The ZrC–C eutectic structure and melting behaviour: A high-temperature radiance spectroscopy study

Manara, D.; Jackson, H.; Perinetti-Casoni, C.; Boboridis, K.; Welland, M.J.; Luzzi, L.; Ossi, P.M.; Lee, William

doi:10.1016/j.jeurceramsoc.2012.12.008

Cited by 21 publications

(14 citation statements)

References 27 publications

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“…Zirconium carbide has potential in ultrahigh‐temperature applications such as for coatings on hypersonic vehicles or as an inert matrix fuel in the nuclear industry . ZrC has better properties than other carbides such as a higher thermal conductivity and higher melting point, however, a comprehensive database on its properties is not available and therefore its use is rarely considered …”

Section: Introductionmentioning

confidence: 99%

“…Zirconium carbide has potential in ultrahigh-temperature applications such as for coatings on hypersonic vehicles 1,2 or as an inert matrix fuel in the nuclear industry. 3,4 ZrC has better properties than other carbides such as a higher thermal conductivity and higher melting point, [5][6][7][8] however, a comprehensive database on its properties is not available and therefore its use is rarely considered. 9 The oxidation of ZrC has been studied [10][11][12][13][14][15][16][17][18][19] under several experimental conditions of temperature and pressure [10][11][12][13][14] but a clear understanding has not yet been achieved due to the large numbers of variables that affect it, such as chemical composition of the initial material (C/Zr stoichiometry), porosity, or grain size.…”

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confidence: 99%

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Zirconium carbide oxidation: Kinetics and oxygen diffusion through the intermediate layer

et al. 2018

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Oxidation of hot‐pressed ZrC was investigated in air in the 1073‐1373 K range. The kinetics were linear at 1073 K, whereas at higher temperature samples initially followed linear kinetics before undergoing rapid oxidation leading to a Maltese cross shape of the oxide. The linear kinetics at 1073 K was governed by inward oxygen diffusion through an intermediate layer of constant thickness between ZrC and ZrO2 which was comprised of amorphous carbon and ZrO2 nanocrystals. Diffusion of oxygen through the intermediate layer was measured to be 9 × 10−10 cm2 s−1 using 18O as a tracer in a double oxidation experiment in 16O/18O. Oxidation at 1073 and 1173 K produced samples made of m‐ZrO2 and either t‐ or c‐ZrO2 with an adherent intermediate layer made of amorphous carbon and ZrO2, whereas oxidation at 1273 and 1373 K produced samples with a voluminous oxide made of m‐ZrO2 showing a gap between ZrC and the oxide. A substoichiometric zirconia layer was found at the gap at 1273 K and no carbon uptake was detected in this layer when compared with the top oxide layer. The loss of the intermediate layer and the slowdown of the linear rate constant (g m−2 s−1) at 1273 K compared to 1173 K was correlated with the preferential oxidation of carbon at the intermediate layer which would leave as CO and/or CO2 leaving a gap between ZrC and substoichiometric zirconia.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Zirconium carbide oxidation: Kinetics and oxygen diffusion through the intermediate layer

et al. 2018

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“…The gap between the normal spectral emissivity of solid and liquid ZrC is observed in the spectral frequency range from PHz 0.545 to PHz 333 . 0 [41]. The normal spectral emissivity of both solid and liquid zirconium carbide increase with increasing v.…”

Section: Thermal Radiative and Thermodynamic Properties Of Liquid Andmentioning

confidence: 93%

“…In at the eutectic melting (freezing) temperature T = 3155 K. As it can be clearly seen, the gaps between the thermal radiative and thermodynamic functions of liquid and solid zirconium carbide are observed. The existence of these gaps indicates that liquid ZrC has probably a more metallic nature than solid ZrC [41].…”

Section: Number Density Of Photons With a Photon Energy Frommentioning

confidence: 99%

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Polylogarithmic Representation of Radiative and Thermodynamic Properties of Thermal Radiation in a Given Spectral Range: II. Real-Body Radiation

Fisenko¹,

Lemberg²

2015

Int J Thermophys

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The general analytical expressions for the thermal radiative and thermodynamic properties of a realbody are obtained in a finite range of frequencies at different temperatures. The frequency dependence of the spectral emissivity is represented as a power series. Stefan-Boltzmann's law, total energy density, number density of photons, Helmholtz free energy density, internal energy density, enthalpy density, entropy density, heat capacity at constant volume, pressure, and total emissivity are expressed in terms of the polylogarithm functions. The general expressions for the thermal radiative and thermodynamic functions are applied for the study of thermal radiation of liquid and solid zirconium carbide. These functions are calculated using experimental data for the frequency dependence of the normal spectral emissivity in the visible-near infrared range at the melting (freezing) point. The gaps between the thermal radiative and thermodynamic functions of liquid and solid zirconium carbide are observed. The general analytical expressions obtained can easily be presented in wavenumber domain.

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Zirconium Monocarbide

Shabalin¹

2019

Ultra-High Temperature Materials II

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The ZrC–C eutectic structure and melting behaviour: A high-temperature radiance spectroscopy study

Cited by 21 publications

References 27 publications

Zirconium carbide oxidation: Kinetics and oxygen diffusion through the intermediate layer

Zirconium carbide oxidation: Kinetics and oxygen diffusion through the intermediate layer

Polylogarithmic Representation of Radiative and Thermodynamic Properties of Thermal Radiation in a Given Spectral Range: II. Real-Body Radiation

Zirconium Monocarbide

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