Tungsten halide hydrogen reduction method

The main raw materials for preparing tungsten powder using the tungsten halide hydrogen reduction method are WCl6 and WF6. This method uses tungsten or tungsten waste as raw materials, directly chlorinating or fluorinating the raw materials and then reducing them with hydrogen to obtain ultrafine tungsten powder with a purity greater than 99.9% and a particle size less than 0.1 μm. Zhao Qinsheng et al. obtained ultrafine black tungsten powder using a gas-phase reaction of tungsten hexachloride with hydrogen. The main reaction is as follows:

Compared to the tungsten oxide hydrogen reduction method, this method consumes less hydrogen, has lower costs, and produces tungsten powder with high purity, fine and uniform particles, and good thermal stability. However, the preparation process generates a large amount of harmful gases (HCl or HF), which corrode production equipment and pollute the environment, and is rarely used in actual production.