A large amount of carbon material is used in high-temperature gas-cooled reactor (HTGR), with an initial moisture content less than 0.1 %, and under the high temperature condition during reactor’s operation the material would be corroded by chemical corrosion reaction with moisture. The carbon materials in HTGR include carbon material with boron carbide (BC) and graphite IG-110. Based on the moisture absorption experiment of BC, the effective diffusion coefficient D of BC is fitted, and D = 1.35 × 10−9 (m2/s). The experiments shows with the same condition of temperature and humidity, the moisture absorption of BC is higher than that of IG-110. As the environment humidity increases, the moisture absorption increases.

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