Corrosion behavior of pressureless-sintered SiC in molten NaCl-KCl-MgCl2 salt at 700°C

The corrosion behavior of pressureless-sintered SiC in a molten NaCl-KCl-MgCl2 salt at 700 degrees C was investigated. Results indicate that it is prior for SiC and sintering aid B around grain boundaries to be corroded. MgCl2.xH(2)O(x = 4,6) in the salt plays an important role in the corrosion of SiC. MgCl2.xH(2)O is hydrolyzed to HCl, H2O, and MgO, which react with SiC and B to form C, SiO2, SiCl4, B2O3, and Mg2SiO4. The corrosion depth of SiC and the concentrations of elements Si and B in the salt increase with the corrosion time, which are fitted well with Fick's law of diffusion.

Automated summary

The research demonstrates that the corrosion depth of SiC and the concentrations of elements Si and B in the salt increase with the corrosion time, which are well fitted with Fick's law of diffusion.