Thermophysical characterisation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mtext>ZrC</mml:mtext></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>N</mml:mtext></mml:mrow><mml:mrow><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> ceramics fabricated via carbothermic reduction–nitridation

Harrison, R. W.; Ridd, O.; Jayaseelan, Daniel Doni; Lee, William

doi:10.1016/j.jnucmat.2014.07.030

Cited by 26 publications

(23 citation statements)

References 36 publications

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“…Lengauer et al 50 produced the desired compositions by mixing of commercially available ZrC and ZrN powders, and chemical analysis was performed by combustion gas analysis. Harrison et al 60 prepared the ZrC x N y powders via carbothermic reduction-nitridation, and stoichiometries are reported from combustion gas analysis. The trend in increasing thermal conductivity with increasing nitrogen content was attributed to a higher number of electrons contributing to thermal conductivity with increasing nitrogen content as determined by electrical conductivity measurements (presented in the following section).…”

Section: 61mentioning

confidence: 99%

Processing and properties of ZrC, ZrN and ZrCN ceramics: a review

Harrison

Lee

2016

Advances in Applied Ceramics

177

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ZrC and ZrN ceramics are of interest in the application of materials in extreme high temperature environments, particularly for nuclear applications in generation IV reactors. These materials demonstrate desirable characteristics such as high thermal and electrical conductivities along with high hardness and melting temperatures. Data reported in the literature often suffer from scatter due to differences in processing techniques and difficulty determining stoichiometry, which will significantly affect thermophysical properties. This article reviews the current available data for the properties of ZrC, ZrN and mixed carbonitrides phases and identifies causes of scatter in the literature and areas requiring further research.

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Section: 61mentioning

confidence: 99%

Processing and properties of ZrC, ZrN and ZrCN ceramics: a review

Harrison

Lee

2016

Advances in Applied Ceramics

177

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“…However difficulty in determining purity and stoichiometry of these materials has lead to much scatter in these properties with the bulk of experimental data being presented for commercially available powders [9][10][11][12][13]. Our work has shown that thermal conductivity of ZrC x N y ceramics increases with increasing nitrogen content [14].…”

Section: Introductionmentioning

confidence: 88%

On the fabrication of ZrC x N y from ZrO 2 via two-step carbothermic reduction–nitridation

Harrison

Rapaud

Pradeilles

et al. 2015

Journal of the European Ceramic Society

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This study examined the processing parameters of a two-step carbothermal reduction-nitridation of ZrO 2 as a UO 2 /PuO 2 simulant to fabricate ZrN. Variables studied were the reaction time, reaction temperature and the 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 that 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 N 2(g) forming the nitride. Annealing experiments on these mixed phases shows formation of a solid solution is rapid compared to the nitridation, where there is no formation of a mixed phase.

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“…В работах [8,9] возможность образования карбонитрида Zr в ходе карботермического восстановления-азотирования оксида ZrO2 изучали по смещению угла дифракции и уширения линий в интервале 2θ от 55 до 75°. На рисунке 3 показана дифрактограмма синтезированных в настоящей работе порошков в сравнении с литературными данными.…”

Section: рисунок 1 -зависимость концентрации O N и C в порошке от врunclassified

“…Рисунок 3 -Дифрактограмма азотированных порошков: а)настоящая работа;б) литературные данные(в скобочках указан режим азотирования в токе азота) [8,9] …”

Section: рисунок 1 -зависимость концентрации O N и C в порошке от врunclassified

“…Это обусловлено фактически постоянным отношением концентраций N/C ≈ 0,15 в порошках, изготовленных по всем режимам (рисунок 1). Собственно значение периода решѐтки равно 0,4691 нм, что, согласно [8], отвечает практически чистому карбиду ZrC.…”

Section: рисунок 1 -зависимость концентрации O N и C в порошке от врunclassified

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