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Lead-free piezoelectric ceramic and preparation method thereof

A lead-free piezoelectric and ceramic technology, applied in the field of electrochemistry, can solve the problems of poor piezoelectric ceramic performance, complex production process, and difficult sintering, and achieve the effect of improving polarizability, good performance, and simple method

Inactive Publication Date: 2016-10-26
BEIJING ZHONGKE AOBEI ULTRASONIC TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a lead-free piezoelectric ceramic and its preparation method, which can effectively solve the complex production process, difficult sintering, poor performance of piezoelectric ceramics, and can not reach the actual Application Requirement Questions

Method used

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  • Lead-free piezoelectric ceramic and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In concrete implementation, the present invention is realized by the following steps:

[0027] (1) Ingredients: BaCO in molar ratio 3 : ZrO 2 : TiO 2 =1:0.055:0.945 mixed together to make powder;

[0028] (2) Put the powder prepared in step (1) into a ball mill tank, use absolute ethanol as the medium, and use a planetary ball mill to mill for 24 hours to form a slurry;

[0029] (3) Dry the slurry prepared in step (2) in a drying oven at 105°C, press it into a Ф60 disc, put it into a corundum crucible, and then put it into a muffle furnace for pre-firing. The pre-firing temperature is 1200°C. The burning time is 2h, and the reaction synthesizes BaZr 0.055 Ti 0.945 o 3 ;

[0030] (4) With Bi 2 o 3 、Na 2 CO 3 、TiO 2 , MnO 2 and BaZr 0.055 Ti 0.945 o 3 Powder is the raw material, according to the chemical formula 0.93BNT-0.07BZT+0.125%MnO 2 , according to Bi 2 o 3 : Na 2 CO 3 : TiO 2 : BaZr 0.055 Ti 0.945 o 3 The molar ratio is 0.465:0.465:0.93:0.0...

Embodiment 2

[0042] In concrete implementation, the present invention is realized by the following steps:

[0043] (1) Ingredients: BaCO in molar ratio 3 : ZrO 2 : TiO 2 =1:0.055:0.945 mixed together to make powder;

[0044] (2) Put the powder prepared in step (1) into a ball mill tank, use absolute ethanol as the medium, and use a planetary ball mill to mill for 36 hours to form a slurry;

[0045] (3) Dry the slurry prepared in step (2) in a drying oven at 105°C, press it into a Ф60 disc, put it into a corundum crucible, and then put it into a muffle furnace for pre-firing. The pre-firing temperature is 1200°C. The burning time is 2h, and the reaction synthesizes BaZr 0.055 Ti 0.945 o 3 ;

[0046] (4) With Bi 2 o 3 、Na 2 CO 3 、TiO 2 , MnO 2 and BaZr 0.055 Ti 0.945 o 3 Powder is the raw material, according to the chemical formula 0.93BNT-0.07BZT+0.125%MnO 2 , according to Bi 2 o 3 : Na 2 CO 3 : TiO 2 : BaZr 0.055 Ti 0.945 o 3 The molar ratio is 0.465:0.465:0.93:0.0...

Embodiment 3

[0058] In concrete implementation, the present invention is realized by the following steps:

[0059] (1) Ingredients: BaCO in molar ratio 3 : ZrO 2 : TiO 2 =1:0.055:0.945 mixed together to make powder;

[0060] (2) Put the powder prepared in step (1) into a ball mill tank, use absolute ethanol as the medium, and use a planetary ball mill to mill for 36 hours to form a slurry;

[0061] (3) Dry the slurry prepared in step (2) in a drying oven at 105°C, press it into a Ф60 disc, put it into a corundum crucible, and then put it into a muffle furnace for pre-firing. The pre-firing temperature is 1200°C. The burning time is 2h, and the reaction synthesizes BaZr 0.055 Ti 0.945 o 3 ;

[0062] (4) With Bi 2 o 3 、Na 2 CO 3 、TiO 2 , MnO 2 and BaZr 0.055 Ti 0.945 o 3 Powder is the raw material, according to the chemical formula 0.93BNT-0.07BZT+0.375%MnO 2 , according to Bi 2 o 3 : Na 2 CO 3 : TiO 2 : BaZr 0.055 Ti 0.945 o 3 The molar ratio is 0.465:0.465:0.93:0.0...

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Abstract

The invention relates to lead-free piezoelectric ceramic and a preparation method thereof. The problems that the production technology is complex, sintering is difficult, piezoelectric ceramic is poor in performance and requirements in actual application are not met are solved. The method includes the steps that BaCO3 powder, ZrO2 powder and TiO2 powder are contained in a ball milling tank, ethyl alcohol is added to be ground, dried, tabletted and pre-sintered to synthesize BaZr0.055Ti0.945O3; ethyl alcohol is added to Bi2O3, Na2CO3, TiO2, MnO2 and BaZr0.055Ti0.945O3 to be ball-milled and dried, an adhesive is added, compaction and plastic removal are conducted, the mixture is buried with powder to be sintered, silver paste coating and forging are conducted, and a silver electrode is formed on the surface; then the product is placed in silicon oil, the electric field is polarized, and the lead-free piezoelectric ceramic material is obtained. The Mn-codoped Bi0.5Na0.5TiO3-BaZr0.055Ti0.945O3 lead-free piezoelectric ceramic is designed and synthesized for the first time, the coercive field and leakage current of piezoelectric ceramic are effectively reduced, polarizability is improved, performance is good, the method is simple, and production and preparation are easy.

Description

technical field [0001] The invention relates to electrochemistry, in particular to a lead-free piezoelectric ceramic and a preparation method thereof. Background technique [0002] Piezoelectric ceramics can achieve mutual conversion between mechanical energy and electrical energy. Electromechanical devices made of piezoelectric ceramics have been widely used in military, national defense, medical and various fields of human production and life. PZT-based piezoelectric ceramics are the most widely used ceramic materials due to their excellent electrical properties since their discovery. However, lead-based piezoelectric ceramics contain more than 60% lead, which is a toxic substance that will cause harm to humans and the environment during the preparation, use, and disposal of ceramics. With the enhancement of people's awareness of environmental protection, countries have begun to promulgate laws and regulations to prohibit the use of lead-containing materials in electronic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
CPCC04B35/475C04B35/622C04B2235/3201C04B2235/3215C04B2235/3249C04B2235/3267C04B2235/72
Inventor 刘洁王竹郭菲菲李欣宇冯莎莎董彦峰
Owner BEIJING ZHONGKE AOBEI ULTRASONIC TECH RES INST
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