Abstract
MUCH if not all of the so-called “closed porosity” in various nuclear graphites lies beyond extremely fine entrances, according to recent work at the British Coal Utilisation Research Association. These entrances can be penetrated by certain gases at high temperatures. It follows that the well known1–3 gradual decrease in “closed porosity” that occurs on thermal oxidation of graphites in gases can be accounted for by the erosive widening of such entrances. These conclusions are the result of two independent methods for measuring changes in porosity, which have been applied from room temperature to 1,073° K.
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NAPIER, B., SPENCER, D. Access of Gases to the Porosity of Synthetic Graphite at High Temperatures. Nature 218, 948–949 (1968). https://doi.org/10.1038/218948a0
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DOI: https://doi.org/10.1038/218948a0
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