Agenzia Nazionale Per Le Nuove Tecnologie, L'ener- Gia E Lo Sviluppo Economico Sostenibile (Enea)

Salvatore Esposito

Antonio Guglielmo

Alessandro Antonaia

Maria Luisa Addonizio

Antonio D'angelo

Giorgio Graditi

Claudia Diletto

A solar absorber coating for a receiver element of a solar thermal or thermodynamic system. An additional aspect is a receiver for solar thermal or thermodynamic systems comprising a coating. The receiver may be an evacuated receiver pipe or a non-evacuated or air-operating receiver pipe.

Spectrally selective solar absorber coating

A thin-film spectrally selective coating for receiver tube of vacuumed type for use in thermodynamic solar installations and operating both at medium temperature (up to 400&#xb0; C.) and at high temperature (up to 550&#xb0; C.), coating where the optically absorbing layer is a multilayer of cermet material of type: WN&#x2014;AlNor MoN&#x2014;AlN, material prepared with reactive co-sputtering technique from an Al target and a W or Mo target, process conducted under a transition regimen, under PFM (Plasma Emission Monitoring) or CVM (Cathode Voltage Monitoring) monitoring for the sole Al target, with inletting near the Al target of a Namount adequate for obtainment of a high-transparency, high growth rate sub-stoichiometric ceramic AlN and with inletting near the W or Mo target of a Namount adequate for obtainment of the sole WN or MoN phase, phase very stable at high temperature, such as to make the cermet material as close as possible to the formulation WN&#x2014;AlNor MoN&#x2014;AlN(with x comprised between 0.90 and 1.00, preferably 0.95) and, therefore, cermet material employable at least up to the temperature of 550&#xb0; C.

Solar selective absorber based on double nitride composite material and process for its preparation

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Naples, Italy

Salvatore Esposito