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Title: Mechanical- and physical-property changes of neutron-irradiated chemical-vapor-deposited silicon carbide

Abstract

Indentation and density measurements have revealed important changes in the mechanical and physical properties of silicon carbide (SiC) due to neutron irradiation. Specifically, the changes in the elastic modulus, hardness, fracture toughness, and density with irradiation have provided an understanding of the expected performance of SiC and SiC composites in nuclear applications. After the accumulated damage has saturated, these mechanical properties were affected primarily by the irradiation temperature. Chemical-vapor-deposited (CVD) SiC was irradiated above the saturation fluence and yielded volumetric swelling of 2.6% and 1.3% for irradiation temperatures of 100--150 C and 500--550 C, respectively. At the same respective temperatures, the elastic modulus decreased from an unirradiated value of 503 GPa to {approximately} 420 and 450 GPa. Conversely, the hardness increased from 36 GPa for the unirradiated at 100--150 C and 500--550 C, respectively. Interestingly, these two independent properties approached almost-constant levels after exposure to a fluence of 0.5 {times} 10{sup 25} n/m{sup 2}, E > 0.1 MeV. Indentation fracture toughness measurements, which were within the range of values in the literature for conventional fracture toughness procedures for SiC, increased from {approximately} 2.8 MPa{center_dot}m{sup 1/2} for the unirradiated samples to 3.7 and 4.2 MPa{center_dot}m{sup 1/2} for the samples that weremore » irradiated at 100--150 C and 500--550 C, respectively.« less

Authors:
;  [1]; ;  [2]
  1. Rensselaer Polytechnic Inst., Troy, NY (United States)
  2. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.
Publication Date:
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
684427
DOE Contract Number:  
AC05-96OR22464; FG02-92ER54181; AC05-76OR00033
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 82; Journal Issue: 9; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; PHYSICAL RADIATION EFFECTS; SILICON CARBIDES; CHEMICAL VAPOR DEPOSITION; NEUTRONS; MECHANICAL PROPERTIES; PHYSICAL PROPERTIES; TEMPERATURE DEPENDENCE; DAMAGE

Citation Formats

Osborne, M.C., Steiner, D., Hay, J.C., and Snead, L.L. Mechanical- and physical-property changes of neutron-irradiated chemical-vapor-deposited silicon carbide. United States: N. p., 1999. Web. doi:10.1111/j.1151-2916.1999.tb02108.x.
Osborne, M.C., Steiner, D., Hay, J.C., & Snead, L.L. Mechanical- and physical-property changes of neutron-irradiated chemical-vapor-deposited silicon carbide. United States. doi:10.1111/j.1151-2916.1999.tb02108.x.
Osborne, M.C., Steiner, D., Hay, J.C., and Snead, L.L. Wed . "Mechanical- and physical-property changes of neutron-irradiated chemical-vapor-deposited silicon carbide". United States. doi:10.1111/j.1151-2916.1999.tb02108.x.
@article{osti_684427,
title = {Mechanical- and physical-property changes of neutron-irradiated chemical-vapor-deposited silicon carbide},
author = {Osborne, M.C. and Steiner, D. and Hay, J.C. and Snead, L.L.},
abstractNote = {Indentation and density measurements have revealed important changes in the mechanical and physical properties of silicon carbide (SiC) due to neutron irradiation. Specifically, the changes in the elastic modulus, hardness, fracture toughness, and density with irradiation have provided an understanding of the expected performance of SiC and SiC composites in nuclear applications. After the accumulated damage has saturated, these mechanical properties were affected primarily by the irradiation temperature. Chemical-vapor-deposited (CVD) SiC was irradiated above the saturation fluence and yielded volumetric swelling of 2.6% and 1.3% for irradiation temperatures of 100--150 C and 500--550 C, respectively. At the same respective temperatures, the elastic modulus decreased from an unirradiated value of 503 GPa to {approximately} 420 and 450 GPa. Conversely, the hardness increased from 36 GPa for the unirradiated at 100--150 C and 500--550 C, respectively. Interestingly, these two independent properties approached almost-constant levels after exposure to a fluence of 0.5 {times} 10{sup 25} n/m{sup 2}, E > 0.1 MeV. Indentation fracture toughness measurements, which were within the range of values in the literature for conventional fracture toughness procedures for SiC, increased from {approximately} 2.8 MPa{center_dot}m{sup 1/2} for the unirradiated samples to 3.7 and 4.2 MPa{center_dot}m{sup 1/2} for the samples that were irradiated at 100--150 C and 500--550 C, respectively.},
doi = {10.1111/j.1151-2916.1999.tb02108.x},
journal = {Journal of the American Ceramic Society},
number = 9,
volume = 82,
place = {United States},
year = {1999},
month = {9}
}