Rare earth silicate environmental barrier coatings for SiC/SiC composites and Si3N4 ceramics

Rare earth silicates have been investigated to evaluate their potential as an advanced environmental barrier coating (EBC) having higher temperature capability than current EBCs. Volatility data in high steam environments indicate that rare earth monosilicates (RE2SiO5; RE: rare earth element) have...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 25; no. 10; pp. 1705 - 1715
Main Authors LEE, Kang N, FOX, Dennis S, BANSAL, Narottam P
Format Conference Proceeding Journal Article
LanguageEnglish
Published Oxford Elsevier 2005
Subjects
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Cermets, ceramic and refractory composites
Chemical industry and chemicals
Corrosion protection
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Materials science
Other materials
Physics
Specific materials
Structural ceramics
Surface treatments
Technical ceramics
Ceramic matrix composite
Si3N4
Coating material
Volatility
Environmental barrier coating
Experimental study
SiC
Composite material
Non oxide ceramics
Structural ceramic
Silicon Carbides
Silicon Nitrides
Lanthanide Silicates
Barrier material
Thermal barrier coatings
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Summary:Rare earth silicates have been investigated to evaluate their potential as an advanced environmental barrier coating (EBC) having higher temperature capability than current EBCs. Volatility data in high steam environments indicate that rare earth monosilicates (RE2SiO5; RE: rare earth element) have lower volatility than the current barium strontium aluminum silicate (BSAS) EBC top coat in combustion environments. Rare earth silicates also exhibit superior chemical compatibility compared to BSAS. The superior chemical compatibility and low volatility are key attributes to achieve higher temperature capability. The chemical compatibility is especially critical for EBCs on Si3N4 because of the high chemical reactivity of some of the oxide additives in Si3N4. In simulated combustion environments, EBCs with a rare earth monosilicate top coat exhibit superior temperature capability and durability compared to the current state-of-the-art EBCs with a BSAS top coat.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2004.12.013