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 |
| |
| Authors: | A Joulia M Vardelle S Rossignol |
| |
| Affiliation: | 1. Groupe d’Etude des Matériaux Hétérogènes (GEMH-ENSCI), Ecole Nationale Supérieure de Céramique Industrielle, 12 rue Atlantis, 87068 Limoges Cedex, France;2. SPCTS, UMR CNRS No. 7315, Université de Limoges, 12 rue Atlantis, 87068 Limoges Cedex, France;3. CNES (French Space Agency), 52 rue Jacques Hillairet, 75612 Paris Cedex, France |
| |
| 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. |
| |
| Keywords: | Pyrochlores Thermal barrier coatings Rare-earth oxides Soft chemistry Hydrogen |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
