Journal ArticleDOI
Hot-pressing kinetics of zirconium carbide
TLDR
In this paper, the activation energy of ZrC hot-pressing was calculated, starting from the viscosity calculated by Murray's formula, as 41 kcal mol−1 (171.7 kJmol−1).Abstract:
The hot-pressing kinetics of zirconium carbide were studied between 1700 and 2400° C in argon. The validity of different theoretical models due to Murray, Koval'chenko, Skorokhod, Scholz and Lersmacher was tested. For temperatures exceeding 2200° C, there is reasonably good agreement between kinetics and the whole set of models, but it has not been possible to classify them in order to draw conclusions on the sintering mechanism. The activation energy of ZrC hot-pressing was calculated, starting from the viscosity calculated by Murray's formula, as 41 kcal mol−1 (171.7 kJ mol−1).read more
Citations
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Journal ArticleDOI
Spark plasma sintering and mechanical behaviour of ZrC-based composites
TL;DR: In this paper, MoSi2 was used as a sintering aid in the volumetric range 0.9 to 9 vol.% for ZrC materials with hardness and flexural strength in the range 25-28 GPa.
Journal ArticleDOI
Carbothermal reduction synthesis of nanocrystalline zirconium carbide and hafnium carbide powders using solution-derived precursors
TL;DR: In this paper, Zirconium carbide (ZrC) and HfC powders were produced by the carbothermal reduction reaction of carbon and the corresponding metal oxide (HfO2 and ZrO2, respectively).
Journal ArticleDOI
Solid state reaction of zirconia with carbon
Alexandre Maitre,Pierre Lefort +1 more
TL;DR: In this paper, a solid-solid reaction between zirconia and carbon under flowing argon produces ZrC0.84O0.06 +1.39 O 2 and 2.78 CO.
Journal ArticleDOI
A study of the densification mechanisms during spark plasma sintering of zirconium (oxy-)carbide powders
TL;DR: In this article, the densification mechanism of zirconium oxycarbide powders during the spark plasma sintering (SPS) under several applied loads (25, 50, 100 MPa) was studied.
Book
Ultra-High Temperature Materials II: Refractory Carbides I (Ta, Hf, NB and Zr Carbides)
TL;DR: In this paper, a thorough treatment of ultra-high temperature materials with melting points around or over 2500 °C is presented, which can be applied in various engineering devices and environmental conditions in the wide range from cryogenic to ultra high temperatures, on the basis of the latest updates in the field of physics, chemistry, nanotechnology, materials science and engineering.
References
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Journal ArticleDOI
Diffusional Viscosity of a Polycrystalline Solid
TL;DR: In this article, it is suggested that mosaic boundaries and boundaries between grains of nearly the same orientation may not serve as sources or sinks of the diffusion currents, in which case the creep rate will depend only on the configuration of grain boundaries having a sizable orientation differen...
Journal ArticleDOI
A Model for Boundary Diffusion Controlled Creep in Polycrystalline Materials
TL;DR: In this article, the authors discussed the mechanism of creep in polycrystalline alumina based on the differences between the lattice and boundary diffusion models and showed that the boundary diffusion model is more stable than lattice diffusion model, while the grain size dependence and the numerical constant are greater.
Journal ArticleDOI
Diffusion of Carbon through Zirconium Monocarbide
S. Sarian,J. M. Criscione +1 more
TL;DR: In this article, the diffusion coefficients of carbon in single and polycrystalline ZrC have been measured in the temperature range 1350°-2150°C, using radioactive tracer techniques.