Fabrication of Ni-VC Nano composite powder from oxide reactants by mechanochemical method

Subject Areas :

Seyed Amir Hossein Emami ¹ ( استادیار، مرکزتحقیقات مواد پیشرفته، دانشکده مهندسی مواد، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، اصفهان، ایران )
Seyed Kamal Hosseini ² ( Najafabad Branch, Islamic Azad University )
Danial Davoodi ³ ( Young Researchers and Elite Club, Najafabad Branch, Islamic Azad University )

Received: 2016-08-29 Accepted : 2019-03-04 Published : 2019-02-20

Keywords: Nano Composite, Nickel, vanadium carbide, Mechanochemical, mechanically induced self-sustaining,

Abstract :

This research aims to produce Ni-Vanadium Carbide composite nano powder, known as a hard metal, from oxide raw materials and magnesium as a reductant, using mechano-chemical method. With regard to the adiabatic temperature (T=3964 K), this reaction is a mechanically induced Self-sustaining (MSR) type. Raw materials were mixed according to stoichiometry reaction with a ratio of (1:1:6:2) for Nickel oxide, Vanadium oxide, Magnesium and graphite respectively. Milling was carried out in a planetary ball mill with a powder to ball ratio of 1:20 under argon gas atmosphere. After 40min of milling, combustion occurred out in the mill chamber. With regard to the results of X-ray difraction after the combustion, the intended products; that are, Nickel, Vanadium Carbide and Magnesium Oxide which is by-product of the reaction, were completely produced. HCl with a concentration of 9% was used to remove the magnesium oxide phase. The crystallite size and lattice strain were calculated using Williamson-Hall method, and the crystallite size and lattice strain of Ni and Vanadium Carbide were obtained 40nm, 0.00595, 54nm, 0.00615, respectively.

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