Improving the absorption performance of soft magnetic materials has always been a research focus. Due to the dilemma of using a single soft magnetic material,
Soft magnetic composite materialsBecoming a popular research direction for solving this problem. This article will focus on introducing composite forms such as heterojunction and core-shell structure based on FeSiAl alloy, as well as the research progress of soft magnetic alloy and carbon material composites, and deeply analyze the influencing factors of their absorption performance.
1、 Research progress on FeSiAl/ferrite and FeSiAl/graphite heterostructures
1.1 Impedance matching performance optimized by heterostructure implementation
FeSiAl alloy exhibits high loss characteristics and is suitable for use as an absorbing layer. By encapsulating or coating other materials (such as ferrite, graphite, etc.) on FeSiAl alloy to form heterostructures, the impedance matching performance can be significantly improved. for example
FeSiAl/ferriteHeterojunction structure, ferrite layer achieves impedance matching with free space with its relatively low loss and appropriate dielectric constant. This optimized impedance matching can improve the absorption effect.
1.2 The regulatory effect of interface polarization on magnetic permeability
In addition to optimizing impedance matching performance, interface polarization also plays an important role in regulating magnetic permeability. By adjusting the thickness of the matching layer between FeSiAl alloy and the coating or coating material, the interface polarization effect can be improved, further enhancing the magnetic permeability of soft magnetic composite materials. Therefore, rational design of interface structure and adjustment of matching layer thickness are key to achieving high magnetic permeability.
II FeSiAl@Al2O3 @Research progress on SiO2 core-shell structure
2.1 Optimized impedance matching performance and magnetic permeability of core-shell structure
The core-shell structure is another common form of soft magnetic composite material, which forms a multi-layer coating structure on the surface of FeSiAl alloy, such as FeSiAl@Al2O3 @SiO2. The outer layer material of this structure serves as a matching layer, which can optimize the impedance matching performance and improve the absorption effect. Meanwhile, the presence of core-shell structure can also improve the interface polarization effect, thereby increasing the magnetic permeability of soft magnetic composite materials.
2.2 Preparation methods and advantages of core-shell structures
The methods of preparing core-shell structure generally include sol gel method, liquid deposition method, etc. These methods can achieve self-assembly and self-organization of materials, obtaining core-shell structures with excellent performance. Compared to other composite forms, core-shell structures have better stability and higher absorption performance, providing new ideas for the research of soft magnetic composite materials.
3、 Research progress on composite of soft magnetic alloys and carbon materials
In addition to FeSiAl alloy, the composite of soft magnetic alloys and carbon materials has also become
Absorbing materialResearch hotspots. Soft magnetic alloys have high light wave absorption capacity and magnetic permeability, while carbon materials have excellent electromagnetic wave absorption performance. By combining soft magnetic alloys with carbon materials, the advantages of both materials can be fully utilized to form a synergistic effect and improve the absorption performance.
Conclusion: Soft magnetic composite materials can achieve optimized impedance matching performance and magnetic permeability by constructing heterojunctions, core-shell structures, and composite of soft magnetic alloys and carbon materials, thereby significantly improving absorption performance. In future research, we can further explore new composite methods and new materials to broaden the application of soft magnetic composite materials in a wider range of fields.
