Effect of gold coating on emissivity and absorptivity of Ti-6Al-4V alloy

0478277 - ÚPT 2018 RIV CZ eng C - Conference Paper (international conference)
Frolec, Jiří - Králík, Tomáš - Musilová, Věra - Urban, Pavel
Effect of gold coating on emissivity and absorptivity of Ti-6Al-4V alloy.
14th Cryogenics 2017. IIR International Conference. Proceedings. Praha: ICCEX, 2017, s. 492-497. ISBN 978-2-36215-022-7. ISSN 0151-1637.
[Cryogenics 2017 /14./. IIR International Conference. Dresden (DE), 15.05.2017-19.05.2017]
R&D Projects: GA MŠMT(CZ) LO1212; GA TA ČR TE01020233
Institutional support: RVO:68081731
Keywords : cryogenics * gold films * heat transfer * thermal radiation
OECD category: Thermodynamics

The article provides experimental analysis of total hemispherical emissivity and absorptivity of Ti-6Al-4V alloy before and after deposition of 1-2 .pí.m gold layer. We measured their dependences on the temperature of thermal radiation (varying from 20 K to 320 K) and confronted these results with mechanically polished copper, i.e. with material known for extremely low emissivity and absorptivity. Galvanic deposition of pure gold resulted in significant lowering of original emissivity of Ti-6Al-4V bare surfaces from 15.8 percent to 3.4 percent at 300 K and from 4.1 percent to 1.1 percent at 20 K. Our findings about thermal-radiative properties have practical relevance for an improvement of a low temperature part of an ultra-high vacuum scanning probe microscope
(UHV-SPM) designed by our group and could also be useful for other applications and low temperature systems.
Permanent Link: http://hdl.handle.net/11104/0274395