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Method for fast preparing micron-level lamellar barium titanate powder

A micron-scale, flaky technology, applied in chemical instruments and methods, nanotechnology, titanium compounds, etc., can solve the problems of low production efficiency, cumbersome process, difficult process control, etc., and achieve shortened production cycle and obvious flaky characteristics , The effect of reducing the process link

Active Publication Date: 2012-04-25
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a method for rapidly preparing micron-sized flaky barium titanate powder to overcome the tedious process existing in the prior art, and the product is affected by molten salt formation. The impact of inconsistent volatilization is greater, the process is not easy to control, the preparation cycle is too long, the production efficiency is not high, and it is difficult to realize the problems of industrialization

Method used

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  • Method for fast preparing micron-level lamellar barium titanate powder
  • Method for fast preparing micron-level lamellar barium titanate powder

Examples

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Effect test

Embodiment 1

[0027] Example 1 : A rapid preparation of micron-scale flake BaTiO 3 The method of powder, comprises the following steps successively:

[0028] The first step (1) will BaCO 3 Powder, TiO 2Powder and KF powder were mixed at a molar ratio of 1:1:49, using a polytetrafluoroethylene ball mill tank, agate balls, and anhydrous ethanol medium during the mixing process, and ball milled for 6 hours, then dried at 60-75°C for use; (2 ) Put the mixture into a platinum crucible, heat it in an ordinary crucible resistance furnace until it melts to obtain a melt, and keep the melt at 950±20°C for 2 hours for use; (3) Cool the melt until it solidifies to obtain a solidified structure;

[0029] The second step first place the coagulated tissue obtained in the first step in boiling deionized water for ultrasonic cleaning, pour off the clear liquid after standing still, and do this several times; then add NH 4 Cl dilute solution, perform ultrasonic cleaning, pour off the clear liquid after...

Embodiment 2

[0030] Example 2 : A rapid preparation of micron-scale flake BaTiO 3 The method of powder, comprises the following steps successively:

[0031] The first step (1) will BaCO 3 Powder, TiO 2 Powder and KF powder are mixed at a molar ratio of 1:1:62, and the mixing process uses a polytetrafluoroethylene ball mill jar, agate balls, and anhydrous ethanol medium, and the ball mill is mixed for 6 hours, and dried at 60-75°C for use; (2 ) Put the mixture into a platinum crucible, heat it in an ordinary crucible resistance furnace until it melts to obtain a melt, and keep the melt at 1030±20°C for 1.5 hours for use; (3) Cool the melt until it solidifies to obtain a solidified structure;

[0032] The second step first place the coagulated tissue obtained in the first step in boiling deionized water for ultrasonic cleaning, pour off the clear liquid after standing still, and do this several times; then add NH 4 Cl dilute solution, perform ultrasonic cleaning, pour off the clear liqu...

Embodiment 3

[0033] Example 3 : A rapid preparation of micron-scale flake BaTiO 3 The method of powder, comprises the following steps successively:

[0034] The first step (1) will BaCO 3 Powder, TiO 2 Powder and KF powder were mixed at a molar ratio of 1:1:41. During the mixing process, a polytetrafluoroethylene ball mill tank, agate balls, and anhydrous ethanol medium were used for ball milling and mixing for 6 hours, and dried at 60-75°C for use; (2 ) Put the mixture into a platinum crucible, heat it in an ordinary crucible resistance furnace until it melts to obtain a melt, and keep the melt at 880±20°C for 4 hours for use; (3) Cool the melt until it solidifies to obtain a solidified structure;

[0035] The second step first place the coagulated tissue obtained in the first step in boiling deionized water for ultrasonic cleaning, pour off the clear liquid after standing still, and do this several times; then add NH 4 Cl dilute solution, perform ultrasonic cleaning, pour off the cl...

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Abstract

The invention relates to a method for fast preparing micron-level lamellar barium titanate powder. The prior art is complex in technology, long in preparation period, and low in production efficiency. The method sequentially comprises the following steps of: preparing KF-BaTiO3 or BaTiO3 melting body of a hypo eutectic component, and cooling and solidifying the melting body to obtain a solidified tissue; and ultrasonically cleaning the other phases in the solidified tissue to obtain sheet BaTiO3 crystalloid powder. The method specifically comprises the steps: (1) mixing BaCO3 power, TiO2 power with KF power, performing the ball milling by the polytetrafluoroethylene during mixing, performing the polytetrafluoroethylene to the agate, performing the ball milling and mixing for 6 hours with water-free ethanol medium, and drying for later use; (2) heating in a common crucible resistance furnace to be melted to obtain the melting body, and keeping the temperature for 1-4 hours for later use; (3) cooling the melting body to be solidified so as to obtain the solidified tissue; and ultrasonically cleaning to remove the KF and the other impurities in the solidified tissue.

Description

technical field [0001] The present invention relates to micron-scale flaky BaTiO 3 The technical field of powder preparation method, in particular, relates to a method for rapidly preparing micron-sized flaky barium titanate powder. Background technique [0002] Micron flaky BaTiO 3 The powder is very suitable as a seed crystal for the preparation of high-performance textured piezoelectric ceramics by Templated Grain Growth, and has broad application prospects. [0003] Barium titanate (BaTiO 3 ) powder preparation methods, including co-precipitation method, microemulsion method, citric acid method, oxalate method, hydrothermal method, solution thermal synthesis method, Sol-gel method, metal organic compound pyrolysis method and organic salt-hydroxide However, none of these methods can prepare micron-scale flake BaTiO 3 Powder. At present, at home and abroad, only Tsinghua University and Japan's Keio University have prepared micron-scale flake BaTiO. 3 Powder reports a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00B82Y40/00
Inventor 惠增哲龙伟李晓娟刘建康
Owner XIAN TECH UNIV
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