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

Enea-Ente Per Le Nuove Tecnologie, L'energia E L'ambiente

Maria Luisa Addonizio

Antonio Guglielmo

Salvatore Esposito

Alessandro Antonaia

Sabato Aprea

Giuseppe Nobile

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.

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Portici, Italy

Maria Luisa Addonizio