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 deg 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.
Thermo-mechanical behaviour of HfO2 coatings for aerospace applications
Thermomechanisches Verhalten von HfO2-Beschichtungen für Raumfahrtanwendungen
2008
5 Seiten, 7 Bilder, 9 Quellen
Conference paper
English
Keramikmatrix-Verbundwerkstoff , SiC (Siliciumcarbid) , Beschichtung (Überzug) , Hafniumoxid , Raumfahrttechnik , Oxidationsschutz , Schutzschicht , Magnetronsputtern , Oxidationsbeständigkeit , Wiedereintritt , Grenzfläche , Hafniumsilicat , Schichtdicke , Röntgenbeugung , Rasterelektronenmikroskopie , EDS (energiedispersive Spektrometrie) , Temperaturprofil
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