Cover Page January-2018-Advanced Materials Letters

Advanced Materials Letters

Volume 9, Issue 1, Pages 86-90, January 2018
About Cover

Cover page describe the Schematic diagram of surface faradaic redox reactions on the Fe2O3 nanoparticles on Nitrogen-doped graphene. The Figure has been taken from the manuscript entitled “Graphene-metal oxide nanocomposites for supercapacitors: A perspective review”.


Thermal plasma spheroidization of Nb-16Si powder alloy obtained by mechanical alloying

Nikolay G. Razumov1*, Anatoly A. Popovich1, Andrey V. Samokhin2, Aleksei V. Grigoriev1, 3 

1Peter the Great Saint-Petersburg Polytechnic University, 195251, Polytechnicheskaya, 29, St. Petersburg, Russia

2Institute of Metallurgy and Materials A.A. Baikova, Russian Academy of Sciences, 119991, Leninsky pr., 49, Moscow, Russia

3JSC, Klimov, 194100, Kantemirovskaya St., 11, St. Petersburg, Russia

Adv. Mater. Lett., 2018, 9 (1), pp 86-90

DOI: 10.5185/amlett.2018.7073

Publication Date (Web): May 15, 2018

E-mail: n.razumov@inbox.ru

Abstract

Spherical Nb-Si powder alloy is a perspective material to manufacture products for the aerospace industry by additive technologies. Nb-16Si (at.%) powder alloy was prepared by mechanical alloying from pure elemental powders using planetary ball mill Fritsch Pulverisette 4. Spheroidization was carried out on plasma generator based on thermal plasma arc generator with vortex discharge stabilization. Experimental results show that plasma spheroidizing of Nb-16Si powders obtained by mechanical alloying is possible. It is shown that after the spheroidization the particle surface is rough which indicates the cast structure of the material. Three phases having different optical contrast are revealed on microsections: Nb5Si3, Nb3Si and Nbss, which is confirmed by X-ray diffraction. It is shown that the main peaks in the X-ray graph after MA correspond to a solid solution of niobium with a cubic lattice and the parameter a = 0.333 nm, as well as niobium silicide Nb5Si3 with a hexagonal lattice (P63/m) a = 0.7536 nm and c = 0.5249 nm. After spheroidization the hexagonal lattice of niobium silicide Nb5Si3 is transformed into a tetragonal lattice (I4/m) with the parameter = 0.6557 nm and c = 1.186 nm. The other phase components remain unchanged.

Keywords

Mechanical alloying, in-sute composites, Nb-Si, powder spheroidization, thermal plasma, spherical powder.

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