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Preparation method for thermally-induced infrared-emission-rate-variable vanadium dioxide thin sheet

A technology of infrared emissivity and vanadium dioxide, which is applied in the field of inorganic functional materials, can solve the problems of small sudden change value of coating emissivity, influence infrared emissivity, affect performance and other problems, achieve small infrared emissivity, reduce preparation time, The effect of reducing reflectivity

Active Publication Date: 2016-06-15
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the application of vanadium dioxide powder in the prior art is mainly through making it into a coating. However, resins, diluents and additives need to be added to make a coating, which affects the change of its infrared emissivity, thereby affecting Its performance, Liu Dongqing et al. (see Liu Dongqing, Zheng Wenwei, Cheng Haifeng, Liu Haitao, Du Panpan. Thermally induced emissivity VO 2 Coating research and application [J]. New technology and new technology, 2008 (11): 117-119) will VO 2 Powder prepared by VO 2 coating, VO 2 The emissivity of the coating has a sudden change near the phase transition point of 68°C, and the mutation amount is 0.1, but the emissivity mutation value of the coating is still small, which limits its application

Method used

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  • Preparation method for thermally-induced infrared-emission-rate-variable vanadium dioxide thin sheet
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  • Preparation method for thermally-induced infrared-emission-rate-variable vanadium dioxide thin sheet

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Embodiment 1

[0033] A preparation method of the vanadium dioxide thin sheet with thermally variable infrared emissivity of the present invention, comprising the following steps:

[0034] (1) Add 1.76g (0.015mol) of ammonium metavanadate and 1.58g (0.0082mol) of citric acid into 70ml of deionized water for magnetic stirring and mixing to form a homogeneous solution for 30 minutes; then the obtained solution Transfer to a 100ml hydrothermal kettle and react at 245°C for 16h;

[0035] (2) After the reaction is completed, the product is taken out after the hydrothermal kettle is naturally cooled, and the obtained product is first centrifuged, and then the product obtained after the centrifugation is alternately washed three times with deionized water and absolute ethanol, and finally heated at 60°C Carry out vacuum drying, drying time is 12h, obtains VO 2 Powder;

[0036] (3) Take 0.6g of VO obtained in step (2) 2 The powder is pressed into a sheet with a diameter of 20mm (referred to as a ...

Embodiment 2

[0041] A preparation method of the vanadium dioxide thin sheet with thermally variable infrared emissivity of the present invention, comprising the following steps:

[0042] (1) Add 1.76g (0.015mol) of ammonium metavanadate and 1.58g (0.0082mol) of citric acid into 70ml of deionized water for magnetic stirring and mixing to form a homogeneous solution for 30 minutes; then the obtained solution Transfer to a 100ml hydrothermal kettle and react at 285°C for 8h;

[0043] (2) After the reaction is completed, take out the product after the hydrothermal kettle cools down naturally, centrifuge the obtained product first, then wash the product obtained after the centrifugation with deionized water and absolute ethanol alternately three times, and finally put it under 80°C Carry out vacuum drying, drying time is 10h, obtains VO 2 Powder;

[0044] (3) Take 0.6g of VO obtained in step (2) 2 The powder is pressed into a sheet with a diameter of 20 mm by a tablet press under a pressure ...

Embodiment 3

[0047] A preparation method of the vanadium dioxide thin sheet with thermally variable infrared emissivity of the present invention, comprising the following steps:

[0048] (1) Add 2.07g (0.015mol) of potassium metavanadate and 3.15g (0.0164mol) of citric acid into 60ml of deionized water for magnetic stirring and mixing to form a uniform solution for 30 minutes; then the obtained solution Transfer to a 100ml hydrothermal kettle and react at 285°C for 12h;

[0049] (2) After the reaction is completed, the product is taken out after the hydrothermal kettle is naturally cooled, and the obtained product is first centrifuged, and then the product obtained after the centrifugation is alternately washed three times with deionized water and absolute ethanol, and finally heated at 70°C Carry out vacuum drying, drying time is 11h, obtains VO 2 Powder;

[0050] (3) Take 0.8g of VO obtained in step (2) 2 The powder is pressed into a sheet with a diameter of 20 mm by a tablet press un...

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Abstract

The invention discloses a preparation method for a thermally-induced infrared-emission-rate-variable vanadium dioxide thin sheet. The method includes the steps of: (A) with metavanadate, citric acid and deionized water as initial raw materials, stirring and mixing the raw materials uniformly according to certain ratio, and moving the mixture into a hydrothermal kettle to perform a hydrothermal reaction; and (B) when the reaction is finished, performing centrifugation, washing and vacuum drying to obtain nano vanadium dioxide powder, pressing the powder into thin sheets, and annealing the thin sheets to prepare the thermally-induced infrared-emission-rate-variable vanadium dioxide thin sheet. The preparation method is simple. The raw materials are toxic-free and low-cost. The product has good crystallinity. The vanadium dioxide thin sheet achieves intensive change in infrared emission rate at about room temperature with abrupt change value reaching 0.34. The thin sheet has high mechanical strength, is not liable to break, is convenient to mechanically process, can be processed into different sizes and pasted to required positions in practical utilization, is convenient to use and has wide application prospect in the fields of infrared stealth and military camouflage.

Description

technical field [0001] The invention belongs to the field of inorganic functional materials, and relates to a preparation method of a thermally variable infrared emissivity material, in particular to a preparation method of a thermally variable infrared emissivity vanadium dioxide sheet. Background technique [0002] Thermochromic infrared emissivity material is a kind of intelligent material, its own infrared emissivity can be adjusted independently according to the change of ambient temperature, and it has a wide range of applications in the fields of military camouflage and thermal control. In the field of military camouflage, with the continuous improvement of reconnaissance level and multi-band data acquisition, fusion and processing speed, the fixed signal feature matching technology of traditional camouflage equipment is facing great challenges. If the infrared characteristics of camouflage equipment are fixed, when the outside world When the environment changes, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495
CPCC04B35/495C04B2235/658
Inventor 嵇海宁刘东青程海峰张朝阳郑文伟
Owner NAT UNIV OF DEFENSE TECH
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