Silicon-based ceramics such as silicon carbide and
silicon nitride are found in microturbines, used in
on-site power generation systems. These ceramics can
withstand higher operating temperatures than the conventional
superalloys, leading to improved efficiency and environmentally
cleaner byproducts. However, when exposed to corrosive
environments containing high-pressure steam at elevated
temperatures, these silicon-based ceramics are susceptible
to hot-corrosion and recession. We are currently developing
functionally graded chemically vapor deposited mullite
environmental barrier coatings with excellent corrosion,
recession and thermal shock resistance. These environmental
barrier coatings are expected to substantially improve
the service lifetimes of these silicon-based ceramic
components.
Collaborators
V.
K. Sarin, Boston University
Papers
Please click any active link to read full
pdf versions of the article.
S.N. Basu and V.K. Sarin, "Functionally Graded
CVD Mullite Coatings", accepted for publication
in Materials Research Society Symposium Proceedings,
2002.
P. Hou, S.N. Basu and V.K.
Sarin, "Structure and High Temperature Stability
of Compositionally Graded CVD Mullite Coatings"
International Journal of Refractory Metals and Hard
Materials, 19 (4-6), 467 (2001).
S.N. Basu and V.K. Sarin , "Development Of CVD
Mullite Coatings", Proceedings of the Fifteenth
International Conference on Chemical Vapor Deposition,
M. D. Allendorf and M. L. Hitchman eds., The Electrochemical
Society Proceedings Series 2000-13, (2000), p 308.
Ping Hou, S. N. Basu
and V. K. Sarin, "Nucleation Mechanisms in Chemically
Vapor-Deposited Mullite Coatings on SiC", J.
Materials Research 14 (7), 2952 (1999).
S. N. Basu, P. Hou and
V. K. Sarin, "Formation of Mullite Coatings on
Silicon Based Ceramics by Chemical Vapor Deposition",
Journal of Refractory Metals and Hard Materials, 16
(4-6), 343 (1998).
D. Doppalapudi and S. N.
Basu, "Structure of Mullite Coatings Grown by
Chemical Vapor Deposition", Materials Science
and Engineering, A231, 48 (1997).
D. Doppalapudi, S. N. Basu and V. K. Sarin, "Structural
Evolution of Mullite Coatings on Silicon Based Ceramics",
Proceedings of the Thirteenth International Conference
on Chemical Vapor Deposition, T. M. Besmann, M. D.
Allendorf, McD Robinson and R. K. Ulrich, eds., The
Electrochemical Society, pp 664 (1996).
D. Doppalapudi, R. Mulpuri, S. N. Basu and V. K.
Sarin, "Phase Transformations in Multilayered
CVD Mullite Coatings", Materials Research Society
Symposium Proceedings, 363, 95 (1995).
Funding
NSF - Growth of Mullite Coatings by Chemical Vapor
Deposition (with V.K. Sarin)
DOE - Adherent and Oxidation Resistant Coatings for
Ceramic Substrates (with V.K. Sarin).
NSF - Development of Iota-Alumina Coatings (with
V.K. Sarin).
NSF - FRG: Functionally Graded High-Al Mullite Environmental
Barrier Coatings (with V.K. Sarin and T. Murray)
|
