Nano barium titanate microcrystal and preparation method thereof, and barium titanate powder and preparation method thereof

A technology of barium titanate and nano-titanium dioxide, applied in the direction of titanate, alkaline earth metal titanate, etc., can solve the problem that it is difficult to meet the high-quality requirements of barium titanate, the particle size of barium titanate is large, and the particle size distribution is not concentrated, etc. problem, to achieve the effect of reducing production energy consumption and equipment cost, high purity and crystallinity, and narrow distribution interval

Active Publication Date: 2019-08-06
쑤저우바오순메이테크놀러지컴퍼니리미티드
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in previous studies, the particle size of barium titanate produced by the atmospheric pressure hydrothermal method is relatively large, generally above 100nm, and the particle size distribution is not concentrated and the dispersion is poor. Therefore, it is difficult to meet the requirements of the electronic ceramic industry for barium titanate. high-quality demand

Method used

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  • Nano barium titanate microcrystal and preparation method thereof, and barium titanate powder and preparation method thereof
  • Nano barium titanate microcrystal and preparation method thereof, and barium titanate powder and preparation method thereof
  • Nano barium titanate microcrystal and preparation method thereof, and barium titanate powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] At room temperature, uniformly disperse the nano-titanium dioxide powder in deionized water, stir slowly until the mixture is uniform, and obtain 100 g of a nano-titanium dioxide aqueous dispersion with a mass concentration of 48%, which is set aside.

[0073] Under the protection of atmospheric nitrogen atmosphere, 355g of barium hydroxide octahydrate and 150mL of deionized water were added into a three-necked round-bottomed flask, and heated and stirred at 100°C until the barium hydroxide was completely dissolved.

[0074] Quickly add the nano-titanium dioxide aqueous dispersion into the above-mentioned three-necked flask, and maintain the original heating power of the three-necked round-bottomed flask during the addition process, measure the temperature of the obtained mixed system at 97±2°C, continue stirring and raise the temperature to 100°C Reflux reaction for 5h. After the reaction is completed, the reaction product is taken out, filtered, washed and dried to ob...

Embodiment 2-3

[0077] The other operating steps in Examples 2-3 were the same as in Example 1, except that the reflux reaction time was changed to 10 h and 20 h respectively, to obtain nano barium titanate crystallites.

Embodiment 4

[0079] Keep the volume of deionized water constant, reduce the mass of titanium dioxide and barium hydroxide to half of the original respectively, then add 51g of sodium hydroxide, and keep the other operating steps consistent with Example 2 to obtain nano-barium titanate microcrystals.

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Abstract

The invention provides nano barium titanate microcrystals and a preparation method thereof, and barium titanate powder and a preparation method thereof, and relates to the technical field of nano materials. The preparation method of the nano barium titanate microcrystals comprises the following steps of: a nano titanium dioxide aqueous dispersion with the mass concentration of not less than 20% and a barium hydroxide aqueous solution are rapidly mixed to allow the temperature of the obtained mixed system to be at least 2 DEG C lower than the temperature of the barium hydroxide aqueous solutiondue to the rapid mixing of the two; under an inert atmosphere, the mixed system is subjected to normal pressure hydrothermal synthesis reaction at 90-110 DEG C, and reaction products are collected, washed and dried to obtain the nano barium titanate microcrystals. According to the preparation method of the nano barium titanate microcrystals, the nano barium titanate microcrystals with small particle diameter, uniform particle diameter distribution and high purity can be obtained, and the high-quality barium titanate powder can be obtained by calcining the nano barium titanate microcrystals serving as a raw material.

Description

technical field [0001] The invention relates to nanometer material technology, in particular to a nano barium titanate microcrystal and a preparation method thereof, barium titanate powder and a preparation method thereof. Background technique [0002] Barium titanate (BaTiO 3 ) is widely used in the electronic ceramic industry because of its good dielectric, ferroelectric and piezoelectric properties. Basic materials for electronic components. [0003] At present, the mainstream processes for producing nano-barium titanate powder can be roughly divided into solid-phase sintering method and liquid-phase synthesis method, and the liquid-phase synthesis method can be further divided into sol-gel method, co-precipitation method, and hydrothermal method. Wait. The solid-phase sintering method is to mix and grind the oxides or acid salts of the metal elements (Ti and Ba) that make up barium titanate, and then calcinate at a high temperature of about 1100°C to form the required...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/626
CPCC04B35/4682C04B35/62605C04B2235/5454C01G23/006C01P2004/64C04B2235/781
Inventor 瞿海锋
Owner 쑤저우바오순메이테크놀러지컴퍼니리미티드
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