Corrosion resistant coatings for zirconium-alloy cladding with improved accident tolerance

Peng Xu, Edward J. Lahoda, Sumit Ray, Jonna M. Partezana, Kumar Sridharan, Douglas E. Wolfe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

The Westinghouse-led accident tolerant fuel (ATF) program is evaluating Accident Tolerant Fuel (ATF) coatings of MAX phase (Ti2AlC) and multi-layer TixAl1-xN/TiN to enhance the oxidation resistance of zirconiumalloy fuel cladding in both normal operation and beyond design-based conditions. A variety of coating technologies have been applied to deposit these coating materials onto Zircaloy-4 or ZIRLO®1 sheets and tubes, including cold spray and cathodic arc-physical vapor deposition (CA-PVD). Neutronic analysis using the elemental compositions of the coating materials showed that the coating thicknesses should be less than 30μm for most coating materials to avoid non-negligible economic penalty. The coated samples were autoclave tested in water at 360°C and 150 bar or in steam at 427°C and 103 bar for corrosion resistance evaluation. The initial Ti2AlC coating made by using large particle size MAX phase powder and cold spray deposition did not provide the desired corrosion resistance due to un-optimized microstructure and porosity. Subsequent optimization including reduction in particle size and tuning of cold spray deposition parameters resulted denser coatings less than 30 microns in thickness. Optimization of process conditions resulted in reduced oxidation kinetics and showed that the coating acts as an effective barrier to prevent the zirconium substrate from oxidizing in accident condition temperatures. High purity Ti2AlC powder is needed to further improve oxidation resistance of the Ti2AlC coating. The oxidation resistance of pure monolithic MAX phase compound was also found to be remarkable, and the weight gain was only 1.85 mg/cm2 for 96 hours exposure in 1200°C steam, which is consistent with the literature. The corrosion resistance of the TiAlN/TiN multilayer coating was excellent. The weight gain was negligible and no oxidation was observed on the surface of zirconium-alloy at the coating-substrate interface.

Original languageEnglish (US)
Title of host publicationTop Fuel 2016
Subtitle of host publicationLWR Fuels with Enhanced Safety and Performance
PublisherAmerican Nuclear Society
Pages1189-1196
Number of pages8
ISBN (Electronic)9780894487309
StatePublished - Jan 1 2016
EventTop Fuel 2016: LWR Fuels with Enhanced Safety and Performance - Boise, United States
Duration: Sep 11 2016Sep 15 2016

Publication series

NameTop Fuel 2016: LWR Fuels with Enhanced Safety and Performance

Other

OtherTop Fuel 2016: LWR Fuels with Enhanced Safety and Performance
CountryUnited States
CityBoise
Period9/11/169/15/16

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Nuclear Energy and Engineering

Cite this

Xu, P., Lahoda, E. J., Ray, S., Partezana, J. M., Sridharan, K., & Wolfe, D. E. (2016). Corrosion resistant coatings for zirconium-alloy cladding with improved accident tolerance. In Top Fuel 2016: LWR Fuels with Enhanced Safety and Performance (pp. 1189-1196). (Top Fuel 2016: LWR Fuels with Enhanced Safety and Performance). American Nuclear Society.