TY - JOUR
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.
N1 - Publisher Copyright:
© 2014 Elsevier B.V.
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
UR - http://www.scopus.com/inward/record.url?scp=84919875684&partnerID=8YFLogxK
U2 - 10.1016/j.tsf.2014.05.069
DO - 10.1016/j.tsf.2014.05.069
M3 - Article
AN - SCOPUS:84919875684
SN - 0040-6090
VL - 571
SP - 316
EP - 320
JO - Thin Solid Films
JF - Thin Solid Films
IS - P2
ER -
