Abstract
The corrosion of pressureless sintered silicon carbide (SiC) in molten LiF-NaF-KF (FLiNaK) salts at 700 ℃ was investigated. Results indicate that the impurities in the molten FLiNaK salt play an important role in the corrosion of SiC. The pressureless sintered SiC occurred local corrosion along the grain boundaries and the intersections of grains in the FLiNaK salt with more metallic impurities. The corrosion results in the formation of carbon, Fe3Si, and the dissolvable Si-containing products. The reaction between SiC and metallic impurities in the salt drives the corrosion of SiC by enhancing the outward diffusion of element Si.
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