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A kind of non-stoichiometric bismuth sodium titanate based ceramics and its preparation method and application

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

Active Publication Date: 2021-02-02
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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  • A kind of non-stoichiometric bismuth sodium titanate based ceramics and its preparation method and application
  • A kind of non-stoichiometric bismuth sodium titanate based ceramics and its preparation method and application
  • A kind of non-stoichiometric bismuth sodium titanate based ceramics and its preparation method and application

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 0.5 mm, and silver electrodes were placed on the upper and lower surfaces of the sheet 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 a non-stoichiometric bismuth sodium titanate-based ceramic and its preparation method and application. The raw material composition is 0.99Bi 0.5+x (Na 0.8 K 0.2 ) 0.5 TiO 3 ‑0.01SrTiO 3 , where x=0~0.025. The present invention adopts the preparation method of traditional solid phase sintering, and the raw material Bi 2 o 3 、Na 2 CO 3 、K 2 CO 3 、TiO 2 , SrCO 3 Mixing, ball milling, drying, pre-calcination at 850°C, ball milling, drying, granulation, molding, debinding, and sintering at 1140-1160°C to obtain ceramic samples. Compared with traditional electrostrain materials, the material of the present invention has the most significant advantage of being an environmentally friendly material, and has high electrostrain and good temperature stability, and can be widely used in electronic components such as piezoelectric sensors and drivers.

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 Patents(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