DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Cr–Mn-diffusion coatings on VM12: In situ spinel formation with high solar absorptance for concentrated solar plants

Ulrich, A.S. and Schlereth, Clara and Gregoire, Benjamin and Sutter, Florian and Oskay, Ceyhun and Hildebrandt, C. and Galetz, M.C. (2023) Cr–Mn-diffusion coatings on VM12: In situ spinel formation with high solar absorptance for concentrated solar plants. Solar Energy Materials and Solar Cells, 257 (112382). Elsevier. doi: 10.1016/j.solmat.2023.112382. ISSN 0927-0248.

Full text not available from this repository.


Receiver systems in concentrated solar power plants have to withstand harsh desert conditions and high temperatures, while maintaining high efficiencies converting solar radiation to thermal energy within a heat transfer fluid. The need to improve high absorbing receiver coatings with respect to their lifetime is essential to enhance the economic efficiency of such plants. Diffusion coatings based on Cr and Mn are shown to provide intrinsic selfhealing properties forming black Cr–Mn-oxides in situ. Oxidation tests in air are conducted at temperatures between 527 and 710 ◦C up to 100 h. Thereby, solar absorptances up to 93% and optical coatings efficiencies up to 80% are obtained on coated VM12 steel with the best coating performance shown at around 650 ◦C. Thermocyclic oxidation for up to 640 h at a maximum temperature of 650 ◦C proves that there is a slight drop in solar absorptance after around 50 h of exposure, but afterwards it remains stable. Additionally, it is found that coated VM12 performs better in comparison to P91 steel. A mechanism of oxide formation and coating consumption is proposed showing the importance of Mn diffusion on oxide formation. In the beginning of the exposure, Mn2O3 and cubic MnxCr3-xO4 (β-spinel) form, which transform to tetragonal MnxCr3-xO4 (α-spinel) and with continuing exposure also to Cr2O3. For analysis, metallographic investigations are combined with methods such as Ramanspectroscopy, XRD, spectrophotometry, qualitative and quantitative EPMA measurements.

Item URL in elib:https://elib.dlr.de/195251/
Document Type:Article
Title:Cr–Mn-diffusion coatings on VM12: In situ spinel formation with high solar absorptance for concentrated solar plants
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Ulrich, A.S.Dechema FoschungsinstitutUNSPECIFIEDUNSPECIFIED
Schlereth, ClaraDechema FoschungsinstitutUNSPECIFIEDUNSPECIFIED
Gregoire, BenjaminDechema ForschungsinstitutUNSPECIFIEDUNSPECIFIED
Sutter, FlorianUNSPECIFIEDhttps://orcid.org/0000-0002-2981-5807UNSPECIFIED
Oskay, CeyhunDechema FoschungsinstitutUNSPECIFIEDUNSPECIFIED
Galetz, M.C.Dechema FoschungsinstitutUNSPECIFIEDUNSPECIFIED
Date:24 May 2023
Journal or Publication Title:Solar Energy Materials and Solar Cells
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Concentrated solar power (CSP), Ferritic-martensitic steel, Diffusion coatings, Solar absorptance, Oxide scales, Thermal emittance
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 SW - Solar and Wind Energy
DLR - Research theme (Project):E - Condition Monitoring
Location: other
Institutes and Institutions:Institute of Solar Research
Deposited By: Sutter, Florian
Deposited On:16 Jun 2023 11:06
Last Modified:16 Jun 2023 11:06

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.