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.
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October 1996
Technical Papers
Architecture of Functionally Graded Ceramic Coatings Against Surface Thermal Fracture
B. D. Choules,
B. D. Choules
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
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K. Kokini
K. Kokini
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
Search for other works by this author on:
B. D. Choules
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
K. Kokini
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
J. Eng. Mater. Technol. Oct 1996, 118(4): 522-528 (7 pages)
Published Online: October 1, 1996
Article history
Received:
May 8, 1994
Revised:
May 12, 1996
Online:
November 27, 2007
Citation
Choules, B. D., and Kokini, K. (October 1, 1996). "Architecture of Functionally Graded Ceramic Coatings Against Surface Thermal Fracture." ASME. J. Eng. Mater. Technol. October 1996; 118(4): 522–528. https://doi.org/10.1115/1.2805951
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