Thermo-Mechanical Behaviour of HfO2 Coatings for Aerospace Applications

Abstract:

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The use of ceramic composite materials in aerospace applications requires the development of oxidization protection coatings which can withstand very high temperatures. HfO2 is a promising material as a high temperature oxidization protective layer. HfO2 coatings have been deposited by radiation frequency magnetron sputtering all over the surface of SiC substrates and were tested under re-entry conditions. Also their oxidization resistance in air in the temperature range 1100 to 1450°C has been examined. The coatings were found to be stable and well-adhering to the substrate even after 100 re-entry cycles. No oxidization of the underlying SiC structure is observed. Re-entry and oxidization tests result in the formation of HfSiO4 at the HfO2/SiC interface, which further promotes their oxidization resistance.

Info:

Periodical:

Edited by:

Ch. Linsmeier and M. Reinelt

Pages:

87-91

DOI:

10.4028/www.scientific.net/AMR.59.87

Citation:

K. Mergia et al., "Thermo-Mechanical Behaviour of HfO2 Coatings for Aerospace Applications", Advanced Materials Research, Vol. 59, pp. 87-91, 2009

Online since:

December 2008

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