Tungsten hexachloride can be applied for preparing porous WO3 film. Wherein, porous WO3 film is a common gas-sensitive material with excellent gas-sensing performance and gasochromic performance. In addition, it is a typical electrochromic material, and is considered to be one of the most promising electrochromic materials. Tungsten hexachloride (WCl6) is a raw material for preparation of new material that can be used in the chemical industry for catalytic applications, as well as in the glass industry, mainly for the production of surface coatings. So, what is the connection between the porous WO3 film and tungsten hexachloride?

Ammonium paratungstate (APT) is a white crystalline salt with the chemical formula (NH₄)₁₀(H₂W₁₂O₄₂)·4H₂O. It is considered as the most important raw material for the tungsten industry. The majority of tungsten-based catalysts are derived from the reduction of APT.

Generally, hydrogen is used to reduce tungsten hexachloride to produce ultrafine tungsten powder. And this method is also known as tungsten hexachloride hydrogen reduction method to prepare ultrafine tungsten powder. It includes preparation of WCl6 and reduction of WCl6 into tungsten powder.

Tungsten carbide (WC) has excellent properties of high hardness, high strength, high rigidity, good wear resistance, and thermal conductivity. It has wide application files of tools in the metalworking, drilling, and mining industries under severe conditions of high-pressure, high-temperature, and corrosive environment. These mechanical properties is affected by the composition and microstructural parameters including the grain size. It is known that reduction of WC gives a significant improvement in the mechanical properties of the consolidated compacts. So, an efficient and useful production method of nanoscale WC powder is necessary.