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Bismuth sodium titanate-barium titanate base piezoelectric ceramic and its prepn process

A technology of barium titanate and electric ceramics, applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problem of high conductivity in the ferroelectric phase region, narrow working temperature, and stable temperature of performance parameters In order to reduce the coercive field and resistivity, the chemical process is simple and easy, and the production cost is low.

Inactive Publication Date: 2005-09-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology reduces the size (volume) or number of defects on crystalline materials used in electronic devices such as sensors that require high performance characteristics at very small sizes. By adjusting certain factors during manufacturing processes, these improvements result in improved device reliability without compromising their effectiveness over longer periods of time. Additionally, this new material has specific advantages compared to existing methods like BSTO3-based ferroelectrics while also having fewer limitations when applied to other types of materials.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the performance of piezocrystals made from bismatic natrium calcium tantalatostimulant due to their ability to create stress when subjected to mechanical stimulation or pressure changes without losing any energy stored within them.

Method used

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  • Bismuth sodium titanate-barium titanate base piezoelectric ceramic and its prepn process
  • Bismuth sodium titanate-barium titanate base piezoelectric ceramic and its prepn process
  • Bismuth sodium titanate-barium titanate base piezoelectric ceramic and its prepn process

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1, with the bismuth trioxide that analysis pure level content is 99.0%, the sodium carbonate that content is 99.8%, the barium carbonate that content is 99.0%, the titanium dioxide that content is 98%, the tin oxide that content is 99.5%, press The stoichiometric ratio is 0.96[(Na 0.5 Bi 0.5 )TiO 3 ]-0.04BaTiO 3 -0.2wt%SnO 2 Weigh ingredients. Put the prepared material into the vibrating mill hopper and mix according to the ratio of iron ball: material 3:1, and do not add other media during the mixing process. The vibration grinding time is 6 hours, the mixed material briquette is pre-fired at 800°C for 1 hour, the calcined material is taken out and crushed, and then sieved after vibration grinding for 6 hours; Repeated rolling on the rolling machine for 1 hour, the final shape is 12×12×0.5mm 3 Put square slices in an oven at 120°C for 10 hours to dry into plain slices, then put the dried plain slices into the furnace to remove glue, the heating rate is...

Embodiment 2

[0030] Embodiment 2, with the bismuth trioxide that analysis pure level content is 99.0%, the sodium carbonate that content is 99.8%, the barium carbonate that content is 99.0%, the titanium dioxide that content is 98%, the tin oxide that content is 99.5%, press The stoichiometric ratio is 0.94[(Na 0.5 Bi 0.5 )TiO 3 ]-0.06BaTiO 3 -0.2wt%SnO 2 Weigh ingredients. Put the prepared material into the vibrating mill hopper and mix according to the ratio of iron ball: material 3:1, and do not add other media during the mixing process. The time of vibration grinding is 8 hours, and the mixed material briquette is pre-fired at 840 ° C for 1.5 hours, the calcined material is taken out and crushed, and then sieved after vibration grinding for 8 hours; Repeated rolling on the film machine for 1.5 hours, the final shape is 12×12×0.5mm 3Put the square sheet in an oven at 120°C for 11 hours to dry it into a plain sheet, then put the dried plain sheet in the furnace to remove the glue, ...

Embodiment 3

[0031] Embodiment 3, with the bismuth trioxide that analysis pure level content is 99.0%, the sodium carbonate that content is 99.8%, the barium carbonate that content is 99.0%, the titanium dioxide that content is 98%, the tin oxide that content is 99.5%, press The stoichiometric ratio is 0.92[(Na 0.5 Bi 0.5 )TiO 3 ]-0.08BaTiO 3 -0.2wt%SnO 2 Weigh ingredients. Put the prepared material into the vibrating mill hopper and mix according to the ratio of iron ball: material 3:1, and do not add other media during the mixing process. The time of vibratory milling is 10 hours, the mixed material briquette is pre-fired at 850°C for 2 hours, the calcined material is taken out and crushed, and then sieved after vibrating milling for 10 hours; Repeated rolling on the film machine for 2 hours, the final shape is 12×12×0.5mm 3 Put the square sheet in an oven at 120°C for 12 hours to dry it into a plain sheet, then put the dried plain sheet into the furnace to remove the glue, the hea...

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Abstract

The bismuth sodium titanate-barium titanate base piezoelectric ceramic contains bismuth oxide, sodium carbonate, barium carbonate, titania and tin oxide, and has the chemical composition of (1-x)[(Na0.5Bi0.5)TiO3]-xBaTiO3-ySnO2, where x is 0-0.1, and y is 0-0.1. The preparation process of the bismuth sodium titanate-barium titanate base piezoelectric ceramic includes material compounding, vibration milling to mix, pressing block, pre-sintering, adding adhesive, rolling, eliminating glue, sintering, silver sintering and final polarizing in silicon oil. The present invention has effectively lowered coercive field and resistivity of the piezoelectric ceramic and simple and feasible polarizing process, and the technological process may be used in preparing various kinds of lead-free piezoelectric ceramic of different piezoelectric and dielectric performances for need of different fields.

Description

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Claims

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Application Information

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Owner NORTHWESTERN POLYTECHNICAL UNIV
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