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Abnormal piezoelectric anisotropy lead-free piezoelectric ceramic and texturing preparation method thereof

An anisotropic, lead-free piezoelectric technology, applied in the field of piezoelectric ceramic materials, can solve the problems of long cycle, high cost, unfavorable industrialization and application, etc.

Active Publication Date: 2014-04-09
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the template and reaction template grain growth technology needs to prepare template grains, the preparation process is complicated, the cycle is long, and the cost is high, so it does not take advantage of industrial promotion and application.

Method used

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  • Abnormal piezoelectric anisotropy lead-free piezoelectric ceramic and texturing preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation composition is: (Bi 1 / 2 Na 1 / 2 )TiO 3 +0.5%Nb 2 o 5 +0.1%CeO 2

[0019] The preparation method is:

[0020] To analyze pure Bi 2 o 3 、Na 2 CO 3 , Nb 2 o 5 , CeO 2 and TiO 2 As a raw material, according to the chemical formula:

[0021] (Bi 1 / 2 Na 1 / 2 )TiO 3 +0.5%Nb 2 o 5 +0.1%CeO 2

[0022] Proceed to the ingredients. Use absolute ethanol as the medium, ball mill for 24 hours, and after drying, keep warm at 850°C for 2 hours in a zirconium crucible to synthesize the main crystal phase. The synthesized powder was pulverized, and 8% PVA was added and ball-milled for 12 hours for a second time with absolute ethanol as the medium. After drying, it is pressed under a pressure of 500 MPa to form a cylinder 1 with a diameter of 12 mm and a height of 15 mm.

[0023] The cylinder 1 is kept at 700° C. for 2 hours, and then kept at 1150° C. for 2 hours to sinter the cylinder ceramics. The sintered cylindrical ceramics are cut into thin discs ...

Embodiment 2

[0025] Preparation composition is: (Bi 1 / 2 Na 1 / 2 )TiO 3 +0.8%Nb 2 o 5 +0.5%CeO 2

[0026] The preparation process is the same as in Example 1, except that the molding pressure is 400 MPa, the diameter of the cylinder 1 is 10 mm, and the height is 15 mm.

Embodiment 3

[0028] Preparation composition is: (Bi 1 / 2 Na 1 / 2 )TiO 3 +0.2%Nb 2 o 5 +0.8%CeO 2

[0029] The preparation process is the same as in Example 1, except that the molding pressure is 450 MPa, the diameter of the cylinder 1 is 10 mm, and the height is 18 mm.

[0030] The performance measurement results are shown in Table 1. For comparison, the performance of the non-textured thin wafer samples prepared by the traditional method is also listed in the table.

[0031] Table 1 Properties of textured samples cut by high-pressure cylinder and non-textured samples prepared by traditional preparation methods

[0032] Preparation d 33 (pC / N) k t k p k t / k p High-pressure cylinder cut sample (Example 1) 125 0.65 0.08 8.1 High-pressure cylinder cut sample (Example 2) 112 0.58 0.09 6.4 High-pressure cylinder cut sample (Example 3) 120 0.63 0.08 7.9 Non-textured samples 76 0.46 0.12 3.8

[0033] Through the exam...

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Abstract

The invention discloses an abnormal piezoelectric anisotropy lead-free piezoelectric ceramic and a texturing preparation method thereof. The component of the abnormal piezoelectric anisotropy lead-free piezoelectric ceramic is (Bi1 / 2Na1 / 2)TiO3+x(Nb2O5+CeO2), wherein x is mole fraction, 0.005<x<0.1, and Nb2O5 and CeO2 content ratio (molar ratio) Nb2O5 / CeO2 is equal to 0.1-10. The texturing preparation method adopts a high-pressure cylinder forming method, can promote the texturing of the ceramic only by carrying out a conventional sintering process, and can significantly improve the piezoelectric property and anisotropy of sodium bismuth titanate based piezoelectric ceramic by cutting in the direction vertical to a pressure axis. The abnormal piezoelectric anisotropy sodium bismuth titanate based piezoelectric ceramic disclosed by the invention is simple and stable in preparation process and good in performance, and the piezoelectric constant d33 of the piezoelectric ceramic can reach 125pC / N; compared with a conventional non-texturing sample, the performance is increased by 65%, and the piezoelectric anisotropy kt / kp can reach 8.1; compared with the conventional non-texturing sample, the anisotropy is increased by 113%.

Description

technical field [0001] The invention relates to a piezoelectric ceramic material, in particular to an anomalous piezoelectric anisotropic lead-free piezoelectric ceramic and a texture preparation method thereof. Background technique [0002] Piezoelectric transducers are widely used in many fields such as ultrasonic medical diagnosis, industrial non-destructive testing, hydrophones and transformers. With the rapid development of the field of ultrasonic technology, higher requirements are put forward for the performance of piezoelectric transducer materials, requiring the highest possible thickness electromechanical coupling coefficient k t with piezoelectric anisotropy k t / k p , so that the transducer and the medium are fully coupled without spurious mode interference, the energy is more concentrated in the thickness mode, the sensitivity and resolution are high, and the device is more miniaturized. [0003] For a long time, traditional piezoelectric ceramics are lea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
Inventor 周昌荣杨涛周秀娟杨华斌周沁陈国华袁昌来马家峰杨云
Owner GUILIN UNIV OF ELECTRONIC TECH
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