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Title: The effects of neutron irradiation on shear properties at the monolayered PyC and the multilayered PyC/SiC interfaces of SiC/SiC composites

Abstract

The effect of neutron irradiation on mechanical properties at the fiber/matrix interface of SiC/SiC composites was evaluated. The materials investigated were Hi-Nicalon Type-S fiber reinforced chemically vapor infiltrated SiC matrix composites with varied interphases: monolayered pyrolytic carbon (PyC) or multilayered PyC/SiC. The neutron fluence was 7.7 1025 n/m2 (E>0.1 MeV), and the irradiation temperature was 800 C. Interfacial shear properties were evaluated by the fiber push-out test method. A modified shear-lag model was applied to analyze the interfacial shear parameters. Test results indicate that the interfacial debond shear strength and the interfacial friction stress for the multilayer composites were significantly degraded by irradiation. Nevertheless, the multilayer composites retained sufficient interfacial shear properties so that overall composite strength after neutron irradiation was unaffected. The actual mechanism of interphase property decrease for the multilayer composites is unknown. The interfacial shear properties of the irradiated monolayer composites contrarily appear unaffected.

Authors:
 [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Flux Isotope Reactor
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
978102
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 367; Journal Issue: 1; Journal ID: ISSN 0022-3115
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; FIBERS; FRICTION; IRRADIATION; MECHANICAL PROPERTIES; NEUTRON FLUENCE; NEUTRONS; PYROLYTIC CARBON; SHEAR; SHEAR PROPERTIES

Citation Formats

Nozawa, Takashi, Katoh, Yutai, and Snead, Lance Lewis. The effects of neutron irradiation on shear properties at the monolayered PyC and the multilayered PyC/SiC interfaces of SiC/SiC composites. United States: N. p., 2007. Web. doi:10.1016/j.jnucmat.2007.03.096.
Nozawa, Takashi, Katoh, Yutai, & Snead, Lance Lewis. The effects of neutron irradiation on shear properties at the monolayered PyC and the multilayered PyC/SiC interfaces of SiC/SiC composites. United States. doi:10.1016/j.jnucmat.2007.03.096.
Nozawa, Takashi, Katoh, Yutai, and Snead, Lance Lewis. Mon . "The effects of neutron irradiation on shear properties at the monolayered PyC and the multilayered PyC/SiC interfaces of SiC/SiC composites". United States. doi:10.1016/j.jnucmat.2007.03.096.
@article{osti_978102,
title = {The effects of neutron irradiation on shear properties at the monolayered PyC and the multilayered PyC/SiC interfaces of SiC/SiC composites},
author = {Nozawa, Takashi and Katoh, Yutai and Snead, Lance Lewis},
abstractNote = {The effect of neutron irradiation on mechanical properties at the fiber/matrix interface of SiC/SiC composites was evaluated. The materials investigated were Hi-Nicalon Type-S fiber reinforced chemically vapor infiltrated SiC matrix composites with varied interphases: monolayered pyrolytic carbon (PyC) or multilayered PyC/SiC. The neutron fluence was 7.7 1025 n/m2 (E>0.1 MeV), and the irradiation temperature was 800 C. Interfacial shear properties were evaluated by the fiber push-out test method. A modified shear-lag model was applied to analyze the interfacial shear parameters. Test results indicate that the interfacial debond shear strength and the interfacial friction stress for the multilayer composites were significantly degraded by irradiation. Nevertheless, the multilayer composites retained sufficient interfacial shear properties so that overall composite strength after neutron irradiation was unaffected. The actual mechanism of interphase property decrease for the multilayer composites is unknown. The interfacial shear properties of the irradiated monolayer composites contrarily appear unaffected.},
doi = {10.1016/j.jnucmat.2007.03.096},
journal = {Journal of Nuclear Materials},
issn = {0022-3115},
number = 1,
volume = 367,
place = {United States},
year = {2007},
month = {1}
}