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A dynamic thermal infrared stealth composite material based on double phase transition and its preparation method

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

Active Publication Date: 2020-12-04
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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  • A dynamic thermal infrared stealth composite material based on double phase transition and its preparation method
  • A dynamic thermal infrared stealth composite material based on double phase transition and its preparation method
  • A dynamic thermal infrared stealth composite material based on double phase transition and its 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 condition of Example 1 (but change the mass ratio of stearic acid and mica after vanadium extraction to 4:6, prepare mica-based phase-change heat storage composite material, and obtain 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 is T B ...

Embodiment 3

[0036] According to the same method and condition of Example 1 (but change the mass ratio of stearic acid and mica after vanadium extraction to 5:5, prepare the mica-based phase-change heat storage composite material, and obtain the 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 a glass mold 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 plat...

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Abstract

The invention discloses a dynamic thermal infrared stealth composite material and a preparation method based on double phase transition; especially a VO 2 / Mica-based phase change heat storage thin-layer composite material and preparation method; belongs to the technical field of thermal infrared stealth material preparation; the VO 2 / Mica-based phase change heat storage thin-layer composite material is made of VO 2 The nanoparticle coating is composed of a mica-based phase-change heat storage thin layer, and the mica-based phase-change heat storage thin layer is composed of stearic acid and a vanadium-extracted mica matrix in a mass ratio of 3-5:5-7. The present invention adopts roasting acid leaching process to extract vanadium from vanadium mica and prepare VO 2 Nanoparticles, the mica after vanadium extraction is used as the support matrix to embed the phase change functional body to prepare the mica-based phase-change heat storage thin layer, and the mica-based phase-change heat storage thin layer is coated with VO 2 Nanoparticles, made double phase change composite material. The dynamic thermal infrared stealth composite material based on the double phase transition of the present invention can realize synergistic enhancement of thermal infrared stealth performance, and can be applied to thermal infrared stealth 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 Patents(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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