On the fabrication of ZrCxNy from ZrO2 via two-step carbothermic reduction-nitridation

R. Harrison, O. Rapaud, N. Pradeilles, A. Maître, W.E. Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Processing parameters of a two-step carbothermal reduction-nitridation of ZrO2 as a UO2/PuO2 simulant to fabricate ZrN and ZrCxNywere examined. Variables studied were reaction time, reaction temperature and starting powder composition. Higher temperatures, longer reaction times and higher initial amounts of carbon in the starting material lead to increased nitridation similar to previous work with uranium oxide but reaction rate decreases with time. SEM and TEM of the reacted powders reveal regions of ZrC with ledges indicative of crystal defects with small particles of ZrN growing on the ZrC bulk material suggesting a reaction that occurs via Zr transport to the reaction site either through mass diffusion or evaporation-condensation of Zr(g) and with N2(g) forming the nitride. Annealing experiments on these mixed phases show formation of a solid solution which is rapid compared to the nitridation, where there is little to no formation of a solid solution.
Original languageEnglish
JournalJournal of the European Ceramic Society
Volume35
Issue number5
Early online date2 Dec 2014
DOIs
Publication statusPublished - May 2015
Externally publishedYes

Fingerprint

Carbothermal reduction
Nitridation
Fabrication
Powders
Solid solutions
Crystal defects
Nitrides
Uranium
Reaction rates
Condensation
Evaporation
Carbon
Annealing
Transmission electron microscopy
Temperature
Scanning electron microscopy
Oxides
Processing
Chemical analysis
Experiments

Cite this

Harrison, R. ; Rapaud, O. ; Pradeilles, N. ; Maître, A. ; Lee, W.E. / On the fabrication of ZrCxNy from ZrO2 via two-step carbothermic reduction-nitridation. In: Journal of the European Ceramic Society. 2015 ; Vol. 35, No. 5.
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abstract = "Processing parameters of a two-step carbothermal reduction-nitridation of ZrO2 as a UO2/PuO2 simulant to fabricate ZrN and ZrCxNywere examined. Variables studied were reaction time, reaction temperature and starting powder composition. Higher temperatures, longer reaction times and higher initial amounts of carbon in the starting material lead to increased nitridation similar to previous work with uranium oxide but reaction rate decreases with time. SEM and TEM of the reacted powders reveal regions of ZrC with ledges indicative of crystal defects with small particles of ZrN growing on the ZrC bulk material suggesting a reaction that occurs via Zr transport to the reaction site either through mass diffusion or evaporation-condensation of Zr(g) and with N2(g) forming the nitride. Annealing experiments on these mixed phases show formation of a solid solution which is rapid compared to the nitridation, where there is little to no formation of a solid solution.",
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On the fabrication of ZrCxNy from ZrO2 via two-step carbothermic reduction-nitridation. / Harrison, R.; Rapaud, O.; Pradeilles, N.; Maître, A.; Lee, W.E.

In: Journal of the European Ceramic Society, Vol. 35, No. 5, 05.2015.

Research output: Contribution to journalArticle

TY - JOUR

T1 - On the fabrication of ZrCxNy from ZrO2 via two-step carbothermic reduction-nitridation

AU - Harrison, R.

AU - Rapaud, O.

AU - Pradeilles, N.

AU - Maître, A.

AU - Lee, W.E.

PY - 2015/5

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AB - Processing parameters of a two-step carbothermal reduction-nitridation of ZrO2 as a UO2/PuO2 simulant to fabricate ZrN and ZrCxNywere examined. Variables studied were reaction time, reaction temperature and starting powder composition. Higher temperatures, longer reaction times and higher initial amounts of carbon in the starting material lead to increased nitridation similar to previous work with uranium oxide but reaction rate decreases with time. SEM and TEM of the reacted powders reveal regions of ZrC with ledges indicative of crystal defects with small particles of ZrN growing on the ZrC bulk material suggesting a reaction that occurs via Zr transport to the reaction site either through mass diffusion or evaporation-condensation of Zr(g) and with N2(g) forming the nitride. Annealing experiments on these mixed phases show formation of a solid solution which is rapid compared to the nitridation, where there is little to no formation of a solid solution.

KW - Carbonitride

KW - Carbothermal reduction

KW - Inert matrix fuel

KW - Nitridation

KW - Nuclear fuel

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