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Barium titanate-based leadless electrostrictive ceramic and preparation method thereof

A technology of stretching and barium titanate, which is applied in the field of BZT-BCT barium titanate-based lead-free electrostrictive ceramics and its preparation, can solve problems such as environmental and human hazards, limit lead, etc., and achieve easy operation, large electrostrictive Stretch strain, good overall performance

Inactive Publication Date: 2014-02-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because lead is toxic and harmful to the environment and human body, the use of lead is now restricted internationally

Method used

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  • Barium titanate-based leadless electrostrictive ceramic and preparation method thereof
  • Barium titanate-based leadless electrostrictive ceramic and preparation method thereof
  • Barium titanate-based leadless electrostrictive ceramic and preparation method thereof

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preparation example Construction

[0037] The preparation method of the barium titanate-based lead-free electrostrictive ceramics adopts a solid-phase synthesis method, and the preparation steps are as follows:

[0038] (1) Ingredients synthesis

[0039] According to 50Ba(Zr x Ti 1-x )O 3 -50(Ba 0.75 Ca 0.25 )TiO 3 , where the stoichiometric ratio of x=0.15~0.30 weighs the original BaCO 3 , CaCO 3 , ZrO 2 and TiO 2 , into the ball mill tank, the ball milling medium is water and agate balls, ball: material: the weight ratio of water is 2: 1: 0.6, ball milling 4h, ball milling speed is 800 rpm, then the mixture is put into the oven for 80 Dry at ℃, put it into a mortar and grind it, and pass through a 40-mesh sieve;

[0040] (2) pre-burning

[0041] Put the ground and sieved powder in step (1) into a crucible, compact it with an agate rod, cover it, and seal it; pre-fire it in a muffle furnace at 1200 ° C, keep it warm for 4 hours, and cool it down to room temperature naturally. baked;

[0042] (3) S...

Embodiment 1

[0056] Example 1: x=0.15, the sintering temperature is 1400°C;

Embodiment 2

[0057] Example 2: x=0.20, the sintering temperature is 1400°C;

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PUM

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Abstract

The invention discloses a barium titanate-based leadless electrostrictive ceramic and a preparation method thereof. The chemical composition of the ceramic is, on the basis of mole percent, 50Ba(ZrxTi1-x)O3-50(Ba0.75Ca0.25)TiO3, wherein x is equal to 0.15 to 0.30. According to the invention, the traditional solid-phase synthesis preparation method is utilized; sintering is carried out at a temperature of 1300 to 1450 DEG C so as to obtain the leadless electrostrictive ceramic with relaxation characteristics and great electrostrictive strain. The preparation method provided by the invention has the advantages of simple process steps, easy operation, good repeatability and high yield, and the prepared ceramic has simple components and is mainly applicable to energy transducers, micropositioners and the like.

Description

technical field [0001] The invention relates to a ceramic composition characterized by components, in particular to BZT-BCT barium titanate-based lead-free electrostrictive ceramics and a preparation method thereof. Background technique [0002] Under the action of an external electric field, the strain produced by the dielectric is proportional to the square of the field strength, which is called electrostriction. This effect is caused by the polarization of the dielectric in the electric field and can occur in all dielectrics, and its characteristic is that the positive or negative strain has nothing to do with the direction of the external electric field. In the piezoelectric body, the external electric field can also cause another type of strain, which is proportional to the field strength, and the sign of the strain is reversed when the external field is reversed. The latter is the inverse effect of the piezoelectric effect, not electrostriction. The total strain of t...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/465C04B35/622
Inventor 马卫兵唐翠翠孙清池陈天凯张亚倩
Owner TIANJIN UNIV
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