This study experimentally investigates microwave heating of compressed powder compacts of a good bulk conductor, aluminum, as a function of particle size. Specifically, the aluminum samples consisted of 40, 80 and 120 nanometer (nm) particle sized powder that were compressed at a constant bulk density. An electromagnetic chamber exposed the powder compacts to microwaves at a frequency of 1.7 GHz for a controlled duration of 60 seconds. Two-dimensional transient temperature measurements were made using a high speed infrared (IR) camera. Results indicate that as the particle size decreases microwave heating significantly increases.
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