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Characterization of Si 3 N 4 Coated with Chemically‐Vapor‐Deposited Mullite after Na 2 SO 4 ‐lnduced Corrosion
Author(s) -
Lee Woo Y.,
More Karren L.,
Stinton David P.,
Bae Yong W.
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb09003.x
Subject(s) - mullite , microstructure , materials science , coating , corrosion , grain boundary , penetration (warfare) , metallurgy , chemical vapor deposition , chemical composition , composite material , chemical engineering , mineralogy , ceramic , nanotechnology , chemistry , operations research , engineering , organic chemistry
Si 3 N 4 substrates coated with chemically‐vapor‐deposited, crystalline mullite (3Al 2 O 3 .2SiO 2 ) were subjected to a corrosive environment containing Na 2 SO 4 and O 2 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 Si 3 N 3 substrates. However, a small degree of Na penetration through mullite grain boundaries was observed to a coating depth of ∼1 μm.