High-temperature chemical stability of plasma-sprayed Ca0.5Sr0.5Zr4P6O24 coatings on nicalon/SiC ceramic matrix composite and Ni-based superalloy substrates

Woo Y. Lee, Kevin M. Cooley, Christopher C. Berndt, Debra L. Joslin, David P. Stinton

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The potential application of Ca0.5Sr0.5Zr4P6O24 (CS50) as a corrosion-resistant coating material for Si-based ceramics and as a thermal barrier coating material for Ni-based superalloys was explored. A ∼200 μm thick CS50 coating was prepared by air plasma spray with commercially available powder. A Nicalon/SiC ceramic matrix composite and a Ni-based superalloy coated with a ∼200 μm thick metallic bond coat layer were used as substrate materials. Both the powder and coating contained ZrP2O7 as an impurity phase, and the coating was highly porous as-deposited. The coating deposited on the Nicalon/SiC substrate was chemically stable upon exposure to air and Na2SO4/O2 atmospheres at 1000°C for 100 h. In contrast, the coating sprayed onto the superalloy substrate significantly reacted with the bond coat surface after similar oxidation in air.

Original languageEnglish
Pages (from-to)2759-2762
Number of pages4
JournalJournal of the American Ceramic Society
Volume79
Issue number10
DOIs
StatePublished - Oct 1996

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