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Sodium potassium tantalate niobate -base piezoelectric ceramic and process for preparing same

A technology of potassium sodium niobate tantalate and electric ceramics, which is applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of low mechanical quality factor and low electromechanical coupling coefficient, and achieve improved The effect of the overall electrical performance

Inactive Publication Date: 2007-12-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the deficiencies of low mechanical quality factor and low electromechanical coupling coefficient of niobate piezoelectric ceramics in the prior art, the present invention provides a potassium niobate tantalate-based piezoelectric ceramic, which is obtained by doping Cu 2+ , Sb 5+ , Sn 4+ and Li + Metal ions to improve the mechanical quality factor and electromechanical coupling coefficient of niobate piezoelectric ceramics

Method used

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  • Sodium potassium tantalate niobate -base piezoelectric ceramic and process for preparing same

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1, weigh 3.9200 grams of potassium carbonate, 3.0086 grams of sodium carbonate, 14.3208 grams of niobium oxide, 1.2531 grams of tantalum oxide as base material, weigh 0.1098 grams of copper nitrate trihydrate as auxiliary material, then prepare the base material and auxiliary material together Put it into a ball mill tank, use absolute ethanol as the ball milling medium, and mix it by ball milling for 12 hours. After mixing evenly, use one-step synthesis to ensure the uniformity of material components. The synthesis temperature is 800°C and the holding time is 10 hours. After secondary ball milling for 24 hours, the obtained clinker is pressed into a circular green body with a diameter of about 15 mm and a thickness of about 1.5 mm under cold isostatic pressure of 100 MPa. The green body is kept in air at a temperature of 1200 ° C for 2 hours. Firing ceramics. After finishing the obtained ceramics, burn infiltrated silver electrodes at 550°C, then apply a DC ...

Embodiment 2

[0025] Embodiment 2, weigh 3.9203 grams of potassium carbonate, 3.0070 grams of sodium carbonate, 14.3203 grams of niobium oxide, and 1.2530 grams of tantalum oxide as the base material, then weigh 0.0548 grams of copper nitrate trihydrate, and load the prepared base material and auxiliary materials together In a ball milling tank, absolute ethanol was used as the ball milling medium, and mixed for 12 hours. After mixing evenly, a one-step synthesis method was used to ensure the uniformity of the material composition. The synthesis temperature was 850°C, and the holding time was 7 hours. After secondary ball milling for 24 hours, the obtained clinker is cold isostatically pressed at 80 MPa to form a disc with a diameter of about 15 mm and a thickness of about 1.5 mm. Firing ceramics. The obtained ceramics were polished and infiltrated with silver electrodes at 550°C, then polarized by applying a DC electric field of 3kV / mm in silicone oil at 130°C for 20 minutes, and measured ...

Embodiment 3

[0027] Example 3, weigh 3.9205 grams of potassium carbonate, 3.0075 grams of sodium carbonate, 14.3206 grams of niobium oxide, and 1.2533 grams of tantalum oxide as the base material, then weigh 0.1661 grams of copper nitrate trihydrate, and load the prepared base material and auxiliary materials together In a ball milling tank, absolute ethanol was used as the ball milling medium, and ball milling was performed for 12 hours. After mixing evenly, a one-step synthesis method was used to ensure the uniformity of the material composition. The synthesis temperature was 900°C, and the holding time was 4 hours. After secondary ball milling for 24 hours, the obtained clinker is cold isostatically pressed under 50 MPa pressure to form a circular green body with a diameter of about 15 mm and a thickness of about 1.5 mm. The green body is kept in air at 1000 ° C for 4 hours to laminate Firing ceramics. After finishing the obtained ceramics, burn infiltrated silver electrodes at 550°C, t...

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Abstract

The invention discloses a sodium potassium base tantalite-niobate piezo-electric ceramics,which comprises the following parts: potash, sodium carbonate, niobate oxide and tantalum oxide and one or more of 0.2-0.8 mol% Cu2+, Sb5+, Sn4+, Li+ in the base material, wherein the base material chemical gauge is (K1-xNax)(Nb1-yTay)O3 (x=0.1-0.9,y=0.01-0.30).The preparing method of sodium potassium base tantalite-niobate piezo-electric ceramics comprises the following steps: loading raw material in the balling tank to synthesize at 800-900 deg.c; insulating for 4-10 h; pressing clinker into disk biscuit under 50-100MPa isostatic cool pressing; overlapping and sintering into ceramics at 1000-1200 deg.c for 2-4h; burning silver electrode; polarizing.

Description

technical field [0001] The invention relates to a potassium-sodium niobate tantalate-based piezoelectric ceramic, and also relates to a preparation method of the potassium-sodium niobate-tantalate-based piezoelectric ceramic. Background technique [0002] Piezoelectric ceramic materials have stable chemical properties, are easy to prepare, and can produce products of various shapes, sizes and arbitrary polarization directions. Ceramics with different characteristics suitable for different needs can be obtained through doping or substitution modification, and the price Inexpensive and thus widely used. [0003] Among the many lead-free piezoelectric ceramics (K x Na 1-x )NbO 3 Based piezoelectric ceramics are currently considered to be the most promising piezoelectric ceramic materials. Literature "Alkaline-earth doping in (K, Na) NbO 3 based piezoeeramies, Journal of the European Ceramic Society 25 (2005) 2707-2711 "reported a preparation method utilizing traditional p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622H01L41/187H10N30/853
Inventor 樊慧庆焦岗成刘来君王炜
Owner NORTHWESTERN POLYTECHNICAL UNIV