VO2/Mica Phase Change Stealth Material for Thermal Infrared Response
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Solution Overview
Problem
Current thermal infrared stealth materials face challenges in rapidly responding to excessive thermal radiation due to high infrared radiation loads, and mineral-based composite phase change materials struggle to achieve excellent thermal infrared stealth performance.
Innovation Solution
A dynamic thermal infrared stealth composite material is developed using a VO2/mica-based phase change thermal storage thin layer composite, comprising a VO2 nanoparticle coating and a mica-based phase change thermal storage thin layer with a specific mass ratio, which synergistically regulates infrared emissivity and temperature for active and rapid response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If VO2 is used as thermal infrared stealth material, then reversible phase change and fast thermally induced response are achieved, but infrared radiation load increases when thermal radiation from target is excessively large
Solution Approach 1:
The patent combines VO2 phase change material with stearic acid phase change material and mica substrate to create a composite thermal infrared stealth material. This composite structure allows the VO2 to provide fast thermally induced response while the stearic acid-mica composite absorbs excess thermal radiation through phase change, thereby reducing the infrared radiation load on VO2 and enabling rapid response even under high radiation conditions.
2Ease of manufacture
If mineral-based composite phase change materials are used for temperature control, then cost-effective preparation is achieved, but excellent thermal infrared stealth performance cannot be realized
Solution Approach 1:
The patent merges the advantages of mineral-based composite phase change materials (cost-effective, good temperature control) with VO2 phase change material (excellent thermal infrared stealth performance, fast response). The combination integrates the low-cost mica substrate with high-performance VO2, achieving both economical preparation and superior thermal infrared stealth performance through synergistic effects.
3Adaptability or versatility
If VO2 nanoparticle coating is applied on mica-based phase change thermal storage thin layer, then simultaneous regulation of infrared emissivity and temperature is achieved, but material structure complexity increases
Solution Approach 1:
The patent applies VO2 nanoparticles specifically as a coating layer on the mica-based phase change thermal storage thin layer, creating a layered structure with distinct local functions. The VO2 coating layer provides infrared emissivity regulation and fast thermal response, while the underlying stearic acid-mica composite provides temperature control and thermal storage. This localized functional differentiation achieves simultaneous regulation of infrared emissivity and temperature while maintaining a relatively simple layered structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composite material effectively reduces radiation load, enhances temperature control, and improves thermal infrared stealth performance by simultaneously controlling infrared emissivity and temperature, overcoming the limitations of VO2 and stearic acid-based materials.
Implementation Method 1
VO2 is an inorganic phase change material with a typical characteristic of thermally induced emissivity changes. At a phase change temperature (Tc=68℃), it is subject to a reversible phase change from a semiconductor phase (M phase) having a monoclinic structure with high infrared emissivity at low temperature to a metal phase (R phase) having a rutile structure with low infrared emissivity at high temperature.
Implementation Method 2
VO2 has the advantages of reversible phase change, adjustable phase change temperature, and fast thermally induced response, and also has the function of temperature control by means of the latent heat of phase change
Implementation Method 3
the mica-based phase change thermal storage thin layer consists of stearic acid and a vanadium-extracted mica substrate
Implementation Method 4
VO2 has high infrared emissivity at low temperature to a metal phase (R phase) having a rutile structure with low infrared emissivity at high temperature
Implementation Method 5
A dynamic thermal infrared stealth composite material based on dual phase change... VO2/mica-based phase change thermal storage thin layer composite material... synergistically regulate and control infrared emissivity and temperature
Data Source
AI summary
A dynamic thermal infrared stealth composite material based on dual phase change is a VO2/mica-based phase change thermal storage thin layer composite material composed of a VO2 nanoparticle coating and a mica-based phase change thermal storage thin layer, wherein the mica-based phase change thermal storage thin layer consists of stearic acid and a vanadium-extracted mica substrate in a mass ratio of 3-5:5-7. The composite material based on dual phase change is prepared by extracting vanadium from vanadium mica using a roasting and acid leaching process to prepare VO2 nanoparticles and a vanadium-extracted mica, embedding a phase change functional body into the vanadium-extracted mica as a support substrate to prepare a mica-based phase change thermal storage thin layer, and coating the VO2 nanoparticles on the mica-based phase change thermal storage thin layer. The dynamic thermal infrared stealth composite material can synergistically reinforce thermal infrared stealth performance.