CN104446447A

CN104446447A - Large-strain lead-free piezoelectric ceramic complex and preparation method thereof

Info

Publication number: CN104446447A
Application number: CN201410624547.9A
Authority: CN
Inventors: 刘来君; 刘赛赛; 邓建明
Original assignee: Guilin University of Technology
Current assignee: The European Taixin photoelectric technology (Suzhou) Co., Ltd.
Priority date: 2014-11-09
Filing date: 2014-11-09
Publication date: 2015-03-25
Anticipated expiration: 2034-11-09
Also published as: CN104446447B

Abstract

The invention discloses a large-strain lead-free piezoelectric ceramic complex and a preparation method thereof. According to the large-strain lead-free piezoelectric ceramic complex and the preparation method thereof disclosed by the invention, a multi-layer overlapping complex of two compounds is prepared by adopting an electronic ceramic process, except solid solutions are respectively formed on interfaces of the two compounds, the respective components at other parts of the two compounds can not be changed, and respective Curie temperatures and electrostrictive strains are both kept; moreover, as the solid solutions are formed on the interfaces to generate a buffer belt or a mutual restraining region, the advantages of the two components are exerted, and the amount of electrostrictive strain electric field is reduced; compared with a mode of simply adhering two ceramics, the connecting mode is firm and is capable of exerting the respective advantages of the two ceramics.

Description

A kind of large sstrain leadless piezoelectric ceramics mixture and preparation method thereof

Technical field

The present invention relates to a kind of large sstrain leadless piezoelectric ceramics mixture and preparation method thereof, belong to field of electronic materials.

Background technology

Along with the pay attention to day by day of environment protection, lead base piezoelectric ceramics requires to use lead-free to replace gradually.In leadless piezoelectric ceramics, potassium-sodium niobate base, barium phthalate base and bismuth-sodium titanate base piezoelectric ceramic show excellent piezoelectric property.Wherein potassium-sodium niobate base pottery has higher Curie temperature and larger piezoelectric constant; Barium titanate based ceramic has larger specific inductivity and larger piezoelectric constant; Bismuth sodium titanate based pottery has higher electric field induced strain and moderate Curie temperature.

In order to obtain the good leadless piezoelectric material material of comprehensive comparison, often employing two kinds or two or more compounds obtain respective advantage by compound.Such as 0.94Bi _0.5na _0.5tiO ₃-0.96BaTiO ₃show high electric field induced strain and higher Curie temperature [W. Jo, T. Granzow, E. Aulbach, J. R del, and D. Damjanovic, Origin of the large strain response in (K _0.5na _0.5) NbO ₃-modified (Bi _0.5na _0.5) TiO ₃– BaTiO ₃lead-free piezoceramics, J. Appl. Phys. 105,094102 (2009) .].But have two deficiencies by the piezoelectric ceramics that the method for solid solution obtains, one is that to obtain the driving voltage of large electric field induced strain very high, another be Curie temperature reduce more severe.Be expected to improve or avoid above-mentioned defect by the method for two kinds or two or more Material cladding instead of solid solution.Because two kinds or two or more material play the advantage of oneself separately and mutually pin down in interface, thus good comprehensive electrical performance can be obtained.

Summary of the invention

The object of this invention is to provide a kind of large sstrain leadless piezoelectric ceramics mixture and preparation method thereof.

Large sstrain leadless piezoelectric ceramics mixture of the present invention is prepared from by traditional electronic ceramics sintering technology by leadless piezoelectric compd A and leadless piezoelectric compd B, and wherein compd A is BaTiO ₃, (Bi _0.5na _0.5) TiO ₃, 0.94 (Bi _0.5na _0.5) TiO ₃0.06BaTiO ₃, (K _0.5na _0.5) NbO ₃, (Sr _0.35na _0.25bi _0.35) TiO ₃with 0.91 (Bi _0.5na _0.5) TiO ₃0.06BaTiO ₃0.03 (K _0.5na _0.5) NbO ₃in one, compd B is 0.75 (Bi _0.5na _0.5) TiO ₃0.25SrTiO ₃, 0.85 (Bi _0.5na _0.5) TiO ₃0.15SrZrO ₃, 0.96 (Bi _0.5na _0.5) TiO ₃0.04 (K _0.5na _0.5) NbO ₃with 0.792 (Bi _0.5na _0.5) TiO ₃-0.1983 (Bi _0.5k _0.5) TiO ₃-0.0097 (K _0.5na _0.5) NbO ₃in one.

Preparing above-mentioned large sstrain leadless piezoelectric ceramics mixture concrete steps is:

(1) traditional process for solid phase synthesis is adopted to prepare the powder of compd A and compd B respectively and granulation is for subsequent use.

(2) be the compd A and compd B that 1:0.2 ~ 5 take prepared by step (1) according to mass ratio, first in mould, add compd A, compd B is added after jolt ramming, repeat this operation and superpose compd A and compd B alternately, until compd A and the overlapping number of plies of compd B are 1 ~ 6 layer, then become biscuit at 350MPa pressure.

(3) biscuit obtained for step (2) is namely obtained large sstrain leadless piezoelectric ceramics mixture by traditional electronic ceramics sintering technology.

Described compd A and compd B are leadless piezoelectric compound, and wherein compd A is BaTiO ₃, (Bi _0.5na _0.5) TiO ₃, 0.94 (Bi _0.5na _0.5) TiO ₃0.06BaTiO ₃, (K _0.5na _0.5) NbO ₃, (Sr _0.35na _0.25bi _0.35) TiO ₃with 0.91 (Bi _0.5na _0.5) TiO ₃0.06BaTiO ₃0.03 (K _0.5na _0.5) NbO ₃in one, compd B is 0.75 (Bi _0.5na _0.5) TiO ₃0.25SrTiO ₃, 0.85 (Bi _0.5na _0.5) TiO ₃0.15SrZrO ₃, 0.96 (Bi _0.5na _0.5) TiO ₃0.04 (K _0.5na _0.5) NbO ₃with 0.792 (Bi _0.5na _0.5) TiO ₃-0.1983 (Bi _0.5k _0.5) TiO ₃-0.0097 (K _0.5na _0.5) NbO ₃in one.

