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Lead-free electrostrictive ceramic material and preparation method thereof

A kind of ceramic material and stretching technology, which is applied in the direction of using electric/magnetic devices to transmit sensing components, etc., can solve the problems of lead-based electrostrictive ceramics pollution and other problems, achieve excellent electrostrictive performance, simple production process, and good temperature stability sexual effect

Inactive Publication Date: 2014-04-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of the prior art, provide a new lead-free electrostrictive material, solve the pollution problems existing in the production process of the existing lead-based electrostrictive ceramics, and develop its use in transducers, Applications for drives and sensors

Method used

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  • Lead-free electrostrictive ceramic material and preparation method thereof
  • Lead-free electrostrictive ceramic material and preparation method thereof
  • Lead-free electrostrictive ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take Na 2 CO 3 、K 2 CO 3 、 Bi 2 o 3 、TiO 2 and Nb 2 o 5 (analytical pure) as raw material, according to (1-y) [(1-x) (Bi 0.5 Na 0.5 )TiO 3 -x(Bi 0.5 K 0.5 )TiO 3 ]-y(K 0.5 Na 0.5 )NbO 3 The stoichiometric ratio (molar ratio) of K, Na, Bi, Ti and Nb in (x=0, 0.10≤y≤0.30) Weigh the raw materials, use absolute ethanol as the medium and use ZrO 2 The balls were milled in a ball mill jar for 24 hours, dried and ground, pressed and placed in a closed Al 2 o 3 In the crucible, it was pre-fired at 850°C for 4 hours, and then the pre-fired powder was placed in a ball mill jar for ball milling for 24 hours. After drying, add 8% PVA for granulation, then press molding at 50MPa to obtain a disc with a diameter of 10mm and a thickness of 1mm, deglue at 550°C, and finally sinter at 1150°C for 2 hours to form a ceramic composite with the above formula.

[0044] The ceramic disc is ground into a thin slice with a thickness of 0.5 mm by fine sand, and Ag electrodes ar...

Embodiment 2

[0052] Take Na 2 CO 3 、K 2 CO 3 、 Bi 2 o 3 、TiO 2 and Nb 2 o 5 (analytical pure) as raw material, according to (1-y) [(1-x) (Bi 0.5 Na 0.5 )TiO 3 -x(Bi 0.5 K 0.5 )TiO 3 ]-y(K 0.5 Na 0.5 )NbO 3 The stoichiometric ratio (molar ratio) of K, Na, Bi, Ti and Nb in (x=0.20, 0.10≤y≤0.20) Weigh the raw materials, use absolute ethanol as the medium and use ZrO2 The balls were milled in a ball mill jar for 20 hours, dried, pressed and placed in a closed Al 2 o 3 In the crucible, it was pre-fired at 800°C for 6 hours, and then the pre-fired powder was put back into a ball mill jar for ball milling for 24 hours. After drying, add 10% PVA as a binder for granulation, and then press molding at 100MPa to obtain a disc with a diameter of 15mm and a thickness of 0.8mm, deglue at 500°C, and finally sinter at 1120°C for 8 hours to form a ceramic composite with the above formula things.

[0053] The ceramic disc was polished with fine sand, coated with silver paste on both surfa...

Embodiment 3

[0061] Take Na 2 CO 3 、K 2 CO 3 、 Bi 2 o 3 、TiO 2 and Nb 2 o 5 (analytical pure) as raw material, according to (1-y) [(1-x) (Bi 0.5 Na 0.5 )TiO 3 -x(Bi 0.5 K 0.5 )TiO 3 ]-y(K 0.5 Na 0.5 )NbO 3 The stoichiometric ratio (molar ratio) of K, Na, Bi, Ti and Nb in (x=0.40, 0.10≤y≤0.30) Weigh the raw materials, use absolute ethanol as the medium, and use ZrO 2 The balls were milled in a ball mill jar for 24 hours, dried and ground, pressed and placed in a closed Al 2 o 3 In a crucible, it was pre-fired at 900°C for 2 hours, and then the pre-fired powder was put back into a ball mill jar for ball milling for 24 hours. After drying, add 8% PVA as a binder for granulation, and then obtain a disc with a diameter of 12mm and a thickness of 0.9mm by compression molding, deglue at 600°C, and finally sinter at 1180°C for 2 hours to form a ceramic composite with the above formula.

[0062] The ceramic disc was polished with fine sand, coated with silver paste on both surfac...

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Abstract

The invention relates to the field of electrostrictive ceramic, specifically discloses an environment-friendly lead-free electrostrictive ceramic material and a preparation method of the lead-free electrostrictive ceramic material, the chemical composition of the lead-free electrostrictive ceramic material is (1-y) [(1-x)(Bi0.5Na0.5)TiO3-x(Bi0.5K0.5)TiO3]-y(K0.5Na0.5)NbO3, wherein x is more than or equal to 0 and less than or equal to 0.40 and y is more than or equal to 0.10 and is less than or equal to 0.30. The preparation method comprises the following steps: taking the raw materials according to the chemical composition, performing ball milling and presintering after mixing the raw materials, then conducting secondary ball milling, performing compression molding after granulation to obtain a ceramic green body, then sintering at high temperature to obtain a ceramic body. Compared with the traditional electrostrictive material, the most significant advantage of the material obtained by the invention is environment friendliness, and the material has excellent electrostrictive preperty and high temperature characteristic, and can be applied to manufacturing electronic components such as drivers and sensors.

Description

technical field [0001] The invention relates to the field of electrostrictive ceramics, and specifically discloses a lead-free electrostrictive ceramic material and a preparation method thereof. Background technique [0002] Electrostrictive materials are a class of ferroelectric materials with diffusion phase transition characteristics. The so-called electrostrictive effect refers to the phenomenon of stretching and deformation caused by an electric field, which is a physical phenomenon that occurs when a solid medium is polarized under the action of an external electric field. The electrostrictive strain S (ΔL / L) is proportional to the square of the electrostrictive coefficient Q and the electric field intensity E, that is, S=QP 2 =Qε 2 E. 2 . Due to the needs of applications, researchers have studied the electrostrictive effect of various materials, and determined that in materials with high dielectric constant, especially relaxor ferroelectric materials with diffusio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/622G01D5/12
Inventor 翟继卫郝继功沈波
Owner TONGJI UNIV
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