Sodium bismuth titanate based lead-free piezoelectric ceramic with high piezoelectric coefficient and method for preparing sodium bismuth titanate based lead-free piezoelectric ceramic

A technology based on lead-free piezoelectric and sodium bismuth titanate, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc. Coefficient and other issues, to achieve the effect of good piezoelectric performance, low production cost and good application

Active Publication Date: 2018-06-12
广州光鼎科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in general, the piezoelectric properties of bismuth sodium titanate-based lead-free piezoelectric ceramics still need to be further improved to obtain high piezoelectric coefficients.
At present, there are few reports on the Rb equivalent doping of sodium bismuth titanate system

Method used

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  • Sodium bismuth titanate based lead-free piezoelectric ceramic with high piezoelectric coefficient and method for preparing sodium bismuth titanate based lead-free piezoelectric ceramic
  • Sodium bismuth titanate based lead-free piezoelectric ceramic with high piezoelectric coefficient and method for preparing sodium bismuth titanate based lead-free piezoelectric ceramic
  • Sodium bismuth titanate based lead-free piezoelectric ceramic with high piezoelectric coefficient and method for preparing sodium bismuth titanate based lead-free piezoelectric ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Preparation of BNT-BKT-BT lead-free piezoelectric ceramics.

[0036] According to 0.85Bi 0.5 Na 0.5 TiO 3 -0.11Bi 0.5 K 0.5 TiO 3 -0.04BaTiO 3 The molar stoichiometric ratio of the raw material Bi was weighed 2 o 3 , Na 2 CO 3 , K 2 CO 3 , BaCO 3 and TiO 2 Mix evenly, put the prepared material into a nylon jar with absolute ethanol as the medium and zirconia balls as the balls for ball milling, and ball mill for 12 hours at a speed of 400r / min. Then the ball-milled slurry was dried at 80°C. The dried powder was passed through a 200-mesh sieve, placed in an alumina crucible, and pre-fired at 800°C for 3 hours to obtain a pre-fired powder. Then the calcined powder was ball milled at 400r / min for 24h, and then dried at 80°C. After sieving the above powder, add 1% of the total mass of calcined powder, add polyvinyl butyral (PVA), fully grind until the powder is granular, and obtain a powder with uniform particles, and hold the pressure for 5 minut...

Embodiment 2

[0037] Embodiment 2: Preparation of BNT-BKT-BT-Rb 0.05 Lead-free piezoelectric ceramics.

[0038]According to 0.85Bi 0.5 Na 0.5 TiO 3 -0.11Bi 0.5 K 0.45 Rb 0.05 TiO 3 -0.04BaTiO 3 The stoichiometric ratio of the raw material Bi is weighed 2 o 3 , Na 2 CO 3 ,K 2 CO 3 , BaCO 3 ,Rb 2 CO 3 and TiO 2 powder, put the prepared material into a nylon jar with absolute ethanol as the medium and zirconia balls as the balls for ball milling, and ball mill for 12 hours at a speed of 400r / min. Then the ball-milled slurry was dried at 75°C. The dried powder was passed through a 200-mesh sieve, placed in an alumina crucible, and pre-fired at 850°C for 3 hours to obtain a pre-fired powder. Then the calcined powder was ball milled at 400r / min for 24h, and then dried at 80°C. After sieving the above powder, add 0.8% of the total mass of calcined powder, add polyvinyl butyral (PVA), fully grind until the powder is granular, and obtain a powder with uniform particles, and hold ...

Embodiment 3

[0039] Embodiment 3: Preparation of BNT-BKT-BT-Rb 0.10 Lead-free piezoelectric ceramics.

