CERAMIC COATINGS FOR METALLIC COMPONENTS IN SUPERCRITICAL WATER-COOLED REACTORS
The 5th International Symposium on SuperCritical Water-cooled Reactors - 2011 March 13-16


Presented at:
The 5th International Symposium on SuperCritical Water-cooled Reactors
2011 March 13-16
Location:
Vancouver,Canada
Session Title:
Materials IV (Coatings)

Authors:
Francesco P. Orfino (National Research Council)
Baisheng Yao (National Research Council)
Yongsong Xie (National Research Council)
Sing Yick (National Research Council)
Jamie Miles (University of New Brunswick)
William Cook (University of New Brunswick)
Rob Hui (National Research Council)
  

Abstract

Zr-2.5Nb, a Zirconium alloy, cannot be used itself as a material of construction for SCWR applications, although it is desirable, from a neutron economy standpoint to use zirconium alloys for in-core materials.  Thus, improving the oxidation resistance of zirconium through corrosion-resistant coatings is of interest for the SCWR. Plasma Electrolytic Oxidation (PEO) deposition was used to fabricate oxide coatings on Zr-2.5%Nb substrates from a sodium aluminate solution, which yielded an Al(0.18)Zr(0.82)O(1.91) coating.  Spray Pyrolysis Deposition (SPD) was also used to fabricate Cr2O3 films on Zircaloy substrates.  The samples were tested under supercritical water conditions (500oC, 25 MPa, deaerated) at exposure times of 100 and 250 hours.  A reduction in corrosion rates of up to 50% at 100 hours of exposure, and up to 28% at 250 hours of exposure was noted.  Both samples show improved corrosion resistance compared to the uncoated substrate.

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