Performance of a diffusion barrier under a fuel-clad chemical interaction (FCCI)

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Studies were carried out to assess the performance of a vapor deposition as a diffusion barrier under a fuel-clad chemical interaction (FCCI). Single or multiple layers of zirconium, chromium and titanium were coated onto a HT9 clad surface and diffusion couple tests at 800 degrees C for 25 h were carried out for a U-10 wt%Zr metallic fuel. While a massive reaction occurred at the fuel-clad interface for the specimen without any surface treatment, the vapor-deposited specimens showed an excellent resistance against a FCCI regardless of the coating materials. Specimen coated with zirconium remained intact. However, the coating consists of the multiple layers with titanium, chromium and zirconium dissolved and formed as a precipitate at a fuel interface after the diffusion couple test. Although it dissolved and precipitated as small-sized particles during the diffusion test, secondary zirconium-rich phase preferentially agglomerated around the particles, which acted as a barrier against FCCI. (C) 2009 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2009-11
Language
English
Article Type
Article
Citation

JOURNAL OF NUCLEAR MATERIALS, v.394, no.2-3, pp.144 - 150

ISSN
0022-3115
DOI
10.1016/j.jnucmat.2009.08.018
URI
http://hdl.handle.net/10203/255627
Appears in Collection
NE-Journal Papers(저널논문)
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