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Effect of hydrothermal corrosion on the fracture strength of SiC layer in tristructural‐isotropic fuel particles
Author(s) -
Xie Xin,
Liu Bing,
Guo Yi,
Liu Rongzheng,
Zhao Xiaofeng,
Ni Na,
Guo Fangwei,
Xiao Ping
Publication year - 2019
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/jace.16369
Subject(s) - corrosion , materials science , autoclave , hydrothermal circulation , dissolution , layer (electronics) , grain boundary , metallurgy , composite material , isotropy , microstructure , chemical engineering , physics , quantum mechanics , engineering
Abstract The hydrothermal corrosion behavior of SiC layer in tristructural‐isotropic (TRISO) fuel particles and its effect on the fracture strength were investigated. The corrosion test was performed using the static autoclave at 400°C/10.3 MPa. The SiC layer exhibited a thickness loss and the corrosion rate followed a linear law. During corrosion, carbon was formed on the SiC surface due to the loss of Si. The corrosion was found preferentially occurred at the grain boundary of SiC, leading to the grain detachment and pit formation. The rate determining step of the corrosion was SiO 2 formation rather than SiO 2 dissolution in the hydrothermal environment. The fracture strength of SiC shell after corrosion was evaluated using the crush test. It showed a slight decrease with an increase in corrosion time, due to the thickness reduction in SiC layer. The results of this study demonstrated that the SiC in TRISO particles has good corrosion resistance in the hydrothermal environment.