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Title: Rate-controlling factors in the carbothermic preparation of UO/sub 2/-UC/sub 2/-C microspheres

Abstract

Rate-controlling factors in the conversion of UO/sub 2/ + C microspheres to UC/sub 2/ + C were investigated using a fluidized-bed furnace (13 cm in diam). Examination by x-ray diffraction, ion microprobe, and microstructural observation revealed that the conversion of UO/sub 2/ to UC/sub 2/ began at the surface of the microsphere and progressed toward the central unreacted core. Kinetic models for solid state reactions in spheres were evaluated by using quantitative mass spectrometric data on the rate of evolution of CO during conversion. This analysis revealed that the rate of conversion was controlled by reaction at the outer surface of the microsphere. Also, decreased partial pressures of CO accelerated the rate of reaction.

Authors:
; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN
OSTI Identifier:
5523119
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Am. Ceram. Soc.; (United States); Journal Volume: 61:11-12
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; HTGR TYPE REACTORS; NUCLEAR FUELS; URANIUM CARBIDES; CHEMICAL PREPARATION; CARBON MONOXIDE; CARBONIZATION; MICROSPHERES; MICROSTRUCTURE; PRODUCTION; ACTINIDE COMPOUNDS; CARBIDES; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; CRYSTAL STRUCTURE; DECOMPOSITION; ENERGY SOURCES; FUELS; GAS COOLED REACTORS; GRAPHITE MODERATED REACTORS; MATERIALS; OXIDES; OXYGEN COMPOUNDS; REACTOR MATERIALS; REACTORS; SYNTHESIS; URANIUM COMPOUNDS; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication; 360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies; 210300 - Power Reactors, Nonbreeding, Graphite Moderated

Citation Formats

Stinton, D.P., Tiegs, S.M., Lackey, W.J., and Lindemer, T.B.. Rate-controlling factors in the carbothermic preparation of UO/sub 2/-UC/sub 2/-C microspheres. United States: N. p., 1979. Web. doi:10.1111/j.1151-2916.1979.tb12740.x.
Stinton, D.P., Tiegs, S.M., Lackey, W.J., & Lindemer, T.B.. Rate-controlling factors in the carbothermic preparation of UO/sub 2/-UC/sub 2/-C microspheres. United States. doi:10.1111/j.1151-2916.1979.tb12740.x.
Stinton, D.P., Tiegs, S.M., Lackey, W.J., and Lindemer, T.B.. Thu . "Rate-controlling factors in the carbothermic preparation of UO/sub 2/-UC/sub 2/-C microspheres". United States. doi:10.1111/j.1151-2916.1979.tb12740.x.
@article{osti_5523119,
title = {Rate-controlling factors in the carbothermic preparation of UO/sub 2/-UC/sub 2/-C microspheres},
author = {Stinton, D.P. and Tiegs, S.M. and Lackey, W.J. and Lindemer, T.B.},
abstractNote = {Rate-controlling factors in the conversion of UO/sub 2/ + C microspheres to UC/sub 2/ + C were investigated using a fluidized-bed furnace (13 cm in diam). Examination by x-ray diffraction, ion microprobe, and microstructural observation revealed that the conversion of UO/sub 2/ to UC/sub 2/ began at the surface of the microsphere and progressed toward the central unreacted core. Kinetic models for solid state reactions in spheres were evaluated by using quantitative mass spectrometric data on the rate of evolution of CO during conversion. This analysis revealed that the rate of conversion was controlled by reaction at the outer surface of the microsphere. Also, decreased partial pressures of CO accelerated the rate of reaction.},
doi = {10.1111/j.1151-2916.1979.tb12740.x},
journal = {J. Am. Ceram. Soc.; (United States)},
number = ,
volume = 61:11-12,
place = {United States},
year = {Thu Nov 01 00:00:00 EST 1979},
month = {Thu Nov 01 00:00:00 EST 1979}
}