NDLI: An Experimental Study of Microstructure-Property Relationships in Thermal Barrier Coatings

Content Provider	Springer Nature Link
Author	Gupta, M. Dwivedi, G. Nylén, P. Vackel, A. Sampath, S.
Copyright Year	2013
Abstract	The thermal-mechanical properties of thermal barrier coatings are highly influenced by the defects present in coating microstructure. The aim of this study was to meet the future needs of the gas turbine industry by further development of zirconia coatings through the assessment of microstructure-property relationships. A design of experiments was conducted for this purpose with current, spray distance, and powder feed rate as the varied parameters. Microstructure was assessed with SEM and image analysis was used to characterize porosity content. Evaluations were carried out using laser flash technique to measure thermal properties. A bi-layer beam curvature technique in conjunction with controlled thermal cycling was used to assess the mechanical properties, in particular their nonlinear elastic response. Coating lifetime was evaluated by thermo-cyclic fatigue testing. Relationships between microstructure and coating properties are discussed. Dense vertically cracked microstructure and highly porous microstructure with large globular pores were also fabricated. Correlations between parameters obtained from nonlinear measurements and lifetime based on a priori established microstructural analysis were attempted in an effort to develop and identify a simplified strategy to assess coating durability following sustained long-term exposure to high temperature thermal cycling.
Starting Page	659
Ending Page	670
Page Count	12
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	22
Issue Number	5
e-ISSN	15441016
Language	English
Publisher	Springer US
Publisher Date	2013-03-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	design lifetime microstructure nonlinear degree thermal barrier coatings thermal conductivity Young’s modulus Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings Characterization and Evaluation of Materials Operating Procedures, Materials Treatment Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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