Abstract
ABSTRACTGas-escape pores in nuclear graphite IG-110 and T220 were characterized by using optical microscopy. It is proved that reliable size distribution of pores can be derived by processing optical images of graphite. The results were compared with those obtained from mercury porosimetry test and X-ray tomography. Optical microscopy showed that the majority of IG-110’s (T220’s) porosity is contributed by pores with sizes around 13 (3) µm, which was confirmed by X-ray tomography for IG-110. But, mercury porosimetry test indicated that pores with sizes around 2.3 (0.9) µm contribute the majority of IG-110’s (T220’s) porosity. The difference between mercury porosimetry and the other two techniques suggests that the graphite pores are connected by relatively thinner channels.
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