Obtaining of complex-alloyed nickel aluminides and complex ligatures by metal oxides’ metallothermy

Gostishchev, V. V.; Khimukhin, S. N.; Kim, E. D.; Ri, E. H.

doi:10.17580/tsm.2017.10.10

Cited by 6 publications

(4 citation statements)

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“…Thermodynamic evaluation of the process shows that the aluminothermic zirconium oxide reduction reaction is slightly exothermic and the conditions of the out-of-furnace reduction do not provide the completeness of the process; on the contrary, the reduction reaction of tungsten oxide is highly exothermic. Its adiabatic temperature exceeds 3000 ºС and it dominates in general metalthermal system [19][20]. However, in joint reduction process of zirconium and tungsten oxides the leveling effect of the weakly exothermic reaction results in the fact that the developing temperature is not sufficient for separating the metallic phases.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Aluminum-Matrix Alloys with Al-Zr-W by Metallothermy of Oxides

Gostishchev

Kim

2018

SSP

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The article presents the results of obtaining complex-alloyed aluminum-zirconium alloys by aluminothermy of initial metal oxides. Aluminum-matrix Al-Zr-W alloys have been obtained by a metal-thermal reduction with an excessive amount of aluminum in the initial charge of zirconium and tungsten oxides. The process of synthesis is presented as partial reduction reactions of zirconium, tungsten and synthesis of intermetallic compounds. It is shown that thermodynamic parameters of the reactions are favorable for the process of formation of refractory metal alloys. It is found that the temperature reached during the melting process makes it possible to obtain intermetallids and to synthesize alloys at the out-of-furnace process in the form of a compact ingot. The composition of the alloys obtained has been determined by an X-ray phase and an element analysis. It is established that the alloys have a composite structure: intermetallides Al3Zr and Al4W are distributed in the aluminum matrix.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Aluminum-Matrix Alloys with Al-Zr-W by Metallothermy of Oxides

Gostishchev

Kim

2018

SSP

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“…The use of this technology to solve the set tasks is of interest both from the side of science and from the side of production. Today, this technology is already used for a wide range of various high-temperature composite alloys containing even rare earth elements [21]. The method is conventionally divided into several types: according to the materials of the charge (metals or oxides), the type of reducing agents (aluminum, magnesium, calcium, silicon), according to the state of the product after synthesis (solid or liquid) [22].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Composite Alloy Based on Ore Concentrate and Oxide Compounds

Kim

Ermakov

et al. 2021

MSF

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The conditions for the synthesis of Al-Cr-W alloys during the aluminothermic reduction of a mineral tungsten concentrate - scheelite were considered. The alloys were identified as an aluminum matrix by the methods of elemental and X-ray phase analyzes. It is shown that the alloy synthesized from scheelite concentrate contains small amounts of iron and oxygen impurities (1.2 wt. %). It has been established that the alloys have a composite structure: inclusions of continuously solid solutions based on chromium and tungsten, as well as chromium aluminides Al3(Cr, W, Fe)2, which have increased microhardness values (12.9 GPa) are distributed in the aluminum matrix.

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“…Currently, one of the most effective alloying elements is scandium due to the formation of an anomalously supersaturated solid solution during crystallization and its subsequent disintegration with the precipitation of dispersed secondary intermetallides Al 3 Sc [8]. Also discussed the creation and development of new master alloy types -complex master alloys containing nickel and rare-earth metals (REM) [9]. Intermetallic compounds such as nickel and REM (Ce, La) aluminides are proposed to be used as master alloys components for increasing the physical, mechanical and operational properties (heat resistance, corrosion resistance, high temperature oxidation resistance, wear resistance) of cast Al-Cu alloys.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Ri¹,

Ri²,

Деев³

et al. 2020

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The effect of the complex ligature with nickel and REM (Ce, La) aluminides on the structure formation, the nature of the distribution of the elements, and the microhardness of the structural constituents of Al-5 wt.% Cu aluminum alloy were investigated. On the example of microalloying of the Al-5 wt.% Cu alloy with a master alloy containing Ni and REM (Ce, La) aluminides it was shown that a redistribution of Al and Cu occurs in α-solid solution and eutectic. This is reflected in the refinement of α-solid solution and eutectic at 0.15 wt.% of the master alloy addition and, accordingly, increases the microhardness of α-solid solution by 100 MPa and eutectic by 125 MPa.

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Obtaining of complex-alloyed nickel aluminides and complex ligatures by metal oxides’ metallothermy

Cited by 6 publications

References 0 publications

Synthesis of Aluminum-Matrix Alloys with Al-Zr-W by Metallothermy of Oxides

Synthesis of Aluminum-Matrix Alloys with Al-Zr-W by Metallothermy of Oxides

Synthesis of a Composite Alloy Based on Ore Concentrate and Oxide Compounds

Archives of Metallurgy and Materials

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