Microstructure of Suspension Plasma Spray and Air Plasma Spray Al_2O_3-ZrO_2 Composite Coatings
Journal of Thermal Spray Technology
Dianying Chen ；Eric H. Jordan ；Maurice Gell
Al_2O_3-ZrO_2 coatings were deposited by the suspension plasma spray (SPS) molecularly mixed amorphous powder and the conventional air plasma spray (APS) Al_2O_3-ZrO_2 crystalline powder. The amorphous powder was produced by heat treatment of molecularly mixed chemical solution precursors below their crystallization temperatures. Phase composition and microstructure of the as-synthesized and heat-treated SPS and APS coatings were characterized by XRD and SEM. XRD analysis shows that the as-sprayed SPS coating is composed of α-Al_2O_3 and tetragonal ZrO_2 phases, while the as-sprayed APS coating consists of tetragonal ZrO_2, α-Al_2O_3, and γ-Al_2O_3 phases. Microstructure characterization revealed that the Al_2O_3 and ZrO_2 phase distribution in SPS coatings is much more homogeneous than that of APS coatings.
keywords:Alumina Amorphous powders Plasma spray coatings Suspension plasma spray Zirconia
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