Amorphous Metallic Microwire Paint for Electromagnetic Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromagnetic radiation absorbers often require high mass fractions and are not suitable for thin layer structures, failing to effectively attenuate reflectivity across a wide frequency range while avoiding reflection.
Innovation Solution
A process integrating amorphous metallic microwires into a paint with controlled dielectric constants and microwire dimensions, applied in multiple coats to achieve specific attenuation frequencies, using a solvent in limited amounts and mixing at controlled speeds to prevent microwire breakage, allowing for thin layer absorption without excessive mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high mass fraction of conductive particles is used to achieve electromagnetic radiation shielding, then shielding effectiveness is improved, but layer thickness and mass increase making it unsuitable for thin layer structures
Solution Approach 1:
The patent changes the physical parameters of the conductive elements by using amorphous metallic microwires with specific length (0.1-20mm) and diameter (3-15 microns) ratios, along with controlled dielectric constant (2-1000) and solvent content (0-20%), to achieve effective electromagnetic radiation attenuation in thin layers without requiring high mass fractions
Solution Approach 2:
The patent creates a composite paint material combining amorphous metallic micrawires with a dielectric matrix, where the specific composition ratio and properties of each component work together to achieve both thin layer applicability and effective electromagnetic radiation absorption
2Ease of manufacture
If conventional paint mixing methods are used to integrate metallic micrawires, then mixing simplicity is improved, but micrawire breakage increases reducing absorption effectiveness
Solution Approach 1:
The patent specifies controlled mixing parameters including maximum speed depending on micrawire length and beating time limits to prevent micrawire breakage while achieving adequate dispersion in the paint matrix
Solution Approach 2:
The patent uses a dielectric matrix as an intermediary medium that protects the amorphous metallic micrawires during the mixing and application process, reducing direct mechanical stress and breakage while maintaining dispersion
3Ease of operation
If paint is applied without controlled dielectric constant and solvent content, then application simplicity is improved, but attenuation frequency precision deteriorates
Solution Approach 1:
The patent establishes specific parameter ranges for dielectric constant (2-1000) and solvent content (0-20%) that can be adjusted to control the maximum attenuation frequency while maintaining ease of application through standard painting processes
4Reliability
If metallic micrawires are oriented perpendicular to the surface, then absorption effectiveness is improved, but surface uniformity deteriorates
Solution Approach 1:
The patent removes (sands) the micrawires that have oriented perpendicular to the surface after the paint has dried, eliminating the surface uniformity problem while retaining the beneficial perpendicular orientation effect on absorption for the micrawires that remain properly embedded
Solution Approach 2:
The patent discards the improperly oriented micrawires through sanding, removing only the excess perpendicular micrawires that cause surface non-uniformity while preserving the functional micrawire network within the paint layer
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 solution achieves significant attenuation of electromagnetic radiation reflectivity across a wide frequency range, with specific examples showing attenuation levels of 18 dB at 5.3 GHz and -18 dB at 9 GHz, demonstrating effective absorption without excessive mass or reflection.
Implementation Method 1
amorphous magnetic microwires with high magnetic anisotropy having magnetic resonance properties are randomly distributed
Implementation Method 2
paint with metallic micrawires for attenuating the reflectivity of electromagnetic radiation
Implementation Method 3
The maximum attenuation frequency of the reflectivity of electromagnetic radiation having a range which is determined by the length l and the diameter dc of the metallic core of the amorphous metallic micrawires, by the proportion of amorphous metallic micrawires in the paint, and by the dielectric constant of the paint
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention relates to a paint with metallic microwires, to the process for integrating metallic microwires to obtain such paint, and to a process for applying said paint on metallic surfaces (1). The process for applying paint is performed in several steps: - applying a first coat (2) of primer on the metallic surface; - applying on the first coat (2) a second coat (3, 3') of paint; - applying on said second coat (3) an active third coat (4) of a paint containing microwires; and - sanding said active third coat (4) with fine grain sandpaper to remove the microwires oriented perpendicular to the plane of the metallic surface; the maximum attenuation frequency of the reflectivity of said electromagnetic radiation being determined within of the range of maximum attenuation frequencies given by the composition of the paint with microwires, and by the thicknesses and dielectric constants of the different coats.