Alternative low-power plasma-sprayed inconel 625 coatings for thermal solar receivers: Effects of high temperature exposure on adhesion and solar absorptivity
Fecha
2022
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Editor
Elsevier
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Resumen
Over recent years, renewable energy technologies have focused on increasing performance and efficiency, and on
the reduction of maintenance costs. In this work, thermal-sprayed Inconel 625 coatings have been studied as an
alternative for concentrated solar power plants receivers. A low-power compact plasma spray system was used to
deposit coatings onto two substrates: grade 22 ferritic steel and AISI 316 L austenitic steel. This system may be
used for in-situ maintenance or repair purposes. The coatings were heat-treated at two temperatures: 520 ◦C and
800 ◦C, at different exposure times. The aim of this work was to evaluate the effect of this treatment on the
adherence and solar absorptivity of the Inconel 625 coatings. The results showed that, at higher temperatures
and longer exposure times, better adherence and absorptivity are achieved. Adherence values above 60 MPa
were obtained due to diffusion in the coating-substrate interface. Additionally, absorptivity values above 93%
were measured due to oxide formation on the coating surface during heat treatment. Furthermore, the highest
temperature of the oxidized treatment reported the highest values of absorptivity. These results show that the
developed Inconel 625 coatings could be considered as a possible alternative to improve the performance of
concentrated solar power plants.
Descripción
The authors wish to thank to “Comunidad de Madrid” and European Structural Funds for their financial support of ACES2030-CM project (S2018/EMT-4319). The authors also acknowledge financial support received from the Spanish government AEI under Grant No. PID2020-115508RB-C22 (A3M).
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Citación
David Merino-Millan, Claudio J. Múnez, Miguel Ángel Garrido-Maneiro, Pedro Poza, Alternative low-power plasma-sprayed inconel 625 coatings for thermal solar receivers: Effects of high temperature exposure on adhesion and solar absorptivity, Solar Energy Materials and Solar Cells, Volume 245, 2022, 111839, ISSN 0927-0248, https://doi.org/10.1016/j.solmat.2022.111839
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