Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 12, Pages 13704-13714Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.05.169
Keywords
Anti-CMAS coating; Yttria; Inorganic or colloidal sol-gel; Alkoxide route; Morphology control
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Funding
- French Defence Research Organization (DGA) (DGA) [2014.60.0057]
- SAFRAN Tech
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Anti-CMAS yttria coatings have been prepared by sol-gel routes. Yttria powders with controlled morphology are prepared via auto-combustion of yttrium precursors in a polymerized matrix. The influence of key parameters of the water-based sols is assessed. Indeed, the pH of the initial sol and the temperature of thermal treatment play a major role in the morphology and grain size of yttria powders. To prevent infiltration of CMAS, yttria powders are proposed to be synthesized at pH=1 of the aqueous sol, with drying of the sol and heating at 900 degrees C. After optimization of the synthesis and deposition conditions via sol-gel route, yttria-based coatings with high specific surface area are obtained. They promote the interaction with melt CMAS and consequently limit the degradation of the thermal barrier coatings situated underneath. It was proved that anti-CMAS yttria coating is effective against the infiltration of CMAS at 1250 degrees C for 15 min and even 1 h. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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