Surface roughness and thermal stability of graded cermet photothermal absorber coatings with very high absorptivities

Glen A. Nyberg, Harold G. Craighead, R. A. Buhrman

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

MoAl2O3 and PtAl2O3 cermet coatings can be roughend by the use of a high substrate temperature during deposition. This effect can be used to raise significantly the efficiency of graded-index photothermal absorbers made from these coatings. Roughness lowers the stability in air of MoAl2O3 absorbers but has little effect on vacuum stability. The stability in air of PtAl2O3 absorbers is little affected by roughness. Thus roughened PtAl2O3 (MoAl2O3) absorbers seem to be extremely well suited for in-air (evaluated) collector applications operating at high temperatures and under a high concentrations of solar flux.

Original languageEnglish (US)
Pages (from-to)185-190
Number of pages6
JournalThin Solid Films
Volume96
Issue number2
DOIs
StatePublished - Oct 8 1982

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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