Low-temperature emissivity of thin Al2O3 layers deposited on copper substrate

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F21%3A00552663" target="_blank" >RIV/68081731:_____/21:00552663 - isvavai.cz</a>
Result on the web
<a href="https://iifiir.org/fr/fridoc/emissivite-a-basse-temperature-de-couches-minces-144402" target="_blank" >https://iifiir.org/fr/fridoc/emissivite-a-basse-temperature-de-couches-minces-144402</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.18462/iir.cryo.2021.0042" target="_blank" >10.18462/iir.cryo.2021.0042</a>

Result language
angličtina
Original language name
Low-temperature emissivity of thin Al2O3 layers deposited on copper substrate
Original language description
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.
Czech name
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Czech description
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Cryogenics 2021 online. The 16th Cryogenics 2021 IIR International Conference, October 5-7, 2021. Proceedings
ISBN
978-2-36215-047-0
ISSN
0151-1637
e-ISSN
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Number of pages
6
Pages from-to
113-118
Publisher name
ICCEX
Place of publication
Praha
Event location
online
Event date
Oct 5, 2021
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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