Combustion Synthesis and Consolidation of Ni-W Nanocomposite Material


 
Marieta Zakaryana,b, Sofiya Aydinyanc, Suren Kharatyana,b
aA.B. Nalbandyan Institute of Chemical Physics NAS RA, Yerevan, Armenia
bYerevan State University, Yerevan, Armenia
cTallinn University of Technology, Tallinn, Estonia
(8 pages)

https://doi.org/10.29272/cmt.2018.0007

Abstract

Ni-W nanocomposite material was synthesized by self propagating high temperature synthesis method from the NiO-WO3 oxides mixture using Mg+C combined reducers via thermo-kinetic coupling approach. Thermodynamic modeling was performed to design combustion synthesis in the NiO-WO3-yMg-xC system to find out optimum values for x and y in a moderate temperature conditions. Combustion peculiarities and reduction mechanism were explored using copper wedge technique combined with XRD analysis of the quenched products disclosing the preferential participation of magnesium rather than carbon in the primary stage of reduction process. The obtained Ni-W nanocomposite material with up to 50 nm average particle size subjected to spark plasma sintering exhibited high relative density and improved microhardness.
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