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Sodium-bismuth-titanate-base lead-free electrostrictive ceramic material and preparation method thereof

A technology of sodium bismuth titanate-based and ceramic materials is applied in the field of electrostrictive ceramics, which can solve the problems of pollution of lead-based electrostrictive materials and achieve the effect of good dielectric relaxation performance.

Inactive Publication Date: 2015-11-11
HUBEI UNIV
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  • Application Information

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Problems solved by technology

[0017] The purpose of the present invention is to provide a novel, lead-free, large strain electrostrictive material, to solve the pollution problems existing in the production process of the existing lead-based electrostrictive material, and to develop its application in transducers and micro-displacement devices Aspects of application

Method used

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  • Sodium-bismuth-titanate-base lead-free electrostrictive ceramic material and preparation method thereof
  • Sodium-bismuth-titanate-base lead-free electrostrictive ceramic material and preparation method thereof
  • Sodium-bismuth-titanate-base lead-free electrostrictive ceramic material and preparation method thereof

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specific Embodiment 1

[0037] 1. Will analyze pure raw NaCO 3 , Bi 2 o 3 ,TiO 2 According to (Na 0.5 Bi 0.5 )TiO 3 Stoichiometric weighing, mixed ball milling, the ball milling medium is ethanol, the rotating speed is 400r / min, and the ball milling time is 10h.

[0038] 2. Wash out the ball-milled slurry in step 1, put it in an oven at 100°C for drying, grind and compact it, put it in a muffle furnace and raise the temperature to 800°C at a uniform speed at a rate of 3°C / min, and keep it warm for 2 hours , cooled to room temperature in the furnace, and ground to obtain powder A.

[0039] 3. Will analyze the pure raw material SrCO 3 ,TiO 2 According to SrTiO 3 The stoichiometric ratio is weighed, and mixed ball milling is carried out, the ball milling medium is ethanol, the rotating speed is 400r / min, and the ball milling time is 10h.

[0040] 4. Wash out the ball-milled slurry in step 3, put it in an oven at 100°C for drying, grind and compact it, put it in a muffle furnace and raise the t...

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Abstract

The invention discloses a sodium-bismuth-titanate-base lead-free electrostrictive ceramic material and a preparation method thereof. The general formula of the material is (1-x)(Na0.5Bi0.5)TiO3-xSrTiO3-0.01KNbO3-ySm2O3-zY2O3, wherein x=0.45-0.60, y=0.01-0.02, and z=0.01-0.04. The preparation technique adopts a solid-phase process and comprises the following steps: respectively presintering and synthesizing (Na0.5Bi0.5)TiO3, SrTiO3 and KNbO3 powders, carrying out ball milling in an ethanol medium according to the stoichiometric proportion by using rare-earth Sm2O3 and Y2O3 as dopants to obtain a slurry, drying, grinding, carrying out extrusion forming, and sintering to obtain the ceramic. The ceramic material prepared by the method has favorable dispersivity when the dielectric peak is 20-50 DEG C, and the dispersion coefficient gamma is greater than 1.9. The ceramic material has favorable electrostrictive properties, and the maximum electrostriction value in a 40kv / cm electric field is 0.3%. The dielectric constant at room temperature under the condition of 1kHz is greater than 3500, and the dielectric loss is lower than 0.02. The material has the advantages of simple preparation technique and low price, is free of the harmful element Pb, satisfies the requirements for the environment-friendly material, and has favorable application prospects in the fields of ultrasonic transducers, micro shifters and the like.

Description

technical field [0001] The invention relates to the technical field of electrostrictive ceramics, in particular to a bismuth sodium titanate-based lead-free electrostrictive ceramic material and a preparation method thereof. Background technique [0002] Electrostriction is a basic electromechanical coupling effect that exists in all solid substances. In the early stage, because the electrostrictive effect is generally small, it is not easy to be observed. Even if the electric field strength reaches the breakdown field strength, the field-induced strain of the medium is only 10 -8 order of magnitude, compared to piezoelectric effect and magnetostrictive effect (10 -6 ) is much smaller, so it is rarely studied in simple solid matter. [0003] Compared with the piezoelectric effect, electrostrictive materials have the advantages of no need for polarization, good repeatability, and no aging, so they have important application prospects in the fields of micro-displacement devi...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/622
Inventor 曹万强周超刘培朝周凤丽李阳王龙海祁亚军
Owner HUBEI UNIV
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