Abstract No.:
2501

 Scheduled at:
Wednesday, September 28, 2011, Saal B2.1 4:00 PM
Plasma Spraying 1


 Title:
Enhancement of amorphous phase formation in alumina-YSZ coatings deposited by suspension plasma spray process

 Authors:
Fariba Tarasi / Concordia University, Canada
Ali Dolatabadi/ Concordia University, Canada
Mamoun Medraj/ Concordia University, Canada
Jorg Oberste-Berghaus/ IMI-NRC, Canada
Christian Moreau*/ IMI-NRC, Canada

 Abstract:
In the present work on pseudo-eutectic alumina-yttria stabilized zirconia composite, the influential parameters on amorphous phase formation during suspension plasma spray deposition are investigated. Several variables were evaluated as the most probably influential factors on the amorphous phase content. These variables include powder feed size, in-flight particle characteristics (temperature and velocity), spraying robot travel speed, preheating the substrate, number of deposition passes and the presence of bond coat. It was found that the larger particle size, higher robot speed and preheating the substrate are in favor of larger amounts of the amorphous phase. Moreover, particle velocity and temperature need to be reasonably low to get greater amorphous content; and bond coat presents no considerable role on formation of amorphous phase. In contrast, the increased number of deposition passes is detrimental to this phase. This work also discusses some correlation between the amorphous phase content and the in-flight particle characteristics.

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