Efficiency and behavior of textured high emissivity metallic coatings at high temperature
| Autor: | Etienne Brodu, Marianne Balat-Pichelin, J.-L. Sans, Mark D. Freeman, Justin C. Kasper |
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| Přispěvatelé: | Procédés, Matériaux et Energie Solaire (PROMES), Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS), Harvard-Smithsonian Center for Astrophysics (CfA), Smithsonian Institution-Harvard University [Cambridge] |
| Rok vydání: | 2015 |
| Předmět: |
Materials science
chemistry.chemical_element Surface finish engineering.material Tungsten 7. Clean energy [SPI.MAT]Engineering Sciences [physics]/Materials Low emissivity Optics Coating Operating temperature lcsh:TA401-492 Surface roughness Emissivity General Materials Science Composite material ComputingMilieux_MISCELLANEOUS business.industry Mechanical Engineering Atmospheric temperature range [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] chemistry 13. Climate action Mechanics of Materials [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic engineering lcsh:Materials of engineering and construction. Mechanics of materials business |
| Zdroj: | Materials & Design, Vol 83, Iss, Pp 85-94 (2015) Materials and Design Materials and Design, Elsevier, 2015, 83, pp.85-94. ⟨10.1016/j.matdes.2015.05.073⟩ |
| ISSN: | 0264-1275 |
| DOI: | 10.1016/j.matdes.2015.05.073 |
| Popis: | Three metallic coatings with textured surfaces, made of rhenium, tungsten and molybdenum, were studied in the frame of the Solar Probe Plus mission (NASA) as candidate materials. The role of these coatings is to dissipate a maximum of energy from a hot instrument facing the Sun, by the mean of their high total hemispherical emissivity. The total hemispherical emissivity of the three coatings was measured in the temperature range 1100–1900 K, as well as over time in order to study their high temperature stability. Various emissivity levels were obtained depending on the surface texture. The highest total hemispherical emissivity was obtained on a rhenium coating, with an emissivity of 0.8 in the temperature range 1300–1700 K. However, this rhenium coating with a fine, sharp surface texture, presented an instability at high temperature, which might limit its optimal operating temperature to about 1500 K. As for the tungsten coating, the total hemispherical emissivity was increased by a factor 2 due to the enhanced surface texturation and its great stability over the whole temperature range was shown. Keywords: Emissivity, Metallic coating, Refractory metal, Surface texturing, Surface roughness |
| Databáze: | OpenAIRE |
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