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Understanding the Formation of Vertical Cracks in Solution Precursor Plasma Sprayed Yttria-Stabilized Zirconia Coatings

DSpace at IIT Bombay

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Title Understanding the Formation of Vertical Cracks in Solution Precursor Plasma Sprayed Yttria-Stabilized Zirconia Coatings
 
Creator GOVINDARAJAN, S
DUSANE, RO
JOSHI, SV
 
Subject THERMAL BARRIER COATINGS
CYCLING BEHAVIOR
MICROSTRUCTURES
DEPOSITION
MECHANISMS
SPALLATION
DROPLETS
SCIENCE
JET
 
Description Yttria-stabilized zirconia (YSZ) deposition by the solution precursor plasma spraying (SPPS) route has been of interest for potential thermal barrier coating (TBC) applications. It has been surmised that realization of unique microstructural features like vertical cracks, nanosized pores and fine splats in the TBCs can significantly enhance coating durability and performance. However, satisfactory control over the YSZ coating microstructure has been elusive in the absence of an adequate understanding of the mechanism responsible for coating deposition in SPPS. This study demonstrates the ability to tailor microstructure of deposited YSZ coatings over a wide range, from nano-porous coatings to a vertically cracked microstructure. Varying of precursor flow rate has been shown to dictate the pyrolysis events occurring in situ and, adopting this approach, YSZ coatings with widely varying microstructural features have been developed. The coatings have been characterized in detail and the observations correlated with in-flight particle generation and splat formation. These studies also provide useful insights into the possible origin of vertical cracks in the coating for which a mechanism is proposed.
 
Publisher WILEY-BLACKWELL
 
Date 2014-12-28T14:09:17Z
2014-12-28T14:09:17Z
2014
 
Type Article
 
Identifier JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 97(11)3396-3406
0002-7820
1551-2916
http://dx.doi.org/10.1111/jace.13129
http://dspace.library.iitb.ac.in/jspui/handle/100/16715
 
Language English