, Up to 2000h in the liquid Na with [O]< 5 or [O]=1000ppm CVD SiC: -Slight decrease of oxide and oxicarbide phases on surface (no weight loss) for "pure" Na -Slight surface oxidation and weight loss for Na(O) ? SiC is not significantly affected by sodium immersion

/. Sic and . Sic, Increase of rupture stress (+25%) and strain (+13%) on non pre-damaged samples -No effect of high oxygen concentration in sodium -No effect of pre-damaging on samples ? Interphase is not affected -Hypothesis: healing of pre-existing cracks by sodium for undamaged samples ? Tests on SiC/SiC plates