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Preparation method of barium titanate and barium titanate powder prepared from the barium titanate

A technology of barium titanate and powder, which is applied in the direction of titanate, alkaline earth metal titanate, chemical instruments and methods, and can solve problems such as melting

Active Publication Date: 2017-04-12
SAMSUNG ELECTRO MECHANICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the preparation of said sintering agent, there is the disadvantage that melting at a high temperature of 1400-1500°C is required, and a separate process for mixing with dielectric powder is also required

Method used

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  • Preparation method of barium titanate and barium titanate powder prepared from the barium titanate
  • Preparation method of barium titanate and barium titanate powder prepared from the barium titanate
  • Preparation method of barium titanate and barium titanate powder prepared from the barium titanate

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preparation example Construction

[0036] figure 1 It is a flowchart of the preparation method of barium titanate powder according to an embodiment of the present invention. refer to figure 1 , The method for preparing barium titanate according to an embodiment of the present invention includes: preparing a barium hydroxide raw material (S1) with ionized barium (Ba) by increasing the relative temperature; preparing a titanium (Ti) raw material dispersed in acid or alkali (S2); mixing and reacting the barium hydroxide raw material and the titanium raw material to obtain a barium titanate seed crystal (S3); mixing the barium titanate seed crystal with a sintering accelerator (S4); and completing the grain Growth (S5).

[0037] Barium hydroxide was used as the barium raw material. Stir barium hydroxide octahydrate (Ba(OH) 2 8H 2 O) The formation of barium carbonate due to carbon dioxide in the air can be prevented, and barium hydroxide octahydrate can be completely dissolved by raising the temperature to 70° ...

Embodiment 1

[0060] Example 1) Synthesis of barium titanate powder containing added lithium hydroxide

[0061] Barium Hydroxide Octahydrate (Ba(OH) 2 8H 2 O) After being injected into the reaction vessel and purged with nitrogen gas, the purged material was stirred at 95° C. or higher to dissolve it. Titanium dioxide (TiO 2 ) Sol. Inject barium (Ba) solution and the titanium dioxide (TiO 2 ) sol into the reactor, high-speed stirring at 95°C or higher to collect barium titanate seeds. After the shaped barium titanate seed crystals are transferred to the hydrothermal synthesis reactor, lithium hydroxide and pure water are added to make the lithium hydroxide concentration 2.0 mol%. The hydrothermal synthesis autoclave was cleaned at 260°C and dried in an oven at 150°C. Such as figure 2 As shown, the analysis results of the X-ray diffraction (XRD) of the barium titanate powder obtained through the above process, it can be known that there is no secondary phase passing through lithium (...

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Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing barium titanate and barium titanate powder manufactured by the same method.SOLUTION: The method of the present invention for manufacturing a high-crystallinity barium titanate comprises a step of preparing a barium hydroxide raw material provided by heating and ionizing barium (Ba), a step of preparing a titanium (Ti) raw material dispersed within an acid or base, a step of obtaining a barium titanate seed by mixing and reacting the barium hydroxide and titanium raw material, and a step of growing grains by mixing the barium titanate seed with pure water and a sintering accelerator. Since the barium titanate powder manufactured by the method of the present invention for manufacturing barium titanate exhibits an excellent particle size distribution and a low sintering commencement temperature, such problems as connectivity degradations due to the arising of peels at times of applications to laminate ceramic electronic components, etc. can be solved.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2012-0082777 filed with the Korean Intellectual Property Office on Jul. 27, 2012, the disclosure of which is incorporated herein by reference. technical field [0003] The invention relates to a method for preparing barium titanate with relatively low sintering temperature, and barium titanate powder prepared from the barium titanate. Background technique [0004] In accordance with the recent trend of becoming thinner and lighter, and achieving high capacitance, high reliability, etc., in electronic components, barium titanate crystal grains used as ferroelectric materials for multilayer ceramic capacitors (MLCC) are required to have excellent Dielectric constant and high reliability with small size. [0005] However, even in the development of fine-grained dielectric powders with high dielectric constants, there will be problems due to the high s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00
CPCB22F3/10B82B1/00C01F11/00C01G23/006C01P2004/61C01P2004/62C01P2004/64
Inventor 全炯俊崔畅学南光熙刘正勋尹基明金昶勋
Owner SAMSUNG ELECTRO MECHANICS CO LTD