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Zinc doped sodium-based leadless piezoelectric ceramic synthesized at low-temperature and manufacturing method thereof

A potassium sodium niobate-based, lead-free piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve problems such as reducing the normal pressure sintering temperature

Inactive Publication Date: 2008-12-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the relevant patents found, it has not been seen that in the KNN system by adding ZnO, ZnCO 3 and a report on lowering the sintering temperature at atmospheric pressure with basic zinc carbonate

Method used

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  • Zinc doped sodium-based leadless piezoelectric ceramic synthesized at low-temperature and manufacturing method thereof
  • Zinc doped sodium-based leadless piezoelectric ceramic synthesized at low-temperature and manufacturing method thereof
  • Zinc doped sodium-based leadless piezoelectric ceramic synthesized at low-temperature and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to 0.997 (Na 0.2 K 0..8 Li 0.019 )NbO 3 +0.001ZnO (a=0.2, b=0.8, c=0.019, x=0.001) formula, weigh 0.299 grams of Na with an electronic balance 2 CO 3 , 1.561 g K 2 CO 3 , 0.021 g Li 2 CO 3 , 3.755 g Nb 2 o 5 And 0.041 g of ZnO, using absolute ethanol as the ball milling medium, mixed with a planetary ball mill for 24 hours at a speed of 300 rpm, and dried the slurry at 80° C. for 12 hours. The dry powder was kept at 700°C for 10 hours to synthesize niobate powder. Take 0.3 grams of powder and put it into a Φ10mm mold, and press it into shape. The formed discs were put into a programmed temperature-controlled box furnace for sintering at a temperature of 1000° C., kept for 2 hours, and then lowered to room temperature to obtain ceramic discs. After grinding with 600-mesh fine sandpaper, evenly coat the upper and lower surfaces with silver paste, put them in a box furnace, and keep them warm at 520°C for 30 minutes to make baked silver ceramic sheets...

Embodiment 2

[0025] According to 0.99 (Na 0.405 K 0.587 Li 0.114 )NbO 3 +0.01ZnO (a=0.405, b=0.587, c=0.114, x=0.01) formula, weigh 0.609 grams of Na with an electronic balance 2 CO 3 , 1.151 g K 2 CO 3 , 0.120 g Li 2 CO 3 , 3.809 g Nb 2 o 5 and 0.627 g of ZnCO 3 , with absolute ethanol as the medium, mixed with a planetary ball mill for 3 hours at a speed of 300 rpm, and dried the slurry at 80° C. for 12 hours. The dry powder was kept at 900°C for 2 hours to synthesize niobate powder. Take 0.3 grams of powder and put it into a Φ10mm mold, and press it into shape. The formed discs were sintered in a programmed temperature-controlled box furnace, kept at 960° C. for 3 hours, and then lowered to room temperature to obtain ceramic discs. After grinding with 600-mesh fine sandpaper, evenly coat the upper and lower surfaces with silver paste, put them in a box furnace, and keep them warm at 520°C for 30 minutes to make baked silver ceramic sheets. The baked silver ceramic sheet wa...

Embodiment 3

[0027] According to 0.95 (Na 0.8 K 0.2 Li 0.3 )NbO 3+0.100ZnO (a=0.8, b=0.2, c=0.3, x=0.100) formula, weigh 1.093 grams of Na with electronic balance 2 CO 3 , 0.356 g K 2 CO 3 , 0.286 g Li 2 CO 3 , 3.808 g Nb 2 o 5 And 6.27 g of basic zinc carbonate, with absolute ethanol as the medium, was ground and mixed with a planetary ball mill for 12 hours at a speed of 300 rpm, and the slurry was dried at 80° C. for 12 hours. The dry powder was kept at 750°C for 4 hours to synthesize niobate powder. Take 0.3 grams of powder and put it into a Φ10mm mold, and press it into shape. The formed discs were sintered in a programmed temperature-controlled box furnace, kept at 800° C. for 4 hours, and then lowered to room temperature to obtain ceramic discs. After grinding with 600-mesh fine sandpaper, evenly coat the upper and lower surfaces with silver paste, put them in a box furnace, and keep them warm at 520°C for 30 minutes to make baked silver ceramic sheets. The baked silver...

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Abstract

The invention provides a zinc-doped potassium sodium niobate based lead free piezoelectric ceramic material synthesized at a low temperature, belonging to the environment-friendly functional ceramic material field. The composition is (1-x)(NaaKbLic)NbO3+xZnO, wherein, a(1-x), b(1-x), c(1-x) and x respectively represent the molar fraction of components of Na, K, Li and Zn, a is more than or equal to 0.20 and less than or equal to 0.80, b is more than or equal to 0.20 and less than or equal to 0.80, c is more than or equal to 0.00 and less than or equal to 0.30, and x is more than or equal to 0.00 and less than or equal to 0.30. The preparation method comprises the process steps of weighing raw materials, mixing, baking, forming, sintering, baking silver and polarizing, etc. The material has the advantages that the sintering temperature of the potassium sodium niobate based lead free piezoelectric ceramics is effectively reduced by doping ZnO, ZnCO3 or alkali cadmia, and the potassium sodium niobate based lead free piezoelectric ceramic sample with good performance is synthesized at a low temperature of between 900 and 1,200 DEG C.

Description

technical field [0001] The invention belongs to the field of functional ceramic materials, and particularly provides a low-temperature synthesis of zinc-doped potassium sodium niobate-based lead-free piezoelectric ceramics and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are an important class of high-tech materials widely used in the electronics industry. However, lead-based piezoelectric ceramics are currently used on a large scale, and the Pb content is as high as 60%, which will cause harm to human health and the living environment during its preparation, use, and disposal. Research on environment-friendly lead-free piezoelectric ceramics is an urgent and socially important topic. [0003] In the lead-free piezoelectric ceramic system, the niobate-based lead-free piezoelectric ceramic (K, Na)NbO 3 (abbreviated as KNN), because of its high Curie temperature and good piezoelectric properties, it is considered to be one of the most po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622H01L41/187H10N30/853
Inventor 张波萍李海涛张倩赵高磊
Owner UNIV OF SCI & TECH BEIJING
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