Nanostructured tungsten carbides by thermochemical processing

Synthesis and characterization of nanostructured molybdenum & tungsten carbide materials, and study of diffusion model

“…Other trials of tungsten carbide synthesis produced a form most notably corresponding to WC x . Carbide materials (WC 9 , WC 10 , WC 17 ) prepared with a 1:1 ratio of CH 4 /H 2 yielded different results upon visual inspection of the products. WC 9 powders were comprised of grayish-metallic grains similar to those of Mo 2 C and Mo 2 N. WC10 powders were brown, while WC 11 and WC 17 yielded dark-purple powders.…”

“…Kurishita et al, 15 presented a contemporary status of the development of nanostructured refractory transition metals of W and Mo emphasizing the effects of nano-structures upon the mitigation embrittlement by high ductile-to-brittle transition temperature (low temperature embrittlement) and by irradiation (radiation embrittlement). There are also many other recent investigations that have been carried out on WC synthesis [16][17][18] .…”

Mechanical Desensitization of an Al/WO3 Nanothermite by Means of Carbonaceous Coatings Derived from Carbohydrates

“…The resulting WO 3 /saccharide composites were heat-treated at 500 • C (5 • C/min, 2 h) under an argon flow (100 mL/min) in order to assess the WO 3 /carbon composites. This onset temperature was chosen to be low in order to avoid interfacial reactions between the components leading to the synthesis of the under-oxygenated tungsten oxides (WO 3-x ) or tungsten carbide (W x C) phases [28]. The experimental yields in the solid carbon phase were close to 20 and 24 wt.% for the sucrose and cellulose, respectively.…”

Synthesis of nanocrystalline tungsten and tungsten carbide powders in a single step via thermal plasma technique

“…The developed process requires spray drying the starting powders prior to heat treatment to obtain nano size WC. Some other techniques like ball milling [15,16] and wire explosion [17] were recently explored for synthesis of nano size tungsten carbide powder. However the developed processes are very expensive and have low probability for commercially manufacturing large quantities of nano size tungsten carbide powders with consistent quality.…”