium, cerium co-doped bismuth calcium niobate base high temperature piezoelectric ceramics and preparation method thereof

A calcium bismuth niobate-based, high-temperature piezoelectric technology, applied in the field of electronic ceramics and piezoelectric devices, can solve the problems of low piezoelectric performance and high Curie temperature, and achieve improved piezoelectric coefficient, high Curie temperature, and high temperature resistivity. improved effect

Active Publication Date: 2020-05-05
广州光鼎科技集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a rubidium, cerium co-doped bismuth calcium niobate-based high-temperature piezoelectric ceramics and its preparation method, the material solves the problem of the high Curie temperature of the existing CBNO material. The problem of low piezoelectric performance, which has both high Curie temperature and good piezoelectric performance, has practical application value in high-temperature electronic devices

Method used

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  • A kind of rubidium, cerium co-doped bismuth calcium niobate base high temperature piezoelectric ceramics and preparation method thereof
  • A kind of rubidium, cerium co-doped bismuth calcium niobate base high temperature piezoelectric ceramics and preparation method thereof
  • A kind of rubidium, cerium co-doped bismuth calcium niobate base high temperature piezoelectric ceramics and preparation method thereof

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Embodiment 1

[0034] The preparation method of the rubidium and cerium co-doped bismuth calcium niobate-based high-temperature piezoelectric ceramics in this embodiment comprises the following steps:

[0035] (1) The raw material is according to the general formula Ca 1-x-y Rb x Ce y Bi 2 Nb 2 o 9 , (x=y=0.005) weighed the ingredients, took absolute ethanol as the dispersion medium, put it in a nylon ball mill jar, and used a planetary ball mill to mill for 4 hours at a speed of 360rmp to obtain a mixed powder;

[0036] (2) Bake the mixed powder on a hot table for 12 hours, and after sieving, continuously raise the temperature to 900° C. in a box furnace and keep it warm for 2 hours to obtain bismuth-calcium niobate-based ceramic powder;

[0037] (3) Carry out secondary ball milling under the ball milling condition identical with step (1) with the synthetic bismuth calcium niobate base ceramic powder;

[0038] (4) Dry the powder after secondary ball milling, add 5wt% PVA to granulate,...

Embodiment 2

[0043] The preparation method of the rubidium and cerium co-doped bismuth calcium niobate-based high-temperature piezoelectric ceramics in this embodiment comprises the following steps:

[0044] (1) The raw material is according to the general formula Ca 1-x-y Rb x Ce y Bi 2 Nb 2 o 9 , (x=y=0.01) weigh the ingredients, use absolute ethanol as the dispersion medium, put it in a nylon ball mill jar, and use a planetary ball mill to mill for 4 hours at a speed of 360rmp to obtain a mixed powder;

[0045] (2) Bake the mixed powder on a hot table for 12 hours, and after sieving, continuously raise the temperature to 950° C. in a box furnace, and keep it warm for 2 hours to obtain bismuth calcium niobate-based ceramic powder;

[0046] (3) Carry out secondary ball milling under the ball milling condition identical with step (1) with the synthetic bismuth calcium niobate base ceramic powder;

[0047] (4) Dry the powder after secondary ball milling and add 5wt% PVA to granulate, ...

Embodiment 3

[0052] The preparation method of the rubidium and cerium co-doped bismuth calcium niobate-based high-temperature piezoelectric ceramics in this embodiment comprises the following steps:

[0053] (1) The raw material is according to the general formula Ca 1-x-y Rb x Ce y Bi 2 Nb 2 o 9 , (x=y=0.02) was weighed and batched, with absolute ethanol as the dispersion medium, placed in a nylon ball mill jar, and ball milled with a planetary ball mill at a speed of 360rmp for 4h to obtain a mixed powder;

[0054] (2) Bake the mixed powder on a hot table for 12 hours, and after sieving, continuously raise the temperature to 950° C. in a box furnace, and keep it warm for 2 hours to obtain bismuth calcium niobate-based ceramic powder;

[0055] (3) Carry out secondary ball milling under the ball milling condition identical with step (1) with the synthetic bismuth calcium niobate base ceramic powder;

[0056] (4) Dry the powder after secondary ball milling and add 5wt% PVA to granulat...

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Abstract

The invention discloses a rubidium-and-cerium co-doped calcium bismuth niobate (CBNO)-based high-temperature piezoelectric ceramic and a preparing method thereof. The structural general formula of thepiezoelectric ceramic is Ca1-x-yRbxCeyBi2Nb2O9, 0<=x<=0.5, and 0<=y<=0.5, wherein x and y represent mole fractions of elements rubidium and cerium respectively. According to the rubidium-and-cerium co-doped calcium bismuth niobate (CBNO)-based high-temperature piezoelectric ceramic and the preparing method thereof, a solid-phase method is adopted for preparing level-A calcium bismuth niobate piezoelectric ceramic materials doped with Rb and Ce ions of different contents; then through the process of pelleting, forming, glue discharging and sintering, the rubidium-and-cerium co-doped CNBO-basedhigh-temperature piezoelectric ceramic is prepared. The piezoelectric ceramic has excellent piezoelectric activity and a good high-temperature resistance rate. Various piezoelectric sensors assembledby means of the materials can be widely applied in the aspects such as measurement, detection and automatic control under high-temperature conditions.

Description

technical field [0001] The invention relates to the field of electronic ceramics and piezoelectric devices, in particular to a rubidium and cerium co-doped bismuth calcium niobate-based high-temperature piezoelectric ceramic and a preparation method thereof. Background technique [0002] In recent years, the rapid development of aerospace, petrochemical, metallurgy, energy and other fields has put forward higher performance requirements for various vibration sensors, acoustic transducers and other devices that operate in high temperature environments. At present, the most mature and successfully applied piezoelectric ceramics are lead zirconate titanate (PZT)-based piezoelectric ceramic materials, but the Tc of commercial PZT-based piezoelectric ceramics is generally 250-380 ° C, and due to the thermally activated aging process , its safe use temperature is limited to 1 / 2 of the Curie temperature, this type of ceramics can no longer meet the requirements of current high-tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/453C04B35/622C04B35/626C04B41/88
CPCC04B35/453C04B35/622C04B35/62605C04B41/5116C04B41/88C04B2235/3201C04B2235/3208C04B2235/3229C04B2235/3251C04B2235/6567C04B41/4539C04B41/0072
Inventor 晏海学章曼张斗李振纲李水林
Owner 广州光鼎科技集团有限公司
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