Structure of strengthening particles of niobium carbide in Fe–Cr–Ni cast refractory alloys

Cast refractory alloys Mo–Nb–Si–B were prepared by centrifugal self-propagating high-temperature synthesis (SHS) from metallothermic mixtures containing MoO3, Nb2O5, Al, Si, and B powders, and additive of Al2O3 as a temperature-moderating and chemically inert agent. Variation in the centrifugal acceleration and amount of the additive affected the composition and structure of cast Mo–Nb–Si–B alloys. In a wide range of values, the combustion temperature was found to exceed 3000 K, and the combustion products were obtained as two-layer ingots of target Mo–Nb–Si–B alloy (lower) and Al2O3 slag (upper).

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

High Temperature Material Processes An International Quarterly of High-Technology Plasma Processes ◽

10.1615/hightempmatproc.2019030185 ◽

2019 ◽

Vol 23 (2) ◽

pp. 97-105 ◽

Cited By ~ 1

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

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

Voprosy Materialovedeniya ◽

10.22349/1994-6716-2019-100-4-78-90 ◽

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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Evaluation of Niobium Carbide Coatings Produced Using Fluidized Bed CVD Techniques

10.1063/1.2950230 ◽

1994 ◽

Author(s):

Joseph A. Heaney ◽

Joseph T. Keeley ◽

Albert H. Bremser ◽

Mohamed S. El-Genk ◽

Mark D. Hoover

Keyword(s):

Fluidized Bed ◽

Niobium Carbide ◽

Carbide Coatings

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Elaboration and Characterization of the Properties of Refractory Cr Base Alloys

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.72.46 ◽

2010 ◽

Vol 72 ◽

pp. 46-52 ◽

Cited By ~ 1

Author(s):

Laurent Royer ◽

Stéphane Mathieu ◽

Christophe Liebaut ◽

Pierre Steinmetz

Keyword(s):

Mechanical Properties ◽

Melting Point ◽

Molten Glass ◽

Energy Production ◽

Creep Properties ◽

Refractory Alloys ◽

Industrial Use ◽

Kinetics Of ◽

Selection Of

For energy production and also for the glass industry, finding new refractory alloys which could permit to increase the process temperatures to 1200°C or more is a permanent challenge. Chromium base alloys can be good candidates, considering the melting point of Cr itself, and also its low corrosion rate in molten glass. Two families of alloys have been studied for this purpose, Cr-Mo-W and Cr-Ta-X alloys (X= Mo, Si..). A finer selection of compositions has been done, to optimize their chemical and mechanical properties. Kinetics of HT oxidation by air, of corrosion by molten glass and also creep properties of several alloys have been measured up to 1250°C. The results obtained with the best alloys (Cr-Ta base) give positive indications as regards the possibility of their industrial use.

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