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Self-propagating high-temperature synthesis of functionally graded materials as thermal protection systems for high-temperature applications

Published online by Cambridge University Press:  31 January 2011

N. Bertolino ,
M. Monagheddu ,
A. Tacca ,
P. Giuliani ,
C. Zanotti ,
F. Maglia  and
U. Anselmi Tamburini
N. Bertolino
Affiliation:
Institute for Energetics and Interfases-National Research Council (IENI-CNR), Via Cozzi 53, 20125 Milano, Italy
M. Monagheddu
Affiliation:
Institute for Energetics and Interfases-National Research Council (IENI-CNR), Via Cozzi 53, 20125 Milano, Italy
A. Tacca
Affiliation:
Institute for Energetics and Interfases-National Research Council (IENI-CNR), Via Cozzi 53, 20125 Milano, Italy
P. Giuliani
Affiliation:
Institute for Energetics and Interfases-National Research Council (IENI-CNR), Via Cozzi 53, 20125 Milano, Italy
C. Zanotti
Affiliation:
Institute for Energetics and Interfases-National Research Council (IENI-CNR), Via Cozzi 53, 20125 Milano, Italy
F. Maglia
Affiliation:
Dipartimento di Chimica fisica, IENI-CNR, Università di Pavia, Viale Taramelli 16, 27100 Pavia, Italy
U. Anselmi Tamburini
Affiliation:
Dipartimento di Chimica fisica, IENI-CNR, Università di Pavia, Viale Taramelli 16, 27100 Pavia, Italy
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Abstract

Self-propagating high-temperature synthesis was used to prepare boride-based functionally graded materials (FGMs) as thermal barriers for space re-entry vehicles. FGMs are characterized by inhomogeneous spatial composition, resulting in different spatial characteristics. In this work, the FGMs were composed of a ceramic [i.e., MB2 (M = Ti, Zr, Hf)] and a metallic (i.e., NiAl) side, joined together by composite layers of graded stoichiometries of the two components. Thus, in the same material, the boride end gives thermal insulation, while the intermetallic end offers an easy junction to the structure of the space aircraft. The prepared FGMs showed good adhesion between the layers and global compactness after preparation and thermal tests. The microhardness along the samples was measured, and their insulating capabilities were evaluated.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 2 , February 2003 , pp. 448 - 455
Copyright
Copyright © Materials Research Society 2003

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