Influence of the IR-mirror layer composition in the mechanical properties of solar selective coatings made from Mo:Si3N4 cermet

L. Álvarez-Fraga; M. A. Monclús; J. M. Molina-Aldareguía; J. A. Sánchez-García; E. Céspedes; R. Escobar-Galindo; C. Prieto

doi:10.1016/j.tsf.2014.05.069

Influence of the IR-mirror layer composition in the mechanical properties of solar selective coatings made from Mo:Si₃N₄ cermet

L. Álvarez-Fraga
, M. A. Monclús
, J. M. Molina-Aldareguía
, J. A. Sánchez-García
, E. Céspedes
, R. Escobar-Galindo
, C. Prieto^*

^*Corresponding author for this work

TECNALIA Research & Innovation

CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
Instituto IMDEA Materiales
Keele University

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Solar selective coating multilayers deposited by magnetron sputtering and containing Mo:Si₃N₄ cermet as the absorber layer and Ag as infrared reflector (IR-mirror) have shown excellent optical characteristics for concentrated solar power applications at high temperatures. However, mechanical reliability of such optical coatings is a concern due to the large thermal mismatch between the Mo:Si₃N₄ cermet and the Ag IR-mirror layer. The substitution of the Ag IR-mirror layer by a Ti/Ag bilayer can improve mechanical reliability at the operating conditions, but at the expense of deteriorating the optical properties of the solar selective coating. In this work, we study the evolution of the mechanical and optical properties of Mo:Si₃N₄/Ti/Ag solar selective coatings, as a function of the Ti/Ag ratio, with the objective of finding a compromise between the optical and mechanical properties. The substitution of Ag by Ti improves the multilayers scratch resistance without deteriorating the optical properties. As a result, we suggest an optimal composition of the Ti/Ag IR-mirror bilayer.

Original language	English
Pages (from-to)	316-320
Number of pages	5
Journal	Thin Solid Films
Volume	571
Issue number	P2
DOIs	https://doi.org/10.1016/j.tsf.2014.05.069
Publication status	Published - 28 Nov 2014

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

IR-mirror layers mechanical properties of CSP coatings
Solar selective coatings

Access to Document

10.1016/j.tsf.2014.05.069

Cite this

@article{625d4da2822747d6ade6f480366dca0c,

title = "Influence of the IR-mirror layer composition in the mechanical properties of solar selective coatings made from Mo:Si3N4 cermet",

abstract = "Solar selective coating multilayers deposited by magnetron sputtering and containing Mo:Si3N4 cermet as the absorber layer and Ag as infrared reflector (IR-mirror) have shown excellent optical characteristics for concentrated solar power applications at high temperatures. However, mechanical reliability of such optical coatings is a concern due to the large thermal mismatch between the Mo:Si3N4 cermet and the Ag IR-mirror layer. The substitution of the Ag IR-mirror layer by a Ti/Ag bilayer can improve mechanical reliability at the operating conditions, but at the expense of deteriorating the optical properties of the solar selective coating. In this work, we study the evolution of the mechanical and optical properties of Mo:Si3N4/Ti/Ag solar selective coatings, as a function of the Ti/Ag ratio, with the objective of finding a compromise between the optical and mechanical properties. The substitution of Ag by Ti improves the multilayers scratch resistance without deteriorating the optical properties. As a result, we suggest an optimal composition of the Ti/Ag IR-mirror bilayer.",

keywords = "IR-mirror layers mechanical properties of CSP coatings, Solar selective coatings",

author = "L. {\'A}lvarez-Fraga and Moncl{\'u}s, \{M. A.\} and Molina-Aldaregu{\'i}a, \{J. M.\} and S{\'a}nchez-Garc{\'i}a, \{J. A.\} and E. C{\'e}spedes and R. Escobar-Galindo and C. Prieto",

note = "Publisher Copyright: {\textcopyright} 2014 Elsevier B.V.",

year = "2014",

month = nov,

day = "28",

doi = "10.1016/j.tsf.2014.05.069",

language = "English",

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T1 - Influence of the IR-mirror layer composition in the mechanical properties of solar selective coatings made from Mo:Si3N4 cermet

AU - Álvarez-Fraga, L.

AU - Monclús, M. A.

AU - Molina-Aldareguía, J. M.

AU - Sánchez-García, J. A.

AU - Céspedes, E.

AU - Escobar-Galindo, R.

AU - Prieto, C.

PY - 2014/11/28

Y1 - 2014/11/28

N2 - Solar selective coating multilayers deposited by magnetron sputtering and containing Mo:Si3N4 cermet as the absorber layer and Ag as infrared reflector (IR-mirror) have shown excellent optical characteristics for concentrated solar power applications at high temperatures. However, mechanical reliability of such optical coatings is a concern due to the large thermal mismatch between the Mo:Si3N4 cermet and the Ag IR-mirror layer. The substitution of the Ag IR-mirror layer by a Ti/Ag bilayer can improve mechanical reliability at the operating conditions, but at the expense of deteriorating the optical properties of the solar selective coating. In this work, we study the evolution of the mechanical and optical properties of Mo:Si3N4/Ti/Ag solar selective coatings, as a function of the Ti/Ag ratio, with the objective of finding a compromise between the optical and mechanical properties. The substitution of Ag by Ti improves the multilayers scratch resistance without deteriorating the optical properties. As a result, we suggest an optimal composition of the Ti/Ag IR-mirror bilayer.

AB - Solar selective coating multilayers deposited by magnetron sputtering and containing Mo:Si3N4 cermet as the absorber layer and Ag as infrared reflector (IR-mirror) have shown excellent optical characteristics for concentrated solar power applications at high temperatures. However, mechanical reliability of such optical coatings is a concern due to the large thermal mismatch between the Mo:Si3N4 cermet and the Ag IR-mirror layer. The substitution of the Ag IR-mirror layer by a Ti/Ag bilayer can improve mechanical reliability at the operating conditions, but at the expense of deteriorating the optical properties of the solar selective coating. In this work, we study the evolution of the mechanical and optical properties of Mo:Si3N4/Ti/Ag solar selective coatings, as a function of the Ti/Ag ratio, with the objective of finding a compromise between the optical and mechanical properties. The substitution of Ag by Ti improves the multilayers scratch resistance without deteriorating the optical properties. As a result, we suggest an optimal composition of the Ti/Ag IR-mirror bilayer.

KW - IR-mirror layers mechanical properties of CSP coatings

KW - Solar selective coatings

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