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Compatibility of 3D-Printed Oxide Ceramics with Molten Chloride Salts for High-Temperature Thermal Energy Storage in Next-Generation CSP Plants

Ding, Wenjin and Shi, Yuan and Braun, Markus and Kessel, Fiona and Friess, Martin and Bonk, Alexander and Bauer, Thomas (2021) Compatibility of 3D-Printed Oxide Ceramics with Molten Chloride Salts for High-Temperature Thermal Energy Storage in Next-Generation CSP Plants. Energies, 14 (2599). Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/en14092599. ISSN 1996-1073.

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Official URL: https://www.mdpi.com/1996-1073/14/9/2599

Abstract

Oxide ceramics could be attractive high-temperature construction materials for critical structural parts in high-temperature molten salt thermal energy storage systems due to their excellent corro-sion resistance and good mechanical properties. The 3D-printing technology allows the produc-tion of ceramic components with highly complex geometries, and therefore extends their applica-tions. In this work, 3D-printed ZrO2 and Al2O3 ceramics were immersed in molten MgCl2/KCl/NaCl under argon or exposed in argon without molten chlorides at 700 °C for 600 h. Their material properties and microstructure were investigated through three-point-bend (3PB) testing and material analysis with SEM-EDX and XRD. The results show that the 3D-printed Al2O3 maintained its mechanical property after exposure in the strongly corrosive molten chloride salt. The 3D-printed ZrO2 had an enhanced 3PB strength after molten salt exposure, whereas no change was observed after exposure in argon at 700 °C. The material analysis shows that some of the ZrO2 on the sample surface changed its crystal structure and shape (T→M phase transfor-mation) after molten salt exposure, which could be the reason for the enhanced 3PB strength. The thermodynamic calculation shows that the T→M transformation could be caused by the reaction of the Y2O3-stabilized ZrO2 with MgCl2 (mainly Y2O3 and ZrO2 with gaseous MgCl2). In conclu-sion, the 3D-printed ZrO2 and Al2O3 ceramics have excellent compatibility with corrosive molten chlorides at high temperatures and thus show a sound application potential as construction mate-rials for molten chlorides.

Item URL in elib:https://elib.dlr.de/142257/
Document Type:Article
Title:Compatibility of 3D-Printed Oxide Ceramics with Molten Chloride Salts for High-Temperature Thermal Energy Storage in Next-Generation CSP Plants
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ding, WenjinWenjin.Ding (at) dlr.deUNSPECIFIED
Shi, Yuanyuan.shi (at) dlr.dehttps://orcid.org/0000-0002-4210-9069
Braun, Markusmar.braun (at) dlr.deUNSPECIFIED
Kessel, FionaFiona.Kessel (at) dlr.deUNSPECIFIED
Friess, MartinMartin.Friess (at) dlr.deUNSPECIFIED
Bonk, AlexanderAlexander.Bonk (at) dlr.deUNSPECIFIED
Bauer, ThomasThomas.Bauer (at) dlr.deUNSPECIFIED
Date:1 May 2021
Journal or Publication Title:Energies
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:14
DOI :10.3390/en14092599
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:1996-1073
Status:Published
Keywords:concentrated solar power (CSP); 3D-printed ZrO2 and Al2O3 ceramics; three-point-bend strength (3PB strength); corrosion resistance; molten salt
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Materials for High-Temperature Thermal Technologies, E - Advanced Heat Transfer Media, E - Thermochemical Processes
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Institute of Structures and Design > Ceramic Composite Structures
Deposited By: Ding, Wenjin
Deposited On:12 May 2021 09:42
Last Modified:17 May 2021 09:19

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