In Situ Synthesis of Nanostructured WC‐Co Within Silica Gel Matrix

Abstract

In situ reduction of tungstic acid and cobalt chloride by dextrose in silica gel resulted in co‐deposition of tungsten carbide‐cobalt (WC–Co) nanoparticles with different proportions of cobalt (5–15 wt % of WC). X‐ray powder diffraction (XRD), high‐resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM) and Fourier‐transform infrared (FT‐IR) spectroscopy have been used for characterizing these nanoparticles. WC‐Co aggregates of 25–30 nm size have been achieved, successfully.

Obtaining of Composite Alloys Based on Nickel Aluminides with Rare Metals

“…Tungsten carbide (WC) and boride (WB) are widely used as reinforcing phases, since they have many positive properties including high hardness, chemical stability, low thermal expansion, good abrasion and oxidation resistance [13,14]. That is why carbides and borides are widely used for the manufacture of cutting tools, tips for perforators, tools for mining industry [15]. Usually, hardening phases are prepared separately and then are mixed with metal powders such as Co [16], Ni [17] or Fe [18] to obtain composites.…”