Thermal Fracture of Multilayer Ceramic Thermal Barrier Coatings

Y. R. Takeuchi, K. Kokini
1992 Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education   unpublished
Controlled experiments and a corresponding analytical model were developed to investigate the reasons for crack initiation in multilayer ceramic thermal barrier coatings. The experiments and model determined that surface cracks form as a result of tensile stresses created following stress relaxation in the ceramic at steady state high temperatures (about 900°C-1100°C). Interface cracks generated by out of plane stresses are affected by the presence of these surface cracks and thermal transients
more » ... thermal transients and, possibly, edge effects.
doi:10.1115/92-gt-318 fatcat:gmyb7eeg4bdmlpi7x7osxyn34a