Mechanoactivated SHS in Ferrotitanium–Carbon Black Powder Mixtures

Прибытков, Г. А.; Baranovskiy, A. V.; Коржова, В. В.; Krinitcyn, M. G.

doi:10.3103/s1061386220010082

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…Here, we report on the design of the SHS route for producing precursors of a controllable microstructure, composition and high purity that are suitable for SPS, HEC or SLM/SLS, which may expand the possibility of SHS to synthesize materials in a controlled temperature regime. From this prospective, the approaches of reactions’ coupling, thermal dilution and mechanical activation become promising [ 14 , 15 , 16 ]. The reactions’ coupling fuels opportunities for the creation of new energy-efficient processes and broadens the scope of materials that can be synthesized by SHS via the matching of the thermal and kinetic requirements of two interconnected reactions [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

SHS-Derived Powders by Reactions’ Coupling as Primary Products for Subsequent Consolidation

2021

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The capability of self-propagating high-temperature synthesis (SHS) to produce powders that are characterized by a high sintering ability, owing to high heating and cooling rates inherent to the exothermic reaction, is of a special interest for the industry. In particular, SHS-derived powders comprise a significant defect concentration in order to effectively enhance the mass transfer processes during the sintering, which allows for the successful consolidation of difficult-to-sinter materials at relatively low sintering temperatures. From this perspective, the design of precursors suitable for sintering, synthesis in a controlled temperature regime and the optimization of geometrical and structural parameters of SHS powders as a potential feedstock for the consolidation is of key importance. Here, we report on the comparative studies concerning the SHS processing of composites for advanced powder metallurgy techniques. The synthesis and sintering peculiarities of the SHS through coupled reactions in the Me’O3(WO3,MoO3)-Me’’O(CuO,NiO)-Mg-C, Ti-B-Al12Mg17 systems are comparatively reviewed. The SHS coupling approach was used for the preparation of powders with a tuned degree of fineness (a high specific surface area of particles), a high-homogeneity and a controllable distribution of elements via both the regulation of the thermal regime of combustion in a wide range and the matching of the thermal and kinetic requirements of two interconnected reactions. Microstructural features of the powder feedstock greatly contributed to the subsequent consolidation process.

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Section: Introductionmentioning

confidence: 99%

SHS-Derived Powders by Reactions’ Coupling as Primary Products for Subsequent Consolidation

2021

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“…One of the promising methods for producing composite alloys is self-propagating hightemperature synthesis (SHS) [11][12][13][14][15][16][17][18][19][20]. 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.…”

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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“…Целью работы было выяснить возможность получения композитов TiC-Cu восстановлением меди из двойных интерметаллидов титан -медь по реакции Ti m Cu n + С → TiC +Cu. Ранее [20] мы показали, что такая реакция восстановления железа идет в механоактивированных порошковых смесях с углеродом (сажей) ферротитана марки ФТи35С5, который на 65 % состоит из титанида железа Fe 2 Ti. Продукты синтеза в режиме теплового взрыва или послойного горения состоят из карбида титана и феррита, легированного кремнием и алюминием.…”

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Study of synthesis products in mechanically activated mixtures of copper titanides with carbon

Pribytkov,

Baranovskiy,

Korzhova

et al. 2024

CPM

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Metal matrix composites reinforced with dispersed carbide particles have an optimal combination of strength and wear resistance. The composites are used as structural materials, wear-resistant materials and coatings as well as functional materials. Copper matrix composites for electrical purposes are strengthened with particles of refractory compounds (carbides, borides, silicides). They are used to manufacture breaking electrical contacts which have increased resistance to erosion under the electric arc exposure. The highest arc erosion resistance is achieved by composites with a structure, in which submicron particles of refractory compounds are homogeneously distributed in the copper matrix. Powder technologies are used to obtain the copper matrix composites. A large number of publications concerns with the production of copper matrix composites strengthened by dispersed particles of titanium diboride. The composite powder was obtained by self-propagating high- temperature synthesis (SHS) occurring through mechanically activated mixtures of titanium, copper and carbon. The synthesis products were compacted by spark plasma sintering (SPS). In the present work, the microstructure, elemental and phase composition of the products of the synthesis reaction occurring through mechanically activated reactant powder mixtures of copper titanides with carbon (soot) subjected to additional heat treatment were studied using the methods of X-ray diffraction, optical and scanning electron microscopy. Copper matrix composites strengthened by carbide particles were obtained by copper reduction from intermetallic compounds (copper titanides) via reaction: TimCun+ C → TiC + Cu. The use of the copper titanides instead of titanium and copper powders eliminates the blocking of surface titanium-carbon reaction by copper during the mechanical activation of titanium-copper-carbon powder mixtures. This ensures a more complete conversion of titanium carbide in the synthesis reaction. It is established that the dispersion of the carbide phase in the structure of the synthesized ‘titanium carbide-copper binder’ composite depends on the elemental ratio of titanium and copper in the reaction mixtures. With an equiatomic content of titanium and copper the synthesis results in a matrix-type composite, in the structure of which submicron (less than 300 nm) carbide inclusions are homogeneously distributed throughout the copper binder. Unreacted copper and titanium in the titanide powders do not prevent the attainment of target phase composition of the synthesis products that include only titanium carbide and copper.

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Mechanoactivated SHS in Ferrotitanium–Carbon Black Powder Mixtures

Cited by 4 publications

References 2 publications

SHS-Derived Powders by Reactions’ Coupling as Primary Products for Subsequent Consolidation

SHS-Derived Powders by Reactions’ Coupling as Primary Products for Subsequent Consolidation

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

Study of synthesis products in mechanically activated mixtures of copper titanides with carbon

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