Regensburg 2010 – scientific programme
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KR: Fachverband Kristallographie
KR 2: Crystallography in nanoscience
KR 2.7: Talk
Tuesday, March 23, 2010, 11:45–12:00, H9
Nanolaminate's thermal conductivity at low temperatures — •Erik Mehner1, Stefan Braun2, Mathias Dörr3, and Dirk C. Meyer1 — 1Institut für Strukturphysik, Technische Universität Dresden,D-01062 Dresden,Germany — 2Fraunhofer IWS, Abteilung Röntgen-EUV-Optik Dresden — 3Insitut für Festkörperphysik, Technische Universität Dresden,D-01062 Dresden,Germany
Due to their importance for application in solar cells and gas turbines thermal barrier coatings were investigated.
Current understanding of the heat conductivity between nanoscale interfaces is still incomplete and subject of ongoing scientific work. The 3-omega-method is a well established method for thin-film thermal conductivity measurements. [1]
First results of the implementation of a low temperature 3-omega-measurement which was devised to seperate phononic and electronic heat conduction with respect to the conception of an thermal barrier coating are presented. Likewise the morphological and structural aspects of the multilayer coatings, were included in design considerations. After the setup's qualification with glass-substrates W/Al2O3-multilayer samples were examined. Their thermal conductivity of 0,6 Watts per meter Kelvin at room temperature is confirmed. [2] Alternatively the system ZrO2/Al2O3 was investigated showing good suitability for thermal barrier coating up to at least temperature of 800°C.
[1] R. M. Costescu, David G. Cahill, F. H. Fabreguette, Z. A. Sechrist, and S. M. George. Science, 303(5660), 989-990, (2004)
[2] David G. Cahill. Rev. Sci. Instrum., 61(2), 802-808, (1989)