Characterization of Si3N4 coated with chemically-vapor-deposited mullite after Na2SO4-induced corrosion

Woo Y. Lee, Karren L. More, David P. Stinton, Yong W. Bae

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22 Scopus citations

Abstract

Si3N4 substrates coated with chemically-vapor-deposited, crystalline mullite (3Al2O3·2SiO2) were subjected to a corrosive environment containing Na2SO4 and O2 at 1000°C for 100 h. The composition and microstructure of the as-deposited and corroded specimens were examined and compared. The coating appeared to be effective in preserving and therefore protecting the surface microstructure of the underlying Si3N3 substrates. However, a small degree of Na penetration through mullite grain boundaries was observed to a coating depth of ∼1 μm.

Original languageEnglish
Pages (from-to)2489-2492
Number of pages4
JournalJournal of the American Ceramic Society
Volume79
Issue number9
DOIs
StatePublished - Sep 1996

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