Mechanical, dielectric and microwave absorption properties of FeSiAl/Al2O3 composites fabricated by hot-pressed sintering

Complex permittivity of FeSiAl/Al2O3 ceramic composite at X-band frequencies

“…The values obtained by simulation in this work will be compared with the published experimental values. Table 1 shows that the values of the real and imaginary parts of the permittivity obtained in this work are very close to the experimental values published in the literature [1]. This means the existence of a good agreement between the results of the numerical simulation and the experimentally measured values.…”

“…In recent years, great importance has been given to the study of ceramic composite materials. Alumina matrix composites are among the materials that have attracted the attention of researchers [1,2,3,4].These materials have been used in many areas, especially in commercial, civil and military fields [5]. Due to the higher dielectric properties and excellent microwave absorption properties possessed by these materials, they have also been used in devices absorbing waves emitted by radars RAM [6], in electronic equipment, mobile communications [7], aircraft stealth technology and electromagnetic interference protection [8].…”

“…The high electrical conductivity of FeSiAl material and its high permittivity, as well as their good temperature stability [12,13] allowed its use in the reinforcement of ceramic composites for the improvement of microwave absorption properties [14], and for the design of electromagnetic wave absorbing materials. Recently, the dispersion of FeSiAl particles in the alumina matrix has resulted in the FeSiAl/Al2O3 composite, which has higher dielectric properties and excellent microwave absorption properties [1].…”

A review: 3D printing of microwave absorption ceramics

“…Cermet not only shows the characteristics of high strength, high hardness, wear resistance, high temperature resistance, oxidation resistance and chemical stability and plasticity, but also the promising and distinctive suitability to the application of microwave absorption materials. Taking advantage of the unique characteristics, FeSiAl/Al 2 O 3 composites was fabricated by hot‐pressed sintering, and the increase of interfacial polarization, relaxation loss, conductance loss and the permittivity in the X‐band were obtained with increase in FeSiAl content 12 . The composites with 5 wt% FeSiAl possesses the effective absorption bandwidth (<−10 dB) of 1.9 GHz in 9.1‐11.0 GHz, and the strong absorption peak of −34.2 dB is achieved at 9.4 GHz when the thickness is 1.9 mm, due to its appropriate impedance matching and electromagnetic wave attenuation.…”

High-efficiency and ultra-thin electromagnetic wave absorption xAl2O3–(1 − x)Sr0.85Gd0.15TiO3 ceramics in X-band

“…As described above, these advantages are mainly attributed to the high real part of permittivity, the relatively favorable imaginary part of permittivity, enhanced impedance matching characteristic and attenuation matching characteristic. As we all know, the effective microwave absorption performance should satisfy not only microwave attenuation but also impedance matching [49,50]. To achieve the perfect impedance matching, the impedance value of free space and absorbing material should be as equal as possible.…”