Nanostructured yttria stabilized zirconia (YSZ) coatings were deposited by Atmospheric Plasma Spraying (APS). X-ray diffraction (XRD) was used to investigate their phase composition, while scanning electron microscopy (SEM) was employed to examine their microstructure. The coatings showed a unique and complex microstructure composed of well-melted splats with columnar crystal structure, partially melted areas, which resembled the morphology of the powder feedstock, and equiaxed grains. Vickers microhardness of nanostructured zirconia coatings was similar to that of the conventional ones and strongly depended on the indentation load. Otherwise, a higher thermal shock resistance was found. This effect was addressed to the retention of nanostructured areas in coating microstructure and to the corresponding high porosity. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Microstructure, mechanical properties and thermal shock resistance of plasma sprayed nanostructured zirconia coatings / G., Di Girolamo; Marra, Francesco; C., Blasi; E., Serra; Valente, Teodoro. - In: CERAMICS INTERNATIONAL. - ISSN 0272-8842. - STAMPA. - 37:7(2011), pp. 2711-2717. [10.1016/j.ceramint.2011.04.024]

Microstructure, mechanical properties and thermal shock resistance of plasma sprayed nanostructured zirconia coatings

MARRA, FRANCESCO;VALENTE, Teodoro
2011

Abstract

Nanostructured yttria stabilized zirconia (YSZ) coatings were deposited by Atmospheric Plasma Spraying (APS). X-ray diffraction (XRD) was used to investigate their phase composition, while scanning electron microscopy (SEM) was employed to examine their microstructure. The coatings showed a unique and complex microstructure composed of well-melted splats with columnar crystal structure, partially melted areas, which resembled the morphology of the powder feedstock, and equiaxed grains. Vickers microhardness of nanostructured zirconia coatings was similar to that of the conventional ones and strongly depended on the indentation load. Otherwise, a higher thermal shock resistance was found. This effect was addressed to the retention of nanostructured areas in coating microstructure and to the corresponding high porosity. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
2011
c. hardness; c. thermal shock resistance; d. zro2; e. thermal applications; hardness; plasma spraying; thermal applications; thermal shock resistance; zro2
01 Pubblicazione su rivista::01a Articolo in rivista
Microstructure, mechanical properties and thermal shock resistance of plasma sprayed nanostructured zirconia coatings / G., Di Girolamo; Marra, Francesco; C., Blasi; E., Serra; Valente, Teodoro. - In: CERAMICS INTERNATIONAL. - ISSN 0272-8842. - STAMPA. - 37:7(2011), pp. 2711-2717. [10.1016/j.ceramint.2011.04.024]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/402299
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