Paper Title:
Environmental Barrier Coatings for Silicon Nitride
  Abstract

Ytterbium silicate layers were deposited on Si3N4 ceramics as environmental barrier coatings (EBCs) by a dip coating-sintering method. Coated samples were tested in an atmosphere simulating the practical conditions of a gas turbine to investigate water vapor corrosion and recession mechanisms of ytterbium silicate coatings. Prior and after tests, phase compositions and morphologies of the coatings varied as the consequence of the formation of silica at the coating/substrate interface. Due to the evaporation and diffusion of silica into the upper layer, a porous interface was finally found, which led to the spallation of coating.

  Info
Periodical
Edited by
Takashi Goto, Yi-Bing Cheng and Takashi Akatsu
Pages
139-144
DOI
10.4028/www.scientific.net/KEM.484.139
Citation
H. F. Chen, H. Klemm, "Environmental Barrier Coatings for Silicon Nitride", Key Engineering Materials, Vol. 484, pp. 139-144, 2011
Online since
July 2011
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$32.00
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