Effects of burn-off on thermal shock resistances of nuclear carbon materials

摘要: Abstract The purpose of this study is to evaluate the effects burn-off on thermal shock resistances and fracture toughnesses a carbon fiber reinforced composite (C/C composite) three fine-grained isotropic graphites. These were degraded slightly by air oxidation at 500 °C. extents degradations parameters less than those mechanical mechanics properties, however, they larger that diffusivity. In observations microstructures surfaces after graphites, size number pores increased rough due boundaries graphite particles. After C/C composite, there preferential removal boundary layer between pyrolytic matrix pull out fiber.