Systematic study of microwave absorption, heating, and microstructure evolution of porous copper powder metal compacts

J. Ma, J. F. Diehl, E. J. Johnson, K. R. Martin, N. M. Miskovsky, C. T. Smith, G. J. Weisel, B. L. Weiss, D. T. Zimmerman

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Abstract

We present a systematic study of the absorption, heating behavior, and microstructure evolution of porous copper powder metal compacts subjected to 2.45 GHz microwave radiation and explain our observations using known physical mechanisms. Using a single-mode microwave system, we place the compacts in pure electric (E) or magnetic (H) fields and compare the heating trends. We also investigate the effect of particle size on the same. The observed trends and the differences between E- and H-field heating are reflected in the dramatic changes in the conductivity, permittivity, and permeability of the samples. These property changes are effected by the microstructure evolution during heating in the two types of fields. We also find that the observed dependence of the initial microwave heating on particle size is suggestive of single-particle behavior.

Original languageEnglish (US)
Article number074906
JournalJournal of Applied Physics
Volume101
Issue number7
DOIs
StatePublished - Apr 24 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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