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Characterization of corrosion resistance of C/C–SiC Composite in molten chloride mixture MgCl2/NaCl/KCl at 700 °C

Ding, Wenjin and Shi, Yuan and Kessel, Fiona and Koch, Dietmar and Bauer, Thomas (2019) Characterization of corrosion resistance of C/C–SiC Composite in molten chloride mixture MgCl2/NaCl/KCl at 700 °C. npj Materials Degradation, 3 (42), pp. 1-9. Nature Publishing Group. DOI: 10.1038/s41529-019-0104-3 ISSN 2397-2106

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Official URL: https://www.nature.com/articles/s41529-019-0104-3#citeas

Abstract

Due to their high thermal stability and low cost, molten chlorides are promising high-temperature fluids for example for Thermal Energy Storage (TES) and Heat Transfer Fluid (HTF) materials in Concentrated Solar Power (CSP) plants and other applications. However, the commercial application of molten chlorides is strongly limited due to their strong corrosivity against commercial alloys at high temperatures. The work addresses on a fundamental level whether carbon based composite-ceramics could be potentially utilized for some corrosion critical components. Liquid Silicon Infiltration (LSI) based carbon fiber reinforced silicon carbide (called C/C-SiC) composite is immersed in a molten chloride salt (MgCl2/NaCl/KCl 60/20/20 mole %) at 700 °C for 500 h under argon atmosphere. The material properties and microstructure of the C/C-SiC composite with and without exposure in the molten chloride salt have been investigated through mechanical testing and analysis with Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray (EDX) scanning. The results reveal that the C/C-SiC composite maintains its mechanical properties after exposure in the strongly corrosive molten chloride salt. The oxidizing impurities in the molten salt react only with residual elemental silicon (Si) in the area of the C/C-SiC matrix. In comparison, no indication of reaction between the molten chloride salt and carbon fiber or SiC in the matrix is observed. In conclusion, the investigated C/C-SiC composite has a sound application potential as a structural material for high-temperature TES and HTF with molten chlorides due to its excellent corrosion resistance and favourable mechanical properties at high temperatures.

Item URL in elib:https://elib.dlr.de/133129/
Document Type:Article
Title:Characterization of corrosion resistance of C/C–SiC Composite in molten chloride mixture MgCl2/NaCl/KCl at 700 °C
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ding, WenjinWenjin.Ding (at) dlr.deUNSPECIFIED
Shi, Yuanyuan.shi (at) dlr.dehttps://orcid.org/0000-0002-4210-9069
Kessel, FionaFiona.Kessel (at) dlr.deUNSPECIFIED
Koch, DietmarDietmar.Koch (at) dlr.dehttps://orcid.org/0000-0003-4504-8721
Bauer, ThomasThomas.Bauer (at) dlr.deUNSPECIFIED
Date:19 December 2019
Journal or Publication Title:npj Materials Degradation
Refereed publication:No
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:No
In ISI Web of Science:No
Volume:3
DOI :10.1038/s41529-019-0104-3
Page Range:pp. 1-9
Publisher:Nature Publishing Group
ISSN:2397-2106
Status:Published
Keywords:Carbon fiber reinforced silicon carbide (C/C-SiC) composite, corrosion resistance, mechanical properties, microstructure, molten salts, thermal energy storage (TES).
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage), L - Structures and Materials
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:02 Jan 2020 11:10
Last Modified:02 Jan 2020 11:10

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