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Dynamic thermal infrared invisible composite material based on dual phase change and preparation method

A composite material, thermal infrared technology, applied in heat exchange materials, chemical instruments and methods, offensive equipment, etc., can solve the problems of increased infrared radiation load, inability to quickly respond to background infrared radiation, etc., to reduce radiation load and respond. Effect of temperature change, overcoming phase change leakage

Active Publication Date: 2019-01-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the target thermal radiation is too large, VO 2 Increased IR radiation load, unable to respond quickly to background IR radiation levels

Method used

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  • Dynamic thermal infrared invisible composite material based on dual phase change and preparation method
  • Dynamic thermal infrared invisible composite material based on dual phase change and preparation method
  • Dynamic thermal infrared invisible composite material based on dual phase change and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The first step is to take 1kg of vanadium mica raw ore and crush it to mm-level particle size by ball milling, then microwave roasting at 850°C for 1 hour; use sulfuric acid as the leaching solution and mix and stir the roasted clinker at a liquid-solid ratio of 2:1ml / g , leaching reaction at a leaching temperature of 95°C and a leaching time of 12 hours to obtain a vanadium-containing leaching solution. After vanadium extraction, the mica is washed, dried, and set aside; adjust the pH of the leach solution to acidity 2.0, add sodium chlorate to oxidize, and saturate the resin for adsorption, desorption and purification, add ammonium salt to precipitate to form ammonium metavanadate, filter, wash, and dry; Ammonium vanadate was used as the reaction raw material, and 0.8ml / L oxalic acid reducing agent solution was added dropwise to ammonium metavanadate, and after stirring for 10 minutes, the hydrothermal reaction was carried out at a reaction temperature of 180°C for 12 ...

Embodiment 2

[0034] According to the same method and conditions of Example 1 (but changing the mass ratio of stearic acid to mica after vanadium extraction is 4:6, preparing mica-based phase-change heat storage composite material, and obtaining mica-based phase-change heat storage thin layer), in the same Spin coating VO under spin coating times 2 Nanoparticles, finally obtained to prepare VO 2 / mica-based phase change heat storage thin-layer composite material, denoted as sample 2. Its infrared stealth performance is tested by the infrared camera FlukeThermography TiS50. According to the infrared stealth evaluation standard, the test method is as follows: put the obtained dual phase change material (sample 2) and the pure phase change material (sample 0) in comparative example 1 into glass molds and put them on a rectangular heating plate at 68-73°C. After a period of time, ,Such as figure 2 As shown in the grayscale image of the infrared thermal image, the temperature of the plate i...

Embodiment 3

[0036] According to the same method and conditions of Example 1 (but changing the mass ratio of stearic acid to mica after vanadium extraction is 5:5, preparing mica-based phase-change heat storage composite material, and obtaining mica-based phase-change heat storage thin layer), in the same Spin coating VO under spin coating times 2 Nanoparticles, finally obtained to prepare VO 2 / mica-based phase change heat storage thin-layer composite material, denoted as sample 3. Its infrared stealth performance is tested by the infrared camera FlukeThermography TiS50. According to the infrared stealth evaluation standard, the test method is as follows: put the obtained double phase change material (sample 3) and the pure phase change material (sample 0) in comparative example 1 into glass molds and put them on a rectangular heating plate at 68-73°C. After a period of time, ,Such as image 3 As shown in the grayscale image of the infrared thermal image, the temperature of the plate ...

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Abstract

The invention discloses a dynamic thermal infrared invisible composite material based on dual phase change and a preparation method and especially relates to a VO2 / mica based phase change heat-accumulation thin layer composite material and a preparation method, and belongs to the technical field of preparation of infrared invisible materials. The VO2 / mica based phase change heat-accumulation thinlayer composite material is composed of a VO2 nanoparticle coating and a mica based phase change heat-accumulation thin layer, wherein the mica based phase change heat-accumulation thin layer is composed of stearic acid and a vanadium-extracted mica matrix according to the mass ratio of (3 to 5) to (5 to 7). The preparation method comprises the following step: preparing VO2 nanoparticles from vanadium-extracted mica by adopting a roasting and acid leaching technology; taking the vanadium-extracted mica as a supporting matrix and embedding to a phase change functional body to prepare the mica based phase change heat-accumulation thin layer; and coating the mica based phase change heat-accumulation thin layer with the VO2 nanoparticles to obtain a dual phase change composite material. The dynamic thermal infrared invisible composite material based on the dual phase change, provided by the invention, can be used for cooperatively strengthening the thermal infrared invisible performance and can be applied to a thermal infrared invisible technology.

Description

technical field [0001] The invention discloses a dynamic thermal infrared stealth composite material and a preparation method based on double phase transition; especially a VO 2 / The invention discloses a mica-based phase-change thermal storage thin-layer composite material and a preparation method; it belongs to the technical field of preparation of thermal infrared stealth materials. Background technique [0002] With the rapid development of modern military reconnaissance technology, the survival security of military targets is facing increasingly serious threats. As a means of anti-reconnaissance, infrared stealth technology can improve the survivability and combat effectiveness of military targets, and has always been valued by major military powers. Thermal infrared stealth materials have qualified infrared emissivity and efficient temperature control ability, which is an important way to realize infrared stealth technology. [0003] Vanadium dioxide (VO 2 ) is an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063F41H3/00B05D1/005B05D3/007
Inventor 李传常谢宝珊陈荐
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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