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Title: Non-Destructive Screening During Fabrication for High Strength SiC Ceramic Cladding

Authors:
 [1]
  1. Ceramic Tubular Products, LLC, Lynchburg, VA (United States)
Publication Date:
Research Org.:
Ceramic Tubular Products, LLC, Lynchburg, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1326221
Report Number(s):
CTP-13725-001
DOE Contract Number:
SC0013725
Type / Phase:
SBIR
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS

Citation Formats

Halfinger, Jeffrey. Non-Destructive Screening During Fabrication for High Strength SiC Ceramic Cladding. United States: N. p., 2016. Web.
Halfinger, Jeffrey. Non-Destructive Screening During Fabrication for High Strength SiC Ceramic Cladding. United States.
Halfinger, Jeffrey. 2016. "Non-Destructive Screening During Fabrication for High Strength SiC Ceramic Cladding". United States. doi:.
@article{osti_1326221,
title = {Non-Destructive Screening During Fabrication for High Strength SiC Ceramic Cladding},
author = {Halfinger, Jeffrey},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 9
}

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  • The objective of the program is to establish a mechanical-property data base that can be used to predict the performance of Zircaloy cladding under various postulated off-normal, transient, and accident conditions in a power reactor. Progress is summarized in spent fuel rod characterization, tensile tests, development of nonlinear data-analysis techniques, comparison of isothermal and anisothermal uniform-elongation tensile data, and transient-heating tube burst tests.
  • Hydrogen, oxygen, and nitrogen analyses were penformed on the Zircaloy-2 cladding of some fuel rods prior to hot extrusion, following hot extrusion, after cold drawing, and subsequent to nitric acid pickling. Analyses were also conducted on Zircaloy-2 which had not been subjected to extrusion or drawing, but only to pickling. Results of these analyses indicate that hydrogen, oxygen, and nitrogen are not picked up by Zircaloy-2 during the fabrication of fuel rods by the process presented. (auth)
  • Sol-gel processes are being investigated to prepare sinterable ceramic powders of alumina toughened with 10 to 30 vol % phase-stabilized zirconia and of alumina reinforced with silicon carbide whiskers. Two approaches are under investigation for the synthesis of gel powders of Al/sub 2/O/sub 3/-ZrO/sub 2/: (1) gelation of the mixed-oxide precursor sols, and (2) direct precipitation of the mixed-oxide gels from solutions of the metal salts. Either approach yields powders of good sinterability in which Al/sub 2/O/sub 3/ and ZrO/sub 2/ are homogeneously mixed. The powders sinter to near theoretical density by hot pressing to give fine-grained microstructures (approx.1 ..mu..m).more » Powder sinterability and compositional uniformity are strongly influenced by the pH at which the gel powder is formed. The best sinterability is attained at pH values such that the surface charges on ZrO/sub 2/ and Al/sub 2/O/sub 3/ are of the same sign, which reduces agglomeration. Methods for controlling the homogeneity of the phase stabilizer for ZrO/sub 2/ (usually 1 to 5 mole % Y/sub 2/O/sub 3/) were also investigated. Good homogeneity of Y/sub 2/O/sub 3/ is most readily attained by effecting the sol-gel transformation at neutral or alkaline conditions. Alumina powders reinforced with 10 to 20 vol % SiC whiskers were prepared by dispersing the SiC whiskers into an alumina sol of pH 3.5, where the surface charges of SiC and Al/sub 2/O/sub 3/ are of opposite sign, and then gelling this dispersion. The whisker dispersions are uniform throughout the powder particles and appear uniformly coated by the alumina.« less