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Multielement-doped bismuth titanate group lead-free piezoceramic material and preparation method thereof

A technology of lead-free piezoelectric and ceramic materials, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problems of limited development and achieve The effect of less piezoelectric performance and dielectric performance, less drop, and improved piezoelectric performance and dielectric performance

Inactive Publication Date: 2013-01-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the multi-element doping modification of bismuth titanate lead-free piezoelectric ceramics is currently limited, and there are very few reports at present.

Method used

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  • Multielement-doped bismuth titanate group lead-free piezoceramic material and preparation method thereof
  • Multielement-doped bismuth titanate group lead-free piezoceramic material and preparation method thereof
  • Multielement-doped bismuth titanate group lead-free piezoceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Composition Bi according to chemical formula 4 Ti 2.98 Nb 0.01 Ta 0.002 Sb 0.008 o 12 , calculate each raw material Bi 2 o 3 、TiO 2 , Nb 2 o 5 、 Ta 2 o 5 , Sb 2 o 3The ratio is weighed with an electro-optical analytical balance, ball milled in a ball mill for 36 hours, the mixture is put into an alumina crucible, and pre-fired in a muffle furnace with a maximum temperature of 800°C for 4 hours. After the powder is ground, first ball mill it in a ball mill for 72 hours, take out the powder, then dry it, weigh the piezoelectric ceramic powder and polyvinyl alcohol (7wt%, the mass fraction of polyvinyl alcohol is 18%), and use 50MPa pressure Pre-compression molding, then wrap the sample with a vacuum compressor, and use an isostatic pressing molding process to further compact the embryo body with a pressure of 200 MPa. Place the embryo body in a muffle furnace, and slowly raise the temperature from room temperature to 800°C to remove the binder polyvinyl alco...

Embodiment 2

[0027] Composition Bi according to chemical formula 4 Ti 2.98 Nb 0.01 Ta 0.004 Sb 0.006 o 12 , calculate each raw material Bi 2 o 3 、TiO 2 , Nb 2 o 5 、 Ta 2 o 5 , Sb 2 o 3 The ratio is weighed with an electro-optical analytical balance, ball milled in a ball mill for 5 hours, the mixture is put into an alumina crucible, and pre-fired in a muffle furnace. The pre-fired temperature is 700°C and the maximum temperature is 820°C. 3 hours, the powder after pre-burning is through grinding, ball mills in ball mill earlier 36 hours, takes out powder, then dries, takes piezoelectric ceramic powder and polyvinyl alcohol, piezoelectric ceramic powder is 10wt%, polyvinyl alcohol The mass fraction of vinyl alcohol is 12%, and the pressure of 100 MPa is used for pre-pressing, and then the sample is wrapped with a vacuum compressor, and the embryo body is further densified with a pressure of 200 MPa by isostatic pressing. Place the embryo body in a muffle furnace, and slowly ra...

Embodiment 3

[0030] Composition Bi according to chemical formula 4 Ti 2.98 Nb 0.01 Ta 0.006 Sb 0.004 o 12 , calculate each raw material Bi 2 o 3 、TiO 2 , Nb 2 o 5 、 Ta 2 o 5 , Sb 2 o 3 The ratio is weighed with an electro-optical analytical balance, ball milled in a ball mill for 18 hours, the mixture is put into an alumina crucible, and pre-fired in a muffle furnace with a maximum temperature of 720°C and kept for 5 hours. After the powder is ground, it is ball milled in a ball mill for 72 hours, the powder is taken out, and then dried. The piezoelectric ceramic powder and polyvinyl alcohol piezoelectric ceramic powder are weighed as 5wt%, and the mass fraction of polyvinyl alcohol is 16%. ), using 80MPa pressure for pre-compression molding, then wrapping the sample with a vacuum compressor, and using an isostatic pressing molding process to further densify the embryo body with a pressure of 170MPa. Place the embryo body in a muffle furnace, and slowly raise the temperature ...

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Abstract

The invention provides a multielement-doped bismuth titanate group lead-free piezoceramic material and a preparation method thereof. Bi4Ti3-2xNbxTax-ySbyO12 ceramic is prepared by an isostatic pressing mode and a conventional solid phase sintering method, wherein x is more than 0 and is less than or equal to 0.1, and y is more than 0 and is less than or equal to 0.1. The preparation method comprises the steps of taking a Bi4Ti3O12 system as a base, taking Nb2O5, Ta2O5 and Sb2O3 as adulterants, and doping a bismuth titanate group lead-free piezoceramic material by multielements (Nb, Ta and Sb); and after mixed ball milling, drying, pre-synthesizing, briquetting, discharging plastic, sintering to power materials under the temperature of 1050-1150DEG C to prepare the compact and lead-free piezoceramic material. By combining the isostatic pressing mode with the conventional solid phase sintering method, the piezoelectric coefficient (d33) of the prepared bismuth titanate group lead-free piezoceramic material is as high as 35pC / N, and the curie temperature of the material is kept to be more than 630DEG C. Furthermore, the preparation technology is stable and reliable, meets the practical applicability requirement of the piezoceramic material, and can be used under special high-temperature environments such as aerospace, aviation, petrochemical industryies, and the like.

Description

technical field [0001] The invention relates to a piezoelectric ceramic material and a preparation method of the piezoelectric ceramic material, belonging to the field of functional ceramics, in particular to a multi-element doped bismuth titanate-based lead-free piezoelectric ceramic material and a preparation method thereof. Background technique [0002] Piezoelectric ceramics is a functional ceramic material that can convert mechanical energy and electrical energy into each other. It is widely used in many fields closely related to people's lives to achieve energy conversion, sensing drive, frequency control, etc. Function. In terms of energy conversion, piezoelectric igniters, mobile X-ray machine power supplies, shell detonators, piezoelectric transformers, piezoelectric pickups, piezoelectric buzzers, piezoelectric horns, metal flaw detectors, and ultrasonic cleaning can also be manufactured. , Ultrasound Medical, Ultrasonic Cutter. In terms of sensing, it can be app...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/622H01L41/187H01L41/39H10N30/093H10N30/853
Inventor 侯军刚曲远方
Owner UNIV OF SCI & TECH BEIJING