Abstract
A 25 nm thick α-alumina layer was deposited on a turbine-grade silicon nitride by sol-gel dip coating and subsequent heat treatment in air at 1200°C. This layer had a nanometer grain structure. Silicon nitride protected by this thin layer showed a significant improvement in oxidation resistance over its uncoated counterpart after 200 cyclic exposures in air at 1250°C. The oxide layer grown on the coated silicon nitride also exhibited superior surface morphology, compared with the uncoated silicon nitride.
Original language | English |
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Pages (from-to) | 1622-1624 |
Number of pages | 3 |
Journal | Journal of the American Ceramic Society |
Volume | 86 |
Issue number | 9 |
DOIs | |
State | Published - Sep 2003 |