Tula, Russia
Tula, Russia

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Kasimtsev A.V.,OOO Metsintez | Reutova N.P.,Bardin Central Research Institute for The Iron And Steel Industry | Mnasina L.M.,Dukhov Russian Research Institute of Automation | Zubkov N.P.,Istok Scientific Production Enterprise | And 2 more authors.
Russian Journal of Non-Ferrous Metals | Year: 2011

Calcium-hydride production technology for Zial (Zr-16Al) alloy is developed. In contrast to powder obtained by the grinding of cast alloy, powder produced by calcium-hydride technology is more disperse, with a highly developed particle surface. A method is developed for determining the sorptional capacity of Zial alloy in hydrogen. It is found that Zial powder produced by calcium-hydride technology matches powder obtained from cast alloy in terms of hydrogen sorption and is preferable in terms of carbon-monoxide sorption. X-ray phase analysis shows that gas absorbers made from Zr-16 Al powder produced by the calcium-hydride technology consist mainly of intermetallics Zr3Al2, Zr5Al3, and Zr4Al3. This composition is optimal when using Zial alloy as a getter © 2011 Allerton Press, Inc.


Kasimtsev A.V.,OOO Metsintez | Sviridova T.A.,National Research Technological University iS
Russian Metallurgy (Metally) | Year: 2012

Practically important intermetallics TiNi, NiAl, Ni 3Al, TiAl, and Zr 3Al 2 (St 101 alloy for gas absorbers) produced by the calcium hydride method are comprehensively studied. The total content of impurities in these intermetallic powders does not exceed 1 wt%, and the fraction of the main phase in compounds with a narrow homogeneity region is at least 93-96 vol%. The main phases in all powders under study have a defectless crystal lattice, and their lattice parameters point to a low content of dissolved impurities in all intermetallics except for Zr 3Al 2. A high degree of homogeneity of the phase compositions of the intermetallic powders is supported by a scanning electron microscopy investigation. © 2012 Pleiades Publishing, Ltd.


Kasimtsev A.V.,OOO Metsintez | Yudin S.N.,Tula State University | Sviridova T.A.,National University of Science and Technology "MISIS" | Malyarov A.V.,OOO Metsintez | And 5 more authors.
Russian Journal of Non-Ferrous Metals | Year: 2015

Alloy powder of the Ti–47Al–2Nb–2Cr composition (at %) with a structure of TiAl (60 wt %) and Ti3Al (40 wt %) is prepared by the calcium-hydride method. The mode of calcium-hydride synthesis is optimized for the Ti–50Al (at %) model alloy. It is established that the reduction temperature should be no lower than 1100°C, while the excess of the CaH2 reducing agent should be no lower than 15 wt %. The main physicochemical and manufacturing properties of the synthesized Ti–47Al–2Nb–2Cr powder alloy, which provide the formation of dense compact items during its subsequent consolidation processes, are determined using modern analytical methods. © 2015, Allerton Press, Inc.


Alymov M.I.,RAS Institute of Metallurgy | Shustov V.S.,RAS Institute of Metallurgy | Kasimtsev A.V.,OOO Metsintez | Zhigunov V.V.,Tula State University | And 2 more authors.
Nanotechnologies in Russia | Year: 2011

A technology for the synthesis of titanium carbide nanopowders with a narrow particle-size distribution and a small concentration of impurities has been developed. Conditions for pressing and sintering titanium carbide powders, which served as a basis for the creation of a porous material with an open porosity of up to 50%, have been determined. The ultimate bending strength of the porous material tended to decrease as the sintering temperature increased from 1250 to 1550°C, but it was still in the range of 66 to 95 MPa. © 2011 Pleiades Publishing, Ltd.


Kasimtsev A.V.,OOO Metsintez | Yudin S.N.,Tula State University | Logacheva A.I.,OAO Kompozit | Sviridova T.A.,Moscow Institute of Steel And Alloys
Inorganic Materials | Year: 2015

This paper demonstrates the feasibility of and examines the main steps in preparing the Nb3Al compound by a metallothermic process: by heating a mixture of niobium and aluminum oxides and calcium hydride (calcium hydride reduction process). Our calculations indicate that, when thermodynamic equilibrium sets in during the reaction between the components of a starting mixture, the oxygen content of the intermetallic phase may be very low. We obtained experimental Nb3Al intermetallic powders of nearly 100% purity and investigated their physicochemical and technological properties. © Pleiades Publishing, Ltd., 2015. © A.V. Kasimtsev, S.N. Yudin, A.I. Logacheva, T.A. Sviridova, 2015.


