Characterization of electromagnetic wave absorbing properties of sic-based and alumina ceramic woven fabrics

Download
2008
Tan, Elvan
Electromagnetic wave absorbing properties of SiC-based and alumina ceramic woven fabrics have been investigated. Electrical conductivities of SiC-based ceramic woven fabrics were modified by heat treatment in air resulting in their oxidation. Surface properties of alumina woven fabrics were altered by gold-sputtering resulting in a high conductivity layer on the surface of the wovens. Electromagnetic wave interactions of single layer and double layered combinations of these ceramic woven fabrics were determined in 17-40 GHz frequency range using “free-space” method. Electromagnetic wave absorption potential of ceramic woven fabrics with different chemical compositions and woven types were correlated with their material properties by X-ray diffraction, scanning electron microscopy and electrical conductivity measurements. Effects of modifications and varying woven fabric arrangements in combinations on the electromagnetic wave absorption potential of the ceramic woven fabrics have been discussed. Various double layer combinations of SiC-based and alumina woven fabrics revealed a promising potential in terms of both reduced reflection and transmission resulting in more than ~95% absorption in millimeter wavelength range, which makes them powerful candidate materials for electromagnetic wave absorption applications.

Suggestions

Nano-scale phase separation and glass forming ability of iron-boron based metallic glasses
Aykol, Muratahan; Akdeniz, Mahmut Vedat; Department of Metallurgical and Materials Engineering (2008)
This study is pertinent to setting a connection between glass forming ability (GFA) and topology of Fe-B based metallic glasses by combining intimate investigations on spatial atomic arrangements conducted via solid computer simulations with experimentations on high GFA bulk metallic glasses. In order to construct a theoretical framework, the nano-scale phase separation encountered in metallic glasses is investigated for amorphous Fe80B20 and Fe83B17 alloys via Monte Carlo equilibration and reverse Monte Ca...
Microwave sintering and characterization of alumina and alumina matrix ceramic nanocomposites
Kayıplar, Burcu; Dericioğlu, Arcan Fehmi; Department of Metallurgical and Materials Engineering (2010)
Efficiency of microwave heating on the sintering of ceramic materials has been investigated in comparison to conventional processing. Monolithic alumina with or without sintering additives such as MgO, CaO, Y2O3 were fabricated by both conventional and microwave sintering at temperatures ranging from 1000°C to 1600°C with a constant soaking time of 1 hour. Based on the densification results on monolithic alumina, nanometer-sized SiC or stabilized ZrO2 particle-dispersed alumina matrix ceramic nanocomposites...
Electromagnetic wave absorption potential of SiC-based ceramic woven fabrics in the GHz range
Tan, E.; Kagawa, Y.; Dericioğlu, Arcan Fehmi (2009-03-01)
This article investigates the electromagnetic wave-absorbing properties of SiC-based ceramic woven fabrics. The electrical conductivity of ceramic woven fabrics was modified by heat treatment in air, resulting in oxidation, and the electromagnetic wave absorption potential of single- and double-layer ceramic woven fabrics were determined in the 17-40 GHz frequency range using the free-space method. The absorption potentials of ceramic woven fabrics of different chemical composition and weave were correlated...
Investigations on bulk glass forming ability of titanium based multicomponent alloys
Süer, Sıla; Mekhrabov, Amdulla O.; Department of Metallurgical and Materials Engineering (2008)
The aim of this study is to investigate the bulk glass forming ability (BGFA) of Ti-based alloy systems. These investigations were carried out in two main parts that are complementary to each other: theoretical and experimental. For theoretical studies, which are based on electronic theory of alloys in pseudopotential approximation, Ti-Zr, Ti-Co and Ti-Cu alloys were chosen as the binary systems. Alloying element additions were performed to each binary for the investigation of the BGFA of multicomponent Ti-...
Magnetic Susceptibility-Based Protein Detection Using Magnetic Levitation
Yaman, Sena; TEKİN, HÜSEYİN CUMHUR (American Chemical Society (ACS), 2020-09-01)
Magnetic levitation, which is a magnetic phenomenon of levitating particles suspended in a paramagnetic liquid under a nonuniform magnetic field, is a powerful tool for determining densities and magnetic properties of micro- and nanoparticles. The levitation height of particles in the magnetic field depends on the magnetic susceptibility and density difference between the object and the surrounding liquid. Here, we developed a magnetic susceptibility-based protein detection scheme in a low-cost and miniatur...
Citation Formats
E. Tan, “Characterization of electromagnetic wave absorbing properties of sic-based and alumina ceramic woven fabrics,” M.S. - Master of Science, Middle East Technical University, 2008.