Abstract
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 language | English |
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Pages (from-to) | 7689-7694 |
Number of pages | 6 |
Journal | International Heat Transfer Conference |
Volume | 2018-August |
DOIs | |
Publication status | Published - 2018 Jan 1 |
Event | 16th International Heat Transfer Conference, IHTC 2018 - Beijing, China Duration: 2018 Aug 10 → 2018 Aug 15 |
Keywords
- Microstructure
- Ni based superalloys
- Solar selective absorbers
- Spinodal decomposition
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanical Engineering
- Fluid Flow and Transfer Processes