Advanced Environmental Barrier Coatings (EBC’s) |
| Journal |
Key Engineering Materials (Volume 333) |
| Volume |
Functional Gradient Ceramics, and Thermal Barriers |
| Edited by |
Marc Anglada et al. |
| Pages |
59-70 |
| DOI |
10.4028/www.scientific.net/KEM.333.59 |
| Online since |
March, 2007 |
| Authors |
T. Kulkarni,
S.N. Basu,
V.K. Sarin
|
| Keywords |
Chemical Vapor Deposition, Composition Gradation, High Temperature Stability, Mullite Coatings, Protective Coatings |
| Abstract |
Dense, uniform and crack-free mullite (3Al2O3·2SiO2) coatings were deposited on Sibased
substrates by chemical vapor deposition using the AlCl3–SiCl4–H2–CO2 system. The coatings
were compositionally graded, with the Al/Si ratio increasing towards the outer surface of the
coatings for improved corrosion resistance. Mullite grains nucleated when the surface composition
of the growing coating was in a narrow range close to that of stoichiometric mullite. The growth
rate and crystal structure of mullite were dependent upon temperature, pressure, reactant
concentration, and reactant ratios. The phase transformations occurring in these coatings during
high-temperature anneals in the range 1100–1400 °C were studied. |
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