Large-strain low-drive electric field relaxation and ferroelectric composite lead-free piezoelectric ceramic and preparation method thereof

A technology of electric lead-free ceramics and lead-free piezoelectric, which is applied in the field of composite piezoelectric ceramics, can solve the problems of poor piezoelectric performance, difficult application, excessive driving electric field, etc., and achieve the effect of reducing cost and difficulty of production process

Inactive Publication Date: 2015-12-30
张海波
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Problems solved by technology

In addition, the lead-free piezoelectric ceramics currently being developed have shortcomings such as small piezoelectric strain and poor piezoelectric performance. The BNT-BT-KNN relaxation type lead-free piezoelectric ceramics has a larger electrical strain than soft PZT. It has great potential application value in piezoelectric actuators, but the required driving electric field is too large to be practically applied

Method used

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  • Large-strain low-drive electric field relaxation and ferroelectric composite lead-free piezoelectric ceramic and preparation method thereof
  • Large-strain low-drive electric field relaxation and ferroelectric composite lead-free piezoelectric ceramic and preparation method thereof
  • Large-strain low-drive electric field relaxation and ferroelectric composite lead-free piezoelectric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] According to the general formula (1-x 1 -y 1 )Bi 0.5 Na 0.5 TiO 3 -x 1 Bi 0.5 K 0.5 TiO 3 -y 1 AgNbO 3 The indicated content of sodium bismuth titanate-potassium bismuth titanate-silver niobate ternary relaxation type lead-free piezoelectric ceramics is prepared, and the relaxation type ceramic powder A is prepared by the traditional solid-phase method. According to the general formula (1- z) Bi 0.5 Na 0.5 TiO 3 -zBaTiO 3 The sodium bismuth titanate-barium titanate ferroelectric ceramic powder B was prepared by the traditional solid-phase method; when x1=0.18, y1=0.02, z=0.06, A is 0.80Bi 0.5 Na 0.5 TiO 3 -0.18Bi 0.5 K 0.5 TiO 3 -0.02AgNbO 3 , B is 0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 , Mix 20% volume B powder into 80% volume A powder, mix by ball milling, dry, granulate and dry press into flakes, and then sinter at 1120°C for 1 hour in an air atmosphere, the obtained The relaxo-ferroelectric composite ceramics, the surface was polished and the u...

Embodiment 2

[0041] According to the general formula (1-x 1 -y 1 )Bi 0.5 Na 0.5 TiO 3 -x 1 Bi 0.5 K 0.5 TiO 3 -y 1 AgNbO 3 The indicated content of sodium bismuth titanate-potassium bismuth titanate-silver niobate ternary relaxation type lead-free piezoelectric ceramics is prepared, and the relaxation type ceramic powder A is prepared by the traditional solid-phase method. According to the general formula (1- z) Bi 0.5 Na 0.5 TiO 3 -zBaTiO 3 The sodium bismuth titanate-barium titanate ferroelectric ceramic powder B was prepared by the traditional solid-phase method; when x1=0.20, y1=0.03, z=0.06, A is 0.77Bi 0.5 Na 0.5 TiO 3 -0.20Bi 0.5 K 0.5 TiO 3 -0.03AgNbO 3 , B is 0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 , Mix 30% volume B powder into 80% volume A powder, mix by ball milling, dry, granulate and dry press into flakes, and then sinter at 1130 °C for 1 hour in an air atmosphere, the obtained The relaxo-ferroelectric composite ceramics, the surface was polished and the ...

Embodiment 3

[0043] According to the general formula (1-x 1 -y 1 )Bi 0.5 Na 0.5 TiO 3 -x 1 Bi 0.5 K 0.5 TiO 3 -y 1 AgNbO 3 The indicated content of sodium bismuth titanate-potassium bismuth titanate-silver niobate ternary relaxation type lead-free piezoelectric ceramics is prepared, and the relaxation type ceramic powder A is prepared by the traditional solid-phase method. According to the general formula (1- z) Bi 0.5 Na 0.5 TiO 3 -zBaTiO 3 The sodium bismuth titanate-barium titanate ferroelectric ceramic powder B was prepared by the traditional solid-phase method; when x1=0.21, y1=0.03, z=0.07, A is 0.76Bi 0.5 Na 0.5 TiO 3 -0.21Bi 0.5 K 0.5 TiO 3 -0.03AgNbO 3 , B is 0.93Bi 0.5 Na 0.5 TiO 3 -0.07BaTiO 3 , 30% volume B powder is mixed into 70% volume A powder, after ball milling mixing, drying, granulation and dry pressing into flakes, after sintering at 1140 ° C for 1 hour in an air atmosphere, the obtained The relaxo-ferroelectric composite ceramics, whose surface...

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Abstract

The invention discloses large-strain low-drive electric field relaxation and ferroelectric composite lead-free piezoelectric ceramic and a preparation method thereof. The method includes: acquiring a component A, (1-x1-y1)Bi0.5Na0.5TiO3-x1Bi0.5K0.5TiO3-y1AgNbO3, wherein 0.16< / =x1< / =0.22, 0.01< / =y1< / =0.03; or (1-x2-y2)Bi0.5Na0.5TiO3-x2BaTiO3-y2AgNbO3, wherein 5< / =x2< / =0.07, 0.01< / =y2< / =0.03; and a component B, (1-z)Bi0.5Na0.5TiO3-zBaTiO3, wherein 0.05< / =z< / =0.07; or (1-w)Bi0.5Na0.5TiO3-wBi0.5K0.5TiO3, wherein 0.16< / =w< / =0.22; after drying, heating, pre-sintering, ball-milling and drying, pre-sintering each component for 3 hours; after grinding, mixing ferroelectric lead-free ceramic B and relaxation lead-free piezoelectric ceramic B, performing ball-milling for 4 hours, and performing PVA granulating, dry-pressing forming, sintering and polishing to obtain the composite lead-free piezoelectric ceramic. The performance is improved, production technical difficulty is lowered, and cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of composite piezoelectric ceramics, and relates to a relaxation-ferroelectric composite lead-free piezoelectric ceramic with large strain and low driving electric field and a preparation method thereof. Background technique [0002] In order to replace lead-based piezoelectric materials in traditional multilayer piezoelectric actuators, German scholars have published a paper "Giantstraininlead-freepiezoceramicsBi 0.5 Na 0.5 TiO 3 -BaTiO 3 -K 0.5 Na 0.5 NbO 3 system" (AppliedPhysicsLetters, Vol. 91, No. 11, 2007) reported a lead-free piezoelectric ceramic material with super large strain. Its electrical strain can reach 0.45%, but the driving electric field is as high as 8kV / mm. Large distance. Korean scholars in "Electricfield-induced deformationbehaviorinmixedBi 0.5 Na 0.5 TiO 3 andBi 0.5 (Na 0.75 K 0.25 ) 0.5 TiO 3 -BiAlO 3 "(AppliedPhysicsLetters, Vol. 99, No. 6, 2011) reported a ferroelec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
Inventor 张海波
Owner 张海波
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