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Method for preparing barium titanate nano powder

The technology of barium titanate powder and nano powder is applied in the field of preparation of nano powder and can solve the problems of high cost, complicated preparation process, poor crystallinity of powder and the like

Inactive Publication Date: 2010-10-06
江苏晨朗电子集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the preparation process of barium titanate nanopowder by wet chemical method is complicated and the cost is high
[0003] The document "Li Xia, Li Zhenwen, Synthesis and Research of Co-precipitation Method, Piezoelectricity and Acousto-Optics, 31(4), 2009, 528-534" discloses a preparation method of barium titanate nanopowder, and the document adopts the co-precipitation method , the barium titanate powder with a particle size of 60nm was prepared by optimizing the dispersant concentration, calcination temperature and other process conditions, but the preparation process is complicated, and there are many influencing factors such as reaction temperature and additive concentration. The pure-phase barium titanate powder has a high calcination temperature, and it can be seen from the XRD pattern given in the literature that the crystallinity of the powder is not good

Method used

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  • Method for preparing barium titanate nano powder
  • Method for preparing barium titanate nano powder
  • Method for preparing barium titanate nano powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1, in reaction vessel, add 1.3918g barium hydroxide octahydrate and 1.5ml tetra-n-butyl titanate respectively, wherein the mol ratio of barium hydroxide octahydrate and tetra-n-butyl titanate is 1: 1; Tighten and seal the reactor, then put the reactor into a tube furnace with a nitrogen atmosphere and calcined to 750°C, and keep it warm for 2 hours to obtain carbon-containing barium titanate powder; put the carbon-containing barium titanate powder in the air Calcinate to 500°C for decarburization and keep warm for 40 minutes; wash the decarburized powder with hydrochloric acid, then rinse and filter with deionized water repeatedly until the pH value of the filtered deionized water is neutral; then place the powder in Dry in oven. figure 1 (a) is the X-ray diffraction pattern of barium titanate powder when the ratio of barium to titanium is 1. It can be seen from the figure that there are still sharp Ilmenite and titanium dioxide exist, and the tetragonality ...

Embodiment 2

[0017] Embodiment 2, in reaction vessel, add 1.5310g barium hydroxide octahydrate and 1.5ml tetra-n-butyl titanate respectively, wherein the mol ratio of barium hydroxide octahydrate and tetra-n-butyl titanate is 1.1: 1; Reaction Tighten and seal the reactor, then put the reactor into a tube furnace with a nitrogen atmosphere to calcinate to 700°C, and keep it warm for 3.5 hours to obtain carbon-containing barium titanate powder; put the carbon-containing barium titanate powder in the air Calcinate to 520°C for decarburization and keep warm for 35 minutes; wash the decarburized powder with hydrochloric acid, then rinse and filter with deionized water repeatedly until the pH value of the filtered deionized water is neutral; then place the powder in Dry in oven. figure 1 (b) is the X-ray diffraction pattern of barium titanate powder when the ratio of barium to titanium is 1.1:1. It can be seen from the figure that the barium titanate powder There is still anatase titanium dioxi...

Embodiment 3

[0018] Embodiment 3, in reaction vessel, add 1.8093g barium hydroxide octahydrate and 1.5ml tetra-n-butyl titanate respectively, wherein the mol ratio of barium hydroxide octahydrate and tetra-n-butyl titanate is 1.3: 1; Tighten and seal the reactor, then put the reactor into a tube furnace with a nitrogen atmosphere and calcined to 730°C, and keep it warm for 3 hours to obtain carbon-containing barium titanate powder; put the carbon-containing barium titanate powder in the air Calcined to 550°C for decarburization, heat preservation for half an hour; wash the decarburized powder with hydrochloric acid, and then repeatedly rinse and filter with deionized water until the pH value of the filtered deionized water is neutral; then place the powder in Dry in oven. figure 1 (c) is the X-ray diffraction pattern of barium titanate powder when the ratio of barium to titanium is 1.3:1. It can be seen from the figure that the barium titanate powder There is still anatase titanium dioxid...

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Abstract

The invention discloses a method for preparing barium titanate nano powder for solving the technical problem that the conventional method for preparing the barium titanate nano powder has high calcining temperature. The invention adopts the technical scheme that the method comprises the following steps of: adding barium octahydrate and tetrabutyl titanate into a reaction container, sealing the reaction container, then putting the reaction container into a tube furnace introduced with nitrogen atmosphere, and calcining the mixture to obtain carbon-containing barium titanate powder; calcining the carbon-containing barium titanate powder in the air to remove carbon; washing the barium titanate powder after carbon removal by using hydrochloric acid, and repeatedly flushing and filtering the barium titanate powder by using deionized water till the pH value of the filtered deionized water is neutral; and drying the barium titanate powder in an oven. Because the pressure in the closed reaction container is improved by using the gas released in a tetrabutyl titanate cracking process, the calcining temperature of the barium titanate nano powder preparation process is reduced to about 650 to 750 DEG C from 900 DEG C of the background technology.

Description

technical field [0001] The invention relates to a preparation method of nano powder, in particular to a preparation method of barium titanate nano powder. Background technique [0002] Barium titanate is a very important electronic ceramic material, which is widely used in scientific research and industrial products. In order to adapt to the development trend of device miniaturization, the preparation of barium titanate nanopowder with excellent performance has become a new development direction. At present, the preparation process of barium titanate nanopowder by wet chemical method is complicated and the cost is high. [0003] The document "Li Xia, Li Zhenwen, Synthesis and Research of the Co-precipitation Method, Piezoelectricity and Acousto-Optics, 31(4), 2009, 528-534" discloses a preparation method of barium titanate nanopowder, and the document adopts the co-precipitation method Barium titanate powder with a particle size of 60nm was prepared by optimizing the dispe...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/626
Inventor 樊慧庆任鹏荣
Owner 江苏晨朗电子集团有限公司