Combustion synthesis of W-Cu composite powders from oxide precursors with various proportions of metals

Zakaryan, Marieta K.; Kirakosyan, H.; Aydinyan, Sofiya; Kharatyan, S. L.

doi:10.1016/j.ijrmhm.2016.12.003

Cited by 15 publications

(12 citation statements)

References 22 publications

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“…The simultaneous reduction of copper and tungsten in the W-rich system (2) was achieved in the temperature range between 1000 to 2100 °C at certain amounts of carbon and magnesium (x = 2.7-4.2 moles & y = 2.7-4 moles, respectively). Furthermore, for the Cu-rich system (3), at the temperature interval 1050-1900 °C, the values for x parameter from 2.6 to 3.8 moles and for y from 1.8 to 2.8 moles were selected as optimum from the thermodynamic perspective to achieve combined and full reduction of metals [24]. Calculations for the copper-rich WO 3 -13.5CuO-yMg-xC system have shown that within the considered intervals of y and x, multiphase products of various compositions may be formed always in the presence of tungsten carbides as by products.…”

Section: Resultsmentioning

confidence: 99%

“…Temperature-time histories of the combustion process were recorded by thermocouple technique. The preparation of samples for the typical combustion experiment and registration of combustion parameters is thoroughly described in [24].…”

Section: Methodsmentioning

confidence: 99%

“…The combustion experiments performed at pressure P = 0.3 MPa to avoid the formation of gaseous tungsten oxides, Mg and Cu. Based on thermodynamic calculations the combined magnesio-carbothermal reduction of CuO and WO 3 was investigated experimentally for the [24]. Series of combustion experiments aimed at exploring the qualitative and quantitative role of carbon on the combustion peculiarities and phase formation features of the products in all systems under study were performed.…”

Section: Combustion Synthesis and Characterization Of W-cu Powdersmentioning

confidence: 99%

“…In our previous works, a novel strategy based on self-propagating high-temperature synthesis (SHS) or combustion synthesis (CS) method for the preparation of fine Mo-Cu and W-Cu composite powders was reported. It involves the joint reduction of CuO and WO 3 (MoO 3 ) oxides by using combined Mg+C reducer [21][22][23][24]. The use of such type reducer considers regulating the reaction temperature within a broad range and implementing the synthesis in controllable conditions.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Cu-W Nanocomposites by Integration of Self-Propagating High-Temperature Synthesis and Hot Explosive Consolidation Technologies

Aydinyan

Kirakosyan

Zakaryan

et al. 2018

Eurasian Chem. Tech. J.

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Manufacturing W-Cu composite nanopowders was performed via joint reduction of CuO and WO3 oxides with various ratios (W:Cu = 2:1, 1:1, 1:3, 1:13.5) using combined Mg–C reducer. Combustion synthesis was used to synthesize homogeneous composite powders of W-Cu and hot explosive consolidation (HEC) technique was utilized to fabricate dense compacts from ultrafine structured W-Cu powders. Compact samples obtained from nanometer sized SHS powders demonstrated weak relation between the susceptibility and the applied magnetic field in comparison with the W and Cu containing micrometer grain size of metals. The density, microstructural uniformity and mechanical properties of SHS&HEC prepared samples were also evaluated. Internal friction (Q-1) and Young modulus (E) of fabricated composites studied for all samples indicated that the temperature 1000 °С is optimal for full annealing of microscopic defects of structure and internal stresses. Improved characteristics for Young modulus and internal friction were obtained for the W:Cu = 1:13.5 composite. According to microhardness measurement results, W-Cu nanopowders obtained by SHS method and compacted by HEC technology were characterized by enhanced (up to 85%) microhardness.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Combustion Synthesis and Characterization Of W-cu Powdersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication of Cu-W Nanocomposites by Integration of Self-Propagating High-Temperature Synthesis and Hot Explosive Consolidation Technologies

Aydinyan

Kirakosyan

Zakaryan

et al. 2018

Eurasian Chem. Tech. J.

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“…The study of characterization of microstructural evolution was rendered a composite of tungsten with lignin kraft [1]. Tungsten metal is used in several applications; in the nuclear sector presents good mechanical resistance and an excellent cross section with thermal neutrons [2].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the microstructural evolution of composite of Tungsten with lignin kraft

Souza¹,

Rossi²,

Fernandes³

et al. 2017

Blucher Physics Proceedings

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In materials science and engineering, there is a demand in new materials for radiation shielding in the transport of radiopharmaceuticals used in the diagnosis and therapy of cancer, justifying the interest in developing this work. The obtained lignin kraft and tungsten form the precursors used for metal-organic composite. Tungsten metal has diverse applications in the nuclear sector presents an enormous mechanical strength and an excellent cross section with thermal neutrons. The aim of this study is to analyse the microstructural evolution of metal-organic composite using the kraft lignin and tungsten, using analysis of scanning electron microscopy (SEM), microhardness test and x-ray diffraction (XRD). Microscopic analysis showed the granulometry of the precursors separate and composite morphology, observing the formation of alpha (α) and beta (β) phases and absence of oxidation process for different heat treatment temperatures. The spectra of x-ray diffraction identified the structures of each phase formed and micro hardness measures showed an increase of mechanical resistance with temperature. The results of the microstructural characterization of metal-organic composite, will contribute in the next steps of attenuation measurements of gamma radiation.Keywords: Tungsten; Composite; Lignin Kraft. ResumoNa ciência dos materiais e na engenharia, há uma demanda em novos materiais para proteção contra radiação no transporte de radiofármacos utilizados no diagnóstico e terapia do câncer, justificando o interesse em desenvolver este trabalho. A lignina kraft obtida e o tungstênio formam os precursores utilizados para o composto metal-orgânico. O metal de tungstênio tem diversas aplicações no setor nuclear, apresenta uma enorme resistência mecânica e uma excelente seção transversal com neutrons térmicos. O objetivo deste estudo é analisar a evolução microestrutural do composto metal-orgânico utilizando a lignina kraft e tungstênio, utilizando análise de microscopia eletrônica de varredura (SEM), teste de micro dureza e difração de raios X (XRD). A análise microscópica mostrou a granulometria dos precursores separada e morfologia compósita, observando a formação de fases alfa (α) e beta (β) e ausência de processo de oxidação para diferentes temperaturas de tratamento térmico. Os espectros de difração de raios X identificaram as estruturas de cada fase formada e as medidas de micro dureza mostraram um aumento da resistência mecânica com a temperatura. Os resultados da caracterização microestrutural de compostos metálicos e orgânicos contribuirão nos próximos passos das medidas de atenuação da radiação gama.

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Reduction mechanism of WO3 + CuO mixture by combined Mg/C reducer

Aydinyan

Nazaretyan

Zargaryan

et al. 2018

J Therm Anal Calorim

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Combustion synthesis of W-Cu composite powders from oxide precursors with various proportions of metals

Cited by 15 publications

References 22 publications

Fabrication of Cu-W Nanocomposites by Integration of Self-Propagating High-Temperature Synthesis and Hot Explosive Consolidation Technologies

Fabrication of Cu-W Nanocomposites by Integration of Self-Propagating High-Temperature Synthesis and Hot Explosive Consolidation Technologies

Analysis of the microstructural evolution of composite of Tungsten with lignin kraft

Reduction mechanism of WO3 + CuO mixture by combined Mg/C reducer

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