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Sodion compensating potassium and sodium niobate based leadless piezoelectric ceramics and method for preparing same

A potassium-sodium niobate-based, lead-free piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problem of lowering the sintering temperature, high lead-free piezoelectric ceramics, and See and other problems, to achieve the effect of reducing the sintering temperature

Inactive Publication Date: 2008-10-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In summary, the pressureless sintering temperature of lead-free piezoelectric ceramics with good performance is higher than 1050 °C
And according to the relevant patents found, it is not seen that in the KNN system, the existing component Na in the original ceramics is added excessively. + , with Na 2 O, Na 2 CO 3 and sodium bicarbonate added to reduce the sintering temperature

Method used

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  • Sodion compensating potassium and sodium niobate based leadless piezoelectric ceramics and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to (Na 0.211+0.001 K 0.77 Li 0.019 )NbO 3 (x=0.001) formula, weigh 0.389gNa respectively with electronic balance 2 CO 3 , 1.812gK 2 CO 3 , 0.024gLi 2 CO 3 , and 4.533gNb 2 o 5 , using absolute ethanol as the medium, grinding and mixing the materials with a planetary ball mill for 24 hours at a speed of 250 rpm, and drying the slurry at 80° C. to obtain dry powder. The dry powder was subjected to 700°C and kept for 10 hours to synthesize niobate. Take 0.3g 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, sintered at 1000° C., kept for 2 hours, and cooled to room temperature to obtain ceramic discs. After grinding with 600-mesh fine sandpaper, coat both surfaces with baked silver electrodes to make baked silver ceramic sheets, put them in silicone oil and heat to 100°C, keep at 5kV / mm voltage for 20min for polarization, and then cool down to room temper...

Embodiment 2

[0023] According to (Na 0.732+0.20 K 0.204 Li 0.064 )NbO 3 (x=0.20) formula, weigh 0.84gNa respectively with electronic balance 2 O, 0.507gK 2 CO 3 , 0.085gLi 2 CO 3 , and 4.786gNb 2 o 5 , using absolute ethanol as the medium, grinding and mixing the materials with a planetary ball mill for 3 hours at a rotation speed of 250 rpm, and drying the slurry at 80° C. to obtain dry powder. The dry powder was subjected to 750°C and kept for 7 hours to synthesize niobate. Take 0.3g 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, sintered at 800° C., kept for 5 hours, and cooled to room temperature to obtain ceramic discs. After grinding with 600-mesh fine sandpaper, apply baked silver electrodes on both surfaces to make baked silver ceramic sheets, put them in silicone oil and heat to 200°C, keep at 5kV / mm voltage for 30min for polarization, and then cool down to room temperat...

Embodiment 3

[0025] According to (Na 0.516+0.01- K 0.446 Li 0.038 )NbO 3 (x=0.01) formula, weigh 1.553gNaHCO respectively with electronic balance 3 , 1.082gK 2 CO 3 , 0.049gLi 2 CO 3 , and 4.673gNb 2 o 5 , using absolute ethanol as the medium, grinding and mixing the materials with a planetary ball mill for 12 hours at a speed of 250 rpm, and drying the slurry at 80° C. to obtain dry powder. The dry powder was subjected to 850°C and kept for 5 hours to synthesize niobate. Take the powder for 0.3h, put it into a Φ10mm mold, and press to form it. The formed discs were sintered in a programmed temperature-controlled box furnace, sintered at 940° C., kept for 4 hours, and cooled to room temperature to obtain ceramic discs. After grinding with 600-mesh fine sandpaper, coat both surfaces with baked silver electrodes to make baked silver ceramic sheets, heat them in silicone oil to 140°C, keep at 4kV / mm voltage for 50min for polarization, and then cool down to room temperature to compl...

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Abstract

The invention relates to Na<+> compensatory potassium-sodium niobate lithium base leadless piezoelectric ceramics and a low-temperature sintering method thereof, which belongs to the filed of functional ceramic materials. The general formula of chemical composition can be represented as (Naa+xKbLic)NbO3; wherein, a, b, and c represent the molar fraction of the components such as Na, K, Li respectively; and a plus b plus c equals to 1; x represent the molar fraction of the compensatory Na<+>; the value range of each parameter is that: a is more than 0.20 and less than 0.80, b is more than 0.20 and less than 0.80, c is more than 0.00 and less than 0.30, and x is more than 0.00 and equal or less than 0.20. The preparation method of the ceramics system comprises the processing steps of mixing raw materials, baking, molding, sintering, baking sliver and polarization, etc. The Na<+> compensatory potassium-sodium niobate lithium base leadless piezoelectric ceramics and the low-temperature sintering method of the invention have the advantages of effectively reducing the baking temperature of potassium-sodium niobate lithium base leadless piezoelectric ceramics by the compensation of Na<+> and preparing leadless piezoelectric ceramics with good property material at the low temperature of 800 to 1000 DEG C.

Description

technical field [0001] The invention belongs to the field of functional ceramic materials, and particularly provides a low-temperature synthesis of sodium-compensated potassium niobate-based lead-free piezoelectric ceramics and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are an important class of high-tech materials that are widely used. However, lead-based piezoelectric ceramics are currently used on a large scale. Because their lead content is as high as 60%, they are harmful to humans and humans during preparation, application, and disposal. It poses serious hazards to its living environment. Therefore, the research and development of lead-free piezoelectric ceramics is undoubtedly an urgent task with great social and economic significance. [0003] In the lead-free piezoelectric ceramic system, potassium sodium niobate-based lead-free piezoelectric ceramics (K, Na)NbO 3 (abbreviated as KNN), because of its high Curie temperature a...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622H01L41/187
Inventor 张波萍李海涛范烨张倩
Owner UNIV OF SCI & TECH BEIJING
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