Preparation method of ultra-fine particle of submicron barium titanate powder

A barium titanate powder and sub-micron technology, which is applied in the field of preparation of ultrafine powder of functional ceramic raw materials, can solve the problems of inability to adapt to the miniaturization of electronic components, difficulty in dispersing performance, and large differences in particle morphology. The effect of saving barium source raw materials, reducing reaction activation energy, and eliminating the formation of barium carbonate substances

Active Publication Date: 2018-01-09
安徽凯盛应用材料有限公司 +2
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Problems solved by technology

This method, such as the oxalate precipitation method, is used, but the barium titanate powder produced by the solid-state reaction method has a problem that the average particle size is relatively large, and polygonal barium titanate powder is often obtained after high-temperature calcination. Solid particles, there is a sintering phenomenon of hard agglomeration between particles, low purity after crushing, large difference in particle shape, poor particle size distribution, large dispersion, difficult to have good dispersion performance and other defects, cannot adapt to current electronic components Miniaturization requirements, in order to solve these problems, liquid-phase chemical reaction synthesis of ultra-fine functional ceramic powders with uniform appearance has attracted extensive attention and development

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  • Preparation method of ultra-fine particle of submicron barium titanate powder
  • Preparation method of ultra-fine particle of submicron barium titanate powder
  • Preparation method of ultra-fine particle of submicron barium titanate powder

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Embodiment 1

[0042] Embodiment 1. A method for preparing submicron barium titanate powder ultrafine particles provided by the present invention comprises the following steps:

[0043] Step 1. Prepare a nano-scale titanium source, using high-purity titanium tetrachloride as a raw material, hydrolyzing the mixed solution of absolute ethanol and water to obtain a titanium oxychloride solution, and then reacting the titanium oxychloride solution with ammonia water to obtain the required The titanium source is in the form of a gel, and the titanium source includes orthotitanic acid, metatitanic acid gel, titanium dioxide hydrate or a mixture of at least two of the above three.

[0044] Step 2, remove the chloride ions in the titanium source, wash the titanium source 2-6 times with deionized water, preferably 5 times in this solution, until the chloride ion content in the filtrate is less than 50ppm. Disperse the gel-like titanium source with a mixer, and then wash it with deionized water. After...

Embodiment 2

[0052] Embodiment two, on the basis of embodiment one, according to stoichiometric ratio, take the mixed solution of titanium tetrachloride and ethanol and water, titanium tetrachloride is slowly added in the mixed solution of ethanol and water, ethanol and water The concentration of the ethanol solution in the mixed solution is 15%, and the mixed solution is 3 times the weight of titanium tetrachloride. Slowly add the prepared titanium oxychloride solution into an ammonia solution to obtain a white ortho-titanic acid sol, and then perform electrodialysis to remove chloride ions until the concentration of chloride ions in the ortho-titanic acid sol solution is 500 ppm, and then filter and wash the dispersed slurry The material is washed until the chloride ion content in the slurry filtrate is lower than 50ppm, and then the filter cake is dried and dehydrated at high temperature to obtain a white metatitanic acid colloid. Add hydrogen peroxide and ammonia water while stirring i...

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Abstract

The invention relates to a preparation method of ultra-fine particle of submicron barium titanate powder. The preparation method comprises the following steps of preparing a nano titanium source; removing chlorine ions in the titanium source; preparing a collosol; preparing cubic phase barium titanate sizing agent in a reaction kettle; washing the cubic phase barium titanate sizing agent; preparing tetragonal phase barium titanate powder aggregating preliminarily, and preparing tetragonal phase barium titanate powder. The preparation method has the advantage that the tetragonal phase barium titanate particle synthesized in the method is uniform, is complete, has the dispersibility of 1.01-1.2, is controllable in average particle size and specific surface area, has the tetragonal phase crystallization rate greater than or equal to 1.010, and is highly pure. The preparation method overcomes the defects of existing industrial production process, improves the yield of base powder of MLCC products, and improves the production efficiency.

Description

technical field [0001] The invention relates to the technical field of preparation of ultrafine powder of functional ceramic raw materials, in particular to a method for preparing ultrafine particles of submicron barium titanate powder. Background technique [0002] Barium titanate functional ceramic powder material is the basic raw material of electronic ceramic components. Because of its high dielectric constant, good ferroelectricity, piezoelectricity, withstand voltage and insulation properties, it is widely used in electronics, thermals, acoustics, optics, etc. and other fields have been widely used. Therefore, it is also called the pillar of electronic industrial ceramics. This material is now widely used in the manufacture of various functional ceramic sensitive components, especially for positive temperature coefficient thermistors (PTC), small-scale multilayer ceramic capacitors (MLCC), piezoelectric ceramics, etc. [0003] It is well known that tetragonal barium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/626C04B35/624
Inventor 严回胡石磊韩晖王利秦云峰刘强王永和
Owner 安徽凯盛应用材料有限公司
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