| Autor: |
Korotash, I. V., Polishchuk, S. S., Rudenko, E. M. |
| Předmět: |
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| Zdroj: |
Applied Nanoscience; Jul2023, Vol. 13 Issue 7, p4989-4995, 7p |
| Abstrakt: |
Basalt fiber (BF)/nickel and BF/graphite composites having various filler concentrations were prepared using mechanical alloying followed by simple press and sintering. Microwave absorption (MWA) properties of the basalt-based composites in the frequency range of 1.5–2.1 GHz were investigated. It is shown that the absorption of microwave radiation significantly depends on the properties of both the fillers (non-magnetic graphite or magnetic nickel) and their concentrations. An anisotropy of MWA in two mutually perpendicular directions in the specimen plane for both studied composites was first found. The characters of the dependences of microwave loss (MWL) on the filler concentration were shown to be similar for the BF/graphite composites and one of the orientation directions of BF/nickel composites. For these cases, the maxima of MWL for both the composites were observed at the filler concentration of 30 wt%. Further increase in the filler concentration leads to a decrease in MWL. For the case of another orientation (rotating the specimen by 90°) BF/nickel composite with the filler concentration of more than 30 wt%, the magnitude of MWL continues growing at a slow pace with nickel content. The maximum MWA in BF/graphite composites is found to be 1.5–2 times higher than for BF/nickel composites. At the same time, at low filler concentrations (less than 30 wt%), the MWA in BF/nickel composites is significantly larger than for corresponding BF/graphite composites. The structure and phase composition of the prepared composites were studied using microscopy and XRD methods. Physical mechanisms of the observed MWA peculiarities are discussed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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