Ferrite-Coated Magnetic Composite for High-Frequency Loss Reduction
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Solution Overview
Problem
Conventional ferrite-based electromagnetic wave absorbers and inductors face limitations in magnetic properties, film thickness, adhesion, and electrical insulation due to the presence of nonmagnetic materials or conductive metals, making them unsuitable for high-frequency applications.
Innovation Solution
A magnetic composite comprising a non-metallic inorganic base material with a spinel-type ferrite layer, having specific thickness and composition, including controlled crystalline state and density, to enhance heat resistance, adhesion, and reduce magnetic loss at high frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferrite powder and binder resin are used to form an electromagnetic wave absorber, then electromagnetic wave absorption performance is improved, but magnetic properties deteriorate due to the presence of nonmagnetic binder resin
Solution Approach 1:
The invention extracts and removes the binder resin component from the composite material. By forming a ferrite layer directly on the substrate without using binder resin, the patent eliminates the nonmagnetic material that degrades magnetic properties while maintaining electromagnetic wave absorption performance through the ferrite layer's inherent properties
Solution Approach 2:
The invention creates a composite structure consisting of a substrate and a ferrite layer formed thereon. This composite material approach allows combining the substrate's mechanical support function with the ferrite layer's magnetic and electromagnetic wave absorption functions, achieving both good magnetic properties and absorption performance
2Reliability
If physical vapor deposition is used to form a ferrite film, then electromagnetic wave absorption properties are improved, but film thickness is limited and adhesion deteriorates
Solution Approach 1:
The invention replaces the physical vapor deposition process with a different film formation method that enables thicker film deposition. By using an alternative approach (such as aerosol deposition or other coating methods), the patent overcomes the thickness limitation inherent in physical vapor deposition while maintaining good electromagnetic wave absorption properties
Solution Approach 2:
The invention changes the film formation parameters and process conditions to enable thicker ferrite layer deposition. By adjusting deposition parameters, temperature, and process conditions, the patent achieves film thickness beyond the conventional limits of physical vapor deposition
3Stability of the object's composition
If conductive metal magnetic material is used in composite magnetic film, then magnetic properties are improved, but electrical insulation deteriorates
Solution Approach 1:
The invention extracts and removes the conductive metal magnetic material from the composite. By using ferrite as the sole magnetic material without conductive metal components, the patent eliminates the electrical conduction pathway while maintaining magnetic properties through ferrite's inherent magnetic characteristics
Solution Approach 2:
The invention uses ferrite material that provides both magnetic properties and electrical insulation locally within the layer. The ferrite layer simultaneously delivers the required magnetic performance and electrical insulation properties, eliminating the need to balance between conductive metal and insulating materials
4Reliability
If ferrite layer thickness is increased to improve high-frequency magnetic loss reduction, then adhesion deteriorates due to film stress
Solution Approach 1:
The invention changes the deposition parameters, temperature conditions, and process controls to enable formation of thicker ferrite layers with reduced internal stress. By optimizing these parameters, the patent achieves both increased film thickness for better high-frequency performance and maintained adhesion through controlled stress development
Solution Approach 2:
The invention creates a composite structure where the ferrite layer is properly bonded to the substrate through controlled interface formation. By managing the interface properties and using appropriate substrate preparation and deposition conditions, the patent achieves strong adhesion even with thicker ferrite layers
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 achieves excellent heat resistance, dense film thickness, and improved adhesion with reduced magnetic loss at high frequencies, suitable for applications requiring electrical insulation.
Implementation Method 1
a material exhibiting magnetic loss is used. As a material exhibiting magnetic loss, ferrite having high permeability and high electrical resistance is frequently used. The ferrite causes a resonance phenomenon at a specific frequency to absorb an electromagnetic wave, converts absorbed electromagnetic wave energy into thermal energy
Implementation Method 2
The ferrite causes a resonance phenomenon at a specific frequency to absorb an electromagnetic wave
Data Source
AI summary
A magnetic composite includes: a non-metallic inorganic base material; and a ferrite layer provided on a surface of the non-metallic inorganic base material, and the non-metallic inorganic base material has a thickness of 2.0 μm or more, the ferrite layer has a thickness (dF) of 2.0 μm or more and 50.0 μm or less, and contains spinel-type ferrite as a principal component, and a content of α-Fe2O3 in the ferrite layer is 3.0 mass % or more and 25.0 mass % or less.