Large sstrain leadless piezoelectric ceramics mixture of the present invention and solid solution phase ratio, except the interface of two kinds of compounds defines sosoloid, elsewhere all can not change respective composition, and its Curie temperature and electric field induced strain are all retained; Moreover, define sosoloid in interface, cause a buffer strip or mutually pin down region occurring, thus played the advantage of two kinds of compositions, reduce the electric field of electric field induced strain.This mode of connection is firmer than simple two kinds of ceramic bondings, more can play respective advantage.Meanwhile, preparation method's step of the present invention is simple, easy to operate.

Accompanying drawing explanation

Fig. 1 is the room temperature electric field induced strain figure of the large sstrain leadless piezoelectric ceramics mixture that the embodiment of the present invention 1 obtains, and in figure, ordinate zou is electric field induced strain S, and X-coordinate is electric field strength E, and the insertion portion in figure is the schematic diagram of compd A and compd B compound.

Fig. 2 is the room temperature electric field induced strain figure of the large sstrain leadless piezoelectric ceramics mixture that the embodiment of the present invention 2 obtains, and in figure, ordinate zou is electric field induced strain S, and X-coordinate is electric field strength E, and the insertion portion in figure is the schematic diagram of compd A and compd B compound.

Embodiment

embodiment 1:

(1) traditional process for solid phase synthesis is adopted to prepare the powder of compd A and compd B respectively and adopt mechanical pelleting for subsequent use.

(2) be the compd A and compd B that 1:1 takes prepared by step (1) according to mass ratio, first in mould, add compd A, add compd B after jolt ramming, then become biscuit at 350MPa pressure.

(3) biscuit obtained for step (2) is then incubated 2 hours through binder removal operation at 1100 DEG C and namely obtains large sstrain leadless piezoelectric ceramics mixture.

Described compd A and compd B are leadless piezoelectric compound, and wherein compd A is 0.91 (Bi _0.5na _0.5) TiO ₃0.06BaTiO ₃0.03 (K _0.5na _0.5) NbO ₃, compd B is 0.792 (Bi _0.5na _0.5) TiO ₃-0.1983 (Bi _0.5k _0.5) TiO ₃-0.0097 (K _0.5na _0.5) NbO ₃.

The obtained large sstrain leadless piezoelectric ceramics mixture of the present embodiment through surface finish and by silver-colored operation after carry out electric field induced strain test, Fig. 1 gives the graph of a relation of electric field and strain.

embodiment 2:

(2) be the compd A and compd B that 1:4 takes prepared by step (1) according to mass ratio, first in mould, add compd A, compd B is added after jolt ramming, repeat this operation and superpose compd A and compd B alternately, until compd A and the overlapping number of plies of compd B are 4 layers, namely 4 layers of compd A and 4 layers of compd B overlapping, then become biscuit at 350MPa pressure.

Described compd A and compd B are leadless piezoelectric compound, and wherein compd A is 0.94 (Bi _0.5na _0.5) TiO ₃0.06BaTiO ₃, compd B is 0.75 (Bi _0.5na _0.5) TiO ₃0.25SrTiO ₃.

The obtained large sstrain leadless piezoelectric ceramics mixture of the present embodiment through surface finish and by silver-colored operation after carry out electric field induced strain test, Fig. 2 gives the graph of a relation of electric field and strain.

Claims

1. a large sstrain leadless piezoelectric ceramics mixture, it is characterized in that this large sstrain leadless piezoelectric ceramics mixture is prepared from by traditional electronic ceramics sintering technology by leadless piezoelectric compd A and leadless piezoelectric compd B, wherein compd A is BaTiO ₃, (Bi _0.5na _0.5) TiO ₃, 0.94 (Bi _0.5na _0.5) TiO ₃0.06BaTiO ₃, (K _0.5na _0.5) NbO ₃, (Sr _0.35na _0.25bi _0.35) TiO ₃with 0.91 (Bi _0.5na _0.5) TiO ₃0.06BaTiO ₃0.03 (K _0.5na _0.5) NbO ₃in one, compd B is 0.75 (Bi _0.5na _0.5) TiO ₃0.25SrTiO ₃, 0.85 (Bi _0.5na _0.5) TiO ₃0.15SrZrO ₃, 0.96 (Bi _0.5na _0.5) TiO ₃0.04 (K _0.5na _0.5) NbO ₃with 0.792 (Bi _0.5na _0.5) TiO ₃-0.1983 (Bi _0.5k _0.5) TiO ₃-0.0097 (K _0.5na _0.5) NbO ₃in one.

2. the preparation method of large sstrain leadless piezoelectric ceramics mixture according to claim 1, is characterized in that concrete steps are:

(1) traditional process for solid phase synthesis is adopted to prepare the powder of compd A and compd B respectively and granulation is for subsequent use;

(2) be the compd A and compd B that 1:0.2 ~ 5 take prepared by step (1) according to mass ratio, first in mould, add compd A, compd B is added after jolt ramming, repeat this operation and superpose compd A and compd B alternately, until compd A and the overlapping number of plies of compd B are 1 ~ 6 layer, then become biscuit at 350MPa pressure;

(3) biscuit obtained for step (2) is namely obtained large sstrain leadless piezoelectric ceramics mixture by traditional electronic ceramics sintering technology;