Low temperature thermal radiative properties of gold coated metals

0479385 - ÚPT 2018 RIV GB eng J - Journal Article
Frolec, Jiří - Králík, Tomáš - Srnka, Aleš
Low temperature thermal radiative properties of gold coated metals.
International Journal of Refrigeration. Roč. 82, OCT (2017), s. 51-55. ISSN 0140-7007. E-ISSN 1879-2081
R&D Projects: GA MŠMT(CZ) LO1212
Institutional support: RVO:68081731
Keywords : gold films * heat transfer * thermal radiation * cryogenics
OECD category: Thermodynamics
Impact factor: 3.233, year: 2017

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.
Permanent Link: http://hdl.handle.net/11104/0275357