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research article

New approach to low thermal conductivity of thermal barrier protection with improved mechanical integrity

Michalek, Martin
•
Tewari, Abhishek  
•
Blugan, Gurdial
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2016
Ceramics International

Layered ceramic systems with designed stacks of dense and porous layers were investigated as alternative for thermal barrier protection system (TBPs). This approach gives the possibility to obtain low thermal conductivity with the impact protection of dense external layers whilst maintaining the relatively high mechanical properties. Different stacking configurations have been proposed utilizing in total a combination of up to 30 dense/porous layers. Porous layers were produced with two different nominal porosities 20 vol% and 40 vol%. For comparison uni-axial pressed samples with the same porosity level have been prepared. Thermal and mechanical characterization was performed on samples of tape cast (with different stacking designs) and uni-axial pressed fully stabilized zirconia TBPs. The layered fully stabilized zirconia (8YSZ) has 15-30 % lower thermal conductivity in comparison with the uni-axial pressed samples, nevertheless by the same Young's modulus value. The results of the thermal and mechanical observation shows, that such an approach can be beneficial as an alternative for future thermal barrier protection systems. (c) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

  • Details
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Type
research article
DOI
10.1016/j.ceramint.2016.01.059
Web of Science ID

WOS:000372676000035

Author(s)
Michalek, Martin
Tewari, Abhishek  
Blugan, Gurdial
Bowen, Paul  
Hofmann, Heinrich  
Graule, Thomas
Kuebler, Jakob
Date Issued

2016

Publisher

Elsevier

Published in
Ceramics International
Volume

42

Issue

6

Start page

6817

End page

6824

Subjects

Thermal bather protection

•

Zirconia

•

Tape casting

•

Thermal conductivity

•

Young's modulus

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LTP  
Available on Infoscience
July 19, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/127818
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