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BCT-BZT-BST (Barium calcium titanate-barium zirconate titanate-barium stannate titanate) ternary system lead-free piezoelectric ceramic

A technology of barium zirconate titanate and barium calcium titanate, which is applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of poor piezoelectric performance of lead-free piezoelectric ceramics, and achieve The effect of high piezoelectric constant, stable and reliable preparation process, and good application prospects

Inactive Publication Date: 2013-06-05
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor piezoelectric performance of lead-free piezoelectric ceramics, to provide a BCT-BZT-BST ternary system ceramic powder and prepared ceramics, and its preparation process, the ceramics have relatively high good piezoelectric properties

Method used

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  • BCT-BZT-BST (Barium calcium titanate-barium zirconate titanate-barium stannate titanate) ternary system lead-free piezoelectric ceramic
  • BCT-BZT-BST (Barium calcium titanate-barium zirconate titanate-barium stannate titanate) ternary system lead-free piezoelectric ceramic
  • BCT-BZT-BST (Barium calcium titanate-barium zirconate titanate-barium stannate titanate) ternary system lead-free piezoelectric ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0019] The formula of this embodiment is Ba 0.8-x Ca x Ti 0.8 o 3 -0.1BaTi 0.9 sn0.1 o 3 -0.1BaTi 0.8 Zr 0.2 o 3 ,in x =0.005.

[0020] Weigh raw materials according to the stoichiometric ratio of the formula: BaCO 3 , CaCO 3 , SnO 2 , ZrO 2 、TiO 2 , the so-called raw material powder was ball milled with absolute ethanol as the medium for 10 hours, and the slurry obtained by ball milling was kept at 80°C for 10 hours. After drying the powder, it was pre-calcined at 1200°C for 6 hours to obtain Ba 0.795 Ca 0.005 Ti 0.8 o 3 -0.1BaTi 0.9 sn 0.1 o 3 -0.1BaTi 0.8 Zr 0.2 o 3 Powder; add 5 wt% PVB to granulate, and press it into a disc with a diameter of 10mm and a thickness of 1mm under a pressure of 100MPa; after the ceramics are fully debonded, they are sintered at 1350°C in air for 6h to prepare BCT-BZT- BST ternary ceramics.

[0021] The obtained BCT-BZT-BST ternary system lead-free piezoelectric ceramics are finely ground, ultrasonically cleaned and then...

Embodiment 2

[0024] The formula of this embodiment is Ba 0.8-x Ca x Ti 0.8 o 3 -0.1BaTi 0.9 sn 0.1 o 3 -0.1BaTi 0.8 Zr 0.2 o 3 ,in x =0.01.

[0025] Weigh raw materials according to the stoichiometric ratio of the formula: BaCO 3 , CaCO 3 , SnO 2 , ZrO 2 、TiO 2 , the so-called raw material powder was ball milled with absolute ethanol as the medium for 12 hours, and the slurry obtained by ball milling was kept at 80°C for 12 hours. After drying the powder, it was pre-calcined at 1250°C for 5 hours to obtain Ba 0.79 Ca 0.01 Ti 0.8 o 3 -0.1BaTi 0.9 sn 0.1 o 3 -0.1BaTi 0.8 Zr 0.2 o 3 Powder; add 6wt% PVB to granulate, and press it into a disc with a diameter of 10mm and a thickness of 1mm under a pressure of 200MPa; after the ceramic is fully debonded, it is sintered at 1400°C in air for 5h to prepare BCT-BZT-BST Ternary ceramics.

[0026] The obtained BCT-BZT-BST ternary system lead-free piezoelectric ceramics are finely ground, ultrasonically cleaned and then polariz...

Embodiment 3

[0029] The formula of this embodiment is Ba 0.8-x Ca x Ti 0.8 o 3 -0.1BaTi 0.9 sn 0.1 o 3 -0.1BaTi 0.8 Zr 0.2 o 3 ,in x =0.02.

[0030] Weigh raw materials according to the stoichiometric ratio of the formula: BaCO 3 , CaCO 3 , SnO 2 , ZrO 2 、TiO 2 , the so-called raw material powder was ball milled with absolute ethanol as the medium for 14 hours, and the slurry obtained by ball milling was kept at 80°C for 12 hours. After drying the powder, it was pre-calcined at 1300°C for 4 hours to obtain Ba 0.78 Ca 0.02 Ti 0.8 o 3 -0.1BaTi 0.9 sn 0.1 o 3 -0.1BaTi 0.8 Zr 0.2 o 3 Powder; add 6 wt% PVB to granulate, and press to form under a pressure of 150MPa; after the ceramics are fully debonded, they are sintered at 1450°C in air for 6 hours to prepare BCT-BZT-BST ternary ceramics.

[0031] The obtained BCT-BZT-BST ternary system lead-free piezoelectric ceramics are finely ground, ultrasonically cleaned and then polarized by a silver electrode at room temperature...

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Abstract

The invention belongs to the field of a lead-free piezoelectric material and discloses BCT-BZT-BST (barium calcium titanate-barium zirconate titanate-barium stannate titanate) ternary system lead-free piezoelectric ceramic. The BCT-BZT-BST ternary system lead-free piezoelectric ceramic is characterized by having the following material components: Ba0.8-xCaxTi0.8O3-0.1BaTi0.9Sn0.1O3-0.1BaTi0.8Zr0.2O3, wherein x is in the range of 0.005 to 0.06. The BCT-BZT-BST ternary system lead-free piezoelectric ceramic is prepared from industrial raw materials by adopting a conventional piezoelectric ceramic preparation technology. The system is a perovskite phase. When x is in the range of 0.005 to 0.04, the BCT-BZT-BST ternary system lead-free piezoelectric ceramic is in morphotropic phase boundary region, has excellent piezoelectric property, has a piezoelectric constant d33 value of 420pC / N and an electro-mechanical coupling coefficient of 44 percent, and has a stable preparation process and wide application prospect.

Description

technical field [0001] The invention belongs to the field of lead-free piezoelectric materials, in particular to a barium calcium titanate-barium zirconate titanate-tin barium titanate (BCT-BZT-BST) ternary lead-free piezoelectric ceramic and a preparation process thereof. Background technique [0002] For a long time, lead-based piezoelectric ceramics represented by lead zirconate titanate (PZT) have been dominant in commercial applications, but the lead content of PZT ceramics is as high as 60%, which is harmful to the ecological environment during preparation, use and disposal. It has caused serious harm to human health. Countries around the world, such as the European Union, the United States and Japan, have successively legislated. The Ministry of Information Industry of my country has also drafted the "Administrative Measures for the Prevention and Control of Pollution by Electronic Information Products", prohibiting or restricting the use of lead in the electronics indu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187C04B35/468C04B35/622
Inventor 李伟徐志军初瑞清付鹏李艳倪俊杰
Owner LIAOCHENG UNIV
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