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

โœ Scribed by T.D. Burchell; I.M. Pickup; B. McEnaney; R.G. Cooke

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
718 KB
Volume
24
Category
Article
ISSN
0008-6223

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โœฆ Synopsis

Evidence for the different effects of thermal and radiolytic corrosion on the microstructure ;md porosity development of two needle-coke filler. pitch binder graphites are presented. An interprct;ltion of the effect5 of these microstructural changes upon elastic modulus is given by utilising km analytic:tl derivation of the empirical Knudsen equation. The more severe decrements of modulus found in thermally corroded graphites are ascribed to preferential development of mirrow. slit-shaped pores of high aspect ratio within the binder phase. The selective attach of these pores is attributed to the thermal rrnction ;misotropy of the graphite-CO, reaction. Radiolytically activated CO: ;ittacks graphite mlcroatructurc less selectively developing pores of iow aspect ratio which cause less tevere decrements in elastic modulus. Key Words-~ucle~lr graphites. e&tic modulus. microstructure. thermal corrosion, radiolytic c(~rr(~si~)n.

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