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Thermal properties and phase stability of Yttria-Stabilized Zirconia (YSZ) coating deposited by Air Plasma Spray onto a Ni-base superalloy

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Date
2017
Author
Zambrano D.F., Barrios A., Tobón L.E., Serna C., Gómez P., Osorio J.D., Toro A.
Zambrano, D.F., Tribology and Surfaces Group, National University of Colombia, Medellín, Colombia, Facultad de Ciencias Físicas y Matemáticas - FCFM, Universidad de Chile, Chile; Barrios, A., Tribology and Surfaces Group, National University of Colombia, Medellín, Colombia; Tobón, L.E., Tribology and Surfaces Group, National University of Colombia, Medellín, Colombia; Serna, C., Tribology and Surfaces Group, National University of Colombia, Medellín, Colombia; Gómez, P., Tribology and Surfaces Group, National University of Colombia, Medellín, Colombia, Empresas Públicas de Medellín, Medellín, Colombia; Osorio, J.D., Facultad de Ingenierías, Ingeniería en Energía, Universidad de Medellín, Medellín, Colombia; Toro, A., Tribology and Surfaces Group, National University of Colombia, Medellín, Colombia

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TY - GEN T1 - Thermal properties and phase stability of Yttria-Stabilized Zirconia (YSZ) coating deposited by Air Plasma Spray onto a Ni-base superalloy AU - Zambrano D.F., Barrios A., Tobón L.E., Serna C., Gómez P., Osorio J.D., Toro A. Y1 - 2017 UR - http://hdl.handle.net/11407/4531 PB - Elsevier Ltd AB - ER - @misc{11407_4531, author = {Zambrano D.F. Barrios A. Tobón L.E. Serna C. Gómez P. Osorio J.D. Toro A.}, title = {Thermal properties and phase stability of Yttria-Stabilized Zirconia (YSZ) coating deposited by Air Plasma Spray onto a Ni-base superalloy}, year = {2017}, abstract = {}, url = {http://hdl.handle.net/11407/4531} }RT Generic T1 Thermal properties and phase stability of Yttria-Stabilized Zirconia (YSZ) coating deposited by Air Plasma Spray onto a Ni-base superalloy A1 Zambrano D.F., Barrios A., Tobón L.E., Serna C., Gómez P., Osorio J.D., Toro A. YR 2017 LK http://hdl.handle.net/11407/4531 PB Elsevier Ltd AB OL Spanish (121)
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Abstract
Thermal properties and microstructure characterization of Yttria Stabilized Zirconia (YSZ) Thermal Barrier Coatings (TBCs) deposited by Air Plasma Spray (APS) onto a Ni-base superalloy (Inconel 625) were studied. Two separate sets of tests were performed. The first one consisted in Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA) performed over free-standing TC samples detached from TBCs. The second one included the analysis of the cross section of samples heat treated at 1100. °C with holding times of 600, 1000, and 1700. h. The TC porosity was analyzed for different heat treatment conditions so that inter-lamellar, intra-lamellar and globular pores, as well as cracks, were identified and quantified independently. An initial porosity reduction related to inter-lamellar and intra-lamellar pores, as well as cracks, was observed during the first 600. h of heat treatment, due to sintering. However, porosity continually increased during heat treatment from 600 to 1700. h driven by volumetric changes associated to phase transformations. During this period, yttrium diffused from the metastable tetragonal phase favoring the transformation to cubic phase while monoclinic phase transformed after cooling from the yttrium-depleted tetragonal phase. Energy absorption curves and the variation of heat capacity with temperature were also determined and correlated to microstructural changes. © 2017 Elsevier Ltd and Techna Group S.r.l.
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http://hdl.handle.net/11407/4531
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