Grigorovich K.V.,RAS Institute of Metallurgy | Alpatov A.V.,RAS Institute of Metallurgy | Rumyantsev B.A.,RAS Institute of Metallurgy | Kasimtsev A.V.,OOO Metsintez | And 3 more authors.
Inorganic Materials | Year: 2015

We have studied the effect of process parameters (temperature) in the reduction of titanium oxide with calcium hydride and calcium carbide on the concentrations and state of light elements (H, O, N, C, and S) in the reaction product and identified the oxygen-containing phases present in the titanium carbide (TiC) nanopowders obtained by reducing TiO2 with calcium hydride and calcium carbide. The oxygen present in the powders can be divided qualitatively and quantitatively into oxygen in adsorbed water, oxygen in organic compounds on the surface, and oxygen in the oxide layer on the surface of the carbide nanoparticle. We have performed fractional gas analysis for carbon in the titanium carbide nanopowders and assessed the effect of synthesis temperature on the average particle size and oxygen content of the nanopowders. © 2015 Pleiades Publishing, Ltd.


Zaitsev A.A.,National University of Science and Technology "MISIS" | Kaplanskii Y.Y.,National University of Science and Technology "MISIS" | Sentyurina Z.A.,National University of Science and Technology "MISIS" | Levashov E.A.,National University of Science and Technology "MISIS" | And 5 more authors.
Russian Journal of Non-Ferrous Metals | Year: 2016

A complex production technology of electrodes from the powder alloy based on titanium aluminide TiAl, which includes the stages of fabrication of the powder alloy by calcium hydride reduction, treatment of the powder in a ball hard alloy mill with the addition of Y2O3 as a structural modifier, and the hydrostatic formation and sintering of a billet, is proposed. Formation and sintering processes are investigated for experimental samples and the alloy microstructure is investigated at all stages of process flowchart. The electrode for the plasma centrifugal spraying of the granules is fabricated using this technology. © 2016, Allerton Press, Inc.


Kasimtsev A.V.,OOO Metsintez | Zhigunov V.V.,Tula State University
Russian Journal of Non-Ferrous Metals | Year: 2010

The mechanism and kinetics for the formation processes of powders of intermetallic compounds when the mixtures of oxides, metals, and calcium hydride are heated in the range t = 900-1200°C (the calcium hydride method) are investigated. It is established experimentally that the compounds are synthesized in two stages. At the first stage, metal oxides are reduced by the calcium melt (starting from ~840°C); at the second stage, diffusion interactions of the components proceed. It is shown that, for the effective development of processes of alloy formation, metal components should be dissolved in liquid calcium or to form the eutectics between one another at a value of t not exceeding the working temperature of the process. As the latter increases, the reduction of oxides and diffusion interaction between the components are intensified and finished at t > 1200°C with the formation of homogeneous powders of intermetallic compounds. The possibility of forming a wide nomenclature of powders for intermetallic compounds of different applications is shown. © 2010 Allerton Press, Inc.


Kasimtsev A.V.,OOO Metsintez | Markova G.V.,Tula State University | Shuitsev A.V.,Tula State University | Levinskii Y.V.,Lomonosov Moscow University of Fine Chemical Technology | And 2 more authors.
Russian Journal of Non-Ferrous Metals | Year: 2016

A complex investigation of physicochemical properties and structural components of the calcium hydride TiNi intermetallic compound is performed. Peculiarities of the influence of various consolidation types (hot isostatic pressing and hydrostatic pressing with subsequent sintering in vacuum) on the chemical and phase compositions of compacts from studied powders are investigated by optical and scanning electron microscopy, X-ray structural analysis, and analysis of gas-forming elements. It is established that vacuum sintering makes it possible to decrease contents of oxygen, nitrogen, and especially hydrogen. © 2016, Allerton Press, Inc.

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