Journal
SURFACE & COATINGS TECHNOLOGY
Volume 200, Issue 5-6, Pages 1264-1269Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2005.07.085
Keywords
thermal barrier coatings; luminescence; zirconates; temperature sensing
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Pyrochlore zirconates are alternative materials to the presently used yttria-stabilized zirconia (7YSZ) for thermal barrier coatings. In this work, the use of europium as a solid-solution chromophore dopant is explored for measuring temperature in pyrochlore zirconates. Europium doping is found to give rise to strong luminescence as well as characteristic temperature-dependent luminescence lifetimes at high temperatures. Measurements of the luminescence lifetime of Eu-doped Gd2Zr2O7 and EU2Zr2O7 pyrochlores, as well as Eu-doped YSZ, indicate sensitivity to temperature up to at least 1200 degrees C. The maximum temperature for Eu-doped Sm2Zr2O7 is lower, about 1000 degrees C, for the dopant concentration used. These measurements provide the basis for non-contact sensing of temperature in europium-doped pyrochlores used in coatings. (c) 2005 Elsevier B.V. All rights reserved.
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