Architecture of Functionally Graded Ceramic Coatings Against Surface Thermal Fracture
- 1 October 1996
- journal article
- Published by ASME International in Journal of Engineering Materials and Technology
- Vol. 118 (4), 522-528
- https://doi.org/10.1115/1.2805951
Abstract
An analytical study was performed to study the effect of architecture on the initiation of surface cracking in multilayer ceramic coatings. Two modes of crack initiation were considered: 1) tension resulting from stress relaxation, and 2) cyclic thermal fatigue. Transient temperature distributions were determined using a finite difference technique, and stress distributions were calculated using a multilayer beam theory. The results showed that as more layers were added and as the ceramic coating became thinner, lower maximum surface stresses resulted during cooling after stress relaxation. Also, a thick eight layer coating had similar thermal fatigue behavior to a thin single layer coating. It was determined that a thick multilayer coating adds a significant amount of thermal protection when compared to a thin single layered coating.Keywords
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