Phase formation and transformation in alumina/YSZ nanocomposite coating deposited by suspension plasma spray process

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DOIResolve DOI: http://doi.org/10.1007/s11666-009-9461-8
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TypeArticle
Journal titleJournal of Thermal Spray Technology
Volume19
Issue4
Pages787795; # of pages: 9
Subjectalumina/yttria-stabilized zirconia; amorphous phase; ceramic composite coating; crystalline structure; suspension plasma spray; thermal changes
AbstractSuspension Plasma Spray process was used for deposition of pseudo-eutectic composition of aluminayttria- stabilized zirconia as a potential thermal barrier coating using Mettech axial III torch. Process variables including feed and plasma parameters were altered to find their effects on the formation of phases in the composite coating. The in-flight particle velocity was found to be the crucial parameter on phase formation in the resulting coatings. Low particle velocities below 650 m/s result in the formation of stable phases i.e., a-alumina and tetragonal zirconia. In contrast, high particle velocities more than 750 m/s favor the metastable c-alumina and cubic zirconia phases as dominant structures in as-deposited coatings. Accordingly, the plasma auxiliary gas and plasma power as influential parameters on the particle velocity were found to be reliable tools in controlling the resulting coating structure thus, the consequent properties. The noncrystalline portion of the coatings was also studied. It was revealed that upon heating, the amorphous phase prefers to crystallize into pre-existing crystalline phases in the as-deposited coating. Thus, the ultimate crystalline structure can be designed using the parameters that control the particle velocity during plasma spray coating.
Publication date
LanguageEnglish
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NRC number52374
NPARC number16891217
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Record identifierfd397904-1c36-4546-a4a3-89523df2542d
Record created2011-02-20
Record modified2016-05-09
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