Fabrication of surface microstructures based on spinodal decomposition for high-temperature solar selective absorbers

Makoto Shimizu, Toshiro Abe, Fumitada Iguchi, Hiroo Yugami

Research output: Contribution to journalConference articlepeer-review


Making periodically aligned microstructures with sub-micron size on a refractory metal is one of the promising technologies of increasing solar absorption selectively at high-temperature condition. However, the technique of fabricating microstructures for refractory metal is limited, such as using semiconductor technologies. Therefore, the large-area fabrication of microstructures on refractory metals is a key technology supporting the practical application of controlling optical property using surface microstructures. This report describes large-area fabrication of two-dimensional submicron quasi-periodic microstructures using spinodal decomposition on a nickel-based superalloy. The surface microstructures were obtained only by appropriate heat treatments and simple chemical etching process. The size of microstructure; i.e. depth, width, can be controlled with heat treatment conditions and etching time. Solar selective absorptance of 0.82 and hemispherical total emittance of 0.31 at 600oC can be obtained with the proper treatments.

Original languageEnglish
Pages (from-to)7689-7694
Number of pages6
JournalInternational Heat Transfer Conference
Publication statusPublished - 2018
Event16th International Heat Transfer Conference, IHTC 2018 - Beijing, China
Duration: 2018 Aug 102018 Aug 15


  • Microstructure
  • Ni based superalloys
  • Solar selective absorbers
  • Spinodal decomposition

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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