A composite powder of tungsten trioxide/vanadium dioxide with thermochromic properties and its preparation method and application

A thermochromic and composite powder technology, which is applied in the direction of tungsten oxide/tungsten hydroxide, vanadium oxide, etc., can solve the problems of complex chemical vapor deposition in the preparation process, and achieve obvious thermochromic effect, low equipment requirements, good thermal Effect of Chromogenic Properties

Active Publication Date: 2021-01-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are already a lot of information about WO 3 with VO 2 powder research, but the WO 3 with VO 2 There are few studies on phase recombination, and the previous preparation processes such as hydrothermal method, magnetron sputtering method and chemical vapor deposition method have been complicated

Method used

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  • A composite powder of tungsten trioxide/vanadium dioxide with thermochromic properties and its preparation method and application
  • A composite powder of tungsten trioxide/vanadium dioxide with thermochromic properties and its preparation method and application
  • A composite powder of tungsten trioxide/vanadium dioxide with thermochromic properties and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of WO 3 / VO 2 Composite powder, the steps are as follows:

[0037] (1) Weigh 0.4g of vanadium pentoxide and 0.025g of ammonium tungstate and place them in a mortar, grind for 15min to mix them evenly, and put them into a corundum crucible;

[0038] (2) take by weighing 0.2g ammonium bicarbonate and place in another corundum crucible;

[0039] (3) put the corundum crucible in (1) and (2) into the vacuum tube furnace, the vacuum degree is 50pa, with

[0040] 10°C / min to raise the temperature to 550°C, hold the temperature for 30 minutes, and cool down to room temperature with the furnace after the heat preservation is over to obtain WO 3 / VO 2 Composite powder.

[0041] The thermochromic properties of the obtained composite powder were characterized by spin coating method:

[0042] (4) When 0.3 g of the composite powder obtained in step (3) is ball milled and mixed with 0.15 g of PVP and 8 ml of ethanol solution for 8 hours, the mixture is centrifuged at...

Embodiment 2

[0046] Preparation of WO 3 / VO 2 Composite powder, the steps are as follows:

[0047] (1) Weigh 0.4g of vanadium pentoxide and 0.1g of ammonium tungstate and place them in a mortar, grind for 15min to make them evenly mixed, and then put them into a corundum crucible;

[0048] (2) take by weighing 0.2g ammonium bicarbonate and place in another corundum crucible;

[0049] (3) Put the corundum crucible in (1) and (2) into a vacuum tube furnace with a vacuum degree of 50 Pa, raise the temperature to 550°C at 10°C / min, keep it warm for 30min, and cool it down to room temperature with the furnace after the heat preservation is completed. WO 3 / VO 2 Composite powder.

[0050] The thermochromic properties of the obtained composite powder were characterized by spin coating method:

[0051] (4) When 0.3 g of the composite powder obtained in step (3) is ball milled and mixed with 0.15 g of PVP and 8 ml of ethanol solution for 8 hours, the mixture is centrifuged at a speed of 8000 ...

Embodiment 3

[0055] Preparation of WO 3 / VO 2 Composite powder, the steps are as follows:

[0056] (1) Weigh 0.4g vanadium pentoxide and 0.05g ammonium tungstate and place them in a mortar, grind for 15min to mix them evenly, and put them in a corundum crucible;

[0057] (2) take by weighing 0.2g ammonium bicarbonate and place in another corundum crucible;

[0058] (3) Put the corundum crucible in (1) and (2) into a vacuum tube furnace with a vacuum degree of 50 Pa, raise the temperature to 550°C at 10°C / min, keep it warm for 30min, and cool it down to room temperature with the furnace after the heat preservation is completed. WO 3 / VO 2 Composite powder.

[0059] The thermochromic properties of the obtained composite powder were characterized by spin coating method:

[0060] (4) When 0.3 g of the composite powder obtained in step (3) is ball milled and mixed with 0.15 g of PVP and 8 ml of ethanol solution for 8 hours, the mixture is centrifuged at a speed of 8000 r / min for 4 minutes...

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Abstract

The invention discloses a preparation method of WO3 / VO2 composite powder with thermochromic performance. The preparation method comprises the following steps: fully grinding vanadium pentoxide and ammonium tungstate according to a certain proportion to obtain mixed powder; carrying out reduction annealing treatment on the mixed powder and ammonium bicarbonate in vacuum to obtain WO3 / VO2 compositepowder; mixing the obtained powder, PVP (Polyvinyl Pyrrolidone) and ethanol, conducting ball milling, and conducting spin-coating to prepare a WO3 / VO2 composite film. A direct annealing reduction method is adopted, the preparation process is simple, the preparation efficiency is high, the requirement for equipment is low, and the method is suitable for large-area industrial production; and the prepared composite powder has thermochromic performance and shows relatively low phase change temperature.

Description

technical field [0001] The invention relates to the technical field of inorganic materials, in particular to a WO with thermochromic properties 3 / VO 2 Composite powder and its preparation method. Background technique [0002] Vanadium dioxide (VO 2 ) is a thermochromic material, its crystal structure will change from tetragonal rutile to monoclinic structure around 68°C, and various physical and chemical properties will change greatly. With the change of the crystal structure, the optical refractive index, transmittance and reflectance will change abruptly, especially in the infrared and near-infrared bands. The transmittance is relatively high; when the temperature rises above 68°C, the transmittance of visible light remains unchanged, and the transmittance in the near-infrared band decreases. The reversible phase transition of vanadium dioxide and the large change in optical properties before and after the phase transition make vanadium dioxide have a wide application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02C01G31/02
CPCC01G31/02C01G41/02C01P2002/72C01P2002/82C01P2002/88
Inventor 田守勤姚嘉钧李彬房兆达刘秋芬刘嘉辉吴森伟曾终乐
Owner WUHAN UNIV OF TECH
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