English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Recession of environmental barrier coatings (EBC) in environments containingsteam is a pressing concern that requires further research before theirimplementation in gas turbine engines can be realized. In this work,free-standing plasma sprayed Yb2Si2O7 coatings were exposed to flowing steam at1350 {\deg}C and 1400 {\deg}C for 96 h. Three samples were investigated, onecoating with a low porosity level (< 3 %) and 1 wt.% Al2O3 representingtraditional EBCs; and two coatings with higher porosity levels (~20 %)representing abradable EBCs. Phase composition and microstructural evolutionwere studied in order to reveal the underlying mechanism for the interactionbetween high temperature steam and ytterbium disilicate. The results showdepletion of Yb2SiO5 near the surface and formation of ytterbium garnet(Yb3Al5O12) on top of all three coatings due to the reaction with gaseousAl-containing impurities coming from the alumina furnace tubes. The 1 wt.%Al2O3 added to the EBC sample exacerbated the formation of garnet at 1400{\deg}C compared to the abradable samples, which presented lower quantities ofgarnet. Additionally, inter-splat boundaries were visible after exposure,indicating preferential ingress of gaseous Al-containing impurities through thesplat boundaries

Steam Degradation of Ytterbium Disilicate Environmental Barrier Coatings: Effect of Composition, Microstructure and Temperature