[0040] According to 0.85Bi 0.5 Na 0.5 TiO 3 -0.11Bi 0.5 K 0.40 Rb 0.10 TiO 3 -0.04BaTiO 3 The stoichiometric ratio of the raw material Bi is weighed 2 o 3 , Na 2 CO 3 ,K 2 CO 3 , BaCO 3 ,Rb 2 CO 3 and TiO 2 powder, put the prepared material into a nylon jar with absolute ethanol as the medium and zirconia balls as the balls for ball milling, and ball mill for 12 hours at a speed of 400r / min. Then the ball-milled slurry was dried at 85°C. The dried powder was passed through a 200-mesh sieve, placed in an alumina crucible, and pre-fired at 850°C for 3 hours to obtain a pre-fired powder. Then the calcined powder was ball milled at 400r / min for 24h, and then dried at 85°C. After sieving the above powder, add 1% of the total mass of calcined powder, add polyvinyl butyral (PVA), fully grind until the powder is granular, and obtain a powder with uniform particles, and hold t...

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Abstract

The invention discloses sodium bismuth titanate based lead-free piezoelectric ceramic with a high piezoelectric coefficient and a method for preparing the sodium bismuth titanate based lead-free piezoelectric ceramic. A stoichiometric ratio of the sodium bismuth titanate based lead-free piezoelectric ceramic (BNT-BKT-BT-Rb<x>, wherein the x can be equal to 0, 0.05, 0.10 and 0.20) with the high piezoelectric coefficient is shown as 0.85Bi<0.5>Na<0.5>TiO<3>-0.11 Bi<0.5>K<0.5-x>Rb<x>TiO<3>-0.04BaTiO<3>. The method includes uniformly mixing Bi<2>O<3> powder, Na<2>CO<3> powder, K<2>CO<3> powder, BaCO<3> powder, Rb<2>CO<3> powder and TiO<2> powder with one another according to the stoichiometric ratio; carrying out ball-milling and drying and carrying out pre-burning at the temperature of 850 DEG C for 3 h to obtain pre-burned powder; carrying out secondary ball-milling, drying, granulating, compressing and glue discharging and then carrying out sintering at the temperature of 1160-1180 DEGC; carrying out silver firing and polarization to obtain the sodium bismuth titanate based lead-free piezoelectric ceramic. The sodium bismuth titanate based lead-free piezoelectric ceramic and the method have the advantages that rubidium elements are doped in the sodium bismuth titanate based lead-free piezoelectric ceramic, and accordingly the piezoelectric coefficient d33 of the sodium bismuthtitanate based lead-free piezoelectric ceramic can be increased; the piezoelectric coefficient of BNT-BKT-BT-Rb<0.05> ceramic can reach 210 pC / N, and the sodium bismuth titanate based lead-free piezoelectric ceramic which is a lead-free piezoelectric material can be effectively applied to diversified fields of actuators, sensors and the like.

Description

technical field [0001] The invention relates to a high-voltage electric coefficient bismuth sodium titanate-based lead-free piezoelectric ceramic and a preparation method thereof, belonging to the technical field of lead-free piezoelectric ceramic materials. Background technique [0002] Piezoelectric ceramics are a kind of functional ceramics, which can realize mutual conversion of electrical energy and mechanical energy, and have irreplaceable application value in the fields of electronics, machinery and communication, and are widely used in drivers, sensors, transducers and other devices. make. However, the piezoelectric ceramics currently used on a large scale are still lead-based piezoelectric ceramics such as PZT, but lead is toxic, which will endanger human health and pollute the environment. The governments of major industrial countries and our country have promulgated corresponding laws and regulations to restrict or completely ban the use of lead and other harmful...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622C04B35/626C04B35/634C04B35/638C04B41/88H01L41/43H01L41/187
CPCC04B35/475C04B35/622C04B35/62605C04B35/62645C04B35/62695C04B35/6342C04B35/638C04B41/5116C04B41/88C04B2235/661C04B2235/6567C04B2235/6562C04B2235/3215C04B2235/3201H10N30/8561H10N30/097C04B41/4539C04B41/0072
Inventor 张斗周学凡姜超罗行周科朝
Owner 广州光鼎科技集团有限公司
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