Lead-less piezoelectric sodium bismuth titanate-bariumtitanate ceramic and its prepn process

A lead-free piezoelectric, sodium bismuth titanate technology, applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the difficult to obtain anisotropic morphology, texture process Complicated, inconsistent material properties, etc., to achieve the effect of simple printing process, low cost, high density and degree of orientation

Inactive Publication Date: 2007-08-22
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the heat treatment technology has an obvious orientation effect, the process is complicated and the cost is high, so it is only used in the laboratory
Although template grain growth technology can be used to prepare ceramics with high degree of orientation, one of the key steps is to prepare anisotropic template grains, which makes the process more complicated.
In addition, since the template grains and the matrix do not belong to the same phase, this will inevitably lead to inconsistencies in the properties of the material.
[0006] In addition, due to the high symmetry of perovskite ceramics, grains tend to develop into cubic shapes during spontaneous growth, making it difficult to obtain anisotropic morphology.
Therefore, in the prior art, the texturing process of perovskite structure ceramics is very complicated

Method used

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  • Lead-less piezoelectric sodium bismuth titanate-bariumtitanate ceramic and its prepn process
  • Lead-less piezoelectric sodium bismuth titanate-bariumtitanate ceramic and its prepn process

Examples

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Embodiment 1

[0026] (1) Slurry preparation Dissolve 5.90 g of ethyl cellulose in 130.82 g of terpineol, heat and stir at 80°C until the ethyl cellulose is completely dissolved to form a transparent solution. Weigh 7.02g Na 2 CO 3 , 3.33g BaCO 3 , 10.32g Bi 2 o 3 and 17.21g nano-TiO 2 , added to the above solution, ball milled for 2 hours and mixed evenly. Then 25.80g of flaky Bi synthesized by molten salt method 4 Ti 3 o 12 Add in the slurry and continue ball milling for 15 minutes.

[0027] (2) Screen printing Screen-print the prepared slurry on a polyester film, put it in an oven at 100°C for drying, and repeat the above steps about 30 times until a ceramic film of 0.15 mm is formed.

[0028] (3) Forming The obtained ceramic membrane was cut into square pieces of 12 mm×12 mm, the membrane piece was removed from the substrate, about 60 layers were stacked, and pressed into shape.

[0029] (4) Exhaust plastic sintering Put the above-mentioned ceramic green body into a heat treatm...

Embodiment 2

[0032] (1) Slurry preparation Dissolve 5.90 g of ethyl cellulose in 130.82 g of terpineol, heat and stir at 80°C until the ethyl cellulose is completely dissolved to form a transparent solution. Weigh 6.65g Na 2 CO 3 , 3.33g BaCO3 , 16.16g Bi 2 o 3 and 18.01g nano-TiO 2 , added to the above solution, ball milled for 2 hours and mixed evenly. Then 19.46g of Na synthesized by solid phase reaction method 0.5 Bi 4.5 Ti 4 o 15 Add in the slurry and continue ball milling for 15 minutes.

[0033] (2) Screen printing Screen-print the prepared slurry on a polyester film, put it in an oven at 100°C for drying, and repeat the above steps about 30 times until a ceramic film of 0.15 mm is formed.

[0034] (3) Forming The obtained ceramic membrane was cut into square pieces of 12 mm×12 mm, the membrane piece was removed from the substrate, about 60 layers were stacked, and pressed into shape.

[0035] (4) Exhaust plastic sintering Put the above-mentioned ceramic green body into a ...

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Abstract

The present invention is one kind of lead-less piezoelectric sodium bismuth titanate-barium titanate ceramic, and belongs to the field of lead-less piezoelectric ceramic. The lead-less piezoelectric sodium bismuth titanate-barium titanate ceramic has the chemical formula of (Na1 / 2Bi1 / 2)1-xBaxTiO3, where, x is 0.05-0.1, and has ceramic crystal grains parallel to the grain boundary. Its preparation process includes the following steps: molten salt procedure to synthesize Bi4Ti3O12 template or solid phase reaction procedure to synthesize Na0.5Bi4.5Ti4O15 precursor material powder; preparing slurring with Na2CO3, BaCO3, Bi2O3 and nanometer TiO2; silk screen printing to obtain thick ceramic film; cutting, superposing and sintering.

Description

technical field [0001] The invention relates to sodium bismuth titanate-barium titanate lead-free piezoelectric ceramics and a preparation method thereof, belonging to the field of preparation of lead-free piezoelectric ceramics. Background technique [0002] Ferroelectric piezoelectric ceramics and their devices are widely used in industry, civilian products and military affairs. They are an important and irreplaceable high-tech material with fierce international competition. At present, most of the commonly used piezoelectric ceramics are lead-containing ceramics, such as PZT, etc. These lead-based ceramics have shown excellent performance near their quasi-isomorphic phase boundaries. However, the toxicity of lead and its environmental pollution have caused more and more serious impacts on human society. Therefore, the development of environmentally friendly lead-free piezoelectric ceramics is an urgent topic with great practical significance. [0003] Among many lead-fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/475C04B35/622H01L41/187
Inventor 李永祥伍萌佳杨群保
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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