Verkhnyaya Pyshma, Russia
Verkhnyaya Pyshma, Russia

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Kashcheev I.D.,Ural Federal University | Zemlyanoi K.G.,Ural Federal University | Rylov A.N.,OAO Uralredmet | Raikov A.Y.,OAO Uralredmet | And 3 more authors.
Refractories and Industrial Ceramics | Year: 2015

Compositions and manufacturing technology are developed for manufacturing a crucible lining for master alloy preparation by an aluminothermic method. Slag is the main material used for lining manufacture, formed during reduction of aluminum metal oxides containing 80 – 84% α-Al2O3. Charge compositions are developed within which soda and high-alumina cement are tested as binder. The technology is introduced into OAO Uralredmet. © 2015 Springer Science+Business Media New York


Larionov A.V.,RAS Institute of Metallurgy | Chumarev V.M.,RAS Institute of Metallurgy | Udoeva L.Y.,RAS Institute of Metallurgy | Mansurova A.N.,RAS Institute of Metallurgy | And 4 more authors.
Russian Metallurgy (Metally) | Year: 2013

Aluminothermic smelting of Al-Zr and Al-Zr-Mo-Sn alloys has been simulated in terms of thermodynamics. The thermodynamic properties of molybdenum and zirconium intermetallic compounds are calculated. It is demonstrated that, with consideration for their formation, the calculated compositions of aluminothermic blends and the forecasted extraction of target metals into an alloy are in good agreement with the data obtained during pilot tests. © 2013 Pleiades Publishing, Ltd.


Rylov A.N.,OAO Uralredmet | Raikov A.Y.,OAO Uralredmet | Martynov A.V.,OAO Uralredmet | Chumarev V.M.,RAS Institute of Metallurgy | And 2 more authors.
Russian Metallurgy (Metally) | Year: 2013

The possibility to use aluminum nitride as a nitriding agent for out-of-furnace aluminothermic melting of V-Al-N master alloys is studied and tested. It has been found that the replacement of nitrided vanadium by aluminum nitride in a charge for melting does not change the phase composition of the master alloy and the uniformity of the distribution of nitride inclusions in the ingot volume. The nitrogen-containing phase of the V-Al-N master alloy is represented by aluminum nitride. The mean values of the structural parameters of the master alloys melted from charges containing nitrided vanadium or aluminum nitride are identical. © 2013 Pleiades Publishing, Ltd.


Sel'menskikh N.I.,RAS Institute of Metallurgy | Chumarev V.M.,RAS Institute of Metallurgy | Zhidovinova S.V.,RAS Institute of Metallurgy | Pankratov A.A.,RAS Institute of Metallurgy | And 2 more authors.
Russian Journal of Non-Ferrous Metals | Year: 2014

The phase composition, microstructure, and crystal structure of the AMT TU-48-4-366 (Technical Specifications) foundry alloy (which is used as the alloying material when smelting titanium alloys) are investigated by X-ray phase analysis, electron probe microanalysis, and microscopy. Lattice parameters of e{open}, p, and δ phases are calculated and their elemental composition is revealed. No formation of the Mo3Al refractory phase (t m = 2150°C) is observed during the primary crystallization of the Al-Mo-Ti foundry alloy in nonequilibrium conditions. Its presence in the refractory phase in the foundry alloy is caused by secondary crystallization processes, during which an ultradispersed mixture of Mo3Al + Mo3Al8 + TiMoAl6 phases is formed at temperatures 1311 and 1314°C. The ultradispersed silicon-containing σ phase with the Mo2.4Ti2.1Si0.8Al4.7 average composition, which was formed in nonequilibrium crystallization conditions, is revealed. Parameters and interplanar distances of its lattice are determined. It is established that the largest nonuniformity by molybdenum in peritectics of primary crystals occurs at a high crystallization rate, i.e., in the lower part of the Al-Mo-Ti ingot. © 2014 Allerton Press, Inc.


Chumarev V.M.,RAS Institute of Metallurgy | Mar'evich V.P.,RAS Institute of Metallurgy | Larionov A.V.,RAS Institute of Metallurgy | Dubrovskii A.Y.,OAO Uralredmet
Inorganic Materials | Year: 2011

Reactions of vanadium, niobium, and tantalum pentoxides with aluminum nitride have been studied using X-ray diffraction. At temperatures from 1000 to 1600°C, we have identified various V, Nb, and Ta nitrides. The composition of the niobium and tantalum nitrides depends on the reaction temperature. The tendency toward nitride formation becomes stronger in the order V 2O 5 > Ta 2O 5 < Nb 2O 5. © 2011 Pleiades Publishing, Ltd.


Pan'kov I.A.,OAO Uralredmet | Chumarev V.M.,RAS Institute of Metallurgy | Mar'evich V.P.,RAS Institute of Metallurgy | Sel'menskikh N.I.,RAS Institute of Metallurgy | And 2 more authors.
Russian Metallurgy (Metally) | Year: 2010

Some causes of the formation of refractory phases during making of an Al-Nb-Si master alloy are considered. Chemical analysis, X-ray diffraction, and electron-probe microanalysis of master alloy ingots melted by aluminothermic and aluminocalciumthermic methods demonstrate that partial (up to 5%) substitution of calcium for aluminum in a charge does not degrade the quality of the master alloy. It is experimentally shown that the interaction of NbAl3 and Nb2Al with niobium pentoxide leads to the formation of elemental niobium. The presence of materials containing niobium aluminides in a charge can affect the perfection of the master alloy. © 2010 Pleiades Publishing, Ltd.


Chumarev V.M.,RAS Institute of Metallurgy | Larionov A.V.,RAS Institute of Metallurgy | Sel'menskikh N.I.,RAS Institute of Metallurgy | Pankratov A.A.,RAS Institute of Metallurgy | And 3 more authors.
Russian Metallurgy (Metally) | Year: 2012

The structure and phase composition of the V-Al-N master alloys produced using out-of-furnace aluminothermic melting of charges containing nitrided vanadium filings or powdered electrolytic vanadium are studied. It has been found that the nitrogen-containing phase of these alloys is represented by aluminum nitride. The master alloy ingots melted using the nitriding agents are characterized by identical values of the integral parameters of nitride phases. Based on metallography results, certain similarity is found between inclusions and the nitriding agent added to the charge for melting of a V-Al-N master alloy. © 2012 Pleiades Publishing, Ltd.

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