The relationship between microstructure and the reduction of elastic modulus in thermally and radiolytically corroded nuclear graphites

摘要: Evidence for the different effects of thermal and radiolytic corrosion on microstructure porosity development two needle-coke filler, pitch hinder graphites are presented. An interpretation these microstructural changes upon elastic modulus is given by utilising an analytical derivation empirical Knudsen equation. The more severe decrements found in thermally corroded ascribed to preferential narrow, slit-shaped pores high aspect ratio within binder phase. selective attack attributed reaction anisotropy graphite-CO2 reaction. Radiolytically activated CO2 attacks graphite less selectively developing low which cause modulus.