Reticulated vitreous carbon foam manufactured via the sponge replication technique has a much more homogeneous, more open structure relative to traditional ceramic foam manufactured by similar methods. To characterize this difference, the flow properties of various carbon foam samples having different pore sizes and densities were measured and compared to those for conventional ceramic foam. The part-to-part variation for carbon foam proved to be much lower than that for ceramic, and equivalent pressure drops were achieved in carbon foam at much smaller pore sizes. These and other aspects of the processing, microstructure and properties of carbon foam will be discussed.
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