F. Tarasi, M. medraj, A. dolatabadi, Concordia University, Montreal, QC, Canada; J. Oberste-Berghaus, Industrial Materials Institute, National Research Council Canada, Boucherville, QC, Canada; C. Moreau, National Research Council Canada (CNRC-NRC), Boucherville,, QC, Canada
Suspension Plasma Spray (SPS) process is used for deposition of eutectic composition of Alumina-Yittria Stabilized Zirconia composite as a potential thermal barrier coating. Variables including feed, process and substrate related parameters were altered to find the key spray parameters on phase formation in each component of the composite coating including Alumina and Stabilized Zirconia. The most significant variable was recognized to be the plasma auxiliary gas. This variable rules the formation of the crystalline/non-crystalline phases by affecting the resulting in-flight particle state, especially the particle velocity. In this work also the mechanical properties were revealed to be a function of particle velocity. Thermal changes of the composite coating were studied based on differential thermal analyses as well as heat treatment results.
Summary: this work is an investigation about different phases that can form within the coating of composite material alumina-Zirconia deposited by a single process that is Suspension Plasma Spray(SPS). the study reveals some decisive parameters that can vary the phasese present in as deposited coating and follows the variation of these phases upon temperature increase.
