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Preparation method of tungsten-doped vanadium dioxide superfine powder

An ultra-fine powder, vanadium dioxide technology, applied in vanadium oxide and other directions, can solve the problems of easy introduction of impurities, increase production cost, etc., and achieve the effects of improving preparation efficiency, increasing comfort, and short preparation period

Active Publication Date: 2016-05-11
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Therefore, in order to obtain ultrafine VO 2 Powder, usually need to increase VO after high temperature heat treatment 2 Powdering process, which will inevitably increase the production cost, and also easily introduce impurities

Method used

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  • Preparation method of tungsten-doped vanadium dioxide superfine powder

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preparation example Construction

[0033] A method for preparing tungsten-doped vanadium dioxide ultrafine powder, comprising the following steps:

[0034] Step 1: Preparation of tungsten-doped precursor

[0035] Vanadyl sulfate trihydrate VOSO 4 ·3H 2 O was dissolved in distilled water, and at the same time, soluble hexavalent tungsten compounds accounting for 0.1-5% of the total molar amount of vanadium elements were added and stirred evenly, then an alkaline solution was added, and the pH of the solution was slowly adjusted to 6-7 to obtain an off-white suspension; The suspension is filtered and cleaned to obtain an amorphous tungsten-doped precursor; the tungsten-doped precursor is put into a vacuum drying oven for drying, the drying temperature is 60-80°C, and the drying time is 24-48 hours. Agglomerated tungsten-doped precursor powder, the mesh number of the obtained tungsten-doped precursor powder is greater than 1000 mesh. The soluble hexavalent tungsten compound used is one or more of sodium tungsta...

Embodiment 1

[0045] A method for preparing tungsten-doped vanadium dioxide ultrafine powder, comprising the following steps:

[0046] Step 1: Preparation of tungsten-doped precursor

[0047] Vanadyl sulfate trihydrate VOSO 4 ·3H 2 O was dissolved in distilled water, and at the same time, a soluble hexavalent tungsten compound accounting for 1% of the total molar mass of vanadium was added and stirred evenly, and 0.01mol / L dilute NaHCO 3 The solution was added dropwise to the constantly stirring VOSO at a rate of 50mL / h using a syringe pump. 4 In the solution, control the pH value range from 6 to 7 to obtain an off-white suspension; filter and wash the suspension to obtain an amorphous tungsten-doped precursor; put the tungsten-doped precursor into a vacuum drying oven for drying, and the drying temperature The temperature is 80°C, and the drying time is 24 hours to obtain dry, loose, non-caking tungsten-doped precursor powder, and the mesh number of the obtained tungsten-doped precursor p...

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Abstract

The invention relates to a preparation method of tungsten-doped vanadium dioxide superfine powder, comprising the following steps: step 1, dissolving vanadyl sulfate trihydrate in distilled water, adding a soluble hexavalent tungsten compound accounting for 0.1-5 % of total molar weight of vanadium, adding an alkaline solution, adjusting solution PH to 6-7 to obtain a suspension, and suction filtering, washing and drying to obtain tungsten-doped precursor powder; step 2, pulverizing silica aerosol, screening with a screen to obtain silica aerosol powder; step 3, mixing the tungsten-doped precursor powder obtained in step 1 and the silica aerosol powder obtained in step 2 according to a weight ratio of 1-10:1 to obtain blend powder; step 4, thermally treating the blend powder obtained in step 3 under the protection of an inert gas, and then cooling, wherein thermal treatment temperature is 600-1000 DEG C and thermal treatment takes 3-8 h; step 5, screening the blend powder cooled in step 4 by using a 1000- to 3000-mesh screen so as to remove silica aerosol powder large in particle size.

Description

technical field [0001] The invention relates to a preparation method of vanadium dioxide powder, in particular to a preparation method of tungsten-doped vanadium dioxide ultrafine powder. Background technique [0002] Vanadium dioxide (VO 2 ) is a thermally induced phase-change metal compound, which undergoes a sudden change from a low-temperature semiconductor phase to a high-temperature metal phase around 68 °C. During the phase transition process, the electrical resistance of the material undergoes a sudden change of 2 to 4 orders of magnitude, accompanied by sudden changes in the optical refractive index, transmittance, and reflectance, especially in the infrared and near-infrared bands. The optical transmittance changes most obviously. Below the phase transition temperature, VO 2 The infrared and near-infrared transmittance is higher; but when the temperature is higher than the phase transition temperature, VO 2 The infrared and near-infrared transmittances have a si...

Claims

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Application Information

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IPC IPC(8): C01G31/02
CPCC01G31/02C01P2002/88C01P2004/61
Inventor 吴会军陈奇良丁云飞何清衡
Owner GUANGZHOU UNIVERSITY
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