Abstract
Plasma-sprayed ceramic coatings are formed by introducing a powder into a plasma jet to produce a stream of molten particles which then impact, spread and rapidly solidify onto a substrate to form a lamellar microstructure. The cohesive and adhesive fracture toughness of zirconia coatings, fully or partially stabilized with Y 2O 3 or CeO 2, plasma sprayed onto steel, have been determined using the double cantilever beam (DCB) technique. The results show that cohesive fracture toughness is greater than adhesive toughness and that tetragonal coatings have significantly higher toughness than fully stabilized (cubic) zirconia coatings. The highest toughness was achieved with ZrO 2-CeO 2 coatings which contained a significant proportion of transformable tetragonal phase. The results are interpreted in terms of the influence of grain size and composition on the tetragonal-to-monoclinic phase transformation.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
