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Effect of Microstructure on the Resilience of Silicon Carbide to Palladium Attack
Author(s) -
LópezHonorato Eddie,
Fu Kun,
Meadows Philippa Jill,
Tan Jun,
Xiao Ping
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04005.x
Subject(s) - microstructure , materials science , silicon carbide , palladium , activation energy , coating , texture (cosmology) , grain boundary , grain size , porosity , carbide , isotropy , composite material , metallurgy , chemical engineering , catalysis , chemistry , biochemistry , image (mathematics) , physics , quantum mechanics , artificial intelligence , computer science , engineering
The Pd/silicon carbide (SiC) reaction rate in tristructural isotropic (TRISO)‐coated fuel particles has been studied. We have shown that it is possible to reduce the attack by palladium significantly by controlling the SiC microstructure. Large grain sizes as well as high coating rates did not increase the attack by Pd as previously thought. The activation energy for the Pd/SiC reaction obtained for the optimized SiC coatings, 337 kJ/mol, is almost twice as high as for standard coatings (∼160–190 kJ/mol) and five times higher than for porous samples (67 kJ/mol). An increase of the (111) texture component and the characteristics of the grain boundaries are suggested as possible reasons for reduction of the Pd/SiC reaction.