Sodium bismuth titanate-barium titanate-potassium bismuth titanate lead-free piezoelectric texture ceramic and preparation method thereof

A bismuth sodium titanate-barium titanate and lead-free piezoelectric technology, which is applied in the field of lead-free piezoelectric materials, can solve the problems of easy uneven composition, difficult directional arrangement of templates, and high piezoelectric coefficient, achieving excellent performance, Good grain orientation effect and high texture effect

Inactive Publication Date: 2014-03-05
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In the Chinese patent CN101028979A, bismuth sodium titanate-bismuth potassium titanate piezoelectric textured ceramics were prepared by casting process. The texture degree can reach 71%, but the highest piezoelectric coefficient is only 134pC / N
[0006] In summary, the (reaction) template method for preparing piezoelectric textured ceramics is still immature. The main problems are that the template is not easy to be oriented, the components are easy to deviate, the composition is easy to be uneven, and the piezoelectric performance of ceramics is not high.

Method used

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  • Sodium bismuth titanate-barium titanate-potassium bismuth titanate lead-free piezoelectric texture ceramic and preparation method thereof
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  • Sodium bismuth titanate-barium titanate-potassium bismuth titanate lead-free piezoelectric texture ceramic and preparation method thereof

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preparation example Construction

[0038] A preparation method of sodium bismuth titanate-barium titanate-bismuth titanate potassium lead-free piezoelectric textured ceramics, the steps are as follows:

[0039] 1) Preparation of Bi 4 Ti 3 o 12 Template: Preparation of Bi by molten salt method 4 Ti 3 o 12 Flaky powder template, boiled and washed with hot deionized water;

[0040] Bi 4 Ti 3 o 12 The preparation method of the template is as follows: analytically pure bismuth titanate (Bi 2 o 3 ) and titanium dioxide (TiO 2 ) After mixing the ingredients, add sodium sulfate (Na 2 CO 3 ) and potassium sulfate (K 2 CO 3 ); among them, Bi 2 o 3 、TiO 2 、Na 2 SO 4 and K 2 SO 4 The matching ratio is as follows: Bi 2 o 3 with TiO 2 The mass ratio of Na is 3.89:1; Na 2 SO 4 and K 2 SO 4 According to the eutectic point ratio, its mass ratio is 69.3:30.7; Na 2 SO 4 and K 2 SO 4 The sum of the mass (that is, the sulfate content) accounts for 30-50wt% of the total mass of the four powders; after...

Embodiment 1

[0056] 1. Preparation of Bi 4 Ti 3 o 12 template

[0057] Weigh 19.888g of bismuth oxide powder, 5.112g of titanium dioxide powder, 17.324g of sodium sulfate, and 7.675g of potassium sulfate (the sulfate content accounts for 50wt% of the total mass of the powder). After the above powders were mixed, the planetary ball was milled for 6 hours at a speed of 1100 rpm. After ball milling, it is dried, ground and pre-fired. The pre-firing degree is to raise the temperature at a rate of 5 °C / min to 950 °C for 2 hours, and then slowly lower the temperature to 850 °C at a rate of 0.8 °C / min. After pre-firing, the powder is fired into a block and cooked with deionized water at 95°C until the block is completely pulverized. It was then washed 8 times with 60°C deionized water to remove residual sulfate. After drying, flake Bi 4 Ti 3 o 12 crystals. Its scanning electron microscope (SEM) image is as follows figure 2 shown.

[0058] 2. Prepare template slurry

[0059] Weigh 0....

Embodiment 2

[0068] 1. Preparation of bismuth titanate template

[0069] Weigh 19.888g of bismuth oxide powder, 5.112g of titanium dioxide powder, 7.422g of sodium sulfate, and 3.288g of potassium sulfate (the sulfate content accounts for 30wt% of the total mass of the powder). After the above powders were mixed, the planetary ball mill was carried out for 4 hours at a speed of 1100 rpm. After ball milling, it is dried, ground and pre-fired. The pre-firing degree is to raise the temperature at a rate of 3 °C / min to 950 °C for 2 hours, and then slowly lower the temperature to 850 °C at a rate of 0.2 °C / min. After pre-firing, the powder is fired into a block, which is cooked in deionized water at 95 °C until the block is completely pulverized. It was then washed 10 times with 60°C deionized water to remove residual sulfate. After drying, flake Bi 4 Ti 3 o 12 crystals.

[0070] 2. Preparation of Template Slurry

[0071] Weigh 18.815gBi 4 Ti 3 o 12 template, adding 82wt% ethanol-but...

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Abstract

The invention provides sodium bismuth titanate-barium titanate-potassium bismuth titanate lead-free piezoelectric texture ceramic and a preparation method thereof. The preparation method comprises the following steps: mixing a template with organic additives such as matrix powder, an organic solvent and a binder to obtain slurry by taking a Bi4Ti3O12 crystal as the template; preparing the slurry into a film sheet with thickness of 30 mu m-60 mu m through a curtain coating process; and sintering the film sheet after laminating, cutting, rubber exhausting and isostatic cool pressing to prepare a BNBK texture ceramic material with high oriented growth, wherein original components of the materials are not changed due to precise control in the process. The prepared sodium bismuth titanate-barium titanate-potassium bismuth titanate lead-free piezoelectric texture ceramic constitutes a (1-x-y)Na0.5Bi0.5TiO3-xBaTiO3-Yk0.5Bi0.5TiO3 ternary system, has good crystalline grain orientation effect, excellent performances in the lead-free piezoelectric field, a piezoelectric constant of over 210 pC/N and a Curie temperature of over 320 DEG C.

Description

technical field [0001] The invention belongs to the field of lead-free piezoelectric materials, in particular to a textured sodium bismuth titanate (Na 0.5 Bi 0.5 TiO 3 Abbreviated as BNT) based ceramic material and its preparation method. Background technique [0002] Piezoelectric materials are an important class of high-tech new materials with fierce international competition. There are many varieties of piezoelectric ceramics, which can be widely used as sensors, brakes and frequency converters in high-tech fields such as information, laser, navigation and biology. At present, the widely used piezoelectric material system is mainly lead-containing system, such as: PbZr x Ti 1‐x o 3 , Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 and Pb(Zn 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 . However, due to the toxicity of the Pb element in these materials, discarded lead-containing devices can cause various environmental problems such as water pollution and land pollution. This requires the devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
Inventor 邓珉阳李晓雷李婷赵志浩
Owner TIANJIN UNIV
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