| Abstract: |
Suspension plasma spraying is gaining greater interest in emerging applications where advanced ceramic coatings are required. Mettech developed an axial injection plasma spraying (ASPS) coupled with an automatic suspension feed system, and demonstrated its capability to overcome the complexities of the process and deliver quality coatings. By modification of process parameters including selection of powders, make-up of suspensions, and plasma conditions, the coating microstructures and properties can be tailored for emerging applications such as solid oxide fuel cells (SOFCs), plasma erosion resistant coatings, and advanced thermal barrier coatings (TBCs). Dense YSZ and Y2O3 coatings were achieved with high functional properties for SOFC and plasma erosion resistance applications, respectively. By contrast, very porous and columnar structured TBCs, similar to those deposited by electron beam-physical vapor deposition (EB-PVD) have also been produced with ASPS.
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