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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