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Piezoelectric ceramic and preparation method thereof

A technology of piezoelectric ceramics and internal stress, which is applied in the field of functional materials, can solve problems such as complexity or dangerous practical discounts, and achieve the effects of improving piezoelectric thermal stability, simple preparation process, and reducing applied pressure

Active Publication Date: 2021-04-02
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the complexity or danger of their processing also greatly reduces the practicability, and exploring other methods to improve the thermal stability of piezoelectric ceramics is still a research hotspot in the field

Method used

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  • Piezoelectric ceramic and preparation method thereof
  • Piezoelectric ceramic and preparation method thereof

Examples

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preparation example Construction

[0038] The present invention provides a method for preparing piezoelectric ceramics described in the above technical solution, comprising:

[0039] Mixing the raw materials for preparing the piezoelectric ceramics to obtain a mixed powder;

[0040] After mixing the mixed powder and the binder, pressing to obtain a green body;

[0041] Sintering the green body to obtain piezoelectric ceramics;

[0042] The weight of the mixed powder is 0.2~1g;

[0043] The pressing pressure is 50~300MPa;

[0044] The sintering temperature is 1100-1250°C.

[0045] In the present invention, the method for preparing piezoelectric ceramics is to increase the weight of raw materials on the basis of the original preparation of piezoelectric ceramics, reduce the pressure of compression molding, and reduce the sintering temperature; the weight increase of the raw materials for preparation is preferably 0.5 ~ 1.5g, more preferably 0.8 ~ 1.2g, most preferably 1.0g; the pressure reduction of the press...

Embodiment 1

[0068] Example 1 (Na 0.5 Bi 0.5 ) 0.92 Ba 0.08 Ti 0.99 Mg 0.01 o 3 : NBT8M1.0 ferroelectric ceramic

[0069] NBT8M1.0 ceramic samples were prepared by traditional solid-phase synthesis method, and a certain proportion of Bi was stoichiometrically 2 o 3 , Na 2 CO 3 , BaCO 3 , MgO, TiO 2 (Analytical grade, Sinopharm Group) mixed, added alcohol ball mill for 12 hours, dried, and kept at 850°C for 2 hours to synthesize the initial powder whose component is NBT8 M1.0. Then add alcohol to the synthesized powder and ball mill it again for 12 hours and then dry it, add 10% binder (5% mass concentration of polyvinyl alcohol (PVA) aqueous solution) of the powder weight, and select a mold with a diameter of 0.5 inches to pass through a single shaft The compression method is pressed into a green body.

[0070] The weight of the initial powder is 0.2g, and the pressure of uniaxial compression is 200MPa;

[0071] After burning off the binder in the green body at a high tempera...

Embodiment 2～5

[0076] Ferroelectric ceramics were prepared according to the method of Example 1, the difference from Example 1 was that the weight of the initial powder was replaced by 0.4g, 0.6g, 0.8g, and 1.0g, respectively.

[0077] According to the method of Example 1, the properties of the ferroelectric ceramics prepared in Examples 2 to 5 are detected, and the detection results are as follows figure 1 shown.

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Abstract

The invention provides piezoelectric ceramic. Internal stress exists in the piezoelectric ceramic. The invention provides a method for improving thermal stability of piezoelectric ceramic. The methodcomprises the following steps: reducing the pressure in the process of preparing a green body by uniaxial compression, increasing the weight of used powder, and causing non-uniform density in the obtained green body; and then, selecting a low sintering temperature. Therefore, uneven densification and grain growth are shown in the sintering process of the ceramic, large residual stress is formed inthe obtained ceramic, the polarization strength of the polarized ceramic can be kept at a higher temperature, and the thermal stability (depolarization temperature) of the piezoelectric property of the ceramic is improved.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a piezoelectric ceramic and a preparation method thereof. Background technique [0002] Piezoelectric materials play an important role in electronic applications such as sensors, actuators, and transducers. These functional applications arise from the coupling of electrical polarization within the material with an external field (electric field or stress field). The diversification of applications puts forward different requirements on the performance of materials. Generally speaking, higher positive / reverse piezoelectric response and higher thermal stability are the main considerations for choosing piezoelectric materials. At present, the mainstream piezoelectric materials in commercial use are various lead-containing piezoelectric materials. However, considering the volatility and possible harm of lead element, since the second half of last century, m...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/475
CPCC04B35/622C04B35/475C04B2235/3298C04B2235/442C04B2235/3206
Inventor 初宝进陈攀
Owner UNIV OF SCI & TECH OF CHINA
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