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A composite high temperature piezoelectric ceramic material

A ceramic material, high-temperature piezoelectric technology, applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problem of low piezoelectric constant

Active Publication Date: 2020-06-30
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For existing Bi 3 TaTiO 9 In order to solve the problem of low piezoelectric constant in piezoelectric ceramics, the present invention provides a composite high-temperature piezoelectric ceramic material

Method used

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  • A composite high temperature piezoelectric ceramic material
  • A composite high temperature piezoelectric ceramic material
  • A composite high temperature piezoelectric ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] BiFeO 3 The preparation of ceramic powder can refer to 【G.L.Yuan, S.W.Or, Y.P.Wang, Z.G.Liu, and J.M.Liu, Solid State Commun.138, 76(2006).】

[0026] In this example, Bi 2 o 3 , Fe 2 o 3 Powder preparation of BiFeO 3 ceramics. Ball milled in a ball mill with a rotating speed of 300r / min for 8 hours and dried to obtain BiFeO with more than 80% particles of micron diameter 3 Ceramic powder.

[0027] The BiFeO prepared by the present embodiment is analyzed by X-ray diffractometer 3 Ceramic samples were analyzed. The result is as figure 1 shown, indicating that BiFeO 3 The ceramic crystallizes well.

Embodiment 2

[0029] Bi 3 TaTiO 9 The preparation of ceramic powder can refer to [Y.Noguchi, R.Satoh, M.Miyayama, K.Tetsuichi, J.Ceram.Soc.Jpn.109,29(2001)]

[0030] In this example, Ta 2 o 5 、 Bi 2 o 3 、TiO 2 Powder preparation Bi 3 TaTiO 9 ceramics. Ball milled in a ball mill with a rotating speed of 300r / min for 4 hours and dried to obtain Bi with more than 80% particles of nanometer diameter 3 TaTiO 9 Ceramic powder. Brush the upper and lower surfaces of the fired ceramic samples with silver electrodes, place them in methyl silicone oil, and apply a high-voltage electric field for polarization. The polarization electric field is 150kV / cm, and the polarization time is 30 minutes.

[0031] With X-ray diffractometer to the Bi that present embodiment makes 3 TaTiO 9 Ceramic samples were analyzed. The result is as figure 1 It shows that the ceramic crystallization is good.

[0032] quasi-static d 33 Tester is to the Bi after the embodiment polarization 3 TaTiO 9 Ceramic sa...

Embodiment 3

[0035] This embodiment uses the BiFeO of embodiment 1 3 Powder and the Bi of Example 2 3 TaTiO 9 Powder preparation Bi 3 TaTiO 9 -20wt% BiFeO 3 For ceramics, the sintering temperature is 750°C.

[0036] The preparation steps are:

[0037] 1. the BiFeO in embodiment 1 3 Bi in ceramic powder and embodiment 2 3 TaTiO 9 Ceramic powder according to Bi 3 TaTiO 9 -20wt% BiFeO 3 Weigh it and put it into a planetary ball mill for low-speed ball milling for 1 hour.

[0038] 2. After ball milling, take out the slurry, dry it, and 3 TaTiO 9 -20wt% BiFeO 3 Add polyvinyl alcohol solution to the powder as a binder, grind it again and press it into a ceramic disc.

[0039] 3. After debinding the pressed ceramic disc at 550°C for 3 hours, raise the temperature to 750°C for sintering at a rate of 80°C / min. temperature to room temperature to prepare ceramic samples. The sample number is No. 1.

[0040] 4. Brush the upper and lower surfaces of the ceramic sheets fired in step 3 ...

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Abstract

The invention discloses a composite high-temperature piezoelectric ceramic material. The ceramic material composition is represented by the general formula Bi 3 tO 9 ‑xBiFeO 3 to represent, where x is BiFeO 3 with Bi 3 tO 9 weight percentage, and x=20wt%~50wt%. The preparation process of the materials is as follows: first, Bi is synthesized separately 3 tO 9 Powder and BiFeO 3 powder, and then Bi 3 tO 9 Ceramic powder and BiFeO 3 Ceramic powder is ball milled, mixed and sintered into porcelain. Piezoelectric constant d of the composite high-temperature piezoelectric ceramic material of the present invention 33 Reaching 24pC / N, it is single-phase Bi 3 tO 9 1.8 times that of ceramic materials. It has a large resistivity in a high temperature environment of 500℃, and ρ is about 10 4 Ω·m. The composite ceramic material of the present invention is suitable for preparing piezoelectric actuators and piezoelectric sensors used in high-temperature environments.

Description

technical field [0001] The invention belongs to the technical field of inorganic piezoelectric materials, and relates to a composite high-temperature piezoelectric ceramic material, in particular to a composite lead-free piezoelectric ceramic material used in the high-temperature environment field. Background technique [0002] With the rapid development of aerospace, automobile, metallurgy and petrochemical industries, automatic monitoring of jet engines and nuclear power generation, as well as many special fields such as aerospace, satellite, missile automatic control, automotive engine fuel monitoring, etc. Piezoelectric sensing devices that work at high temperatures without failure. [0003] As a high-temperature piezoelectric ceramic with a bismuth layer structure, it has the following characteristics: high Curie temperature, low aging rate, excellent insulation resistance and withstand voltage characteristics, high mechanical Quality factor. Among them Bi 3 TaTiO 9...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187C04B35/475C04B35/622H10N30/853
CPCC04B35/475C04B35/622C04B2235/3298C04B2235/3272C04B2235/3251
Inventor 张伟飞袁国亮穆罕默德·阿德南·凯瑟
Owner NANJING UNIV OF SCI & TECH
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