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Non-stoichiometric sodium bismuth titanate based ceramic as well as preparation method and application thereof

A non-stoichiometric ratio, sodium bismuth titanate-based technology is applied in the field of non-stoichiometric ratio sodium bismuth titanate-based ceramics and its preparation, and achieves the effects of repeatable production process, simple production process and high electro-strain performance.

Active Publication Date: 2017-07-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few literature reports on Bi-element non-stoichiometric BNT-based ceramics with high electrostrain

Method used

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  • Non-stoichiometric sodium bismuth titanate based ceramic as well as preparation method and application thereof
  • Non-stoichiometric sodium bismuth titanate based ceramic as well as preparation method and application thereof
  • Non-stoichiometric sodium bismuth titanate based ceramic as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) According to 0.99Bi 0.50+x (Na 0.8 K 0.2 ) 0.5 TiO 3 -0.01SrTiO 3 , the formula composition of Bi, Na, K, Ti, Sr in x=0, weighing the raw materials, mixing, and ball milling for 12 hours to obtain the raw material powder, after drying, pre-calcining at 850°C for 4 hours to obtain the pre-synthesized powder, the pre-synthesized The powder was milled twice for 12 hours. Dry the abrasive and add 8wt% PVA for granulation, and then mold it at 50-100MPa to obtain a disc with a diameter of 10mm and a thickness of 0.8-1.0mm. After debinding at 550°C, sinter at 1150°C for 3 hours to obtain the required ceramic material.

[0028] The sintered ceramic sheet was thinned and polished to obtain a thin sheet with a thickness of 0.5mm, and the upper and lower surfaces of the sheet were covered with silver electrodes to test the electrostrain performance.

Embodiment 2

[0030] (1) According to 0.99Bi 0.50+x (Na 0.8 K 0.2 ) 0.5 TiO 3 -0.01SrTiO 3The formula composition of Bi, Na, K, Ti, Sr in x=0.01 Weigh the raw materials, mix them and ball mill them for 12 hours to obtain the raw material powders, dry them at 850°C for 4 hours to obtain the pre-synthesized powders, and ball mill them for the second time Composite powder was obtained after 12h. Dry the composite powder and add 8wt% PVA for granulation, and then mold it at 50-100MPa to obtain a disc with a diameter of 10mm and a thickness of 0.8-1.0mm. After debinding at 550°C, sinter at 1150°C for 3 hours to obtain a ceramic sample.

[0031] The ceramic sample was thinned and polished to obtain a thin slice with a thickness of 0.5 mm, and silver electrodes were placed on the upper and lower surfaces of the slice to test the electrostrain performance.

Embodiment 3

[0033] (1) According to 0.99Bi 0.50+x (Na 0.8 K 0.2 ) 0.5 TiO 3 -0.01SrTiO 3 , The formula composition of Bi, Na, K, Ti, Sr in x=0.02 Weigh raw materials, mix, and ball mill for 12 hours to obtain raw material powder. The dried powder was calcined at 850° C. for 4 hours to obtain a pre-synthesized powder, and the pre-synthesized powder was ball-milled for a second time for 12 hours. After the abrasive is dried, 8wt% PVA is added for granulation, and then molded at 50-100MPa to obtain a disc with a diameter of 10mm and a thickness of 0.8-1.0mm. After debinding at 550°C, sinter at 1150°C for 3 hours to obtain a ceramic sample.

[0034] The sintered ceramic sheet was thinned to 0.5 mm, and polished to obtain a bright surface, and silver electrodes were placed on the upper and lower surfaces of the sheet, and the electrostrain performance was tested.

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Abstract

The invention relates to non-stoichiometric sodium bismuth titanate based ceramic as well as a preparation method and an application thereof. Raw material composition is as follows: 0.99Bi0.5+x(Na0.8K0.2)0.5TiO3-0.01SrTiO3, wherein x=0-0.025. The preparation method employs traditional solid phase sintering, raw materials Bi2O3, Na2CO3, K2CO3, TiO2, and SrCO3 are mixed, primary ball milling and drying are carried out, and pre-burning is carried out at 850 DEG C; secondary ball milling, drying, granulation, moulding and rubber discharging are carried out, sintering is carried out at 1140-1160 DEG C, and a ceramic sample is obtained. Compared with traditional electrostrictive materials, the ceramic has most substantial advantage of environment friendly materials, and the ceramic has high electrostrictive strain and good temperature stability; and the material can be widely applied to piezoelectric transducers, drivers and other electronic components.

Description

technical field [0001] The invention belongs to the field of lead-free piezoelectric ceramic materials, and in particular relates to a non-stoichiometric bismuth sodium titanate-based ceramic and a preparation method and application thereof. Background technique [0002] Piezoelectric ceramics are a new type of functional material that can convert mechanical energy and electrical energy. Piezoelectric ceramics are widely used in various devices such as sensors, drives, and transducers. Their application fields involve machinery, communications, precision control, and electronics. , medical and other fields. With the rapid development of modern society, the research methods and test and characterization methods of materials have been greatly improved, and the research on the microstructure and macroscopic electrical properties of piezoelectric ceramics has become more and more in-depth, which has greatly developed piezoelectric ceramics. It further promotes the development a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
CPCC04B35/475C04B35/622C04B2235/3201C04B2235/3213C04B2235/3236C04B2235/96
Inventor 翟继卫刘星李峰李朋沈波
Owner TONGJI UNIV