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 8OO°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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