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Thermal cycling of suspension plasma sprayed Alumina-YSZ coatings containing amorphous phases
; Tarasi, Fariba
; Medraj, Mamoun
; Dolatabadi, Ali
; Lima, Rogerio S.
NRC Industrial Materials Institute
Journal of the American Ceramic Society
thermal cyclic test; amorphous phase; composite ceramic; alumina-zirconia; thermal barrier coating
Thermal cyclic test at 1080°C for various numbers of cycles was performed on suspension plasma-sprayed coatings of alumina-yttria-stabilized zirconia composites and yttria-stabilized zirconia (YSZ). The structural variations of composite coatings were studied to verify the possibility of production of nano-composite coatings with nano-dispersed oxides. The results showed that this composite exhibited a lower thermally grown oxide growth than that of the YSZ. New multi-constituent composites formed of alternative regions of nano-precipitates of alumina in zirconia matrix and nano-precipitates of zirconia in alumina matrix were developed via phase transformation through thermal cyclic process of amorphous-containing structure.