Particle Impact Damage and Point Load-Induced Fracture Behavior in Zirconia Plasma Spray Coating Film

This study concerns the method for examining the load conditions and evolving stress related to debonding at the coat-substrate interface to identify the responsible factors, by indenting a ceramic coated specimen with a spherical indenter either through impact or quasi-statically under static loading. The morphology of cracks induced by the impact of a foreign object on to specimens of inconel substrate with thermo-resistive coating of zirconia sprayed by two different methods was studied in comparison with the indentation test results by a spherical indenter under static loading. Consequently, the load conditions for coat fracture and debonding at the coat-substrate interface were successfully identified in a plasma spray specimen.