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 |
| Citation | T. Kulkarni et al., 2007, Key Engineering Materials, 333, 59 |
| Online since | March, 2007 |
| Authors | T. Kulkarni, S.N. Basu, V.K. Sarin |
| Keywords | Chemical Vapour Deposition (CVD), Composition Gradation, High Temperature Stability, Mullite Coatings, Protective Coating |
| 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. |
| Full Paper | 
Get the full paper by clicking here
|
First page example
