Preparation method of barium titanate-based ceramic powder

A technology of ceramic powder and barium titanate, which is applied in the field of piezoelectric ceramics, can solve the problems of widening, slow and uneven heating of synthetic powder size distribution, and achieve a higher proportion of grain boundaries, increase the reaction rate, Evenly distributed effect

Inactive Publication Date: 2018-05-01
李巧珍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing barium titanate-based ceramic powder in view of the problem of widening the size distribution of synthetic powder caused by uneven and slow heating in traditional methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Take 1mol of tetrabutyl titanate, add it to 500g of absolute ethanol, stir at 300r / min for 20min to obtain a mixed solution, take 1mol of barium nitrate, 0.002mol of ferric nitrate, and 10g of a mass fraction of 10% nitric acid solution, add 500g of deionized water , stirred at 300r / min for 20min, then added the mixture dropwise at 1mL / min, continued to stir until the dropwise addition was complete, then added 1L of oxalic acid solution with a molar concentration of 2mol / L, heated to 80°C for 2h in microwave, and cooled to room temperature Filter the filter residue, wash the filter residue twice with deionized water, then place the filter residue in a drying oven and dry at 80°C for 1 hour to obtain a precursor, which is placed in a muffle furnace and heated at 20°C / min to Calcined at 700°C for 1 hour, cooled to room temperature to obtain barium titanate nanopowder, took 100g barium titanate nanopowder, 1g dispersant OP-10, added 300g deionized water, stirred at 300r / min...

example 2

[0024] Take 1 mol of tetrabutyl titanate, add it to 800 g of absolute ethanol, stir at 350 r / min for 25 min to obtain a mixed solution, take 1 mol of barium nitrate, 0.003 mol of ferric nitrate, and 15 g of a mass fraction of 10% nitric acid solution, add 800 g of deionized water , stirred at 350r / min for 25min, then added the mixture dropwise at 1mL / min, continued to stir until the dropwise addition was complete, then added 1L of oxalic acid solution with a molar concentration of 2mol / L, and heated to 85°C for 2h in microwave, cooled to room temperature Filter the filter residue, wash the filter residue twice with deionized water, then place the filter residue in a drying oven, and dry it at 85°C for 1 hour to obtain a precursor, which is placed in a muffle furnace and heated at 20°C / min to Calcined at 720°C for 1 hour, cooled to room temperature to obtain barium titanate nanopowder, took 150g barium titanate nanopowder, 1g dispersant OP-10, added 500g deionized water, stirred...

example 3

[0026] Take 2mol of tetrabutyl titanate, add it to 1000g of absolute ethanol, and stir at 400r / min for 30min to obtain a mixed solution. Take 2mol of barium nitrate, 0.004mol of ferric nitrate, and 20g of a mass fraction of 10% nitric acid solution, and add it to 1000g of deionized water , stirred at 400r / min for 30min, then added dropwise the mixed solution at 2mL / min, continued to stir until the dropwise addition was complete, then added 2L oxalic acid solution with a molar concentration of 2mol / L, and heated to 90°C for 3h in microwave, cooled to room temperature Filter the filter residue, wash the filter residue 3 times with deionized water, then place the filter residue in a drying oven and dry at 90°C for 2 hours to obtain a precursor, which is placed in a muffle furnace and heated at 20°C / min to Calcined at 750°C for 2 hours, cooled to room temperature to obtain barium titanate nanopowder, took 200g barium titanate nanopowder, 2g dispersant OP-10, added 600g deionized wa...

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Abstract

The invention relates to a preparation method of barium titanate-based ceramic powder, and belongs to the technical field of piezoelectric ceramics. According to the preparation method, barium titanate tetragonal nano-powder is prepared by a microwave assisted oxalic acid precipitation method, and energy is transferred directly to a reaction system through microwave energy and internal heating generated by intermolecular interaction, so that intense molecular motion and friction are caused, and heat is produced. By means of heating through microwave absorption of substances, the reaction rateis increased, and the reaction activation energy is reduced. Meanwhile, the solution energy heating rate is increased, the influence of a heating process is lowered effectively, the whole sample quickly reaches a set temperature, the phenomenon of wider size distribution of synthetic powder caused by the factors of non-uniformity, low speed and the like in traditional heating is improved, and theprepared barium titanate nano-powder is high in crystallinity and purity, uniform in distribution and 30 to 50nm in grain size. By adopting the barium titanate-based ceramic powder, grain growth can be effectively inhibited, the ceramic density and ceramic impedance are increased, loss is reduced, and the breakdown field strength of ceramic materials is enhanced.

Description

technical field [0001] The invention relates to a preparation method of barium titanate-based ceramic powder, which belongs to the technical field of piezoelectric ceramics. Background technique [0002] In recent decades, through a lot of research, people have discovered barium titanate-based functional ceramic materials, which are a new type of modern functional ceramic materials. It has become the parent material for the manufacture of electronic ceramic components. As an advanced material, functional ceramics are widely used in technical fields such as electronic information, mobile communication, energy technology and national defense industry. With the rapid development of electronic information technology, functional ceramics are facing more severe challenges and huge development prospects, and various functional ceramics with different functions have sprung up in various industries. However, the traditional PZT-based ceramics will cause great harm to the environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/626C04B35/628
CPCC04B35/4682C04B35/626C04B35/62645C04B35/62805C04B35/62807C04B35/62813C04B35/62886C04B2235/3217C04B2235/3284C04B2235/3418C04B2235/443C04B2235/449
Inventor 李巧珍王文新蔡静
Owner 李巧珍
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