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Low-temperature emissivity of thin Al2O3 layers deposited on copper substrate
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SYSNO ASEP 0552663 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Low-temperature emissivity of thin Al2O3 layers deposited on copper substrate Author(s) Frolec, Jiří (UPT-D) RID, ORCID, SAI
Králík, Tomáš (UPT-D) RID, ORCID, SAI
Nyman, L. (FI)
Pudas, M. (FI)
Kallio, E. (FI)Source Title Cryogenics 2021 online. The 16th Cryogenics 2021 IIR International Conference, October 5-7, 2021. Proceedings. - Praha : ICCEX, 2021 - ISSN 0151-1637 - ISBN 978-2-36215-047-0 Pages s. 113-118 Number of pages 6 s. Publication form Online - E Action Cryogenics 2021. IIR International Conference /16./ Event date 05.10.2021 - 07.10.2021 VEvent location online Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords heat transfer ; thermal radiation ; cryogenics ; surface finish Subject RIV BJ - Thermodynamics OECD category Thermodynamics R&D Projects LO1212 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) ED0017/01/01 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UPT-D - RVO:68081731 DOI 10.18462/iir.cryo.2021.0042 Annotation Copper is commonly used in cryogenic systems due to its high thermal and electrical conductivity along with excellent solderability. Very low emissivity values of copper surface also reduce in cryogenic systems heat load transferred by thermal radiation. These values may be, however, enhanced by a prospective coating, deposited usually in order to prevent chemical changes on highly reactive copper surface. This paper focuses on protective layers of Al2O3 with thicknesses up to 28 nm, deposited on polished copper. We measured total hemispherical emissivity at cryogenic temperatures before and after the coating process. Contribution of Al2O3 layer to original copper emissivity increased with rising temperature of the layer and with the layer thickness. However, emissivity of the coated copper stayed below 2%, allowing usage of the coated copper in systems where low heat load by thermal radiation is needed. Preliminary tests with oxygen plasma shows that deposited layers can effectively protect the copper surface against oxidation and maintain the original thermal-radiative properties. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2022 Electronic address https://iifiir.org/fr/fridoc/emissivite-a-basse-temperature-de-couches-minces-144402
Number of the records: 1