Abstract
Hot-pressed SiC and pressureless-sintered SiC polycrystalline specimens were neutron-irradiated in the Japan Materials Testing Reactor up to 4.5 × 10 24 n/m 2 ( E ≫ 1.0 MeV). The bulk specimens were crushed into powders to increase surface area. Weight change of the specimen and released CO 2 gas content were measured after isothermal annealing between 500 and 1300°C in oxidizing atmosphere using an electric balance and a gas chromatograph, respectively. There was no significant difference between irradiated and unirradiated specimens, for both hot-pressed and pressureless-sintered specimens. All of the weight gain data and amount of evolved CO 2 satisfied a parabolic rate law against oxidation time. Apparent activation energy of the reaction confirmed the diffusion of O 2 molecules through amorphous SiO 2 layer. However, apparent activation energy decreased by the irradiation only in pressureless-sintered SiC containing B, suggesting the effect of transmuted atoms, or Li.
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