Development of microwave absorbing materials for high-temperature applications
https://doi.org/10.29235/1561-8358-2026-71-3-183-197
Abstract
The possibility of creating microwave absorbing materials for high-temperature applications by alloying a dielectric matrix based on alumina or Al2O3/TiO2 composite with resistive materials based on titanium Ti–Si–C and Ti–Al–C, heat-resistant iron-based alloys in the FeCrNiAl and FeSiAlTi systems, and the intermetallic compound TiAl with a filler content of 10–60 wt.% is demonstrated. The resistive materials and the intermetallic compound were synthesized by Mechanically Activated Self-propagating High-temperature Synthesis. The heat-resistant alloys were obtained by gas atomization of the initial components mixture. Alloying was performed in a planetary ball mill. The main reflections of the Al2O3/Ti–Al–C and Al2O3/Ti–Si–C compositions were identified by the lines of α–Al2O3, MAX-phases Ti3AlC2, Ti2AlC and Ti3SiC2, respectively. The Al2O3/TiO2/TiAl composition contained α–Al2O3, TiO2 and Ti3Al. In the composites alloyed with heat-resistant alloys, in addition to the α–Al2O3 content, the lines of the iron-based solid solution Cr0.03Fe0.97 for Al2O3/FeCrNiAl, as well as the lines of α–Fe, α–Fe2O3, TiAl and slightly Fe2SiO4 for Al2O3/FeSiTiAl were found. The main parameter of the particle size distribution was d50 = 0.14–36.5 μm. The obtained Al2O3-based MAMs with conductive and magnetic fillers in the 8–12 GHz range exhibit a concentration-driven increase of ε′ ≈ 5.6–25.0 and ε″ ≈ 0.5–7.9 as the filler content rises to 50–60 wt.%, reaching maximum losses of tgδε = 0.38–0.55 and tgδμ = 0.69–0.80 for magnetic Al2O3/FeSiTiAl composites at 50 wt.% filler. At ~35–40 wt.% filler content a percolation-type loss enhancement is observed, accompanied by an increased contribution of ohmic losses. The developed composite materials are recommended for use as radar-absorbing coatings applied by plasma and gas flame spraying on equipment components operating at temperatures up to 1000 °C.
Keywords
dielectric matrix,
resistive materials,
heat-resistant alloys,
intermetallic compound,
microwave absorbing materials
Supporting agencies: the work was performed within the framework of Assignment 5.4.05 “Development and study of composite ceramic erosion-resistant high-temperature microwave absorbing materials and coatings for operation in the microwave frequency range” and Assignment 5.4.12 “Synthesis of alloyed ceramic microwave absorbing materials of the microwave range and development of a process for obtaining microwave absorbing coatings on their basis by the gas-thermal spraying method” of the State Scientific Research Program “Physical Materials Science, New Materials and Technologies” for 2016–2020, Subprogram “Composite Materials”.
About the Authors
A. Ph. Ilyushchanka
O. V. Roman Powder Metallurgy Institute of the National Academy of Sciences of Belarus
Belarus
Belarus
Aliaksandr Ph. Ilyushchanka – Dr. Sci. (Engineering), Professor, Academician of the National Academy of Sciences of Belarus, Director General at State Research and Production Powder Metallurgy Association of the National Academy of Sciences of Belarus – Director
41, Platonov St., 220005, Minsk
S. G. Barai
O. V. Roman Powder Metallurgy Institute of the National Academy of Sciences of Belarus
Belarus
Belarus
Sergey G. Baray – Cand. Sci. (Engineering), Associate Professor, Head of the Ceramic Group
41, Platonov St., 220005, Minsk
A. I. Letsko
O. V. Roman Powder Metallurgy Institute of the National Academy of Sciences of Belarus
Belarus
Belarus
Andrey I. Letsko – Cand. Sci. (Engineering), Associate Professor, Deputy Director
41, Platonov St., 220005, Minsk
N. V. Nasonova
Belarussian State University of Informatics and Radioelectronics
Belarus
Belarus
Natalia V. Nasonova – Dr. Sci. (Engineering), Associate Professor, Senior Researcher of Research Laboratory “Materials and Elements of Electronic and Superconducting Technology”
6, P. Brovka St., 220013, Minsk
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