Synthesis and thermal stability of Re2Zr2O7, (Re=La, Gd) and La2(Zr1-xCex)2O7-δ compounds under reducing and oxidant atmospheres for thermal barrier coatings

Aurélien Joulia 1 Michel Vardelle 1 Sylvie Rossignol 2, *
* Auteur correspondant
1 Axe 2 : procédés de traitements de surface
SPCTS - Science des Procédés Céramiques et de Traitements de Surface
2 SPCTS-AXE3 - Axe 3 : organisation structurale multiéchelle des matériaux
SPCTS - Science des Procédés Céramiques et de Traitements de Surface
Abstract : Rare-earth zirconates and cerates have attracted particular interest for thermal barrier coating (TBC) applications due to their advantageous thermal properties, such as a low conductivity and efficient phase stability at elevated temperatures. This study focuses on synthesising La2Zr2O7, Gd2Zr2O7, La2Ce2O7-γ and La2(Zr0.7Ce0.3)O7-γ compounds via two soft chemistry processes, alkoxide and citrate synthesis. Thermal analysis, X-ray diffraction (XRD) and scanning electron microscope observations were used to analyse the powder after calcinations under air. Chemical reactivity tests under a reducing atmosphere were performed at 1400°C and investigated by XRD analysis. It was found that the lanthanum and gadolinium zirconates are the most stable and interesting materials under an Ar(g)/3%H2(g) atmosphere. © 2013 Elsevier Ltd
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Contributeur : Sylvie Rossignol <>
Soumis le : mercredi 23 juillet 2014 - 17:49:08
Dernière modification le : mercredi 14 février 2018 - 16:29:44

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  • HAL Id : hal-01044606, version 1

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Aurélien Joulia, Michel Vardelle, Sylvie Rossignol. Synthesis and thermal stability of Re2Zr2O7, (Re=La, Gd) and La2(Zr1-xCex)2O7-δ compounds under reducing and oxidant atmospheres for thermal barrier coatings. Journal of the European Ceramic Society, Elsevier, 2013, 33 (13), pp.2633-2644. ⟨hal-01044606⟩

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