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Potassium-sodium niobate based leadless piezoelectric ceramic and preparation method thereof

A potassium-sodium niobate-based, lead-free piezoelectric technology, applied in the field of functional ceramic materials, can solve problems such as unfavorable industrial applications and sensitivity to temperature changes

Active Publication Date: 2016-01-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PPT is regulated by both temperature and composition, which makes the piezoelectric response of the material more sensitive to temperature changes, which is not conducive to its industrial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Raw material: 2.4840gK 2 CO 3 , 1.9080gNa 2 CO 3 , 19.1520gNb 2 o 5 , 1.0027gBi 2 o 3 , 0.1525gLi 2 CO 3 , 0.3840gTiO 2 , 0.4728gBaCO 3 , 0.2952gZrO 2 , 0gMnO 2 .

[0036] 1. Mix the above prepared raw materials, add absolute ethanol as the medium, ball mill for 24 hours, and dry the obtained slurry to obtain the mixed powder;

[0037] 2. Pre-sinter the mixed powder at a temperature of 1000°C for 4 hours in an air atmosphere;

[0038] 3. Add the pre-sintered mixed powder into absolute ethanol as the medium, ball mill again for 24 hours, and dry the obtained slurry to obtain the mixed powder for the second ball mill;

[0039] 4. Cold-press the mixed powder from the second ball mill into a disc with a diameter of 10mm and a thickness of 1.5mm to obtain a rough ceramic body;

[0040] 5. Sinter the rough ceramic body at a temperature of 1250°C in an oxygen atmosphere for 3 hours to obtain a ceramic sample;

[0041] 6. Evenly coat both ends of the ceramic sam...

Embodiment 2

[0044] Raw material: 2.5958gK 2 CO 3 , 1.9429gNa 2 CO 3 , 20.0141gNb 2 o 5 , 0.3417gBi 2 o 3 , 0.0872gLi 2 CO 3 , 0.2432gTiO 2 , 0.3152gBaCO 3 , 0.3936gZrO 2 , 0.1740gMnO 2 .

[0045] 1. Mix the above prepared raw materials, add absolute ethanol as the medium, ball mill for 24 hours, and dry the obtained slurry to obtain the mixed powder;

[0046] 2. Pre-sinter the mixed powder at a temperature of 900°C for 4 hours in an air atmosphere;

[0047] 3. Add the pre-sintered mixed powder into absolute ethanol as the medium, ball mill again for 24 hours, and dry the obtained slurry to obtain the mixed powder for the second ball mill;

[0048] 4. Cold-press the mixed powder from the second ball mill into a disc with a diameter of 10mm and a thickness of 1.5mm to obtain a rough ceramic body;

[0049] 5. Sinter the rough ceramic body at a temperature of 1200°C in an oxygen atmosphere for 2 hours to obtain a ceramic sample;

[0050] 6. Coat both ends of the ceramic sample...

Embodiment 3

[0053] Raw material: 2.5392gK 2 CO 3 , 1.9504gNa 2 CO 3 , 19.3677gNb 2 o 5 , 0.5524gBi 2 o 3 , 0.0691gLi 2 CO 3 , 0.1943gTiO 2 , 0.7880gBaCO 3 , 0.4920gZrO 2 , 0.2595gMnO 2 .

[0054] 1. Mix the above prepared raw materials, add absolute ethanol as the medium, ball mill for 18 hours, and dry the obtained slurry to obtain the mixed powder;

[0055] 2. Pre-sinter the mixed powder at a temperature of 900°C for 4 hours in an air atmosphere;

[0056] 3. Add the pre-sintered mixed powder into absolute ethanol as the medium, ball mill for 18 hours again, and dry the obtained slurry to obtain the mixed powder for secondary ball milling;

[0057]4. Cold-press forming the mixed powder of the secondary ball mill into a disc with a diameter of 10 mm and a thickness of 1.0 mm to obtain a rough ceramic blank;

[0058] 5. Sinter the rough ceramic blank at a temperature of 1150°C in an oxygen atmosphere for 3 hours to obtain a ceramic sample;

[0059] 6. Coat both ends of the ...

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PUM

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Abstract

The invention relates to potassium-sodium niobate based leadless piezoelectric ceramic and a preparation method thereof and belongs to the field of functional ceramic materials. The chemical formula of the ceramic is as follows: (ABO3)1-x(BaZrO3)y(MnO2)y. The preparation method is as follows: K2CO3, Na2CO3, Nb2O5, Bi2O3, Li2CO3, TiO2, BaCO3, ZrO2 and MnO2 are mixed, absolute ethyl alcohol is added, the mixture is subjected to ball milling and dried, then mixed powder is obtained, and the powder is pre-sintered; absolute ethyl alcohol is added to the sintered powder, the mixture is subjected to ball milling again and dried, and mixed powder is obtained; the mixed powder is subjected to cold press molding, rough ceramic blank is obtained and sintered, and a ceramic sample is obtained; the ceramic sample is subjected to polarization treatment, and the potassium-sodium niobate based leadless piezoelectric ceramic is obtained. The prepared potassium-sodium niobate based leadless piezoelectric ceramic has excellent piezoelectric performance and temperature stability.

Description

technical field [0001] The invention belongs to the field of functional ceramic materials, in particular to a high-performance lead-free piezoelectric ceramic and a preparation method thereof. Background technique [0002] Piezoelectric ceramic materials are widely used in military, medical, and industrial fields due to their ability to convert electrical energy and mechanical energy. Applications include ultrasonic transducers, piezoelectric sensors, ultrasonic motors, precise positioning devices, and piezoelectric drives. In practical applications, materials are often required to have good piezoelectric performance and electromechanical coupling performance, and sometimes it is required that the material can provide a large driving force while generating a large strain, which puts forward high requirements on the service performance of the material. Require. At present, lead zirconate titanate (PZT)-based piezoelectric ceramic materials occupy almost the entire market due...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
Inventor 王轲张茂华姚方周李敬锋
Owner TSINGHUA UNIV
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