Alkali/steam corrosion resistance of commercial SiC products coated with sol-gel deposited Mg-doped Al2TiO5 and CMZP
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The corrosion resistance of two commercially available SiC filter materials coated with Mg-doped Al2 Ti05 and (Ca 0.6.6' Mg0.52) Zr4P6024 (CMZP) was investigated in high-temperature high pressure (HTHP) alkali-steam environments. Coated specimen properties, including cold and hot compressive strengths, bulk density, apparent porosity, permeability, and weight change, dete~ed after exposure to 92% air-S% steam 10 ppm Na at 8OOÂ°C and 1.8 MPs for 500 h were compared with those of uncoated specimens. Procedures for applying homogeneous coatings of Mg-doped Al2 Ti05 and CMZP to porous SiC filters were established and coating of the materials was successfully accomplished. Efforts to stabilize the Al2 Ti05 coating composition at elevated temperature were successful. Coatings show promise for providing improved corrosion resistance of the materials in pressurized fluidized bed combustion (PFBC) environments as evidenced by higher compressive strengths exhibited by coated SiC specimens than by uncoated SiC specimens following HTHP alkali-steam exposure.
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