ISSN:
0142-2421
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
X-ray photoelectron spectroscopy (XPS), angular-dependent XPS and x-ray-inducd Auger electron spectroscopy (XAES) have been used to investigate impurity (Si, Na and Al) segregation in 25.5 wt.% CeO2-2.5 Y2O3-72 ZrO2 plasma-sprayed thermal barrier coatings (TBCs) as a function of high-temperature air thermal treatment (up to 1460°C). The segregated phase, present in a similar composition both on the as-thermally treated and fracture surfaces, forms a thin layer of ∼20 nm thick. This phase contains both silicon and sodium at a temperature ranging between 900 and 1350°C and it is also enriched with aluminium at higher temperatures. The XPS and XAES results are used to identify the chemical composition of this surface phase.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/sia.740160193
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