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Title: Technique development for modulus, microcracking, hermeticity, and coating evaluation capability characterization of SiC/SiC tubes

Abstract

Driven by the need to enlarge the safety margins of nuclear fission reactors in accident scenarios, research and development of accident-tolerant fuel has become an important topic in the nuclear engineering and materials community. A continuous-fiber SiC/SiC composite is under consideration as a replacement for traditional zirconium alloy cladding owing to its high-temperature stability, chemical inertness, and exceptional irradiation resistance. An important task is the development of characterization techniques for SiC/SiC cladding, since traditional work using rectangular bars or disks cannot directly provide useful information on the properties of SiC/SiC composite tubes for fuel cladding applications. At Oak Ridge National Laboratory, experimental capabilities are under development to characterize the modulus, microcracking, and hermeticity of as-fabricated, as-irradiated SiC/SiC composite tubes. Resonant ultrasound spectroscopy has been validated as a promising technique to evaluate the elastic properties of SiC/SiC composite tubes and microcracking within the material. A similar technique, impulse excitation, is efficient in determining the basic mechanical properties of SiC bars prepared by chemical vapor deposition; it also has potential for application in studying the mechanical properties of SiC/SiC composite tubes. Complete evaluation of the quality of the developed coatings, a major mitigation strategy against gas permeation and hydrothermal corrosion, requires themore » deployment of various experimental techniques, such as scratch indentation, tensile pulling-off tests, and scanning electron microscopy. In addition, a comprehensive permeation test station is being established to assess the hermeticity of SiC/SiC composite tubes and to determine the H/D/He permeability of SiC/SiC composites. This report summarizes the current status of the development of these experimental capabilities.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE); USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1327675
Report Number(s):
ORNL/TM-2016/372
TRN: US1700312
DOE Contract Number:
AC05-00OR22725
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; SILICON CARBIDES; ACCIDENT-TOLERANT NUCLEAR FUELS; ELASTICITY; FUEL CANS; TUBES; SCANNING ELECTRON MICROSCOPY; EVALUATION; IRRADIATION; PERMEABILITY; COATINGS; FIBERS; PULSES; SPECTROSCOPY; ULTRASONIC WAVES; MECHANICAL PROPERTIES; COMPOSITE MATERIALS; HYDROGEN; DEUTERIUM; HELIUM

Citation Formats

Hu, Xunxiang, Ang, Caen K., Singh, Gyanender P., and Katoh, Yutai. Technique development for modulus, microcracking, hermeticity, and coating evaluation capability characterization of SiC/SiC tubes. United States: N. p., 2016. Web. doi:10.2172/1327675.
Hu, Xunxiang, Ang, Caen K., Singh, Gyanender P., & Katoh, Yutai. Technique development for modulus, microcracking, hermeticity, and coating evaluation capability characterization of SiC/SiC tubes. United States. doi:10.2172/1327675.
Hu, Xunxiang, Ang, Caen K., Singh, Gyanender P., and Katoh, Yutai. Mon . "Technique development for modulus, microcracking, hermeticity, and coating evaluation capability characterization of SiC/SiC tubes". United States. doi:10.2172/1327675. https://www.osti.gov/servlets/purl/1327675.
@article{osti_1327675,
title = {Technique development for modulus, microcracking, hermeticity, and coating evaluation capability characterization of SiC/SiC tubes},
author = {Hu, Xunxiang and Ang, Caen K. and Singh, Gyanender P. and Katoh, Yutai},
abstractNote = {Driven by the need to enlarge the safety margins of nuclear fission reactors in accident scenarios, research and development of accident-tolerant fuel has become an important topic in the nuclear engineering and materials community. A continuous-fiber SiC/SiC composite is under consideration as a replacement for traditional zirconium alloy cladding owing to its high-temperature stability, chemical inertness, and exceptional irradiation resistance. An important task is the development of characterization techniques for SiC/SiC cladding, since traditional work using rectangular bars or disks cannot directly provide useful information on the properties of SiC/SiC composite tubes for fuel cladding applications. At Oak Ridge National Laboratory, experimental capabilities are under development to characterize the modulus, microcracking, and hermeticity of as-fabricated, as-irradiated SiC/SiC composite tubes. Resonant ultrasound spectroscopy has been validated as a promising technique to evaluate the elastic properties of SiC/SiC composite tubes and microcracking within the material. A similar technique, impulse excitation, is efficient in determining the basic mechanical properties of SiC bars prepared by chemical vapor deposition; it also has potential for application in studying the mechanical properties of SiC/SiC composite tubes. Complete evaluation of the quality of the developed coatings, a major mitigation strategy against gas permeation and hydrothermal corrosion, requires the deployment of various experimental techniques, such as scratch indentation, tensile pulling-off tests, and scanning electron microscopy. In addition, a comprehensive permeation test station is being established to assess the hermeticity of SiC/SiC composite tubes and to determine the H/D/He permeability of SiC/SiC composites. This report summarizes the current status of the development of these experimental capabilities.},
doi = {10.2172/1327675},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 2016},
month = {Mon Aug 01 00:00:00 EDT 2016}
}

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