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Gap Energy of Superconducting Niobium Carbide
Physical Review B, 1971The first estimate of the superconducting energy gap in a transition-metal carbide was recently made from thermal conductivity data on Nb${\mathrm{C}}_{0.96}$ The quantity $\frac{2\ensuremath{\epsilon}(0)}{k{T}_{c}}$ was treated as an adjustable parameter in fitting the data to Bardeen-Rickayzen-Tewordt (BRT) theory, and a good fit was found for $2 ...
L. W. Shacklette +2 more
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Synthesis of niobium carbides in copper melts
Russian Metallurgy (Metally), 2010The production of cast composite Cu-NbC alloys by synthesizing of niobium carbides in a copper melt is studied. The processes of carbide formation are intensified by the mechanical activation of niobium and graphite powders, which are mixed with a copper melt, in a high-speed ball mill and by the action of low-frequency vibrations on copper melts.
L. E. Bodrova +4 more
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Sintering of alumina-niobium carbide composite
International Journal of Refractory Metals and Hard Materials, 1998Abstract Several studies have been focused on particulate-dispersed Al 2 O 3 composites in order to improve both room and high temperature mechanical properties and wear resistance. In the present work Al 2 O 3 -NbC composites have been pressureless sintered and their microstructures analysed as a function of NbC and Y 2 O 3 concentration, the ...
Rosa M.R. Pasotti +2 more
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Properties of zirconium carbide -niobium carbide alloys in their homogeneity region
Soviet Powder Metallurgy and Metal Ceramics, 19711. A study was made of the electrical resistivity, thermo-emf, Hall coefficient, magnetic susceptibility, and temperature dependence of electrical resistivity and thermo-emf (at 50–1000°C) of binary solid solutions of zirconium and niobium carbides in their homogeneity region (C/Me =0.9–1.0). 2.
G. V. Samsonov, G. Sh. Upadkhaya
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A kinetic study on oxidation of niobium carbide
Solid State Ionics, 1993Abstract The isothermal oxidation of NbC powders was carried out at temperatures of 420–600°C and oxygen pressures of 4, 8 and 16 kPa, using an electro-microbalance. The oxidation process was divided into three steps I to III. In step I, oxidation occurs linearly in initial period (a degree of oxidation (α)
Shiro Shimada, Michio Inagaki
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Hot isostatic pressing of niobium carbide
Materials Science and Engineering, 1982The mechanical properties of the transition metal carbides have made them technologically significant for many years. Among the studies on fabrication procedures only a miner percentage has been involved with sintering in the absence of sizable amounts of liquid place.
S. Chevacharoenkul +2 more
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Some features of the sintering of niobium carbide
Soviet Powder Metallurgy and Metal Ceramics, 1965A study was made of the sintering of niobium carbide in electric furnaces. It is shown that niobium carbide parts can be sintered at relatively low temperatures (2400–2500°C) if activating additions are used. An addition of ammonium chloride activates sintering by creating a defective structure, which results in a considerable intensification of the ...
A. D. Panasyuk, P. S. Kislyi
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On the Fabrication of Niobium-Carbide Powders by the Reaction of Niobium with Acetone
Nanobiotechnology Reports, 2023V. N. Kolosov, M. N. Miroshnichenko
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High-Temperature Heat Content of Niobium Carbide and of Tantalum Carbide
The Journal of Chemical Physics, 1963The heat content of niobium carbide was measured between 1289° and 2778°K and that of tantalum carbide between 1296° and 2843°K using a drop calorimeter.
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