Journal
SURFACE & COATINGS TECHNOLOGY
Volume 201, Issue 7, Pages 3942-3946Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2006.08.011
Keywords
Raman scattering spectroscopy; photoluminescence spectroscopy; electron-beam PVD; europium YSZ; luminescence lifetime; thermal aging; crystal structure evolution
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The use of the luminescence from europium doped yttria-stabilized zirconia thermal barrier coatings for non-contact thermometry has been previously studied up to 850 degrees C [Choy, K.L. et al., Surface Engineering, 16 [6] (2000) 496] and 1150 degrees C [M.M. Gentleman and D.R. Clarke, Surface and Coatings Technology, 188-189 (2004) 93]. In this contribution we examine the effect of long-term, high temperature aging and martensitic phase transformation on both the details of the luminescence spectrum and the temperature-dependent lifetime of the luminescence. It is found that even after prolonged aging, the wavelength of the D-5(0)-> F-7(2) emission peak shifts only very slightly with increasing percentage of transformation to the monoclinic phase. Preliminary data suggests that the effect on the decay lifetime up to 1150 degrees C is very slight, expressed in a slight shift of the onset of thermal quenching to lower temperatures; the slope of the characteristic decay time-constant versus temperature appears relatively unaffected. (c) 2006 Elsevier B.V. All rights reserved.
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