Preparation method of size-controllable nanoscale cubic-phase super-fine barium titanate powder

Abstract

The invention discloses a preparation method of size-controllable nanoscale cubic-phase super-fine barium titanate powder. Relatively cheap titanium tetrachloride is used for preparing a titanium precursor solution TiClO2 through hydrolysis, the precursor solution is dropwise added into a mineralizing agent and dispersant solution, and continuous stirring is performed to obtain a titanium precursor gel solution; then centrifugal gel washing is performed to remove chloride ions, the prepared H4TiO4 gel and barium hydroxide or barium nitrate are grinded and dispersed with water and a dispersant according to a certain proportion to prepare mixed dispersed slurry, the mixed dispersed slurry is put into a reaction kettle for hydrothermal reaction, and then washing and drying are performed to obtain the nanoscale cubic-phase super-fine barium titanate powder good in dispersion and centralized in particle size, the average particle size of the power is smaller than 100 nm, and the specific surface area is within the range of 12.5-15.0 m<2> / g.

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 preparation technology of nanoscale barium titanate powder ultrafine particles. Background technique [0002] Barium titanate powder material is widely used in heat-sensitive components, ferroelectric components, multilayer ceramic capacitors, etc. as dielectric materials. [0003] With the rapid development of electronic information technology, there is a demand for miniaturization, light weight, high performance and stabilization of various electronic equipment accessories. The demand for nano-scale barium titanate functional ceramic powder materials with high dielectric constant is also in short supply, and it is even known as the pillar of electronic functional ceramic materials. Development hotspots and key development directions. [0004] Barium titanate powder has been paid attention to by the electronics indu...

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Problems solved by technology

[0010] Therefore, if the traditional method, such as the oxalic acid precipitation method in the patent CN1417162A, can meet the needs and purity requirements of common capacitor materials, but each purification process is time-consuming and increases production costs, and because the abrasive particles are very large, The shape is poor, the particle size distribution is not concentrated, and the energy consumption is large

Another example is the patent CN101428850A of TDK Corporation of Japan, which solves the problem of lengthy preparation process time by means of direct calcination by solid phase sintering method, but it still takes a lot of energy to achieve the above points and good condition control

[0011] Under normal circumstances, the oxalate co-precipitation method can obtain sub-micron ultrafine barium titanate powder, and some companies use this method, but there are many production processes, resulting in larger particles after the powder is agglomerated

At the same time, solid-phase sintering method, another method of severe powder agglomeration, is more difficult to obtain well-dispersed ultra-fine barium titanate powder

Relatively speaking, the sol-gel method can obtain powders with high nano-scale purity, but it is difficult to promote and adopt it in the large-scale production process due to its long growth cycle and high cost.

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