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The present study investigates the effect of varying particle size and  porosity on the heating behavior of a metallic particulate compact in a  2.45GHz multimode microwave furnace. Experiments on copper suggest that  unlike monolithic (bulk) materials, metallic materials do couple with  microwaves when they are in particulate form. The powder compacts having  higher porosity and smaller particle sizes interact more effectively with  microwaves and are heated more rapidly. A dynamic electromagnetic-thermal  model was developed to simulate the temporal temperature distribution using a  2-D finite difference time domain (FDTD) approach. The model predicts the  variation in temperature with time during heating of copper powder compacts.  The simulated heating profiles correlate well with those observed from  experiments

Effect of porosity and particle size on microwave heating of copper