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Microstructural, mechanical and tribological properties of nanostructured YSZ coatings produced with different APS process parameters

TitoloMicrostructural, mechanical and tribological properties of nanostructured YSZ coatings produced with different APS process parameters
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2015
AutoriLamuta, C., Di Girolamo G., and Pagnotta L.
RivistaCeramics International
Volume41
Paginazione8904-8914
ISSN02728842
Parole chiaveBi-modal microstructures, Ceramic coatings, Elastic moduli, Functional characteristics, hardness, Indentation, Mechanical and tribological properties, Mechanical properties, Microstructure, Nanostructured particles, Nanostructures, nanotechnology, Plasma jets, Plasma spraying, Plasma-sprayed ceramic coatings, Scanning electron microscopy, Sprayed coatings, Technological solution, Thermal barrier coatings, Tribology, Wear resistance, Young's Modulus, Yttria stabilized zirconia, Yttria-stabilized zirconias (YSZ), Zirconia
Abstract

Plasma sprayed ceramic coatings can be used in turbine engines as thermal barrier or abradable coatings, in order to improve the durability of the components as well as the efficiency. The presence of nanostructures, deriving from partial melting of agglomerated nanostructured particles, represents an interesting technological solution in order to improve their functional characteristics. In this work nanostructured yttria stabilized zirconia (YSZ) coatings were deposited by air plasma spraying (APS). The influence of the main process parameters on their microstructural, mechanical and tribological properties was investigated by scanning electron microscopy (SEM), indentation techniques at micro- and nano-scale and wear tests, respectively. Their porous microstructure was composed of well melted overlapped splats and partially melted nanostructured areas. This bimodal microstructure led to a bimodal distribution of the mechanical properties. An increase of plasma power and spraying distance was able to produce denser coatings, with lower content of embedded nanostructures, which exhibited higher elastic modulus and hardness as well as lower wear rate. © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84929270382&doi=10.1016%2fj.ceramint.2015.03.148&partnerID=40&md5=a51dfc7d4a8a6df5d78e896a9b1874a2
DOI10.1016/j.ceramint.2015.03.148
Citation KeyLamuta20158904