Bismuth ferrite-based leadless piezoelectric ceramic with high Curie temperature and preparation method thereof

A lead-free piezoelectric and bismuth ferrite technology is applied in the field of lead-free piezoelectric ceramic materials to achieve the effects of simple preparation process, reduced production cost and simplified sintering process

Inactive Publication Date: 2011-11-23
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, currently in BiFeO 3 – BaTiO 3 –BiMnO 3 In the lead-free piezoelectric ceramics and its preparation method, the piezoelectric performance is improved and the preparation process is improved by compound substitution modification and non-stoichiometric ratio at the A and B positions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The preparation ingredients are: (1- x - y ) (Bi z m 1-z ) t (Fe u M' 1-u )O 3 – x BaTiO 3 – y BiMnO 3 ,in x =0.33, y =0.008, z =0.004, u=0.004, M=70%La+30%Nd, M′=50%Al+50%Yb, high Curie temperature bismuth ferrite-based lead-free piezoelectric ceramics with t=1.08.

[0019] Preparation:

[0020] To analyze pure Bi 2 o 3 , Fe 2 o 3 、BaCO 3 、TiO 2 , MnO 2 、Nd 2 o 3 , Yb 2 o 3 , La 2 o 3 and Al 2 o 3 as raw materials, respectively according to the following chemical formula:

[0021] (1- x - y ) (Bi z m 1-z ) t (Fe u M'1-u )O 3 – x BaTiO 3 – y BiMnO 3 ,in x =0.33, y =0.008, z =0.004, u=0.004, M=70%La+30%Nd, M′=50%Al+50%Yb, t=1.08

[0022] Perform batching, wet grinding with absolute ethanol as the medium, dry at 80°C and then heat at 850-900°C for 3-6 hours to pre-synthesize the ceramic material; the synthesized ceramic material is wet-milled for the second time with absolute ethanol as the medium for 24 hours, baked After dry...

Embodiment 2

[0026] The preparation ingredients are (1- x - y ) (Bi z m 1-z ) t (Fe u M' 1-u )O 3 – x BaTiO 3 – y BiMnO 3 ,That x =0.30, y =0.008, z =0.007, u=0.007, M=60%Y+40%Dy, M′=50Ga%+50%Sc, high Curie temperature bismuth ferrite-based lead-free piezoelectric ceramics with t=1.05.

[0027] Preparation:

[0028] To analyze pure Bi 2 o 3 , Fe 2 o 3 、BaCO 3 、TiO 2 , MnO 2 、Dy 2 o 3 、Sc 2 o 3 , Ga 2 o 3 , Y 2 o 3 and Al 2 o 3 as raw materials, respectively according to the following chemical formula:

[0029] (1- x - y ) (Bi z m 1-z ) t (Fe u M' 1-u )O 3 – x BaTiO 3 – y BiMnO 3 ,in x =0.30, y =0.008, z =0.007, u=0.007, M=60%Y+40%Dy, M'=50Ga%+50%Sc, t=1.05.

[0030] Perform batching, wet grinding with absolute ethanol as the medium, dry at 80°C and heat at 850-900°C for 3-6 hours to pre-synthesize the ceramic material; the synthesized ceramic material is wet-milled for the second time with absolute ethanol as the medium for 24 hours, baked A...

Embodiment 3

[0033] The preparation composition is (1-x-y) (Bi z m 1-z ) t (Fe u M' 1-u )O 3 –xBaTiO 3 –yBiMnO 3 , where x=0.33, y=0.008, z=0.006, u=0.006, M=70%Sm+30%Nd, M′=In, t=1.03 high Curie temperature bismuth ferrite-based lead-free piezoelectric ceramics.

[0034] Preparation:

[0035] To analyze pure Bi 2 o 3 , Fe 2 o 3 、BaCO 3 、TiO 2 , MnO 2 、Dy 2 o 3 、Sc 2 o 3 , Ga 2 o 3 , Y 2 o 3 and Al 2 o 3 as raw materials, respectively according to the following chemical formula:

[0036] (1-x-y) (Bi z m 1-z ) t (Fe u M' 1-u )O 3 –xBaTiO 3 –yBiMnO 3 , where x=0.33, y=0.008, z=0.006, u=0.006, M=70%Sm+30%Nd, M′=In, t=1.03.

[0037] Perform batching, wet grinding with absolute ethanol as the medium, dry at 80°C and heat at 850-900°C for 3-6 hours to pre-synthesize the ceramic material; the synthesized ceramic material is wet-milled for the second time with absolute ethanol as the medium for 24 hours, baked After drying, pass through a 250-mesh sieve, then...

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Abstract

The invention discloses a bismuth ferrite-based leadless piezoelectric ceramic with high Curie temperature and a preparation method thereof. The general formula for the piezoelectric ceramic is (1-x-y)(BizM1-z)t(FeuM'1-u)O3-xBaTiO3-yBiMnO3, wherein, M is a trivalent metallic element with large ionic radius, M' is a trivalent metallic element with small ionic radius, and x, y, u, t and z represent mole content in a ceramic system and satisfy the following relations: 0<=x<=1.0, 0<=y<=0.1, 0<z<1, 0.85<t<1.2, 0<u<1 and x+y<1. The piezoelectric ceramic is prepared by a conventional ceramic preparation method through selection of proper technological parameters. The piezoelectric constant d33 of the ceramic can reach 140 pC/N, Curie temperature can reach 490 DEG C, and Kt is more than 0.50. The preparation method has the advantages of a simple and stable process, and obtained leadless piezoelectric ceramic has excellent performance and is suitable for being used under high temperature.

Description

technical field [0001] The invention relates to a lead-free piezoelectric ceramic material, in particular to an ABO modified by compound substitution at the A and B positions 3 High Curie temperature bismuth ferrite-based lead-free piezoelectric ceramics with a perovskite structure and a preparation method thereof. Background technique [0002] High-temperature piezoelectric ceramics are widely used in many special fields such as aerospace, nuclear energy, metallurgy, petrochemical industry, geological exploration, etc. For example, the working temperature of dynamic fuel injection nozzles working in automobiles is as high as 300 ° C, and the acoustic logging energy conversion used in oil wells The operating temperature of the device also reaches 200~300°C. As a high-temperature piezoelectric ceramic material, it must have a temperature at which no structural phase change occurs at a higher temperature (> 400°C) to ensure that high-temperature depolarization does not occ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/622
Inventor 周昌荣岑侦勇周沁杨华斌成钧袁昌来陈国华
Owner GUILIN UNIV OF ELECTRONIC TECH
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