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

Abstract

The Westinghouse-led accident tolerant fuel (ATF) program is evaluating Accident Tolerant Fuel (ATF) coatings of MAX phase (Ti{sub 2}AlC) and multi-layer Ti{sub x}Al{sub 1-x}N/TiN to enhance the oxidation resistance of zirconium alloy fuel cladding in both normal operation and beyond design-based conditions of light water reactors. A variety of coating technologies have been applied to deposit these coating materials onto Zircaloy-4 or Zirlo 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 30 μm for most coating materials to avoid non-negligible economic penalty. The coated samples were autoclave tested in water at 360 Celsius degrees and 150 bar or in steam at 427 Celsius and 103 bar for corrosion resistance evaluation. The initial Ti{sub 2}AlC 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 in denser coatings less than 30 microns in thickness. Optimization of process conditions resulted in reduced oxidation kinetics and showed thatmore » the coating acts as an effective barrier to prevent the zirconium substrate from oxidizing in accident condition temperatures. High purity Ti{sub 2}AlC powder is needed to further improve oxidation resistance of the Ti{sub 2}AlC 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/cm{sup 2} for 96 hours exposure in 1200 C. degrees 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. (authors)« less

Authors:
;  [1];  [2];  [3];  [4];  [5]
  1. Westinghouse Electric Company LLC, Hopkins, SC 29061 (United States)
  2. Westinghouse Electric Company LLC, Cranberry Township, PA 16066 (United States)
  3. Westinghouse Electric Company LLC, Pittsburgh, PA 15235 (United States)
  4. University of Wisconsin, Madison WI 53705 (United States)
  5. Penn State University, University Park, PA 16802 (United States)
Publication Date:
Research Org.:
American Nuclear Society - ANS, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
OSTI Identifier:
22765198
Resource Type:
Conference
Resource Relation:
Conference: TOP FUEL 2016: LWR fuels fuels with enhanced safety and performance, Boise, ID (United States), 11-15 Sep 2016; Other Information: Country of input: France; 19 refs.; Related Information: In: TOP FUEL 2016 Proceedings| 1670 p.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; ACCIDENT-TOLERANT NUCLEAR FUELS; CLADDING; CORROSION RESISTANCE; LAYERS; NUCLEAR INDUSTRY; OPTIMIZATION; OXIDATION; PARTICLE SIZE; PHYSICAL VAPOR DEPOSITION; POWDERS; SPRAYS; STEAM; TEMPERATURE RANGE 0400-1000 K; THICKNESS; TITANIUM NITRIDES; WATER COOLED REACTORS; WATER MODERATED REACTORS; ZIRCALOY 4; ZIRCONIUM

Citation Formats

Xu, P., Ray, S., Lahoda, E. J., Partezana, J. M., Sridharan, K., and Wolfe, D. E. Corrosion resistant coatings for zirconium-alloy cladding with improved accident tolerance. United States: N. p., 2016. Web.
Xu, P., Ray, S., Lahoda, E. J., Partezana, J. M., Sridharan, K., & Wolfe, D. E. Corrosion resistant coatings for zirconium-alloy cladding with improved accident tolerance. United States.
Xu, P., Ray, S., Lahoda, E. J., Partezana, J. M., Sridharan, K., and Wolfe, D. E. Fri . "Corrosion resistant coatings for zirconium-alloy cladding with improved accident tolerance". United States.
@article{osti_22765198,
title = {Corrosion resistant coatings for zirconium-alloy cladding with improved accident tolerance},
author = {Xu, P. and Ray, S. and Lahoda, E. J. and Partezana, J. M. and Sridharan, K. and Wolfe, D. E.},
abstractNote = {The Westinghouse-led accident tolerant fuel (ATF) program is evaluating Accident Tolerant Fuel (ATF) coatings of MAX phase (Ti{sub 2}AlC) and multi-layer Ti{sub x}Al{sub 1-x}N/TiN to enhance the oxidation resistance of zirconium alloy fuel cladding in both normal operation and beyond design-based conditions of light water reactors. A variety of coating technologies have been applied to deposit these coating materials onto Zircaloy-4 or Zirlo 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 30 μm for most coating materials to avoid non-negligible economic penalty. The coated samples were autoclave tested in water at 360 Celsius degrees and 150 bar or in steam at 427 Celsius and 103 bar for corrosion resistance evaluation. The initial Ti{sub 2}AlC 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 in 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 Ti{sub 2}AlC powder is needed to further improve oxidation resistance of the Ti{sub 2}AlC 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/cm{sup 2} for 96 hours exposure in 1200 C. degrees 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. (authors)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {7}
}

Conference:
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