Bismuth ferrate-barium titanate-bismuth zinc titanate-bismuth aluminate high-temperature lead-free piezoelectric ceramic and preparation method thereof

A bismuth zinc titanate and lead-free piezoelectric technology, which is applied in the field of bismuth ferrite-barium titanate-bismuth zinc titanate-bismuth aluminate high-temperature lead-free piezoelectric ceramics and its preparation, can solve the problems of miscellaneous items, synthesis Difficulties and other problems, to achieve the effect of high Curie temperature and high temperature stability

Active Publication Date: 2019-08-16
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Bi(Ti 0.5 Zn 0.5 )O 3 The synthesis of is relatively difficult, and it is easy to produce miscellaneous items, which need to be synthesized under high temperature and high pressure conditions
BiAlO 3 It is a trigonal phase perovskite structure compound, the Curie temperature exceeds 550 °C, there is no phase transition from room temperature to 550 °C, and it has very high temperature stability, but BiAlO 3 The synthesis of is also very difficult and needs to be synthesized under high temperature and pressure

Method used

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  • Bismuth ferrate-barium titanate-bismuth zinc titanate-bismuth aluminate high-temperature lead-free piezoelectric ceramic and preparation method thereof
  • Bismuth ferrate-barium titanate-bismuth zinc titanate-bismuth aluminate high-temperature lead-free piezoelectric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Composition: 0.70BiFeO 3 -0.20BaTiO 3 -0.05Bi(Ti 0.5 Zn 0.5 )O 3 -0.05BiAlO 3 +0.01Li 2 CO 3 +0.01MnCO 3 +0.025Bi 2 o 3 , the preparation method comprises the following steps:

[0022] (1) To analyze pure TiO 2 、BaCO 3 As raw material, according to BaTiO 3 The mixed powder is ball milled with absolute ethanol as the medium for 24 hours, dried in an oven at 100°C / 12 hours, passed through a 200-mesh sieve, put into a high-alumina crucible for compaction and capped, and then put into a muffle Synthesize in a furnace at 980°C for 6 hours, cool down to below 200°C and take it out for use;

[0023] (2) BaTiO synthesized in step (1) 3 with analytically pure Bi 2 o 3 、TiO 2 , ZnO, Li 2 CO 3 As raw material, according to 1.0BaTiO 3 -0.5Bi(Ti 0.5 Zn 0.5 )O 3 +0.05Li 2 CO 3 The proportion of ingredients is mixed, the mixed powder is ball milled with absolute ethanol as the medium for 24 hours, taken out and dried in an oven at 100°C / 12 hours, passed throug...

Embodiment 2

[0035] Composition 0.725BiFeO 3 -0.175BaTiO 3 -0.075Bi(Ti 0.5 Zn 0.5 )O 3 -0.025BiAlO 3 +0.01Li 2 CO 3 +0.01MnCO 3 +0.025Bi 2 o 3 , the preparation method is the same as in Example 1, except that the formula ratio is changed, and the sintering temperature in step (7) is 960° C. for 120 minutes.

[0036] The performance measurements are as follows:

[0037] d 33 (pC / N)

Embodiment 3

[0039] Composition: 0.75BiFeO 3 -0.175BaTiO 3 -0.05Bi(Ti 0.5 Zn 0.5 )O 3 -0.025BiAlO 3 +0.006CuO+0.01MnCO 3 +0.025Bi 2 o 3 , the preparation method is the same as in Example 1, except that the formula is changed, CuO is used, and the sintering temperature in step (7) is 960° C. for 120 minutes.

[0040] The performance measurements are as follows:

[0041] d 33 (pC / N)

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Abstract

The invention discloses a bismuth ferrate-barium titanate-bismuth zinc titanate-bismuth aluminate high-temperature lead-free piezoelectric ceramic and a preparation method thereof. The composition general formula of the piezoelectric ceramic is: xBiFeO3-yBaTiO3-zBi(Ti0.5Zn0.5)O3+tBiAlO3+mP+nMnCO3+2.5%Bi2O3, wherein x, y, z, t, m and n represent mole fractions, 0.6<=x<=0.8, 0.15<=y<=0.3, 0.05<=z<=0.15, 0<t<=0.10, 0<m<=0.1, 0<n<=0.1, and 2.5% mol of Bi2O3 is used to make up the volatilization of the Bi element in the sintering process, and is used as a sintering aid; and P is one or a combination of several sintering aids of Ba(W0.5Cu0.5)O3, CuO and Li2CO3. The preparation method comprises the working procedures of batching according to the composition general formula, ball milling, molding,glue discharge, sintering and the like. The high-temperature lead-free piezoelectric ceramic is prepared, the Curie temperature T<c> is up to 596 DEG C, the depolarization temperature T<d> is up to 580 DEG C, and the highest piezoelectric constant is up to 137 pC / N. The system ceramics are expected to be applied in high temperature fields such as aerospace, nuclear power, petroleum exploration and the like.

Description

technical field [0001] The invention relates to a lead-free piezoelectric ceramic material applicable in the high-temperature field, in particular to a bismuth ferrite-barium titanate-bismuth zinc titanate-bismuth aluminate high-temperature lead-free piezoelectric ceramic and a preparation method thereof. Background technique [0002] High-temperature piezoelectric ceramics are widely used as vibration sensors in aerospace, nuclear energy, oil exploration and other fields. BiFeO 3 With a high Curie temperature (830°C) and a large remanent polarization, theoretical calculations show that BiFeO 3 has good piezoelectric properties, but BiFeO 3 It is difficult to synthesize alone, and it is easy to generate Bi-rich phase Bi during the synthesis process. 24 Fe 2 o 39 Compared with rich Fe 2 Fe 4 o 9 and other miscellaneous. By introducing BaTiO into the system 3 Instead of forming BiFeO 3 -BaTiO 3 solid solution, can effectively suppress the generation of miscellaneous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/63C04B41/88
CPCC04B35/2633C04B35/622C04B35/6303C04B41/009C04B41/5116C04B41/88C04B2235/3215C04B2235/3232C04B2235/3203C04B2235/3298C04B2235/3284C04B2235/3217C04B2235/3272C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567
Inventor 黄蔚然杨华斌刘笑张秀云孙媛媛陈巧红
Owner GUILIN UNIV OF ELECTRONIC TECH
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