Properties of zirconium carbide -niobium carbide alloys in their homogeneity region

1971 ◽  
Vol 10 (2) ◽  
pp. 151-153
Author(s):  
G. V. Samsonov ◽  
G. Sh. Upadkhaya
Keyword(s):  
Niobium Carbide ◽  
Zirconium Carbide ◽  
Homogeneity Region

Characterization of Metal-Like Carbides-Graphene Composite Prepared by SPS Method

2015 ◽  
Vol 655 ◽  
pp. 87-91 ◽  
Author(s):  
Piotr Wyzga ◽  
Lucyna Jaworska ◽  
Piotr Putyra ◽  
Marcin Podsiadlo ◽  
Jolanta Cyboron
Keyword(s):  
Niobium Carbide ◽  
Zirconium Carbide ◽  
High Hardness ◽  
Carbide Powder ◽  
Self Diffusion ◽  
Graphene Composite ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
20 Nm

High hardness, good thermal and electrical conductivity make carbides technologically important materials. The high melting temperature and low coefficients of self-diffusion make it difficult to obtain full dense material. In this paper the results of Spark Plasma Sintering (SPS) of transition metal carbides: NbC, TaC, TiC, ZrC, VC with the addition of graphene 10-20 nm x 14 microns in an amount of 2.5 mass % are presented. Powders were mixed in isopropyl alcohol in a planetary ball mill for 1h. The sintering processes was carried out at 2200°C at two different times: 5 and 30 min. Microstructure of the samples was analyzed using scanning electron microscopy. The measurements of density, Young's modulus hardness and electrical properties were carried out, also. The best properties were obtained for titanium carbide powder, sintered for 30 min. The most significant density increase of the sintered carbide–graphene composite by about 5.3% (depending on increasing sintering duration) was obtained for niobium carbide, while the smallest densities change for zirconium carbide.

Gas evolution from zirconium carbide, niobium carbide, and tantalum carbide powders

1986 ◽  
Vol 25 (5) ◽  
pp. 363-366
Author(s):  
A. V. Makeev ◽  
V. V. Khromonozhkin ◽  
A. S. Maskaev ◽  
V. G. Vil'chinskii
Keyword(s):  
Niobium Carbide ◽  
Zirconium Carbide ◽  
Tantalum Carbide ◽  
Gas Evolution

Slip system determination in cubic carbides by hardness anisotropy

1972 ◽  
Vol 326 (1566) ◽  
pp. 409-420 ◽  
Keyword(s):  
Slip System ◽  
Temperature Regime ◽  
Niobium Carbide ◽  
High Mobility ◽  
Zirconium Carbide ◽  
Metal Carbides ◽  
Temperature Dependent ◽  
Covalent Bonds ◽  
Temperature Regimes ◽  
Dependent Change

Hardness has been examined as a function of indenter orientation on the (001) surfaces of the cubic transition-metal carbides titanium carbide, vanadium carbide, zirconium carbide and niobium carbide. To emphasize the observed anisotropy a Knoop indenter was used. Experiments have been performed in the temperature range —196 to 610 °C. The anisotropy curves obtained at each temperature have been analysed in terms of operative slip systems. Three different temperature regimes for the anisotropy have been identified. These correspond to the {110} <110> slip system for the low-temperature regime, the {111} <110> slip system for the high-temperature regime and a combination of these two systems for the intermediatetemperature regime. To explain this change in slip system it is proposed that an important temperature dependent change in bonding occurs. A qualitative model is suggested for this change in which an increased density of high mobility electrons increasingly screens the directional covalent bonds as the temperature is raised.

FORMATION OF HARD AND WEAR-RESISTANT NIOBIUM CARBIDE COATINGS ON HARD-ALLOY TOOLS BY A VACUUM–ARC METHOD

2019 ◽  
Vol 23 (2) ◽  
pp. 97-105 ◽  
Author(s):  
Andrej K. Kuleshov ◽  
Vladimir V. Uglov ◽  
V. M. Anishchik ◽  
V. A. Firago ◽  
D. P. Rusalski ◽  
...  
Keyword(s):  
Hard Alloy ◽  
Niobium Carbide ◽  
Vacuum Arc ◽  
Wear Resistant ◽  
Carbide Coatings

Stoichiometric composition of thin-film surface structures and its influence on the functional characteristics as regards gyroscopic devices

2020 ◽  
pp. 78-90
Author(s):  
M. A. Tit ◽  
S. N. Belyaev
Keyword(s):  
Thin Film ◽  
Titanium Nitride ◽  
Niobium Carbide ◽  
Structural Phase ◽  
Stoichiometric Composition ◽  
Film Surface ◽  
Surface Structures ◽  
Functional Surface ◽  
Base Surface ◽  
Thin Film Surface

This article considers the research results of the effect of stoichiometry on the properties of titanium nitride thin-film coatings of the float and electrostatic gyroscopes. It presents the results of tests of such mechanical and optical characteristics of titanium nitride thin-film structures as microhardness, resistance to wear and friction, and image contrast determined by the reflection coefficients of a titanium nitride base surface and a raster pattern formed by local laser oxidation. When making a rotor of a cryogenic gyroscope, the prospects of use and technological methods for the formation of functional surface structures of niobium carbide and nitride are considered. It is shown that during the formation of coatings of the required composition, the most important is the thermodynamic estimation of possible interactions. These interactions allow us to accomplish the structural-phase modification of the material, which is determined by the complex of possible topochemical reactions leading to the formation of compounds, including non-stoichiometric composition.

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