Results 211 to 220 of about 12,064 (254)
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Recrystallization of niobium and zirconium carbides
Soviet Powder Metallurgy and Metal Ceramics, 1977The temperature level at the beginning of recrystallization of transition metal carbides depends on the degree of their homogeneity, their reaction with oxygen in the course of deformation and annealing, and the stability of the resultant oxide phases.
A. E. Kravchik +3 more
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Lattice dynamics of niobium carbide (NbC)
Solid State Communications, 1984Abstract A consistent and comprehensive approach has been adopted to derive the framework of a deformation dipole model (DDM) which is capable of explaining successfully the lattice dynamics of ionic crystals. The application of this model to the case of the niobium carbide crystal has reproduced fairly well the phonon dispersion curves.
R.B. Yadav, K.C. Thakur
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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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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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Densification of nonstoichiometric niobium-carbide phases
Soviet Powder Metallurgy and Metal Ceramics, 19681. A study was made of the influence of temperature on the density of compacts produced from powders of nonstoichiometric NbCX phases of approximately the same specific surface area. It was established that, with increasing carbon deficiency, the relative density at any given temperature increases, because the diffusional mobility of the carbon and ...
S. S. Ordan'yan +2 more
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Niobium Carbide Precipitation in Microalloyed Steel
steel research international, 2004The precipitation of niobium carbo‐nitrides in the austenite phase, interphase and ferrite phase of microalloyed steel was assessed by a critical literature review and a round table discussion. This work analyses the contribution of niobium carbide precipitates formed in ferrite in the precipitation hardening of commercially hot rolled strip ...
Christian Klinkenberg +2 more
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Thermal expansion of some niobium carbides
Journal of the Less Common Metals, 1967Abstract The thermal expansions of the cubic compounds NbC0.924, NbC0.825, NbC0.766, and NbC0.702 were determined between 25 ...
C.P. Kempter, E.K. Storms
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Materials Research Bulletin, 1979
Abstract The high temperature reaction of niobium pentoxide with niobium carbide and titanium carbide has been studied to investigate the feasibility of direct preparation of NbTi alloys and the titanium deoxidation tendency of niobium. Starting with oxide-carbide charges with o:c mole ratio varying from 1.01 to 1.10 and titanium content varying from
N. Krishnamurthy +2 more
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Abstract The high temperature reaction of niobium pentoxide with niobium carbide and titanium carbide has been studied to investigate the feasibility of direct preparation of NbTi alloys and the titanium deoxidation tendency of niobium. Starting with oxide-carbide charges with o:c mole ratio varying from 1.01 to 1.10 and titanium content varying from
N. Krishnamurthy +2 more
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Niobium carbide heaters used in growing silicon carbide single crystals
Soviet Powder Metallurgy and Metal Ceramics, 1986Silicon carbide single crystals can be grown by sublimation by using a furnace with niobium carbide heaters. The working life of these heaters is much greater than that of graphite ones. The crystals are suitable for making light-emitting diodes.
V. S. Kindysheva +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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