Abstract
Thin (0.05 cm) layers of mechanical mixtures of conductive and insulating powders are heated by microwave pulses with an intensity of about 10 kW/cm2. For mW-power microwaves, the absorption thickness in the mixtures is found to be on the order of 1 cm. For intensities of 10 kW/cm2 and above, pulse durations of 5–8 ms, and the number of pulses in a train of 5 or less, the powder layer melts and the characteristic spatial scale of absorption decreases to ≈0.05 cm. The reflection factor drops during a microwave pulse. Ways of improving the absorption efficiency by initiating surface breakdowns and plasma formation in pores between coarse grains in the bulk of the powders are considered.
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Translated from Zhurnal Tekhnichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 71, No. 7, 2001, pp. 119–123.
Original Russian Text Copyright © 2001 by Batanov, Berezhetskaya, Kossy\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\), Magunov, Silakov.
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Batanov, G.M., Berezhetskaya, N.K., Kossyi, I.A. et al. Pulsed heating of thin powder layers by intense microwaves. Tech. Phys. 46, 905–909 (2001). https://doi.org/10.1134/1.1387555
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DOI: https://doi.org/10.1134/1.1387555