Low temperature synthesized no-lead piezoelectric Mg doped sodium potassium niobate ceramic and its prepn process

A potassium-sodium niobate-based, lead-free piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problem of reducing the pressureless sintering temperature, lead-free piezoelectric ceramics, etc. question

Inactive Publication Date: 2007-11-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 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 potassium sodium niobate system, by adding MgO, MgCO 3 and a report on reducing the temperature of pressureless sintering with basic magnesium carbonate

Method used

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  • Low temperature synthesized no-lead piezoelectric Mg doped sodium potassium niobate ceramic and its prepn process

Examples

Experimental program
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Effect test

Embodiment 1

[0019] According to (Na 0.263 K 0.772 Li 0.057 )NbO 3 +0.044MgO (a=0.263, b=0.772, c=0.057, x=0.044) formula, weigh 0.3195 grams of Na with electronic balance 2 CO 3 , 1.2227 g K 2 CO 3 , 0.0483 g Li 2 CO 3 , 2.9122 g Nb 2 o 5 and 0.0406 g of MgO, using absolute ethanol as a medium, grinding and mixing with a planetary ball mill for 8 hours at a speed of 100 rpm, and drying the slurry at 50° C. to obtain a dry powder. The dry powder was subjected to 500°C and kept for 9 hours to synthesize niobate. Take 0.3 grams of powder and put it into a Φ10mm mold, and press it into shape. The shaped discs were sintered in a programmed temperature-controlled box-type furnace, sintered at 1040° C., kept for 1 hour, and cooled to room temperature to obtain ceramic discs. After grinding with 600-mesh fine sandpaper, coat the two surfaces with baked silver electrodes to make a silver ceramic sheet, put it into the polarization device, heat the silicone oil to 100°C, keep it at 5kV / ...

Embodiment 2

[0021] According to (Na 0.539 K 0.467 Li 0.114 )NbO 3 +0.187MgO (a=0.539, b=0.467, c=0.114, x=0.187) formula, weigh 0.7163 grams of Na with electronic balance 2 CO 3 , 0.8092 g K 2 CO 3 , 0.1056 g Li 2 CO 3 , 2.7093 g Nb 2 o 5 and 0.1977 g of MgCO 3 , using absolute ethanol as the medium, grinding and mixing the materials with a planetary ball mill for 4 hours at a rotation speed of 250 rpm, and drying the slurry at 120° C. to obtain dry powder. The dry powder was subjected to temperature at 650°C for 4 hours to synthesize niobate. Take 0.3 grams of powder and put it into a Φ10mm mold, and press it into shape. The shaped discs were put into a programmed temperature-controlled box furnace for sintering at 960° C., kept for 2 hours, and cooled to room temperature to obtain ceramic discs. After grinding with 600-mesh fine sandpaper, coat the two surfaces with baked silver electrodes to make a silver ceramic sheet, put it into the polarization device, heat the silicon...

Embodiment 3

[0023] According to (Na 0.539 K 0.467 Li 0.001 )NbO 3 +0.187MgO (a=0.674, b=0.318, c=0.001, x=0.3) formula, weigh 0.7199 grams of Na with electronic balance 2 CO 3 , 0.8132 g K 2 CO 3 , 0.009 g Li 2 CO 3 , 2.7229 g Nb 2 o 5 and 0.0380 g of basic magnesium carbonate, using absolute ethanol as a medium, grinding and mixing with a planetary ball mill for 1 hour at a speed of 450 rpm, and drying the slurry at 200° C. to obtain dry powder. The dry powder was subjected to 900°C and kept for 1 hour to synthesize niobate. Take 0.3 grams of powder and put it into a Φ10mm mold, and press it into shape. The shaped discs were sintered in a programmed temperature-controlled box furnace, sintered at 800° C., kept for 4 hours, and cooled to room temperature to obtain ceramic discs. After grinding with 600-mesh fine sandpaper, coat the two surfaces with baked silver electrodes to make a silver ceramic sheet, put it into the polarization device, heat the silicone oil to 200°C, keep...

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Abstract

The low temperature synthesized no-lead piezoelectric Mg doped sodium potassium niobate ceramic as one kind of environment friendly material has the composition formula of (NaaKbLic)NbO3+xMgO, where, a, b, c and x are the molar fractions of Na, K, Li, Mg separately, a is 0.20-0.80, b is 0.20-0.80, c is 0.00-0.30, and x is 0.00-0.30. Its preparation process includes the technological steps of mixing material, roasting, forming, sintering, coating silver, polarizing, etc. The low temperature synthesized no-lead piezoelectric Mg doped sodium potassium niobate ceramic of the present invention has the advantages of sintering temperature effectively lowered to 800-1040 deg.c and high performance.

Description

technical field [0001] The invention belongs to the field of environment-friendly materials for functional ceramics, and particularly provides a low-temperature synthesized magnesium-doped potassium sodium niobate-based lead-free piezoelectric ceramic and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are an important class of high-tech materials that are widely used, but lead-based piezoelectric ceramics are currently used on a large scale, which poses serious harm to humans and the ecological environment. Research and development of lead-free piezoelectric ceramics has become an urgent topic with social and economic significance. In the lead-free piezoelectric ceramic system, niobate-based lead-free piezoelectric ceramics (K, Na)NbO 3 , because of its high Curie temperature and piezoelectric properties, is considered to be one of the most promising materials to replace lead-based piezoelectric ceramics. It is expected to improve its per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622H01L41/187
Inventor 张波萍徐婕慧赵培
Owner UNIV OF SCI & TECH BEIJING
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