Synthesis of the WC and Mo$_2$C Carbides by Mechanical Alloying of Metal Powder and Carbon Nanotubes
Year: 2018
Type: article
Abstract: Nanoscale WC and Mo 2 C carbides are synthesized from the elemental metal powder (with particle size of about 40 m; purity is not less than 99.6% wt.) and the carbon nanotubes (CNTs, with average diameter of 10-20 nm) by mechanical alloying in a high-energy planetary ball mill for the first time.Nature of interaction of the charge components at processing in a ball mill is studied on test samples (selected at each 1-2 hours of synthesis) using a complex of x-ray techniques.These techniques include: a full-profile analysis for the primary processing of diffractograms obtained with DRON-3M apparatus; qualitative and quantitative phase analysis for determining the phase composition of the products of synthesis; x-ray structural analysis to verify and refine the structural models; Williamson-Hall method for determining the grain sizes of synthesized carbides and microdistortions of their crystal lattice.Four hours of charge processing result in a formation of the hightemperature W 2 C and Mo 2 C carbides, the crystal structure of which is related to the -Fe 2 N structure type with vacancies within the metal sublattice.Further milling of W-CNT mixture (up to 10 hours) is accompanied by the W 2 C CNT WC transformation, while processing of the Mo-CNT mixture leads to its dispersion.The effect of CNTs on mechanochemical synthesis of the WC and Mo 2 C carbides is considered.As shown, the mechanical alloying of W/Mo-CNT is a highly effective method for the fabrication of the WC and Mo 2 C carbides.Due to their unique mechanical characteristics (high hardness, wear resistance, and strength), these materials are widely used in mak-
Authors: O. Nakonechna, M. Dashevskyi, N. Belyavina
Institution: Taras Shevchenko National University of Kyiv
Language: English
Subfield: Ceramics and Composites
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2895296497