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Title: Hydrothermal Corrosion of Coatings on Silicon Carbide in Boiling Water Reactor Conditions

Abstract

SiC/SiC ceramic matrix composites are an attractive material for use as accident tolerant fuel cladding. However, despite its resistance to corrosion in high-temperature steam, SiC is known to dissolve in high-temperature water, necessitating the use of corrosion-resistant coatings. Here, samples were exposed in 288°C water with 2 ppmw dissolved oxygen to simulate boiling water reactor (BWR) normal water chemistry (NWC) and 288°C water with 150 ppbw dissolved hydrogen to simulate BWR hydrogen water chemistry. Several candidate coatings were tested: Cr, CrN, TiN, and ZrN. All coatings were applied by physical vapor deposition onto chemical vapor deposition SiC (CVD-SiC) substrates. Two uncoated SiC/SiC variants were also exposed and degraded more rapidly compared to CVD-SiC, especially in NWC. Cr and CrN coated specimens were found to have low mass change, suggesting they are promising candidate coatings. Lastly, TiN coatings were found to oxidize rapidly, suggesting that coatings would fully oxidize during service in BWR environments. ZrN coatings dissolved completely during exposure.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1558568
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Corrosion
Additional Journal Information:
Journal Volume: 75; Journal Issue: 2; Journal ID: ISSN 0010-9312
Publisher:
NACE International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; accident-tolerant fuel; coatings; hydrothermal; nuclear; silicon carbide; SiC

Citation Formats

Raiman, Stephen S., Doyle, Peter J., Ang, Caen K., Kato, Yutai, and Terrani, Kurt. Hydrothermal Corrosion of Coatings on Silicon Carbide in Boiling Water Reactor Conditions. United States: N. p., 2018. Web. doi:10.5006/2997.
Raiman, Stephen S., Doyle, Peter J., Ang, Caen K., Kato, Yutai, & Terrani, Kurt. Hydrothermal Corrosion of Coatings on Silicon Carbide in Boiling Water Reactor Conditions. United States. doi:10.5006/2997.
Raiman, Stephen S., Doyle, Peter J., Ang, Caen K., Kato, Yutai, and Terrani, Kurt. Tue . "Hydrothermal Corrosion of Coatings on Silicon Carbide in Boiling Water Reactor Conditions". United States. doi:10.5006/2997. https://www.osti.gov/servlets/purl/1558568.
@article{osti_1558568,
title = {Hydrothermal Corrosion of Coatings on Silicon Carbide in Boiling Water Reactor Conditions},
author = {Raiman, Stephen S. and Doyle, Peter J. and Ang, Caen K. and Kato, Yutai and Terrani, Kurt},
abstractNote = {SiC/SiC ceramic matrix composites are an attractive material for use as accident tolerant fuel cladding. However, despite its resistance to corrosion in high-temperature steam, SiC is known to dissolve in high-temperature water, necessitating the use of corrosion-resistant coatings. Here, samples were exposed in 288°C water with 2 ppmw dissolved oxygen to simulate boiling water reactor (BWR) normal water chemistry (NWC) and 288°C water with 150 ppbw dissolved hydrogen to simulate BWR hydrogen water chemistry. Several candidate coatings were tested: Cr, CrN, TiN, and ZrN. All coatings were applied by physical vapor deposition onto chemical vapor deposition SiC (CVD-SiC) substrates. Two uncoated SiC/SiC variants were also exposed and degraded more rapidly compared to CVD-SiC, especially in NWC. Cr and CrN coated specimens were found to have low mass change, suggesting they are promising candidate coatings. Lastly, TiN coatings were found to oxidize rapidly, suggesting that coatings would fully oxidize during service in BWR environments. ZrN coatings dissolved completely during exposure.},
doi = {10.5006/2997},
journal = {Corrosion},
issn = {0010-9312},
number = 2,
volume = 75,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
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