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Protective yttria coatings of melting crucible for metallic fuel slugs
Author(s) -
Kim JongHwan,
Song Hoon,
Kim KiHwan,
Lee ChanBock
Publication year - 2015
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5703
Subject(s) - materials science , coating , graphite , yttria stabilized zirconia , crucible (geodemography) , yttrium , metallurgy , layer (electronics) , niobium , thermal spraying , slurry , temperature cycling , substrate (aquarium) , composite material , ceramic , oxide , thermal , cubic zirconia , chemistry , computational chemistry , physics , oceanography , meteorology , geology
As one of the candidate coating materials for a melting crucible, yttrium oxides were deposited on graphite and niobium substrates using slurry and plasma spraying methods. Thermal cycling tests and interaction studies between U–Zr/U–Zr–RE fuel melt and the Y 2 O 3 coatings were carried out to evaluate the performance as reusable coatings for a melting crucible. A multi‐layer coating method was also applied to overcome the issue of a thermal expansion mismatch between the coating and substrate. The results showed that the plasma‐sprayed coatings showed a good consolidation after deposition compared to slurry coating. The plasma‐sprayed Y 2 O 3 coating on the niobium substrate showed better thermal cycling resistance than those coated on a graphite substrate. The proposed TaC/Y 2 O 3 double‐layer coating which was plasma‐sprayed on the niobium substrate showed improved characteristics with no reaction layer formation and no separation from the substrate after the interaction with the U–Zr–RE melt. Copyright © 2014 John Wiley & Sons, Ltd.