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Preparation method of barium titanate powder body

A technology of powder and metatitanic acid, applied in chemical instruments and methods, calcium carbonate/strontium/barium, titanium compounds, etc., can solve the problems of uneven particle size, narrow particle distribution, and single shape of the product, and achieve high Material properties and chemical activity, narrow particle distribution, good dispersion effect

Inactive Publication Date: 2004-09-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the shortcomings of uneven particle size and poor dispersibility of the product obtained by the existing preparation method, the present invention proposes an ultrafine BaTiO with narrow particle distribution, single shape and good dispersibility. 3 Powder preparation method

Method used

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  • Preparation method of barium titanate powder body
  • Preparation method of barium titanate powder body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Proportional to 38gTiCl 4 Slowly add 200g of water under stirring to obtain a concentration of 7% (as TiO 2 count) TiOCl 2 Aqueous solution, during which TiCl is absorbed by water 4 Hydrogen chloride gas released by hydrolysis; subsequently to TiOCl 2 Add 18.6g BaCl to the solution 2 solid, and stirred to completely dissolve; then, under stirring conditions, add solid sodium hydroxide to the solution until the pH value of the system reaches 7, continue to add solid sodium hydroxide, so that the alkali concentration of the system is 2.0mol / L, stir fully to make the system Uniformly; Finally, add 18mL ethanol to the above slurry, stir to disperse evenly; put the mixture into a reaction kettle, react at 180°C for 12 hours, and cool the reaction kettle to room temperature naturally, filter the product, wash with deionized water, Dry at 120 °C for 2 hours to obtain nano-BaTiO 3 Powder. The powder has a cubic phase structure, and the particles are uniform spherical with...

Embodiment 2

[0021] Proportional to 38gTiCl 4 Slowly add 200g of water under stirring to obtain a concentration of 7% (as TiO 2 count) TiOCl 2 Aqueous solution, during which TiCl is absorbed by water 4 Hydrogen chloride gas released by hydrolysis; subsequently to TiOCl 2 Add 18.6g BaCl to the solution 2 solid, and stirred to completely dissolve; then, under stirring conditions, add solid sodium hydroxide to the solution until the pH value of the system reaches 7, continue to add solid sodium hydroxide, so that the alkali concentration of the system is 2.0mol / L, stir fully to make the system uniform; finally add 18mL triethylenetetramine to the above slurry, stir to disperse evenly; put the mixture into the reaction kettle, react at 180°C for 12 hours, the reaction kettle is naturally cooled to room temperature, filter the product, and use Washed with ion water and dried at 120°C for 2 hours to obtain nano BaTiO 3 Powder. The powder has a cubic phase structure, the particles are unifo...

Embodiment 3

[0023] Proportional to 61 grams of TiCl 4 Slowly add 200 grams of deionized water under stirring to obtain a concentration of 10% (as TiO 2 count) TiOCl 2 Aqueous solution, during which TiCl is absorbed by water 4 Hydrogen chloride gas released by hydrolysis; then heat the solution to 110°C under stirring, keep it warm for 2 hours, cool to room temperature, filter and wash to obtain metatitanic acid. Add metatitanic acid and 202g of barium hydroxide octahydrate to 350g of deionized water, stir and beat to make the mixture uniform, put the slurry into the reaction kettle, and conduct a hydrothermal reaction at 200°C for 2 hours, the reaction kettle is naturally cooled to room temperature, and the product is Filter, wash with deionized water, and dry at 120°C for 2 hours to obtain BaTiO 3 Powder. The powder has a cubic phase structure, the particles are uniform spherical, the particle size is 100-120nm, and the transmission electron microscope observation has good dispersion...

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Abstract

The preparation method of barium titanate (BaTiO3) includes the following steps: using titanium tetrafluoride and barium chloride or barium hydroxide as main raw material to prepare precursor body slurry liquor, then adding organic additive according to a certain ratio, placing them into reaction still to make hydrothermal reaction so as to obtain the invented product BaTiO3 powder body whose grain size is 20-200 nm. Said invented advantage lies in that it utilizes the regulation of class of organic additive and reaction condition to can regulate grain size distribution of product and make its product possess good grain uniformity, high sintering activity, high material property and chemical activity, and said method is easy to implement large-scale industrial production.

Description

(1) Technical field [0001] The present invention relates to a kind of barium titanate (BaTiO 3 ) powder preparation method, which belongs to the field of inorganic non-metallic materials. (2) Background technology [0002] BaTiO 3 It has excellent electrical properties, and has good dielectric, ferroelectric and piezoelectric properties. It can be used to manufacture nonlinear element dielectric amplifiers, memory components of electronic computers, and ceramic capacitors with small volume and large capacitance. In recent years, with the development of computer, audio, TV, mobile phone and other electronic industries, BaTiO 3 Great development has been made in ceramic capacitors, but BaTiO 3 The particle size, uniformity, purity and dispersion of powder have a great influence on the performance of electronic ceramic devices. At present, the size of capacitors on the market is about 0.5 mm × 0.5 mm × 1 mm. If the powder material with small particle size, high uniformity a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/00C01F11/18C01G23/00C04B35/468
Inventor 陈代荣焦秀玲
Owner SHANDONG UNIV
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