Impact of Feedstock Nature on Thermal Conductivity of YSZ Thermal Barrier Coatings Obtained by Plasma Spraying

Autor: Carpio-Cobo, Pablo, Salvador Moya, Mª Dolores, Benavente Martínez, Rut, Miranda, M., Borrell Tomás, María Amparo, Sánchez, E.
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Zdroj: Repositori Universitat Jaume I
Universitat Jaume I
RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
instname
ISSN: 2015-6758
DOI: 10.4416/jcst2016-00022
Popis: [EN] Yttria-stabilized zirconia (YSZ) coatings with low thermal conductivity were obtained using three different particle size distributions as starting powder: nano-, submicron- and bimodal submicron/nano-sized particles. On the one hand, these particles were reconstituted into micrometric, spray-dry agglomerates, which were subsequently deposited by means of conventional atmospheric plasma spraying (APS). On the other hand, the starting particles were dispersed in water and the resultant suspensions were deposited by means of suspension plasma spraying (SPS). The coatings were thermally treated to assess their sintering resistance. As-sprayed and thermally treated coatings were then characterized in terms of microstructure (FEG-SEM) and thermal diffusivity (laser flash equipment). The results showed that SPS coatings exhibited extremely low thermal conductivity at low temperature which drastically augmented with increasing temperature. On the other hand, APS coatings also exhibited low thermal conductivities but their values were higher than those of the SPS coatings at the lowest temperature tested while the conductivities hardly varied with temperature.
This work has been supported by the Spanish Ministry of Economy and Competitiveness (project MAT2015-67586-C3-R) and Research Promotion Plan of the Universitat Jaume I, action 2.1 (ref. E-2011 - 05) and action 3.1 (ref. PREDOC/2009/10). A. Borrell acknowledges the Spanish Ministry of Economy and Competitiveness for her Juan de la Cierva-Incorporacion contract (IJCI-2014-19839). M. Miranda would like to thank the European Commission (FP7-Marie Curie Intra-European Fellowship, BIOHYMAT).
Databáze: OpenAIRE
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