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Pressureless sintering of single-phase tantalum carbide and niobium carbide
Journal of the European Ceramic Society, 2013Abstract This work presents the results of studies on the preparation of single-phase polycrystalline tantalum carbide and niobium carbide. It has been found that it is possible to obtain polycrystals with high density in the pressureless sintering process at temperatures up to 2000 °C and therefore relatively low temperatures such as for the ...
Agnieszka Gubernat
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Materials Chemistry and Physics, 2004 There are a lot of technologically interesting characteristics of niobium carbide coating deposited by pack method which is the production of hard, wear-resistant, oxidation and Corrosion resistant coating layer on the steel substrates.
Uğur Sen
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Sliding wear behavior of niobium carbide coated AISI 1040 steel
Wear, 2008 In the present Study, the wear and friction behavior of AISI 52100 steel and alumina against niobium carbide coated AISI 1040 steel disk was studied using ball-on-disk arrangement. Niobium carbide coating treatment was performed on AISI 1040 steels using
Saduman Sen, Uğur Sen
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Fabrication of niobium carbide coating on niobium by interstitial carburization
International Journal of Refractory Metals and Hard Materials, 2020Abstract Ceramic coatings on niobium substrates are fabricated by hot-pressing the niobium with cast iron at 1100 °C. The interstitial carbon atoms diffuse into the niobium, and NbC and Nb2C precipitate in the surface, forming a ceramic coating. The total volume fraction of the ceramic phases in the coating reaches 92%, and the grain size is in the ...
Ziyuan Zhao +5 more
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Optical and electrical properties of niobium carbide
Physical Review B, 1987The optical and electrical properties were measured for single crystals of ${\mathrm{NbC}}_{\mathrm{x}}$ for x=0.98, 0.87, and 0.76, and for one hot-isostatically-pressed sample of ${\mathrm{NbC}}_{0.88}$. Specular reflectance was measured between 0.025 and 11 eV, and ellipsometry measurements were made at 1.96 eV.
, Allison, , Modine, , French
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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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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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The use of niobium carbide as grain growth inhibitor in WC-10Co cemented carbides
Journal of the European Ceramic Societypeer reviewedA key parameter in the processing of tungsten carbide materials is the control of the grain growth during the sintering stage. To limit the grain coarsening, grain growth inhibitors are added during the mixing of the powders.
Alexandre Mégret +2 more
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THE NIOBIUM—NIOBIUM CARBIDE SYSTEM1
The Journal of Physical Chemistry, 1960The solid pontion of the Nb--NbC phase diagram was determined. The following characteristic temperatures were measured: a eutectic temperature between NbC/sub 0.08/ and NbC/sub 0.39/ of 2335 plus or minus 20 deg C, a peritectic temperature between NbC/sub 0.52/ and NbC/sub 0.56/ of 3090 deg 50 deg C and a melting point maximum at about NbC/sub 0.86/ of
E. K. Storms, N. H. Krikorian
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Hardness anisotropy in niobium carbide
Journal of Materials Science, 1974Measurements of hardness anisotropy by Knoop diamond indentation on the {100} surfaces of Nb6C5 crystals show that the hardness is determined by crystallographic slip on {111} 〈1¯10〉 and {110} 〈1¯10〉 systems. {111} is the preferred slip plane for Nb6C5 and crystals with higher carbon content which show a marked decrease in Knoop hardness.
G. Morgan, M. H. Lewis
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