TiAlN/Ag multilayer coatings with a different number of bilayers and thicknesses of individual layers were fabricated by DC magnetron co-sputtering. Thermal conductivity was measured in dependence of Ag layer thickness. It was found anomalous low thermal conductivity of silver comparing to TiAlN and Ag bulk standards and TiAlN/TiN multilayers. The physical nature of such thermal barrier properties of the multilayer coatings was explained on the basis of reflection electron energy loss spectroscopy. The analysis shows that nanostructuring of the coating decreases the density of states and velocity of acoustic phonons propagation. At the same time, multiphonon channels of heat propagation degenerate. These results demonstrate that metal-dielectric interfaces in TiAlN/Ag coatings are insurmountable obstacles for acoustic phonons propagation.
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30 May 2016
Research Article|
June 03 2016
The confinement of phonon propagation in TiAlN/Ag multilayer coatings with anomalously low heat conductivity
A. I. Kovalev;
A. I. Kovalev
1
Surface Phenomena Researches Group
, Radio Str., 23/9, Bld. 2, Off. 475, CNIICHERMET, 105005 Moscow, Russia
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D. L. Wainstein;
D. L. Wainstein
a)
1
Surface Phenomena Researches Group
, Radio Str., 23/9, Bld. 2, Off. 475, CNIICHERMET, 105005 Moscow, Russia
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A. Yu. Rashkovskiy
;
A. Yu. Rashkovskiy
1
Surface Phenomena Researches Group
, Radio Str., 23/9, Bld. 2, Off. 475, CNIICHERMET, 105005 Moscow, Russia
2
National University of Science and Technology MISiS
, Leninskiy pr-t, 4, 119049 Moscow, Russia
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R. Gago
;
R. Gago
3
Instituto de Ciencia de Materiales de Madrid
, Consejo Superior de Investigaciones Científicas, E-28049 Madrid, Spain
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F. Soldera;
F. Soldera
4Department of Materials Science and Engineering,
Saarland University
, 66123 Saarbruecken, Germany
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J. L. Endrino
J. L. Endrino
5School of Aerospace, Transport and Manufacturing (SATM), Surface Engineering and Nanotechnology Institute
, Cranfield University
, College Road, Cranfield, MK43 0AL Bedfordshire, United Kingdom
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a)
Author to whom correspondence should be addressed. Electronic mail: d_wainstein@sprg.ru
Appl. Phys. Lett. 108, 223106 (2016)
Article history
Received:
April 13 2016
Accepted:
May 23 2016
Citation
A. I. Kovalev, D. L. Wainstein, A. Yu. Rashkovskiy, R. Gago, F. Soldera, J. L. Endrino; The confinement of phonon propagation in TiAlN/Ag multilayer coatings with anomalously low heat conductivity. Appl. Phys. Lett. 30 May 2016; 108 (22): 223106. https://doi.org/10.1063/1.4953230
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