Bismuth titanate based piezoelectric ceramic with high curie temperature and preparation method thereof

A piezoelectric ceramic, bismuth titanate-based technology, applied in the field of high-temperature piezoelectric ceramics, can solve the problems of difficult to obtain dense BIT ceramics, low piezoelectric activity, poor sintering process, etc., and achieve a stable and reliable preparation process

Active Publication Date: 2010-12-15
深圳智胜高技术发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this material is that the sintering process is poor, and it is difficult to obtain dense BIT ceramics by using ordinary sintering processes.
In addition, the material has low piezoelectric activity, high coercive field, and difficult polarization, which limit its practical application.

Method used

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  • Bismuth titanate based piezoelectric ceramic with high curie temperature and preparation method thereof
  • Bismuth titanate based piezoelectric ceramic with high curie temperature and preparation method thereof
  • Bismuth titanate based piezoelectric ceramic with high curie temperature and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The present embodiment is a bismuth titanate-based piezoelectric ceramic with a high Curie temperature, and its formula is (1-x)(0.6Bi 4 Ti 3 o 12 -0.4BaTiO 3 )-x(1 / 3Pb 3 o 4 +TiO 2 ), wherein, x=0.02, BaTiO 3 , Pb 3 o 4 and TiO 2 for analytical purity. 0.98(0.6Bi 4 Ti 3 o 12 -0.4BaTiO 3 )-0.02PbTiO 3 ceramics. Concrete preparation process comprises the following steps:

[0025] Step 1, prepare Bi by molten salt method 4 Ti 3 o 12 Powder; with analytically pure Bi 2 o 3 、TiO 2 as raw material, according to Bi 4 Ti 3 o 12 The stoichiometric ratio ingredients were ball milled in absolute ethanol medium for 24 hours, and after the powder was dried, 25wt% KCl and 25wt% NaCl were added, and then ball milled in anhydrous ethanol medium for 4 hours and then dried at a temperature of 50 ℃; the drying time is 12h, and after drying, pre-burn at 1000°C for 8h to obtain a powder containing molten salt, and the powder is cleaned to verify that there is no Cl...

Embodiment 2

[0031] The present embodiment is a bismuth titanate-based piezoelectric ceramic with a high Curie temperature, and its formula is (1-x)(0.6Bi 4 Ti 3 o 12 -0.4BaTiO 3 )-x(1 / 3Pb 3 o 4 +TiO 2 ), wherein, x=0.06, BaTiO 3 , Pb 3 o 4 and TiO 2 for analytical purity. 0.94(0.6Bi 4 Ti 3 o 12 -0.4BaTiO 3 )-0.06PbTiO 3 ceramics. Concrete preparation process comprises the following steps:

[0032] Step 1, prepare Bi by molten salt method 4 Ti 3 o 12 Powder; with analytically pure Bi 2 o 3 、TiO 2 as raw material, according to Bi 4 Ti 3 o 12 The stoichiometric ratio ingredients were ball milled in absolute ethanol medium for 24 hours, and after the powder was dried, 25wt% KCl and 25wt% NaCl were added, and then ball milled in anhydrous ethanol medium for 4 hours and then dried at a temperature of 60 ℃; the drying time is 9h, and after drying, pre-calcined at 1000°C for 8h to obtain a powder containing molten salt, and the powder is cleaned to verify that there is no...

Embodiment 3

[0038] The present embodiment is a bismuth titanate-based piezoelectric ceramic with a high Curie temperature, and its formula is (1-x)(0.6Bi 4 Ti 3 o 12 -0.4BaTiO 3 )-x(1 / 3Pb 3 o 4 +TiO 2 ), wherein, x=0.10, BaTiO 3 , Pb 3 o 4 and TiO 2 for analytical purity. 0.90(0.6Bi 4 Ti 3 o 12 -0.4BaTiO 3 )-0.10PbTiO 3 ceramics. Concrete preparation process comprises the following steps:

[0039] Step 1, prepare Bi by molten salt method 4 Ti 3 o 12 Powder; with analytically pure Bi 2 o 3 、TiO 2 as raw material, according to Bi 4 Ti 3 o 12 The stoichiometric ratio ingredients were ball milled in anhydrous ethanol medium for 24 hours, and 25wt% KCl and 25wt% NaCl were added after the powder was dried, and then dried in anhydrous ethanol medium for 4 hours after ball milling at a temperature of 70 ℃; the drying time is 6h, and after drying, pre-burn at 1000°C for 8h to obtain a powder containing molten salt, and the powder is cleaned to verify that there is no Cl -...

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Abstract

The invention provides bismuth titanate based piezoelectric ceramic with high curie temperature and a preparation method thereof. (1-x)(0.6Bi4Ti3O12-0.4BaTiO3)-xPbTiO3 ceramic is prepared by the traditional solid-phase sintering method, wherein x=0.02-0.10. The piezoelectric ceramic with the high curie temperature is prepared from Bi4Ti3O12 prepared by a molten salt method and analytical pure BaTiO3, Pb3O4 and TiO2 serving as raw materials by the steps that powder is mixed, ball-milled, dried, presintered, secondarily ball-milled, pelleted, molded and batched sequentially and is finally sintered for 2-4 hours at the temperature of 1,050 to 1,100 DEG C. The piezoelectric ceramic is prepared by the traditional piezoelectric ceramic preparation method. The prepared BaBi4Ti4O15 based piezoelectric ceramic has the curie temperature of over 450 DEG C, a stable and reliable preparation process, an electrical property which meets the requirement on the practicability of the piezoelectric ceramic and application to special high-temperature environments such as aerospace, petrochemical industry and the like.

Description

technical field [0001] The invention relates to the field of high-temperature piezoelectric ceramics in the subject of materials, and relates to a bismuth titanate-based high-temperature piezoelectric ceramic material. Background technique [0002] Piezoelectric materials are an important class of high-tech new materials with fierce international competition, and are widely used in high-tech fields such as electronics, communications, aerospace, military and biology. [0003] At present, the most widely used piezoelectric material is perovskite-type lead zirconate titanate (PbZr x Ti 1-x o 3 , abbreviated as PZT) or piezoelectric ceramics based on PZT mixed with other elements, various piezoelectric ceramic filters, oscillators, resonators, frequency discriminators and other electronic components prepared by this type of material are widely used in Electronics, communications, aerospace, military and other fields. However, the Curie temperature T of the piezoelectric cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
Inventor 高峰李博刘亮亮许贝胡国辛曹宵
Owner 深圳智胜高技术发展有限公司
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