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Forty Shades of Black: a Benchmark of High Temperature Sprayable Black Coatings Applied on Haynes 230

Caron, Simon and Garrido, Jorge and Setien, Eneko and Noc, Luca and Röger, Marc and Sutter, Florian (2019) Forty Shades of Black: a Benchmark of High Temperature Sprayable Black Coatings Applied on Haynes 230. SolarPACES Conference 2019, 1. -4. October 2019, Daegu, South Corea. (Submitted)

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The solar receiver coating opto-thermal efficiency has a significant impact on a central receiver system thermal final system efficiency. The development of durable high solar absorptance coatings with simple application process and minimal thermal treatment can directly improve the receiver efficiency, thus reducing the levelized cost of electricity. During the past years, innovative receiver coatings for solar thermal tower plants have been developed on various substrates and tested under isothermal load at different temperature levels. In this paper, eight commercial black coating formulations are sprayed on Haynes 230 metal coupons. Solar absorptance and thermal emittance are monitored before and after isothermal exposure. Mass deviations are also measured to pinpoint any oxidation or coating outgassing. Isothermal testing is performed in laboratory muffle furnace for 1000 hours, covering the operating temperature range from 700 to 800 °C. After 1000 hours exposure at 800 °C, Pyromark 2500 leads the benchmark, while many black coatings degrade optically. Uncoated samples oxidize significantly and appear darker than some aged black coatings.

Item URL in elib:https://elib.dlr.de/130855/
Document Type:Conference or Workshop Item (Speech)
Title:Forty Shades of Black: a Benchmark of High Temperature Sprayable Black Coatings Applied on Haynes 230
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Caron, SimonSimon.Caron (at) dlr.dehttps://orcid.org/0000-0002-7699-8108
Garrido, JorgeKTH Royal Institute of TechnologyUNSPECIFIED
Noc, LucaNational Institute of Chemistry SloveniaUNSPECIFIED
Röger, MarcMarc.Roeger (at) dlr.dehttps://orcid.org/0000-0003-0618-4253
Sutter, FlorianFlorian.Sutter (at) dlr.dehttps://orcid.org/0000-0002-2981-5807
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:solar Receiver coating, oxidization
Event Title:SolarPACES Conference 2019
Event Location:Daegu, South Corea
Event Type:international Conference
Event Dates:1. -4. October 2019
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Impact of Desert Environment
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualification
Deposited By: Kruschinski, Anja
Deposited On:20 Nov 2019 15:19
Last Modified:20 Nov 2019 15:19

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