Dense AlN/FeSiAl composite ceramics with high thermal conductivity and strong microwave absorption

Enhanced mechanical and wave‐absorption properties of SiC–Si3N4–FeSi porous ceramics by introducing Al

“…This indicates that the input impedance of porous ceramic surface is consistent with the material characteristics impedance, and the RL curve reaches a minimum value under this condition. Figure 7B shows the comparison of the absorption performance of SiC–Si 3 N 4 –FeAl 0.25 Si 0.75 porous ceramics (S3) produced in this work with other similar materials 12,13,21,38–47 . Figure 7C further compares the RL value per unit thickness ($${\mathrm{RL}}_{{\mathrm{min}}}/d$$).…”

“…Figure 7B shows the comparison of the absorption performance of SiC-Si 3 N 4 -FeAl 0.25 Si 0.75 porous ceramics (S3) produced in this work with other similar materials. 12,13,21,[38][39][40][41][42][43][44][45][46][47] Figure 7C further compares the RL value per unit thickness (RL min ∕𝑑). SiC-Si 3 N 4 -FeAl 0.25 Si 0.75 porous ceramics can achieve stronger electromagnetic wave-absorption performance at lower thicknesses compared to materials reported in comparative literature, showing the potential for application as high-performance absorbing materials.…”

“…Due to their high density, high magnetic permeability, and large electromagnetic parameters, these materials are mostly applied in the form of coatings in the lower frequency range (MHz band). Soft magnetic materials such as iron silicon intermetallic compounds have both ceramic and metallic properties, good conductivity, high Curie temperature, and high saturation magnetization 21 . Compared to ferromagnetic materials, they have lower magnetic permeability and smaller electromagnetic parameters, making them a promising magnetic absorber for use in higher frequency ranges (GHz band).…”

“…Soft magnetic materials such as iron silicon intermetallic compounds have both ceramic and metallic properties, good conductivity, high Curie temperature, and high saturation magnetization. 21 Compared to ferromagnetic materials, they have lower magnetic permeability and smaller electromagnetic parameters, making them a promising magnetic absorber for use in higher frequency ranges (GHz band).…”

Multifunctional Composite Material with Efficient Microwave Absorption and Ultra-High Thermal Conductivity

“…Specifically, Zhang et al [11] used carbon fibers to establish microscopic thermal conduction pathways, making the thermal conductivity of the material as high as 15.55 W•m −1 •K −1 , which is the polymer-based HC-EMWAMs with the highest thermal conductivity reported in the literature. Subsequently, some researchers replaced the polymer substrate by materials with high thermal conductivity [13][14][15][16][17][18][19][20][21][22] and then added lossy filler to prepare ceramics with high thermal conductivity and strong microwave absorption. These approaches have the potential to enhance mechanical properties, wave absorption, and superhigh thermal conductivity of materials, most of them are greater than 70 W•m −1 •K −1 .…”