Mass Transfer in Yb Silicate Environmental Barrier Coatings at High Temperatures

Satoshi Kitaoka; Tsuneaki Matsudaira; Masashi Wada; Naoki Kawashima; Daisaku Yokoe; Masasuke Takata

doi:10.4028/www.scientific.net/MSF.941.1898

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HomeMaterials Science ForumMaterials Science Forum Vol. 941Mass Transfer in Yb Silicate Environmental Barrier...

Mass Transfer in Yb Silicate Environmental Barrier Coatings at High Temperatures

Abstract:

The oxygen permeabilities of polycrystalline Yb₂Si₂O₇ wafers cut from sintered bodies to serve as models of environmental barrier coatings were determined at temperatures up to 1673 K under various oxygen potential gradients (dµ_O), produced by exposing the upper and lower surfaces of the wafer to atmospheres with different oxygen partial pressures (P_O2). Oxygen permeation proceeded via grain boundary (GB) diffusion of oxygen from the higher P_O2 surface to the lower P_O2 surface, concurrently with GB diffusion of ytterbium in the opposite direction. Mass transfer analysis allowed for a design guideline for selectively enhancing the structural stability of the ytterbium silicate layer with applying a dµ_O.

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Materials Science Forum (Volume 941)

Pages:

1898-1903

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.941.1898

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Online since:

December 2018

Authors:

Satoshi Kitaoka, Tsuneaki Matsudaira, Masashi Wada, Naoki Kawashima, Daisaku Yokoe, Masasuke Takata

Keywords:

Diffusion, High Temperature, Oxygen Permeation, Yb Silicate

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