Ni-Al2O3 selective cermet coatings for photothermal conversion up to 500°C

T. Stephen Sathiaraj, R. Thangaraj, H. Al Sharbaty, M. Bhatnagar, O. P. Agnihotri

Research output: Contribution to journalArticle

30 Citations (Scopus)

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 α = 0.94 and ε(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.

Original languageEnglish
Pages (from-to)241-254
Number of pages14
JournalThin Solid Films
Volume190
Issue number2
DOIs
Publication statusPublished - Sep 15 1989

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

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