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

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DOIResolve DOI: http://doi.org/10.1016/j.surfcoat.2012.10.054
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TypeArticle
Journal titleSurface and Coatings Technology
ISSN0257-8972
Volume220
Pages191198; # of pages: 8
SubjectAlumina-YSZ; Amorphous phase; Amorphous phase formation; Ceramic composites; In-flight particle characteristics; Influence of spray parameters; Larger particle sizes; Suspension plasma sprays; Alumina; Coatings; Deposition; Plasma jets; Plasma spraying; Preheating; Amorphous materials
AbstractIn the present work on pseudo-eutectic alumina-yttria stabilized zirconia (YSZ) composite, the influence of spray parameters on amorphous phase formation during suspension plasma spray deposition is investigated. Several variables were evaluated as the most probable key factors influencing the amorphous phase formation. 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 larger particle size, higher robot speed and substrate preheating lead to larger amounts of amorphous phase. Moreover, it is shown that particle velocity and temperature need to be reasonably low to get greater amorphous content while the presence of a bond coat has no significant influence on the amorphous phase formation. In contrast, increasing the number of deposition passes is detrimental to this phase. This work also discusses some correlations observed between the amorphous phase content and the in-flight particle characteristics and coating grain sizes. © 2012 Elsevier B.V.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270700
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Record identifierfa42066e-e033-464e-8383-7122ed72b64e
Record created2014-02-17
Record modified2016-05-09
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