Abstract
Multilayer coatings have been modelled and prepared experimentally for optical and mechanical properties for solar reflector applications on ceramic substrate. Aluminium thin films are ideally suited for reflector. This value of reflection is reduced reasonably by integrating multilayer thin films based on dielectric materials, behaving as bond and protective layer, aluminium thin films in combination with alumina coatings are also suitable for solar reflector coatings, aluminium thin films were coated on ceramic substrate using DC magnetron sputtering process in argon atmosphere. The effect of thickness of bond layer and protective layers on aluminium coatings of 400nm are characterized for optical and mechanical and properties has been presented in this paper. Multilayer coatings deposited with substrate temperature at RT with coating thickness of (100nm) Al2O3 as bond layer and protective layer as lower surface roughness (Ra<6nm) compared to the coating deposited with coating thickness of (300nm) Al2O3 with aluminium as reflective layer, as a result the coating had a hardness of 7 GPa, while that of pure aluminium deposited at RT with coating thickness of (100nm) Al2O3 as bond layer and protective layer had a hardness of 4.5 GPa. The simulation and experimental responses of multilayer of aluminium thin films deposited at in the wavelength range of 250-1500 nm were similar.
Published Version
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