Fe-Cr-Co Electromagnetic Absorber for Thin High-Frequency Shielding
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Solution Overview
Problem
Existing electromagnetic absorbers are ineffective in absorbing high-frequency electromagnetic waves due to frequency dependence and size constraints, particularly in the context of increasingly compact electronic devices.
Innovation Solution
An electromagnetic absorber comprising a polymer base material with an Fe—Cr—Co-based alloy powder having a two-phase separation structure, where the first phase is elongated or flattened, and the powder is processed to achieve an average aspect ratio of 3 to 50, enhancing high-frequency absorption capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the electromagnetic absorber is increased to improve high-frequency absorption capability, then the electromagnetic wave absorption capability increases, but the device size increases which is incompatible with compact electronic devices
Solution Approach 1:
The invention changes the microstructural parameters of the alloy powder by creating a two-phase separation structure with specific composition ratios (first phase: 60-90 atom% Fe, 10-40 atom% Co; second phase: 30-70 atom% Fe, 30-70 atom% Co). This parameter optimization enables high-frequency absorption capability while maintaining thin thickness
Solution Approach 2:
The invention uses a composite alloy structure with two distinct phases separated by spinodal decomposition. The first phase (Fe-rich) and second phase (Co-rich) work synergistically to provide both high-frequency absorption capability and magnetic properties, allowing thin-film application
2Reliability
If conventional electromagnetic absorber materials are used to achieve high-frequency absorption, then the absorption capability may be sufficient, but the magnetic properties deteriorate
Solution Approach 1:
The invention applies local quality by creating regions with different compositions within the alloy powder. The first phase (Fe-rich) provides magnetic properties while the second phase (Co-rich) enhances high-frequency absorption. Each phase has optimized local composition to fulfill specific functional requirements
Solution Approach 2:
The two-phase composite structure combines materials with complementary properties. The Fe-rich phase contributes magnetic strength while the Co-rich phase improves high-frequency response, achieving both goals simultaneously through material composition design
3Reliability
If the alloy composition is optimized for high-frequency absorption, then the absorption capability improves, but the manufacturing complexity increases
Solution Approach 1:
The invention performs preliminary action by designing the alloy composition to spontaneously form the desired two-phase separation structure through spinodal decomposition during solidification or heat treatment. This pre-programmed microstructure formation eliminates the need for complex post-processing steps to create the phase structure
Solution Approach 2:
The invention controls the Cr content (10-30 atom%) as a key parameter that drives spinodal decomposition and forms the two-phase structure. By optimizing this single compositional parameter, the desired microstructure is achieved through a relatively simple manufacturing process
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 provides a high electromagnetic wave absorption characteristic in the high-frequency band, allowing for thinner absorber designs suitable for modern electronic devices, while maintaining effective magnetic properties.
Implementation Method 1
a two-phase separation structure including a first phase and a second phase, an Fe content and a Co content of the first phase are more than those of the second phase, and a Cr content of the second phase is more than that of the first phase, and the two-phase separation structure is a modulated structure
Implementation Method 2
The electromagnetic absorber has a function of absorbing unnecessary electromagnetic waves and converting them into heat
Data Source
AI summary
An electromagnetic absorber includes a base material formed of a polymer, and a powder dispersed in the base material. The powder is formed of an Fe—Cr—Co-based alloy having a two-phase separation structure including a first phase and a second phase. An Fe content and a Co content of the first phase are more than those of the second phase, and a Cr content of the second phase is more than that of the first phase. The two-phase separation structure is a modulated structure. Preferably, the first phase is elongated or flattened.