Abstract

Coatings of Ca0.5Sr0.5Zr4(PO4)6 (CS-50), an ultra-low thermal-expansion material, have been successfully developed to protect SiC-based materials from sulfate salt corrosion. The coatings were applied to fiber-reinforced, SiC-matrix composite heat exchanger tubes and clay-bonded SiC. Aqueous slurries were prepared and applied to the SiC substrates. One coating process for heat exchanger material substrates, consisted of mechanically dipping the samples in a slip. A spin-coating process has also been developed that produced thin, non-obstructing coatings for hot-gas filter substrates. The thermal shock and corrosion resistance of coated parts were evaluated, and preliminary results are encouraging for the use of CS-50 as a protective coating.

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