Ni-Al2O3 selective cermet coatings for photothermal conversion up to 500°C |
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Authors: | TStephen Sathiaraj R Thangaraj H Al Sharbaty M Bhatnagar OP Agnihotri |
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Affiliation: | Physics Department, Indian Institute of Technology, New Delhi 110016, India |
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Abstract: | Spectrally selective Ni-Al2O3 composite films were prepared by r.f. planar magnetron sputtering using hot-pressed targets of two different compositions. The composition of the films were varied by co-sputtering the target with additional nickel pellets distributed uniformly on the target. The composition of the films were analysed by energy-dispersive X-ray analysis. Optical simulations were carried out with the experimentally measured n and k and the published n and k of the metallic substrate. R.f.-sputtered SiO2 and Al2O3 were used as antireflection coatings. From the computer optimization studies we found that = 0.94 and (100°C) = 0.07 could be obtained with 650 Å of Ni-Al2O3 (f = 0.61) antireflected with 780 Å SiO2 on a nickel-coated glass substrate. When molybdenum-coated nickel-plated stainless steel substrates were used, the films were found to be stable up to 500°C in air. |
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