Journal
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
Volume 33, Issue 6, Pages -Publisher
A V S AMER INST PHYSICS
DOI: 10.1116/1.4935156
Keywords
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Funding
- National Science Foundation [ECS-0335765]
- Solid-State Solar-Thermal Energy Conversion Center (S3TEC), an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0001299/DE-FG02-09ER46577]
- U.S. Army Research Laboratory
- U.S. Army Research Office through the Institute for Soldier Nanotechnologies [W911NF-13-D-0001]
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Thick sputtered tantalum (Ta) coatings on polished Inconel were investigated as a potential replacement for bulk refractory metal substrates used for high-temperature emitters and absorbers in thermophotovoltaic energy conversion applications. In these applications, high-temperature stability and high reflectance of the surface in the infrared wavelength range are critical in order to sustain operational temperatures and reduce losses due to waste heat. The reflectance of the coatings (8 and 30 mu m) was characterized with a conformal protective hafnia layer as-deposited and after one hour anneals at 700, 900, and 1100 degrees C. To further understand the high-temperature performance of the coatings, the microstructural evolution was investigated as a function of annealing temperature. X-ray diffraction was used to analyze the texture and residual stress in the coatings at four reflections (220, 310, 222, and 321), as-deposited and after anneal. No significant changes in roughness, reflectance, or stress were observed. No delamination or cracking occurred, even after annealing the coatings at 1100 degrees C. Overall, the results of this study suggest that the thick Ta coatings are a promising alternative to bulk substrates and pave the way for a relatively low-cost and easily integrated platform for nanostructured devices in high-temperature energy conversion applications. (C) 2015 American Vacuum Society.
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