It is critical to understand fundamental failure processes in order to design coatings for engineering purposes. The failure of ZrO2-8 wt% Y2O3 plasma-sprayed coatings is examined in the present work. The coatings were incorporated in a tensile-adhesion test arrangement and the acoustic emission (AE) was monitored. The AE generated during failure is related to the cracking process, and these are both related to the fracture morphology. Heat treatment of the coating affected changes in the AE count-rate distribution. This may be interpreted in terms of the morphological features of the coating. The relationship of the bond-strength tests to AE and fracture behavior give insight into the mechanism of adhesion of plasma-sprayed coatings.
Ceramic Engineering and Science Proceedings: Proceedings of the 6th Annual Conference on Composites and Advanced Ceramic Materials / William J. Smothers (ed.),
Vol. 3, pp. 772-792