Process for synthesizing high pure electronic grade barium titanate by liquid phase method

An electronic grade, barium titanate technology, applied in the direction of titanium compounds, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problems of uneven particle size distribution and powder purity that cannot be used to make base metal electrode ceramic capacitors. Low-level problems, to achieve the effect of single powder particle shape, good dispersion and high purity

Active Publication Date: 2008-12-31
仙桃市中星电子材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the technical problems of low powder purity, large particles and uneven particle size distribution in the production of barium titanate in the prior art.
[0006] The present invention also solves the technical problem that the barium titanate powder produced by the existing co-precipitation method, especially the oxalic acid method, cannot be used to make base metal electrode ceramic capacitors (BME-MLCC)

Method used

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  • Process for synthesizing high pure electronic grade barium titanate by liquid phase method
  • Process for synthesizing high pure electronic grade barium titanate by liquid phase method
  • Process for synthesizing high pure electronic grade barium titanate by liquid phase method

Examples

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Embodiment 1

[0020] Example 1: Dissolve barium chloride in deionized water to prepare a 1.0mol / L barium chloride solution; dissolve titanium tetrachloride in deionized water at 35°C to prepare 2.0mol / L titanium tetrachloride Hydration solution; then measure 1.05 liters of the above-mentioned barium chloride solution and 0.5 liters of the titanium tetrachloride hydration solution with a graduated cylinder, place them in the same container, add 0.45 liters of deionized water and stir until they are evenly mixed to make a barium-titanium mixed solution Standby: Dissolve 2.2mol oxalic acid in 2L deionized water, add barium chloride with 2% oxalic acid molar weight and stir, then filter out the precipitate, prepare 1.1mol / L oxalic acid solution, and then heat the oxalic acid solution to 60°C , under the condition of vigorous stirring, add polyethylene glycol with a total weight of 2‰ of the oxalic acid solution, and at the same time mix the barium-titanium solution with 0.4m 3 The flow rate of ...

Embodiment 2

[0021] Example 2: Dissolving barium chloride in deionized water to prepare a 1.2mol / L barium chloride solution; dissolving titanium tetrachloride in deionized water at 35°C to prepare 1.5mol / L titanium tetrachloride Hydration solution; then measure 0.875 liters of the above-mentioned barium chloride solution and 0.583 liters of the titanium tetrachloride hydration solution with a measuring cylinder, place them in the same container, add 0.542 liters of deionized water and stir until they are evenly mixed to make a barium-titanium mixed solution Standby; dissolve 2.2mol oxalic acid in 2L deionized water, add barium chloride with 2% oxalic acid molar weight and stir, then filter out the precipitate, and prepare a 1.1mol / L oxalic acid solution; then heat the oxalic acid solution to 50°C , under the condition of vigorous stirring, add polyethylene glycol with a total weight of oxalic acid solution of 3‰, and at the same time mix the barium-titanium solution with 0.5m 3 The flow ra...

Embodiment 3

[0022] Example 3: Dissolving barium chloride in deionized water to prepare a 1.3mol / L barium chloride solution; dissolving titanium tetrachloride in deionized water at 35°C to prepare 2.5mol / L titanium tetrachloride Hydration solution; then measure 0.77 liters of the above-mentioned barium chloride solution and 0.83 liters of the titanium tetrachloride hydration solution with a graduated cylinder, and mix them to make a barium-titanium mixed solution for subsequent use; dissolve 2.2mol oxalic acid in 1.83L deionized water, add oxalic acid Stir barium chloride with a molar mass of 2%, then filter out the precipitate, and prepare a 1.2mol / L oxalic acid solution; then heat the oxalic acid solution to 70°C, and add 2‰ of the total weight of the oxalic acid solution under vigorous stirring Polyethylene glycol, while barium titanium mixed solution with 0.3m 3 The flow rate of / h is added to the oxalic acid solution for reaction. During the reaction, the reaction temperature is conti...

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Abstract

The invention relates to a technique for synthesizing high-purity electronic grade barium titanate by a liquid phase method, which includes the following steps: oxalic acid is dissolved in deionized water, and barium chloride accounting for 2% of molar weight of oxalic acid is added in; the barium-titanium mixed solution is added into oxalic acid solution at the flow speed of 1.3-1.5m <3>/h for reaction; the obtained solid is put in a kiln for constant temperature calcination which lasts for 2-4 hours, then is taken out and processed by jet milling, placed in the kiln once more for secondary constant temperature calcination which lasts for 1-3 hours, and taken out for secondary jet milling and barium titanate powder is obtained finally. The barium titanate prepared by the invention has high purity, good dispersibility, uniform powder particle appearance and reasonable particle size. Therefore, the technique of the invention can solve the problem that the barium titanate powder prepared by the traditional method; more particularly, the existing coprecipitation method has sulphate impurities, severe glomeration, and the like, and can completely meet the requirements of the production of high-performance electronic components like base metal porcelain capacitors, etc.

Description

technical field [0001] The invention relates to a preparation process of barium titanate, in particular to a process for synthesizing high-purity electronic-grade barium titanate by a liquid phase method. Background technique [0002] Barium titanate powder is a dielectric material used to produce electronic components such as chip MLCC capacitors, PTC components, probes, and dielectric amplifiers. It is one of the most important raw materials in the electronics industry. At present, the domestic production of barium titanate powder mainly includes solid-phase method and liquid-phase method. Among them, the solid phase method is BaCO 3 and TiO 2 Mixing, calcining at a high temperature above 1200°C, and crushing to obtain barium titanate powder. Although the solid-phase method has the advantages of simple process and equipment, and easy access to raw materials, its products have many impurities, large particle size, and low reactivity. [0003] The liquid phase method inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C01F11/00C04B35/468
Inventor 赵中友黄敏杨锋林贡王敏
Owner 仙桃市中星电子材料有限公司
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