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Potassium-sodium niobate-based leadless piezoelectric material and preparation thereof

A potassium-sodium niobate-based, lead-free piezoelectric technology is applied in the field of functional ceramic preparation, which can solve the problems of inability to obtain compactness, reduce the temperature stability of piezoelectric properties of potassium-sodium niobate-based ceramics, and achieve enhanced overall electrical properties. , The effect of increasing the upper limit of sintering temperature and reducing polarization leakage current

Inactive Publication Date: 2008-11-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the existing in the prior art or can not obtain the ceramic body with good compactness, or introduce BaTiO 3 , SrTiO 3 , LiNbO 3 , LiTaO 3 Finally, make the phase transition temperature from 200 ℃ to room temperature, thereby greatly reducing the temperature stability of these new potassium sodium niobate-based ceramic piezoelectric performance deficiency, the present invention proposes a potassium sodium niobate-based lead-free piezoelectric Ceramic piezoelectric material and preparation method thereof

Method used

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  • Potassium-sodium niobate-based leadless piezoelectric material and preparation thereof
  • Potassium-sodium niobate-based leadless piezoelectric material and preparation thereof
  • Potassium-sodium niobate-based leadless piezoelectric material and preparation thereof

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Embodiment 1

[0025] The raw material of present embodiment comprises anhydrous potassium carbonate, anhydrous sodium carbonate, niobium pentoxide and bismuth trioxide, and its stoichiometric ratio is (K 0.5 Na 0.5 )NbO 3 .

[0026] The preparation process of this embodiment is:

[0027] (1) Analytical pure anhydrous potassium carbonate, anhydrous sodium carbonate, and niobium pentoxide were dried at 150°C for 5 hours, and the stoichiometric ratio was (Na 0.5 K 0.5 )NbO 3 ingredients.

[0028] (2) The raw material is ZrO in ethanol 2The ball is a medium planetary ball mill for 24 hours, dried and ground to obtain a dry powder. Keep the obtained powder in the air at 900°C for 5 hours. The calcined powder is manually ground and calcined again in the air at 900°C for 5 hours. After grinding and sieving, the potassium sodium niobate powder with perovskite phase is obtained.

[0029] (3) Put the pre-burned potassium sodium niobate powder in ethanol for another 12 hours and mix it by plan...

Embodiment 2

[0036] The raw material of present embodiment comprises anhydrous potassium carbonate, anhydrous sodium carbonate, niobium pentoxide and bismuth trioxide, and its stoichiometric ratio is (K 0.5 Na 0.5 )NbO 3 -0.1wt% Bi 2 o 3 .

[0037] The preparation process of this embodiment is:

[0038] (1) Analytical pure anhydrous potassium carbonate, anhydrous sodium carbonate, and niobium pentoxide were dried at 150°C for 5 hours, and the stoichiometric ratio was (Na 0.5 K 0.5 )NbO 3 ingredients.

[0039] (2) The raw material is ZrO in ethanol 2 The ball is a medium planetary ball mill for 24 hours, dried and ground to obtain a dry powder. Keep the obtained powder in the air at 850°C for 4 hours. The calcined powder is manually ground and calcined again in the air at 950°C for 4 hours. After grinding and sieving, the potassium sodium niobate powder with perovskite phase is obtained.

[0040] (3) the potassium sodium niobate powder and bismuth trioxide will be calcined accordi...

Embodiment 3

[0047] The raw material of present embodiment comprises anhydrous potassium carbonate, anhydrous sodium carbonate, niobium pentoxide and bismuth trioxide, and its stoichiometric ratio is (K 0.5 Na 0.5 )NbO 3 -0.3wt% Bi 2 o 3 .

[0048] The preparation process of this embodiment is:

[0049] (1) Analytical pure anhydrous potassium carbonate, anhydrous sodium carbonate, and niobium pentoxide were dried at 150°C for 5 hours, and the stoichiometric ratio was (Na 0.5 K 0.5 )NbO 3 ingredients.

[0050] (2) The raw material is ZrO in ethanol 2 The ball is a medium planetary ball mill for 24 hours, dried and ground to obtain a dry powder. Keep the obtained powder in the air at 900°C for 5 hours. The calcined powder is manually ground and calcined again in the air at 900°C for 5 hours. After grinding and sieving, the potassium sodium niobate powder with perovskite phase is obtained.

[0051] (3) the potassium sodium niobate powder and bismuth trioxide will be calcined accordi...

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Abstract

The invention discloses a piezoelectric material for lead-free piezoelectric ceramic with potassium-sodium niobate and a preparing method, which strengthens the ferroelectric performance of potassium-sodium niobate ceramic and further improves the piezoelectric performance. The material of the invention comprises anhydrous potassium carbonate, natrium carbonicum calcinatum, niobium pentaoxide and dibismuth trioxide, the stoichiometric proportion of the lead-free piezoelectric ceramic is (K0.5 Na0.5) Nb3 + x weight percent Bi 2O3, wherein the x is more than or equal to 0 and less than or equal to 1, the piezoelectric material for lead-free piezoelectric ceramic with potassium-sodium niobate is obtained through mixture making, drying and burnishing, granulation, molding, sintering and after polarization by a silver electrode; therefore, the densification of the ceramic is improved, polarized drain current of the ceramic is reduced, and the polarization process is carried out more easily; moreover, the piezoelectric material adopts the material from a conventional process and industry, has the characteristics of good process stability and no pollution.

Description

1. Technical field [0001] The invention relates to the technical field of preparation of functional ceramics, in particular to a potassium sodium niobate-based lead-free piezoelectric ceramic piezoelectric material and a preparation method thereof. 2. Background technology [0002] Piezoelectric ceramics are increasingly used in commercial, military, automotive, computer, medical and consumer fields due to their unique properties. For a long time, the research and production of piezoelectric ceramics have mainly focused on the traditional lead zirconate titanate Pb(Zr,Ti)O 3 (referred to as PZT) series piezoelectric ceramics. However, traditional lead zirconate titanate ceramics are a class of lead-containing ceramics, in which lead oxide (or lead tetraoxide) accounts for about 70% of the total mass of raw materials. Piezoelectric ceramics containing lead will cause great damage to the environment and human health in the process of preparation, use and disposal. With the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/634C04B35/64
Inventor 杜红亮刘代军周万城罗发朱冬梅苏晓磊王晓燕
Owner NORTHWESTERN POLYTECHNICAL UNIV
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