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Original title:
Low-temperature emissivity of thin Al2O3 layers deposited on copper substrate
Authors: Frolec, Jiří ; Králík, Tomáš ; Nyman, L. ; Pudas, M. ; Kallio, E.
Document type: Papers
Conference/Event: Cryogenics 2021. IIR International Conference /16./, online (CZ), 20211005
Year: 2021
Language: eng
Abstract: 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.
Keywords: cryogenics; heat transfer; surface finish; thermal radiation
Project no.: LO1212 (CEP), ED0017/01/01
Funding provider: GA MŠk, GA MŠk
Host item entry: Cryogenics 2021 online. The 16th Cryogenics 2021 IIR International Conference, October 5-7, 2021. Proceedings, ISBN 978-2-36215-047-0, ISSN 0151-1637
Note: Související webová stránka: https://iifiir.org/fr/fridoc/emissivite-a-basse-temperature-de-couches-minces-144402
Institution: Institute of Scientific Instruments AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0328045
Permalink: http://www.nusl.cz/ntk/nusl-508451
The record appears in these collections:
Research > Institutes ASCR > Institute of Scientific Instruments
Conference materials > Papers
Authors: Frolec, Jiří ; Králík, Tomáš ; Nyman, L. ; Pudas, M. ; Kallio, E.
Document type: Papers
Conference/Event: Cryogenics 2021. IIR International Conference /16./, online (CZ), 20211005
Year: 2021
Language: eng
Abstract: 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.
Keywords: cryogenics; heat transfer; surface finish; thermal radiation
Project no.: LO1212 (CEP), ED0017/01/01
Funding provider: GA MŠk, GA MŠk
Host item entry: Cryogenics 2021 online. The 16th Cryogenics 2021 IIR International Conference, October 5-7, 2021. Proceedings, ISBN 978-2-36215-047-0, ISSN 0151-1637
Note: Související webová stránka: https://iifiir.org/fr/fridoc/emissivite-a-basse-temperature-de-couches-minces-144402
Institution: Institute of Scientific Instruments AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0328045
Permalink: http://www.nusl.cz/ntk/nusl-508451
The record appears in these collections:
Research > Institutes ASCR > Institute of Scientific Instruments
Conference materials > Papers
Record created 2022-09-28, last modified 2022-09-28