Thermophysical characterisation of ZrCx Ny ceramics fabricated via carbothermic reduction-nitridation

R. Harrison, O. Ridd, D. D. Jayaseelan, W. E. Lee

Research output: Contribution to journalArticle

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Abstract

Thermophysical properties of ZrCxNy ceramics prepared from powders produced via a two-step carbothermic reduction-nitridation of zirconia were characterised to 2200 K. Preliminary evidence for the mechanism of nitridation shows a gas-solid phase reaction at the ZrC particle surface which is the first such observation with this system. Electrical and thermal conductivities were higher than commercially available ZrC and ZrN. Thermal conductivity values of the ZrCxNy phases at room temperature were between 35 and 43 Wm-1 K-1, increasing with nitrogen content due to increased electronic contribution to thermal conduction and increased to 40-50 Wm-1 K-1 with temperature. Electrical conductivity also increased with nitrogen content and values were in the range of 100-450 × 104Ω-1 m1, but decreased with increasing temperature showing metallic behaviour. © 2014 Elsevier B.V. All rights reserved.
LanguageEnglish
Pages46-53
Number of pages8
JournalJournal of Nuclear Materials
Volume454
Issue number1-3
Early online date27 Jul 2014
DOIs
Publication statusPublished - Nov 2014
Externally publishedYes

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Carbothermal reduction
Nitridation
thermal conductivity
ceramics
nitrogen
electrical resistivity
Thermal conductivity
thermophysical properties
Nitrogen
zirconium oxides
solid phases
conduction
Zirconia
Powders
Temperature
temperature
room temperature
Thermodynamic properties
Gases
electronics

Cite this

Harrison, R. ; Ridd, O. ; Jayaseelan, D. D. ; Lee, W. E. / Thermophysical characterisation of ZrCx Ny ceramics fabricated via carbothermic reduction-nitridation. In: Journal of Nuclear Materials. 2014 ; Vol. 454, No. 1-3. pp. 46-53.
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Thermophysical characterisation of ZrCx Ny ceramics fabricated via carbothermic reduction-nitridation. / Harrison, R.; Ridd, O.; Jayaseelan, D. D.; Lee, W. E.

In: Journal of Nuclear Materials, Vol. 454, No. 1-3, 11.2014, p. 46-53.

Research output: Contribution to journalArticle

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AB - Thermophysical properties of ZrCxNy ceramics prepared from powders produced via a two-step carbothermic reduction-nitridation of zirconia were characterised to 2200 K. Preliminary evidence for the mechanism of nitridation shows a gas-solid phase reaction at the ZrC particle surface which is the first such observation with this system. Electrical and thermal conductivities were higher than commercially available ZrC and ZrN. Thermal conductivity values of the ZrCxNy phases at room temperature were between 35 and 43 Wm-1 K-1, increasing with nitrogen content due to increased electronic contribution to thermal conduction and increased to 40-50 Wm-1 K-1 with temperature. Electrical conductivity also increased with nitrogen content and values were in the range of 100-450 × 104Ω-1 m1, but decreased with increasing temperature showing metallic behaviour. © 2014 Elsevier B.V. All rights reserved.

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