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Improved Performance of Ceramic Solar Absorber Particles Coated with Black Oxide Pigment Deposited by Resonant Acoustic Mixing and Reaction Sintering

Alkan, Gözde and Mechnich, Peter and Pernpeintner, Johannes (2022) Improved Performance of Ceramic Solar Absorber Particles Coated with Black Oxide Pigment Deposited by Resonant Acoustic Mixing and Reaction Sintering. Coatings, 2022 (12), p. 757. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/coatings12060757. ISSN 2079-6412.

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Abstract

Spherical particles based on bauxite-type raw materials, commonly referred to as proppants, are state-of-the-art for particle receivers of concentrated solar power plants. Particles are heated in a fluidized reactor by focused sunlight and are transported to a heat-exchanger or a storage tank. Therefore, key properties for absorber particles are high solar absorptance and mechanical endurance. Due to their relatively poor content of color-giving transition-metal cations, bauxite-derived proppants show limited solar absorptance, which is even deteriorating by long-term heat exposure. A deep-black Cu, Mn, Fe- pigment with a spinel structure was employed to coat standard proppants in order to improve solar absorptance. The coating process was performed by high-energy, high-speed mixing of proppants and small quantities of spinel powders in a resonant acoustic mixer. A continuous powder coating is achieved by electrostatic attraction between the proppant surface and the coating particles. Consolidation and strong attachment of the coating is achieved by the subsequent sintering beyond the spinel melting temperature. Chemical reaction and bonding between spinel coating and proppant lead to the incorporation of Al, Mg and Ti into the spinel structure. Coated bauxite proppants exhibit a significantly improved, long-term stable solar absorption accompanied by a promising abrasion resistance. The presented coating methodology is considered to be scalable to industrial production.

Item URL in elib:https://elib.dlr.de/190783/
Document Type:Article
Title:Improved Performance of Ceramic Solar Absorber Particles Coated with Black Oxide Pigment Deposited by Resonant Acoustic Mixing and Reaction Sintering
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Alkan, GözdeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mechnich, PeterUNSPECIFIEDhttps://orcid.org/0000-0003-4689-8197UNSPECIFIED
Pernpeintner, JohannesUNSPECIFIEDhttps://orcid.org/0000-0003-4895-6135UNSPECIFIED
Date:May 2022
Journal or Publication Title:Coatings
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:2022
DOI:10.3390/coatings12060757
Page Range:p. 757
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2079-6412
Status:Published
Keywords:solid particle technology, absorptance, bauxite proppants, spinel coating
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
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional ceramics
Institute of Solar Research > Qualifizierung
Deposited By: Mechnich, Dr.rer.nat. Peter
Deposited On:28 Nov 2022 08:03
Last Modified:28 Nov 2022 08:03

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