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.

Issue Section:
Technical Papers
Topics:
Ceramic coatings, Fracture (Materials), Fracture (Process), Coatings, Stress, Fatigue, Relaxation (Physics), Cooling, Diluents, Euler-Bernoulli beam theory, Temperature distribution, Tension, Transients (Dynamics)
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