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Solid phase synthetic method of niobate-titanate nano-powder

A nano-powder, solid-phase synthesis technology, applied in the field of functional ceramics, can solve problems such as difficulty in large-scale industrialization and poor compatibility, and achieve the effects of reducing pollution, expanding production capacity, and increasing chemical reaction area

Inactive Publication Date: 2010-08-11
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of a large amount of corrosive and polluting raw materials such as potassium hydroxide, nitric acid, and ammonia water in the process, as well as the limitation of the yield of sol-gel itself, the process has poor compatibility with the environment and is difficult for large-scale industrialization. change

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0012] Put niobium pentoxide, sodium carbonate, potassium carbonate, titanium dioxide, and bismuth trioxide into separate nylon jars for ball milling, the mass of the added powder is 8% of the mass of the zirconia ball, and the speed is 400 rpm , the ball milling time is 8 hours; the ball milling medium is absolute ethanol. The raw material for ball milling is 0.8[(Na 0.5 K 0.5 )NbO 3 ]-0.2(Bi 0.5 Na 0.5 )TiO 3 ] The ingredients are put into the ball mill jar; the zirconia ball and the nylon jar are selected; the mass of the added powder is 8% of the ball mass; the ball milling time is 6 hours, the rotating speed is 420 rpm, and the ball milling medium is absolute ethanol. The obtained product was baked in an oven at 80°C for 2 hours, and pre-fired at 760°C for 2 hours; the pre-fired powder was taken out and ground, and ball milled again for 2 hours; passed through a 120-mesh sieve. Use X-ray diffraction to identify the phase and crystal structure of the powder and calcu...

Embodiment 2

[0014] Put niobium pentoxide, sodium carbonate, potassium carbonate, titanium dioxide, and bismuth trioxide into separate nylon tanks for ball milling, the mass of the added powder is 12% of the mass of the zirconia ball, and the speed is 430 rpm , the ball milling time is 4 hours; the ball milling medium is absolute ethanol. The raw material for ball milling is 0.1[(Na 0.5 K 0.5 )NbO 3 ]-0.9(Bi 0.5 Na 0.5 )TiO 3 ] The ingredients are put into the ball mill jar; the zirconia ball and the nylon jar are selected; the mass of the added powder is 4% of the ball mass; the ball milling time is 2 hours, the rotating speed is 320 rpm, and the ball milling medium is absolute ethanol. The obtained product was baked in an oven at 60°C for 3 hours, and pre-fired at 660°C for 3 hours; the pre-fired powder was taken out and ground, ball milled again for 2 hours; passed through a 120-mesh sieve. Use X-ray diffraction to identify the phase and crystal structure of the powder and calcula...

Embodiment 3

[0016] Put niobium pentoxide, sodium carbonate, potassium carbonate, titanium dioxide, and bismuth trioxide into separate tungsten carbide pots for ball milling, the mass of the added powder is 5% of the mass of the tungsten carbide ball, and the speed is 420 rpm Minutes, the ball milling time is 2 hours; the ball milling medium is absolute ethanol. The raw materials for ball milling are stoichiometrically (Na 0.5 K 0.5 )NbO 3 Put the ingredients into the ball mill jar; select tungsten carbide balls and tungsten carbide jars; the mass of the added powder is 4% of the ball mass; the ball milling time is 2 hours, the speed is 400 rpm, and there is no ball milling medium. The obtained product was baked in an oven at 80°C for 1 hour, and pre-fired at 840°C for 2 hours; the pre-fired powder was taken out and ground, and ball milled again for 2 hours; passed through a 120-mesh sieve. Use X-ray diffraction to identify the phase and crystal structure of the powder and calculate the...

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Abstract

The invention discloses a solid phase synthetic method of niobate-titanate nano-powder. Niobium pentaoxide, sodium carbonate, potassium carbonate, titanium dioxide and bismuth trioxide are in ball milling in advance; raw materials are refined and burdened according to the stoichiometric ratio of (1-x) [(Na0.5K0.5)NbO3]- x[(Bi0.5Na0.5)TiO3], wherein x is more than or equal to 0.00 and is less than or equal to 1.00; and working procedures, such as secondary ball milling for mixing materials, preburning, secondary ball milling and the like, are adopted, solid phase reaction and carbonate decomposable process are utilized to finally prepare potassium-sodium niobate, sodium bismuth titanate or sodium potassium bismuth titanate powder of which the particle size is below 80 nanometers. The method of the invention can prepare a series of niobate-titanate electric ceramics nano-powder, can satisfy requirements of different fields, is simple, has energy saving, emission reduction and moderate cost and is suitable for volume production.

Description

technical field [0001] The invention relates to a solid phase synthesis method of niobium titanate nanopowder, which belongs to the field of functional ceramics. Background technique [0002] Literature "Wang Chao, Hou Yudong, Wu Ningning, Zhu Mankang, Yan Hui, Lithium, Sodium and Potassium Niobate Nanopowders Prepared by a New Sol-Gel Method, Journal of Zhengzhou University, 2009, 31(1): 75-77" using complexation method Will Nb 2 o 5 Converted into soluble niobium salt to replace expensive niobium ethanol as niobium source, using sol-gel method, synthesized nanometer (Li 0.06 Na 0.47 K 0.47 )NbO 3 Ultrafine powder. However, due to the use of a large amount of corrosive and polluting raw materials such as potassium hydroxide, nitric acid, and ammonia water in the process, as well as the limitation of the yield of sol-gel itself, the process has poor compatibility with the environment and is difficult for large-scale production. change. Contents of the invention [...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/462
Inventor 刘来君方亮黄瑞京杨曌胡长征
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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