Factors affecting the hydrothermal corrosion behavior of chemically vapor deposited silicon carbides

Comparison of hydrothermal corrosion behavior of SiC with Al2O3 and Al2O3 + Y2O3 sintering additives

“…In this study, both LPS-SiC specimens were corroded, this can be attributed to the fact that the nanograins have higher grain boundaries and higher interfacial energy, making them susceptible to react with water. 25 In addition, due to the segregation of sintering additives at grain boundaries, the corrosion resistance of LPS-SiC ceramics mainly depends on the type and composition of the grain boundary phase.…”

“…For ultimate deployment of SiC‐based materials as nuclear fuel or cladding, a number of engineering issues must be explored and quantified, including the corrosion behavior of SiC in hydrothermal environment (350°C/15 MPa) . Many studies have addressed the dissolution characteristics of SiC ceramics in the high temperature and pressure water . Shin et al have reported the hydrothermal corrosion behavior of CVD‐SiC and concluded that the hydrothermal corrosion of CVD‐SiC was strongly influenced by electrical conductivity .…”

“…4 Many studies have addressed the dissolution characteristics of SiC ceramics in the high temperature and pressure water. 4,[18][19][20][21][22][23][24][25][26] Shin et al have reported the hydrothermal corrosion behavior of CVD-SiC and concluded that the hydrothermal corrosion of CVD-SiC was strongly influenced by electrical conductivity. 25 Terrani et al have also reported the hydrothermal corrosion of CVD-SiC in LWR coolant environment and concluded that the kinetics of SiC recession under hydrothermal condition was surface oxidation reaction limited.…”

“…4,[18][19][20][21][22][23][24][25][26] Shin et al have reported the hydrothermal corrosion behavior of CVD-SiC and concluded that the hydrothermal corrosion of CVD-SiC was strongly influenced by electrical conductivity. 25 Terrani et al have also reported the hydrothermal corrosion of CVD-SiC in LWR coolant environment and concluded that the kinetics of SiC recession under hydrothermal condition was surface oxidation reaction limited. 19 Kim et al have reported the effect of dissolved hydrogen on the corrosion behavior of CVD-SiC in LWR coolant environment and concluded that the dissolved hydrogen significantly increased the corrosion resistance of the CVD SiC by retarding formation of the surface oxide layer.…”

Oxidation of 3D‐printed SiC in air and steam environments

“…Highly pure, stoichiometric, crystalline SiC is desirable for applications involving exposure to irradiation‐induced displacement damage 8,9 and/or high temperatures 10 . Chemical purity and crystallinity can impact oxidation behavior in aqueous environments 11,12 and during high‐temperature exposure 13‐15 . A target application of the combined binder jetting and CVI method 7 is to form the fuel matrix for advanced nuclear reactors 16 , where the 3D‐printed SiC will form the ceramic matrix that hosts encapsulated tristructural isotropic (TRISO) fuel particles, 17 shown in Figure 1.…”