Ultrafine Tungsten Carbide Preparation by Low Temperature Combustion Synthesis

Tungsten carbide is a kind of non-noble metal catalyst with excellent stability and oxidation resistance, and has strong anti-carbon monoxide, hydrocarbons, hydrogen sulfide poisoning characteristics. It is a kind of catalytic material with great research value and development prospects.

So far, a lot of research work has been done on the preparation methods, catalytic properties, physicochemical properties and surface structure of WC catalysts. Traditional powder metallurgy process for preparing tungsten carbide needs to be carried out at high temperature, which consumes a lot of energy and has different advantages and disadvantages.

The low-temperature combustion synthesis method dissolves the reductants (organic fuels) and oxidants (metal salts) in water with a certain stoichiometric ratio to make the reactants mix at the molecular level. During the heating process of the solution, with the continuous evaporation of water, the solution boils, concentrates and smokes. When the temperature of the reaction system reaches the ignition temperature, it automatically ignites. In the combustion reaction process, a large amount of gas and heat released from the product can be fully dispersed and sintered at the atomic scale, and nano-powders with uniform composition and fine grain size can be obtained. This synthesis process is simple, fast and simple, and can overcome the shortcomings of other processes such as harsh conditions, low output and difficult to industrialize. Some researchers believe that it can also be used in the preparation of nano-tungsten carbide.

The synthesis of tungsten carbide by low-temperature combustion synthesis method, because of the exothermic nature of the oxidant and fuel mixture used, spontaneously undergoes redox reaction induced by lower temperature, so that the tungsten source and the carbon source are evenly distributed and the contact is sufficient. Micron-sized tungsten carbide powder is obtained at a low temperature; and the raw material cost is low, the preparation operation is simple, and the potential for large-scale popularization and application is obtained.

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