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Production method of potassium sodium niobate/sodium bismuth titanate composite-phase piezoelectric ceramic

A sodium bismuth titanate and lead-free piezoelectric technology, applied in the field of functional ceramics, can solve the problem of undiscovered potassium sodium niobate/bismuth sodium titanate complex phase lead-free piezoelectric ceramics, etc., and achieve good commercial value and excellent electromechanical properties. Performance, effect of solving environmental load

Inactive Publication Date: 2013-10-23
SHANGHAI LONGTIAN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After searching the literature of the prior art, no report was found on the production of potassium sodium niobate / bismuth sodium titanate composite phase lead-free piezoelectric ceramics by spark plasma sintering process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The compounding ratio (mol percentage) of the five raw materials is: 47.5% of potassium niobate, 47.5% of sodium niobate, 1.25% of sodium carbonate, 1.25% of bismuth trioxide, and 5% of titanium dioxide. Ball milling and mixing, adding 5% polyvinyl alcohol (PVA) to granulate, and dry pressing in a mold with a diameter of 12mm under a pressure of 200Mpa to make a green body. Under the condition of 500°C for 1 hour, the viscous body was debonded, and the sample after debonding was put into a discharge plasma device for sintering. The sintering temperature was 1100°C and the heat preservation was 30 minutes.

[0016] The electromechanical performance is: d 33 =270PC / N,k P =0.52, Qm=460, ε 33 T / ε 0 =830, tanδ=0.003.

[0017] The ceramic particle size is 0.7-0.9 μm.

Embodiment 2

[0019] The compounding ratio (mole percentage) of the five raw material components is: 47% of potassium niobate, 47% of sodium niobate, 1.5% of sodium carbonate, 1.5% of bismuth trioxide, and 6% of titanium dioxide. Ball milling and mixing, adding 5% polyvinyl alcohol (PVA) to granulate, and dry pressing in a mold with a diameter of 12mm under a pressure of 200Mpa to make a green body. Under the condition of 500°C for 1 hour, the green body was debonded, and the sample after debonding was put into a discharge plasma device for sintering. The sintering temperature was 1150°C, and the heat preservation was 10 minutes.

[0020] The electromechanical performance is: d 33 =240PC / N,k P =0.50, Qm=580, ε 33 T / ε 0 =678, tanδ=0.005.

[0021] The ceramic particle size is 0.7-0.9 μm.

Embodiment 3

[0023] The compounding ratio (mole percentage) of the five raw materials is: 48% of potassium niobate, 48% of sodium niobate, 1% of sodium carbonate, 1% of bismuth trioxide, and 4% of titanium dioxide. Ball milling and mixing, adding 5% polyvinyl alcohol (PVA) to granulate, and dry pressing in a mold with a diameter of 12mm under a pressure of 200Mpa to make a green body. Under the condition of 500°C for 1 hour, the viscous body was debonded, and the sample after debonding was put into a discharge plasma device for sintering. The sintering temperature was 1150°C and the heat preservation was 20 minutes.

[0024] The electromechanical performance is: d 33 =263PC / N,k P =0.51, Qm=526, ε 33 T / ε 0 = 718, tan δ = 0.004.

[0025] The ceramic particle size is 0.7-0.9 μm.

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Abstract

The invention provides a production method of potassium sodium niobate / sodium bismuth titanate composite-phase piezoelectric ceramic. The ceramic is produced from the raw materials of, by molar percentages: 47-48% of potassium niobate, 47-48% of sodium niobate, 1-1.5% of sodium carbonate, 1-1.5% of bismuth trioxide, and 4-6% of titanium dioxide. The materials are mixed by call milling; 5% of polyvinyl alcohol (PVA) is added for granulation; dry-pressing molding is carried out in a mold with a diameter of 12mm under a pressure intensity of 20MPa, such that a blank is prepared; the blank is subjected to viscosity-eliminating under a temperature maintained at 500 DEG C for 1h; the obtained sample is sintered in a discharge plasma device, wherein a sintering temperature is 1100-1150 DEG C, and the temperature is maintained for 15-30min; the sintered sample is grinded and polished, such that a wafer with a diameter of 10-11mm and a thickness of 0.5mm is obtained; the wafer is coated by using silver; and the wafer is polarized for 30min in silicon oil with a temperature of 120 DEG C and with applied voltage of 3-4KV / mm. With the method, the prepared potassium sodium niobate / sodium bismuth titanate composite-phase piezoelectric ceramic has excellent piezoelectric property and no lead pollution.

Description

technical field [0001] The invention relates to the field of functional ceramics, in particular to a discharge plasma production method of potassium sodium niobate / bismuth sodium titanate composite phase lead-free piezoelectric ceramics. Background technique [0002] Since the discovery of lead zirconate titanate Pb(Ti,Zr)O in the 1950s 3 Since (PZT) piezoelectric ceramics, the main component of practical piezoelectric ceramics is PbO, and the lead content is as high as 60%. Lead pollution has become one of human public hazards. With the enhancement of people's environmental awareness and the needs of sustainable social development, Research on new environment-friendly piezoelectric ceramics has become an inevitable trend. The currently researched lead-free piezoelectric ceramics mainly include: bismuth layered structure lead-free piezoelectric ceramics, barium titanate BaTiO 3 (BT)-based lead-free piezoelectric ceramics, sodium bismuth titanate (Bi, Na)TiO 3 (BNT)-based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 张逸轩张建平
Owner SHANGHAI LONGTIAN NEW MATERIAL TECH CO LTD
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