NDLI: Structural analysis and elastic characterization of air plasma sprayed ceria-yttria co-stabilized zirconia coatings

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Structural analysis and elastic characterization of air plasma sprayed ceria-yttria co-stabilized zirconia coatings

Content Provider	Semantic Scholar
Author	Alfano, Michela Pagnotta, Leonardo Stigliano, G. Girolamo, Giovanni Domenico Di Blasi, C.
Copyright Year	2008
Abstract	The hot sections of gas turbine engines (e.g. blades, vanes, ducts, seals and airfoils) are usually exposed to extremely hot gases which coupled to the action of oxidative and corrosive environments provide the ideal conditions for nucleation and growth of cracks. It follows that the surface temperature of these components must be maintained low enough to retain materials properties within acceptable bounds and to extend component life. From this standpoint, the most promising approach is represented by the application of ceramic thermal insulating layer which shields the substrate from the hot gas heat source. To this purpose, Air Plasma Sprayed (APS) yttria stabilized zirconia (YSZ) has been often adopted in the last decades. However, the main drawback of YSZ is represented by the phase stability at higher temperature. For this reason new alternative materials have been proposed. In particular, it has been observed that the addition of ceria to tetragonal zirconia allows to obtain ceria and yttria co-stabilized zirconia (CYSZ) which presents a higher phase stability than YSZ. The aim of the present work is the structural and elastic characterization of APS CYSZ coatings. In particular, X-Ray diffraction was used for phase analyses while the morphology and the final microstructure of the coatings were analyzed by SEM investigations. In addition, the stiffness (i.e. Young’s modulus) of CYSZ is measured by means of a resonant method applied to beam-like coated samples. Key-Words: Thermal barrier coatings, ceria-yttria stabilized zirconia, Young’s modulus, impulse excitation technique
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.wseas.us/e-library/transactions/mechanics/2007/25-620N.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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