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High Temperature Interaction of Volcanic Ashes with 7YSZ TBC´s produced by APS: Infiltration behavior and phase stability

Rivera-Gil, Marco A and Gomez Chavez, Juan J and Ramana, C.V. and Naraparaju, Ravisankar and Schulz, Uwe and Muñoz-Saldaña, J. (2019) High Temperature Interaction of Volcanic Ashes with 7YSZ TBC´s produced by APS: Infiltration behavior and phase stability. Surface and Coatings Technology, 378. Elsevier. doi: 10.1016/j.surfcoat.2019.124915. ISSN 0257-8972.

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High-temperature infiltration behavior and phase stability of yttria-stabilized zirconia (7YSZ) thermal barrier coatings (TBC) produced by atmospheric plasma spray interacting with volcanic ashes (VAs) are presented here. Three VAs from the Colima, Popocatepetl, and Eyjafjallajökull volcanoes have been used in this work. Previous to infiltration experiments, physicochemical characterization of the VAs was carried out including thermal analyses by DSC, structural studies by XRD, and ICP chemical composition measurements. TBCs’ infiltration tests were carried out at 1250 °C for different times. Results showed that infiltration depth as a function of time behaves in a non-linear way. Mainly two important infiltration behaviors were identified corresponding to high- and slow-speed infiltration regimes. Higher infiltration kinetics was detected for VAs with lower SiO2 content. The extent of chemical degradation of the 7YSZ is directly related to the silica content. For greater SiO2 values, a higher content of monoclinic ZrO2 was observed leading to maximum values at intermediate annealing times between 2 and 5 h. This behavior can be correlated with the high-speed tetragonal to monoclinic ZrO2 transformation at short times (between 2 and 5 h) until a maximum monoclinic content is reached. After that, the reaction follows by the interplay of ZrSiO4 formation at the expense of previously formed m-ZrO2 together with the incorporation of Y and Zr to the glass melt.

Item URL in elib:https://elib.dlr.de/130211/
Document Type:Article
Title:High Temperature Interaction of Volcanic Ashes with 7YSZ TBC´s produced by APS: Infiltration behavior and phase stability
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gomez Chavez, Juan Jjjgomez2 (at) miners.utep.eduUNSPECIFIED
Ramana, C.V.rvchintalapalle (at) utep.eduUNSPECIFIED
Naraparaju, RavisankarRavisankar.Naraparaju (at) dlr.deUNSPECIFIED
Schulz, UweUwe.Schulz (at) dlr.dehttps://orcid.org/0000-0003-0362-8103
Muñoz-Saldaña, J.Centro de Investigación y de Estudios Avanzados del IPN, Unidad Querétaro, Libramiento Norponiente No. 2000, Fracc. Real de Juriquilla, C.P. 76230 Querétaro, Querétaro, MéxicoUNSPECIFIED
Date:19 August 2019
Journal or Publication Title:Surface and Coatings Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.surfcoat.2019.124915
Keywords:TBC, Atmospheric Plasma Spray, YSZ, Volcanic Ashes, Infiltration, High Temperature
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Naraparaju, Dr Ravisankar
Deposited On:11 Nov 2019 18:16
Last Modified:01 Jul 2021 03:00

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