Nb-position Cr/Mo codoped bismuth-calcium niobate high-temperature piezoelectric ceramic material and preparation method therefor

A technology of calcium bismuth niobate and high temperature piezoelectricity is applied in the field of piezoelectric ceramic materials to achieve the effects of excellent piezoelectric performance, improved piezoelectric performance and good high temperature stability

Active Publication Date: 2019-05-03
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no Cr / Mo co-doping to improve bismuth layered calcium bismuth niobate (CaBi 2 Nb 2 o 9 )Related reports on the properties of piezoelectric ceramic materials

Method used

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  • Nb-position Cr/Mo codoped bismuth-calcium niobate high-temperature piezoelectric ceramic material and preparation method therefor
  • Nb-position Cr/Mo codoped bismuth-calcium niobate high-temperature piezoelectric ceramic material and preparation method therefor
  • Nb-position Cr/Mo codoped bismuth-calcium niobate high-temperature piezoelectric ceramic material and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Prepare CaBi in accordance with chemical composition 2 Nb 2-x (Mo 2 / 3 Cr 1 / 3 ) x O 9 , X = 0.03 Cr / Mo co-doped modified calcium bismuth niobate (CaBi 2 Nb 2 O 9 ) Lead-free piezoelectric ceramics, including the following steps:

[0042] (1) Ingredients: CaCO 3 Powder, Bi 2 O 3 Powder, Nb 2 O 5 Powder, Cr 2 O 3 Powder and MoO 3 The powder is the raw material, and the ingredients are mixed according to the stoichiometry of Ca, Bi, Nb, Cr and Mo in the general formula;

[0043] (2) One-time ball milling: Add the same amount of absolute ethanol as the mixture to the above mixture, and continue the ball milling for 12 hours to mix the powder uniformly to form a slurry, which can further improve the bismuth calcium niobate high-temperature piezoelectric ceramic material Comprehensive performance;

[0044] (3) Drying: Put the above slurry in a constant temperature oven to bake, remove the absolute ethanol, and grind in a mortar to obtain a powder;

[0045] (4) Pre-burning of pressed t...

Embodiment 2

[0057] Prepare CaBi in accordance with chemical composition 2 Nb 2-x (Mo 2 / 3 Cr 1 / 3 ) x O 9 , X=0.04 Cr / Mo co-doped modified calcium bismuth niobate (CaBi 2 Nb 2 O 9 ) Lead-free piezoelectric ceramics, including the following steps:

[0058] (1) Ingredients: CaCO 3 Powder, Bi 2 O 3 Powder, Nb 2 O 5 Powder, Cr 2 O 3 Powder and MoO 3 The powder is the raw material, and the ingredients are mixed according to the stoichiometry of Ca, Bi, Nb, Cr and Mo in the general formula;

[0059] (2) One-time ball milling: Add the same amount of absolute ethanol as the mixture to the above mixture, and continue the ball milling for 12 hours to mix the powder uniformly to form a slurry, which can further improve the bismuth calcium niobate high-temperature piezoelectric ceramic material Comprehensive performance;

[0060] (3) Drying: Put the above slurry in a constant temperature oven to bake, remove the absolute ethanol, and grind in a mortar to obtain a powder;

[0061] (4) Pre-burning of pressed tab...

Embodiment 3

[0073] Prepare CaBi in accordance with chemical composition 2 Nb 2-x (Mo 2 / 3 Cr 1 / 3 ) x O 9 , X=0.05 Cr / Mo co-doped modified calcium bismuth niobate (CaBi 2 Nb 2 O 9 ) Lead-free piezoelectric ceramics, including the following steps:

[0074] (1) Ingredients: CaCO 3 Powder, Bi 2 O 3 Powder, Nb 2 O 5 Powder, Cr 2 O 3 Powder and MoO 3 The powder is the raw material, and the ingredients are mixed according to the stoichiometry of Ca, Bi, Nb, Cr and Mo in the general formula;

[0075] (2) One-time ball milling: Add the same amount of absolute ethanol as the mixture to the above mixture, and continue the ball milling for 12 hours to mix the powder uniformly to form a slurry, which can further improve the bismuth calcium niobate high-temperature piezoelectric ceramic material Comprehensive performance;

[0076] (3) Drying: Put the above slurry in a constant temperature oven to bake, remove the absolute ethanol, and grind in a mortar to obtain a powder;

[0077] (4) Pre-burning of pressed tab...

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Abstract

The invention discloses a Nb-position Cr/Mo codoped bismuth-calcium niobate high-temperature piezoelectric ceramic material and a preparation method therefor. The piezoelectric ceramic material has ageneral formula of CaBi2Nb2-x (Mo2/3Cr1/3)xO9, wherein x is not smaller than 0.03 and not greater than 0.075. The invention further discloses the preparation method for the piezoelectric ceramic material. The method comprises the steps of adopting a piezoelectric material of a system CaBi2Nb2O9 as a base, doping certain proportions of Cr and Mo to the Nb position according to a mole ratio of 1: 2,and adopting the traditional solid-phase synthesis method, thereby preparing the novel bismuth-layered-structure piezoelectric ceramic material. Compared with the prior art, the piezoelectric ceramicmaterial obtained by the method has the advantages that main performance parameters are as follows: d33 is equal to 15pC/N, TC is equal to 939 DEG C, and rho is equal to 3.3*10<5>omega.cm when the temperature is 600 DEG C; and furthermore, the preparation process is stable and reliable, the production cost is low, industrial production is easy to achieve, and the piezoelectric ceramic material has a good application prospect in the field of high temperatures. Various piezoelectric sensors are assembled from ceramic components made from the material and can be applied to special hot environments of aerospace & aviation, petrochemical industry and the like.

Description

Technical field [0001] The invention relates to a preparation method of a bismuth layered calcium bismuth niobate high-temperature piezoelectric ceramic material, in particular to a Cr / Mo co-doped bismuth layered calcium bismuth niobate (CaBi 2 Nb 2 O 9 ) The preparation of piezoelectric ceramic materials belongs to the field of piezoelectric ceramic materials. Background technique [0002] At present, the most widely used piezoelectric materials are mainly PZT-based piezoelectric ceramics with a perovskite structure. However, the Curie temperature of such piezoelectric ceramics is generally below 390°C. Due to the depolarization of piezoelectric materials, the pressure Electrical materials cannot work normally below the Curie temperature. With the rapid development of aerospace, geological exploration and other industries and the sustainable development of human society, it is necessary to find an environmentally friendly piezoelectric material with high Curie temperature and ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 郑鹏陈振宁李旭东盛林生白王峰郑辉郑梁张阳
Owner HANGZHOU DIANZI UNIV
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