Novel rare earth-bearing ultra-high-temperature ceramics tested in a solar furnace above 2,200 °C in air
ANDRÉANI, Anne-Sophie
Laboratoire des Composites Thermostructuraux [LCTS]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire des Composites Thermostructuraux [LCTS]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
ANDRÉANI, Anne-Sophie
Laboratoire des Composites Thermostructuraux [LCTS]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
< Réduire
Laboratoire des Composites Thermostructuraux [LCTS]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Langue
en
Article de revue
Ce document a été publié dans
Oxidation of Metals. 2013, vol. 80, n° 3-4, p. 257-266
Springer Verlag
Résumé en anglais
A novel method for testing ultra-high-temperature ceramics (UHTC) at very high temperature (above to 2,200 °C) in air with an exposure time of several minutes is used. The well-known ZrB2 + SiC material shows a limited ...Lire la suite >
A novel method for testing ultra-high-temperature ceramics (UHTC) at very high temperature (above to 2,200 °C) in air with an exposure time of several minutes is used. The well-known ZrB2 + SiC material shows a limited temperature of use in an oxidizing environment due to the low stability above 2,000 °C of any silica that is formed. A few new systems without silicon are proposed, starting with the Hf or Zr, C, B and rare earth elements. The choice of rare earths is motivated by the formation of oxides with melting points higher than 2,000 °C. The complex oxide scales formed during oxidation are accurately described, in terms of presence of porosity and gradients of composition. Similarities with the mechanism of oxidation described for ZrB2 + SiC materials are shown. A significantly higher thermal stability of rare-earth oxide containing ceramics compared to silica is highlighted. As a consequence, the protective capacity of the oxide scale is improved.< Réduire
Mots clés en anglais
Solar furnace
Dysprosium
Oxidation mechanism
Origine
Importé de halUnités de recherche