4:55 PM - 5:10 PM
[1C09] Hydrothermal corrosion behavior of SiC ceramics under metal impurities-dissolved environment
Keywords:SiC ceramics, Alternative material of fuel cladding, Protective oxide film, Hydrothermal corrosion
In order to evaluate the hydrothermal corrosion behavior of silicon carbide (SiC) ceramics, which is expected as the alternative material of zircaloy used in the current fuel cladding, corrosion test for hot-pressed or CVD-SiC ceramics were conducted under hydrothermal condition (300℃, 8.8MPa, 120h) in water with large or small amount of dissolved metal impurities (Na, Mg, Al, Ca, Cr, etc). In water with small amount of dissolved metal impurities, the grain boundaries of SiC ceramics were preferentially corroded. In water with large amount of dissolved metal impurities, Al and Cr-oxide film was formed on SiC ceramics. Since no trace derived from hydrothermal corrosion was observed, it was clarified that the oxide film acts as protected layers against hydrothermal corrosion.