Preparation of alumina–tungsten carbide nanocomposite by mechano-chemical reduction of WO3 with aluminum and graphite

Effect of heat absorbing alumina addition on mechanochemical synthesis of WC–Al2O3nanocomposites

“…The simplicity and low cost of this process together with its ability of producing several types of nanomaterials, including carbides, nitrides and silicides, as well as various composites, have attracted much attention worldwide. [12][13][14][15][16][17] Mechanochemical synthesis of WC-Al 2 O 3 composite powder from WO 3 -Al-C mixtures has been reported by El-Eskandarany, 18 Pallone et al 19 and Zakeri et al 20 The authors of the present paper have also conducted a series of research works in this field. [21][22][23][24] It has been shown that after an initial crystallite refinement, the synthesis process is initiated by the vigorous exothermic reduction of WO 3 by Al, and tungsten carbides, WC and/or W 2 C, are formed by the reaction of reduced tungsten with carbon.…”

Influence of the filling ratio of vial in chemical surface and physicochemical properties of ZnO nanoparticles obtained by planetary ball milling process

“…These last two parameters must be selected appropriately to obtain the highest possible efficiency of the process. The researchers thought that the BPR was the key variable par excellence because a higher grinding bodies/powder ratio would mean an increase in the number of collisions during grinding, therefore a better efficiency, 17–20 especially for mechanochemical synthesis. However, some works show that the BPR influence is not so decisive in the grinding performance 13,16 …”

Mechanochemical synthesis of tungsten carbide nano particles by using WO3/Zn/C powder mixture

“…Active metals such as Mg [12] and Al [13] have been used for mechanochemical synthesis of WC. Also WC/Al 2 O 3 nano composite can be produced by milling the mixture of WO 3 /Al/C for 100 h [13], or by annealing 5 h milled powders at different high temperatures [17]. W 2 C is known as an undesired phase in these systems, because it has inferior properties to WC.…”