Low temperature thermal radiative properties of gold coated metals
Result description
In order to assess the effect of gold deposition on thermal radiative properties of metallic materials, we measured total hemispherical emissivity and absorptivity of Au layers with a minimal thickness of 1 mu m in dependence on the temperature T-R of thermal radiation (from 20 K up to 320 K). Technically pure copper or titanium alloy (Ti-6Al-4V) was used as substrate while three types of Au layers were deposited by a sputtering process or a galvanic method. Emissivities among samples with Au layers ranged from 1.8 percent to 3.9 percent at room temperature. Galvanic deposition of pure Au lowered the original emissivity of Ti-6Al-4V alloy at 300 K from 15.8 percent to 3.4 percent, whereas the same deposition on mechanically polished Cu resulted in increase of emissivity by a factor of three, up to 3.2 percent. Absorptivity of each sample with Cu or Au surface was lower than its emissivity and showed a weaker dependence on T-R.
Keywords
The result's identifiers
Result code in IS VaVaI
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
Low temperature thermal radiative properties of gold coated metals
Original language description
In order to assess the effect of gold deposition on thermal radiative properties of metallic materials, we measured total hemispherical emissivity and absorptivity of Au layers with a minimal thickness of 1 mu m in dependence on the temperature T-R of thermal radiation (from 20 K up to 320 K). Technically pure copper or titanium alloy (Ti-6Al-4V) was used as substrate while three types of Au layers were deposited by a sputtering process or a galvanic method. Emissivities among samples with Au layers ranged from 1.8 percent to 3.9 percent at room temperature. Galvanic deposition of pure Au lowered the original emissivity of Ti-6Al-4V alloy at 300 K from 15.8 percent to 3.4 percent, whereas the same deposition on mechanically polished Cu resulted in increase of emissivity by a factor of three, up to 3.2 percent. Absorptivity of each sample with Cu or Au surface was lower than its emissivity and showed a weaker dependence on T-R.
Czech name
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Czech description
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Classification
Type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20303 - Thermodynamics
Result continuities
Project
LO1212: ALISI - Centre of advanced diagnostic methods and technologies
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International Journal of Refrigeration
ISSN
0140-7007
e-ISSN
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Volume of the periodical
82
Issue of the periodical within the volume
OCT
Country of publishing house
GB - UNITED KINGDOM
Number of pages
5
Pages from-to
51-55
UT code for WoS article
000410699800006
EID of the result in the Scopus database
2-s2.0-85026840019
Basic information
Result type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
OECD FORD
Thermodynamics
Year of implementation
2017